CN110887947A - Environmental index method for rock after-alteration of divided land-leaching sandstone-type uranium ores - Google Patents
Environmental index method for rock after-alteration of divided land-leaching sandstone-type uranium ores Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 131
- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 67
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000007613 environmental effect Effects 0.000 title claims abstract description 26
- 238000002386 leaching Methods 0.000 title claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 64
- 238000004458 analytical method Methods 0.000 claims abstract description 54
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000011593 sulfur Substances 0.000 claims abstract description 31
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 31
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 28
- 230000008859 change Effects 0.000 claims abstract description 18
- 238000005260 corrosion Methods 0.000 claims abstract description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 7
- 239000011707 mineral Substances 0.000 claims abstract description 7
- 230000004075 alteration Effects 0.000 claims description 38
- 238000005553 drilling Methods 0.000 claims description 18
- 230000003647 oxidation Effects 0.000 claims description 15
- 238000007254 oxidation reaction Methods 0.000 claims description 15
- 239000012286 potassium permanganate Substances 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 12
- 238000011065 in-situ storage Methods 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 9
- 230000033558 biomineral tissue development Effects 0.000 claims description 8
- 206010054949 Metaplasia Diseases 0.000 claims description 7
- 239000003086 colorant Substances 0.000 claims description 7
- 230000015689 metaplastic ossification Effects 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 239000003550 marker Substances 0.000 claims description 6
- 230000035772 mutation Effects 0.000 claims description 6
- YALHCTUQSQRCSX-UHFFFAOYSA-N sulfane sulfuric acid Chemical compound S.OS(O)(=O)=O YALHCTUQSQRCSX-UHFFFAOYSA-N 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 4
- 238000002372 labelling Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 4
- 229910052683 pyrite Inorganic materials 0.000 claims description 4
- 239000011028 pyrite Substances 0.000 claims description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 3
- 238000009838 combustion analysis Methods 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000004442 gravimetric analysis Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 229910052705 radium Inorganic materials 0.000 claims description 3
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000004448 titration Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 2
- 238000009533 lab test Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 238000013316 zoning Methods 0.000 claims description 2
- 238000011160 research Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 5
- 230000033116 oxidation-reduction process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 208000000058 Anaplasia Diseases 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 1
- NWFNSTOSIVLCJA-UHFFFAOYSA-L copper;diacetate;hydrate Chemical compound O.[Cu+2].CC([O-])=O.CC([O-])=O NWFNSTOSIVLCJA-UHFFFAOYSA-L 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The invention relates to the technical field of mineral geological exploration, and particularly discloses an environmental index method for after-corrosion of divided placer-leaching type uranium ore rocks. The method comprises the following steps: 1. setting a rock environment index sample; 2. sampling in the field; 3. carrying out experimental analysis on the sample, sending the sample into a laboratory in time after sampling the sample, and carrying out rock specific potential determination on delta Eh and low-valent sulfur S2‑Analysis and organic carbon Cy analysis; 4. for experimental numberAnd (6) analyzing, sorting and utilizing. The method selects rock specific potential delta Eh and low-valence sulfur S which are less influenced by air2‑And 3 rock environment index analysis data such as organic carbon Cy and the like are combined and judged, the geochemical environment of the rock can be accurately judged, the strength of the after-growth change of the rock is determined, the research and judgment and the division of the zonation of the after-growth change zone of the rock of the ground dunite type uranium ore are realized, and the enrichment factors of uranium-bearing property and uranium are analyzed by combining quantitative gamma logging data, so that the uranium ore occurrence part can be accurately captured.
Description
Technical Field
The invention belongs to the technical field of mineral geological exploration, and particularly relates to an environmental index method for occurrence of corrosion after rock of a partitioned sandstone-leaching type uranium ore.
Background
Because the in-situ leaching sandstone type uranium ore has the advantages of economy, easy mining and environmental protection, the in-situ leaching sandstone type uranium ore becomes an important type of the world natural uranium supply market and is widely valued by countries in the world. The most key technology for searching the type of uranium ore is the rock geochemical environment index (hereinafter referred to as the "environment index") dividing technology for the strong and weak zonation of the in-situ leaching sandstone type uranium ore after rock erosion. By the technology, the mineralization part, namely an oxidation zone front line or an oxidation-reduction interface, can be quickly, accurately, practically and effectively defined, so that the mineralization rate and the hole distribution efficiency are improved.
The rock retrogradation of the in-situ leaching sandstone type uranium ore is an important ore finding mark and an ore forming condition for searching the type of uranium ore, and the root cause of the rock degeneration is the water-rock effect. After the basin cover layer is formed into rock, the infiltrated water from the supply area enters an in-situ sandstone type uranium deposit rock (mainly referring to a water-containing sandstone layer, and then a small amount of a local water-resisting interlayer and a top and bottom plate water-resisting layer are included, and the same is applied below) permeable layer, and in the process of transporting to the drainage area, ions and compounds are brought out, so that the material composition of the rock is changed greatly. The most intuitive expression of the change is the change of the rock color, the most direct quantifiable data change is the change of the rock environment index, and accordingly, the change of the rock change strength can be divided into the change zones.
According to the geochemical environmental signs of minerals of the underground water oxidation-reduction environment of the after-alteration of the in-situ leaching sandstone-type uranium ore rocks, the after-alteration of the in-situ leaching sandstone-type uranium ore rocks can be generally divided into the categories of after-alteration oxidation and after-alteration reduction 2. The metaplasia oxidation alteration can be further divided into diving oxidation alteration, interlayer oxidation alteration and diving-interlayer oxidation alteration 3 types; the metaplastic reductive alterations can be further divided into sulfide reductive alterations, latent reductive alterations (also called sulfide-free reductive alterations) and oil gas reductive alterations 3.
The sedimentary rock color is mainly controlled by the valence state and content of iron and the existence form, the rock oxidation-reduction property can be evaluated by the rock color and the content of the valence iron, but the color of the core just taken out from the core tube is greatly different from the color of the core after dehydration because the surface of ferrous mineral in the rock is easily oxidized when the core is exposed in the air, such as: pyrite and iron dolomite are covered with a layer of tawny iron hydroxide, molybdenum sulfide is covered with a layer of blue film-shaped blue molybdenum ore, copper sulfide is covered with verdigris and the like, and analysis data cannot accurately reflect the real rock environment.
Disclosure of Invention
The invention aims to provide an environmental index method for the occurrence of the change after the rock of a divided land-leaching sandstone-type uranium ore, which aims at the rocks of a uranium finding target layer, particularly ore-containing water-containing sandstone, which are adopted by drilling, solves the research, judgment and division of the zonation of the change after the rock of the land-leaching sandstone-type uranium ore, and analyzes enrichment factors of uranium content and uranium by combining quantitative gamma logging data, thereby achieving the purpose of accurately capturing the occurrence part of the uranium ore.
The technical scheme of the invention is as follows: an environmental index method for the rock after-alteration of a divided land-leaching sandstone-type uranium ore is characterized by comprising the following steps of: the method specifically comprises the following steps:
step 1, setting a rock environment index sample
Reasonably laying rock environment index samples according to the properties, stages and target tasks of the in-situ leaching sandstone uranium ore belt drilling evaluation or exploration project, the geological working status, the geological background and the mineralization condition, drawing a sampling design drawing, and explaining a sampling method, requirements and an executed rule;
step 2, field sampling is carried out
Step 3, carrying out experimental analysis on the sample
After sampling of the sample is completed, the sample is sent to a laboratory in time for rock specific potential determination, low-valence sulfur analysis and organic carbon analysis;
step 4, analyzing, sorting and utilizing experimental data
Classifying and counting data reported by sample analysis, quantifying a rock primary environment index background value, comparing the change condition of rock secondary alteration environment index, judging the type and period of the secondary alteration, finding out a mutation part between the rock with the most intense ore-controlling secondary oxidation alteration and the primary non-altered reduction rock, analyzing reduction factors for enriching uranium deposit, dividing secondary oxidation alteration zones, and providing reliable data basis for delineating the front line of an oxidation zone.
The step 1 specifically comprises:
step 1.1, establishing a sampling sample design principle;
on the basis of collecting and sorting the previous samples, classified sampling of the same region (or section), the same layer, the same sand body, the same lithology, the same color and the same environment is realized according to the rock after-corrosion change and ore finding conditions;
step 1.2, determining a sampling object;
the main object of definite sampling is to find a uranium target layer, the key point of the target layer is a sand body, the key point of the sand body is the anagenetic alteration sandstone, and the key point of the anagenetic alteration sandstone is the ore-bearing sandstone of a mutation part;
step 1.3, obtaining background data of a native rock environmental index sample of a uranium finding target layer;
step 1.4, determining sampling key points and determining a sampling mode;
step 1.5, select appropriate weight of sample for subsequent chemical analysis
Taking a rock core sample with the weight of more than 300g, and simultaneously analyzing or selectively analyzing the specific potential delta Eh and the low-valent sulfur S of the rock according to the geochemical type of the rock2-And organic carbon Cy.
The step 2 of field sampling specifically comprises the following steps:
2.1, selecting a sampling tool;
step 2.2, sampling a sample;
2.2.1, sampling samples after drilling is finished;
after drilling, the core is taken out from the core box and put on the spread canvas, the sampling position and the sample length are taken by tape measure by using a core splitting or block picking sampling mode, the mud skin is removed by a scraper, the core is split by a geological hammer or a manual core splitter as appropriate, half of the core is packed into a plastic bag for sealing, and the other half is put back to the core box.
And 2.2.2, selecting a sample with proper weight, and labeling the sample.
When the sample experiment analysis is carried out in the step 3, the sample is subjected to sample crushing analysis, the rock and ore sample is generally crushed to 0.25mm, the same sample is divided into two samples with the same primary sample and the secondary sample, the primary sample is analyzed, the secondary sample is retained, and rock specific potential determination, low-valence sulfur analysis and organic carbon analysis are carried out;
the specific rock potential measuring method comprises the following specific steps:
step 3.1, specific potential measurement is carried out on the sample
Step 3.1.1 preparation of Potassium permanganate solution
Preparing a potassium permanganate solution according to the proportion of 1L of distilled water, 10ml of 10% potassium hydroxide solution and 5g of potassium permanganate, and standing for 7-10 days;
step 3.1.2, measuring the specific potential △ Eh of the rock;
putting 10g of crushed sample into a beaker A, adding 100ml of prepared potassium permanganate solution, directly adding 100ml of prepared potassium permanganate solution into another empty beaker B, uniformly stirring, respectively measuring Eh samples and Eh empty values of the solutions in the two beakers every 1, 3, 5, 10 and 24 hours, reading 3-5 data each time, taking the average value as the result until the result is stable, and obtaining the rock specific potential △ Eh ═ EhSample (A)－EhAir conditionerWherein, EhSample (A)Eh value determined for a sample beaker; ehAir conditionerEh values determined for a no-sample beaker.
The step 1.3 of obtaining background data of the environmental index sample of the native rock of the uranium finding target layer comprises the following steps:
in each region or section, the geochemical types of the rock colors of primary rocks of a uranium target layer and secondary altered rocks are found out firstly, and then, corresponding samples are designed pertinently according to different types aiming at meeting the requirement of background value analysis, and the samples are designed comprehensively for drilling holes on a main section so as to facilitate contrastive analysis and consider other auxiliary sections and drilling holes with special geological phenomena.
The step 1.4 is to determine the sampling emphasis and the sampling mode as follows:
after the background data of the primary rock environment index sample of the uranium finding target layer is mastered, sampling is mainly put on the metaplasia rock, and the sampling is respectively carried out according to the metaplasia strength, the type and the zonation superimposed on the sand body of the uranium finding target layer, the mineralization position, the type, the grade and the like; the core of the ore section can be used as an environmental index sample in the uranium radium basic analysis sample as appropriate, and sampling is carried out in a split core mode; the post-alteration core was sampled in a block picking fashion.
The step 2.2.2 selects a sample with a proper weight, and the specific steps for labeling the sample are as follows:
weighing the weight of the sample by using an electronic scale, measuring the strength of the sample by using an β + gamma recorder, filling the sample into a label, wherein the sample cannot be mixed with rocks of different rock colors and geochemical types, and the characteristic minerals such as carbon dust, pyrite and the like seen by naked eyes and special geological phenomena need to be described and recorded in the label, perfecting the lithology, numbering and analysis item label contents of the sample in duplicate, wherein one part is reserved, the other part is put into a cloth sample bag together with the sample in the plastic bag, and the sample number is clearly written on the cloth sample bag by using a marker pen after the sample is sealed.
The sampling tool selected in the step 2.1 comprises canvas, a measuring tape, a scraper, a geological hammer, a manual core splitting device, a label, a plastic bag, an electronic scale, an β + gamma recorder, a cloth sample bag, a marker pen and the like.
In the step 2.2.1, the sample sampled after the drilling is finished must be cleared of the mud skin of the core, and the core impregnated with mud must not be taken absolutely.
The low-valent sulfur S is carried out in the step 32-The specific steps of analysis and organic carbon Cy analysis were:
step 3.2, carrying out low-valence sulfur analysis on the sample
Low sulfur S of the sample2-The sulfur-containing material is characterized by comprising (1) total sulfur- (natural sulfur + sulfate sulfur), wherein the total sulfur is obtained by gravimetric analysis, and the natural sulfur and the sulfate sulfur are obtained by combustion analysis;
step 3.3, carrying out organic carbon analysis on the sample
Organic carbon Cy ═ total carbon C of sampleGeneral assemblyInorganic carbon CIs free ofAnd can be obtained by non-aqueous titration analysis.
The invention has the following remarkable effects: the environmental index method for the after-corrosion change of the divided land-leaching sandstone type uranium ore rock selects the rock specific potential delta Eh and the low-valence sulfur S which are less influenced by air2-The method can accurately judge the geochemical environment of the rock by combining and judging 3 rock environment index analysis data such as organic carbon Cy and the like, determine the strength of the after-growth alteration of the rock, realize the research, judgment and division of the zonation of the after-growth alteration zone of the rock of the ground dunite type uranium ore, and analyze enrichment factors of uranium-bearing property and uranium by combining quantitative gamma logging data, so as to accurately capture the occurrence part of the uranium ore, and has the characteristics of rapidness, accuracy, convenience and easiness.
Detailed Description
An environmental index method for the occurrence of rock anaplasia of a divided placer-leaching type uranium ore specifically comprises the following steps:
step 1, setting a rock environment index sample
Reasonably laying rock environment index samples according to the properties, stages and target tasks of the in-situ leaching sandstone uranium ore belt drilling evaluation or exploration project, the geological working status, the geological background and the mineralization condition, drawing a sampling design drawing, and explaining a sampling method, requirements and an executed rule;
step 1.1, establishing a design principle of a sampling sample
On the basis of collecting and sorting the conventional samples, reasonably designing rock environment index samples according to the after-corrosion change and ore-finding conditions of the rock; in order to truly reflect the geochemical environment of the rock and accurately determine the oxidation-reduction degree of the rock, the uniformity and the representativeness of samples must be ensured, classified sampling of the same region (or region), the same layer, the same sand body, the same lithology, the same color and the same environment is realized, the quantity of various samples is moderate, and the requirement of statistics is met as a bottom line;
step 1.2, determining a sampling object;
the main object of definite sampling is to find a uranium target layer, the key point of the target layer is a sand body, the key point of the sand body is the anagenetic alteration sandstone, and the key point of the anagenetic alteration sandstone is the ore-bearing sandstone of a mutation part;
step 1.3, obtaining background data of environmental index samples of native rocks of uranium finding target layer
In each area (or section), firstly, the geochemical types of the rock colors of native rocks of a uranium target layer and rock colors of post-alteration rocks are found out, then corresponding samples are designed in a targeted manner according to different types and aiming at meeting the requirement of background value analysis, and drilling holes in a main section are designed comprehensively so as to facilitate comparative analysis and consider other auxiliary sections and drilling holes with special geological phenomena;
step 1.4, determining sampling emphasis and determining sampling mode
After the background data of the primary rock environment index sample of the uranium finding target layer is mastered, sampling is mainly put on the metaplasia rock, and the sampling is respectively carried out according to the metaplasia strength, the type and the zonation superimposed on the sand body of the uranium finding target layer, the mineralization position, the type, the grade and the like; the core of the ore section can be used as a rock environment index sample in a uranium radium basic analysis sample as appropriate, and sampling is carried out in a split core mode; sampling the subsequent alteration rock core in a block picking mode;
step 1.5, select appropriate weight of sample for subsequent chemical analysis
Taking a rock core sample with the weight of more than 300g, and simultaneously analyzing or selectively analyzing the specific potential delta Eh and the low-valent sulfur S of the rock according to the geochemical type of the rock color2-And organic carbon Cy;
step 2, field sampling is carried out
Step 2.1, selecting a sampling tool
Selecting sampling tools comprising canvas, a measuring tape, a scraper, a geological hammer, a manual core splitting device, a label, a plastic bag, an electronic scale, an β + gamma recorder, a cloth sample bag, a marker pen and the like;
step 2.2, sample taking
Step 2.2.1, sample taking after drilling completion
After drilling, taking out the sampled rock core from the core box, placing the rock core on spread canvas, taking a sampling position and a sampling length by a tape measure by using a core splitting or block picking sampling mode, removing mud skin by using a scraper, splitting by using a geological hammer or a manual core splitter as appropriate, filling half of the core into a plastic bag for sealing, and placing the other half back to the core box; wherein, the sampled sample must remove the mud skin of the core, and the core dipped by mud can not be adopted;
step 2.2.2, selecting samples with proper weight and marking the samples
Weighing the weight of the sample by using an electronic scale, measuring the strength of the sample by using an β + gamma recorder, filling the sample into a label, wherein the sample cannot be mixed with rocks of different rock colors and geochemical types, and the characteristic minerals such as carbon dust, pyrite and the like seen by naked eyes and special geological phenomena need to be described and recorded in the label, so that the lithology, numbering and label content of analysis items of the sample are perfected, one part is reserved, one part is put into a cloth sample bag together with the sample in the plastic bag, and the sample number is clearly written on the cloth sample bag by using a marker pen after the sample is sealed;
step 3, carrying out experimental analysis on the sample
After the sample is sampled, the sample is sent to a laboratory for analysis in time so as to reduce the time of the sample exposed in the air as much as possible, after the sample is received by the laboratory, the rock and ore sample is immediately crushed to phi 0.25mm, the same sample is divided into two samples with the same positive and negative, the positive sample is analyzed, the negative sample is retained, the rock specific potential △ Eh determination and the low-price sulfur S are carried out2-Analysis and organic carbon Cy analysis;
step 3.1, specific potential △ Eh determination is carried out on the sample
Step 3.1.1 preparation of Potassium permanganate solution
Preparing a potassium permanganate solution according to the proportion of 1L of distilled water, 10ml of 10% potassium hydroxide solution and 5g of potassium permanganate, and standing for 7-10 days until the solution is stable;
step 3.1.2, measuring the specific potential △ Eh of the rock;
putting 10g of crushed sample into a beaker A, adding 100ml of prepared potassium permanganate solution, directly adding 100ml of prepared potassium permanganate solution into another empty beaker B, uniformly stirring, respectively measuring Eh samples and Eh empty values of the solutions in the two beakers every 1, 3, 5, 10 and 24 hours, reading 3-5 data each time, taking the average value as the result until the result is stable, and obtaining the rock specific potential △ Eh ═ EhSample (A)－EhAir conditionerWherein, EhSample (A)Eh value determined for a sample beaker; ehAir conditionerEh value determined for a no-sample beaker;
step 3.2, carrying out low-valent sulfur S on the sample2-Analysis of
Low sulfur S of the sample2-The sulfur-containing material is characterized by comprising (1) total sulfur- (natural sulfur + sulfate sulfur), wherein the total sulfur is obtained by gravimetric analysis, and the natural sulfur and the sulfate sulfur are obtained by combustion analysis;
step 3.3, organic carbon Cy analysis of the sample
Organic carbon Cy ═ total carbon C of sampleGeneral assemblyInorganic carbon CIs free ofCan be obtained by non-aqueous titration analysis;
step 4, analyzing, sorting and utilizing laboratory test analysis data
After receiving a test analysis report given by a laboratory, carrying out classified statistics on data, quantifying a rock primary environment index background value, comparing the change condition of rock secondary alteration environment indexes, judging the type and the period of the secondary alteration, finding out a mutation part between the rock with the original non-altered reduction and the rock with strongest ore-controlling secondary oxidation alteration, analyzing reduction factors for enriching uranium precipitates, carrying out secondary oxidation alteration zoning and division, and providing a reliable data basis for delineating the front line of an oxidation zone.
Claims (10)
1. An environmental index method for the rock after-alteration of a divided land-leaching sandstone-type uranium ore is characterized by comprising the following steps of: the method specifically comprises the following steps:
step 1, setting a rock environment index sample
Reasonably laying rock environment index samples according to the properties, stages and target tasks of the in-situ leaching sandstone uranium ore belt drilling evaluation or exploration project, the geological working status, the geological background and the mineralization condition, drawing a sampling design drawing, and explaining a sampling method, requirements and an executed rule;
step 2, field sampling is carried out
Step 3, carrying out experimental analysis on the sample
After the sampling of the sample is finished, the sample is sent into a laboratory in time to carry out the specific potential △ Eh determination of the rock and the low-valence sulfur S2-Analysis and organic carbon Cy;
step 4, analyzing, sorting and utilizing laboratory test analysis data
After receiving a test analysis report given by a laboratory, carrying out classified statistics on data, quantifying a rock primary environment index background value, comparing the change condition of rock secondary alteration environment indexes, judging the type and the period of the secondary alteration, finding out a mutation part between the rock with the original non-altered reduction and the rock with strongest ore-controlling secondary oxidation alteration, analyzing reduction factors for enriching uranium precipitates, carrying out secondary oxidation alteration zoning and division, and providing a reliable data basis for delineating the front line of an oxidation zone.
2. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 1, wherein: the step 1 specifically comprises:
step 1.1, establishing a sampling sample design principle;
on the basis of collecting and sorting the previous samples, classified sampling of the same region (or section), the same layer, the same sand body, the same lithology, the same color and the same environment is realized according to the rock after-corrosion change and ore finding conditions;
step 1.2, determining a sampling object;
the main object of definite sampling is to find a uranium target layer, the key point of the target layer is a sand body, the key point of the sand body is the anagenetic alteration sandstone, and the key point of the anagenetic alteration sandstone is the ore-bearing sandstone of a mutation part;
step 1.3, obtaining background data of a native rock environmental index sample of a uranium finding target layer;
step 1.4, determining sampling key points and determining a sampling mode;
step 1.5, select appropriate weight of sample for subsequent chemical analysis
Taking a rock core sample with the weight of more than 300g, and simultaneously analyzing or selectively analyzing the specific potential delta Eh and the low-valent sulfur S of the rock according to the geochemical type of the rock2-And organic carbon Cy.
3. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 1, wherein: the step 2 of field sampling specifically comprises the following steps:
2.1, selecting a sampling tool;
step 2.2, sampling a sample;
2.2.1, sampling samples after drilling is finished;
after drilling, the core is taken out from the core box and put on the spread canvas, the sampling position and the sample length are taken by tape measure by using a core splitting or block picking sampling mode, the mud skin is removed by a scraper, the core is split by a geological hammer or a manual core splitter as appropriate, half of the core is packed into a plastic bag for sealing, and the other half is put back to the core box.
And 2.2.2, selecting a sample with proper weight, and labeling the sample.
4. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 1, wherein: when the sample experiment analysis is carried out in the step 3, the rock and ore sample is crushed to phi 0.25mm, the same sample is divided into two samples with the same positive and negative, the positive sample is analyzed, the negative sample is retained, and the rock specific potential determination, the low-valence sulfur analysis and the organic carbon analysis are carried out;
the specific rock potential measuring method comprises the following specific steps:
step 3.1, specific potential measurement is carried out on the sample
Step 3.1.1 preparation of Potassium permanganate solution
Preparing a potassium permanganate solution according to the proportion of 1L of distilled water, 10ml of 10% potassium hydroxide solution and 5g of potassium permanganate, and standing for 7-10 days until the solution is stable;
step 3.1.2, measuring the specific potential △ Eh of the rock;
putting 10g of crushed sample into a beaker A, adding 100ml of prepared potassium permanganate solution, directly adding 100ml of prepared potassium permanganate solution into another empty beaker B, uniformly stirring, respectively measuring Eh samples and Eh empty values of the solutions in the two beakers every 1, 3, 5, 10 and 24 hours, reading 3-5 data each time, taking the average value as the result until the result is stable, and obtaining the rock specific potential △ Eh ═ EhSample (A)－EhAir conditionerWherein, EhSample (A)Eh value determined for a sample beaker; ehAir conditionerEh values determined for a no-sample beaker.
5. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 2, wherein: the step 1.3 of obtaining background data of the environmental index sample of the native rock of the uranium finding target layer comprises the following steps:
in each region or section, the geochemical types of the rock colors of primary rocks of a uranium target layer and secondary altered rocks are found out firstly, and then, corresponding samples are designed pertinently according to different types aiming at meeting the requirement of background value analysis, and the samples are designed comprehensively for drilling holes on a main section so as to facilitate contrastive analysis and consider other auxiliary sections and drilling holes with special geological phenomena.
6. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 2, wherein: the step 1.4 is to determine the sampling emphasis and the sampling mode as follows:
after the background data of the primary rock environment index sample of the uranium finding target layer is mastered, sampling is mainly put on the metaplasia rock, and the sampling is respectively carried out according to the metaplasia strength, the type and the zonation superimposed on the sand body of the uranium finding target layer, the mineralization position, the type, the grade and the like; the core of the ore section can be used as a rock environment index sample in a uranium radium basic analysis sample as appropriate, and sampling is carried out in a split core mode; the post-alteration core was sampled in a block picking fashion.
7. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 3, wherein: the step 2.2.2 selects a sample with a proper weight, and the specific steps for labeling the sample are as follows:
weighing the weight of the sample by using an electronic scale, measuring the strength of the sample by using an β + gamma recorder, filling the sample into a label, wherein the sample cannot be mixed with rocks of different rock colors and geochemical types, and the characteristic minerals such as carbon dust, pyrite and the like seen by naked eyes and special geological phenomena need to be described and recorded in the label, perfecting the lithology, numbering and analysis item label contents of the sample in duplicate, wherein one part is reserved, the other part is put into a cloth sample bag together with the sample in the plastic bag, and the sample number is clearly written on the cloth sample bag by using a marker pen after the sample is sealed.
8. The environmental index method for the metaverse sandstone-type uranium ore rock after-corrosion according to claim 3, wherein the sampling tool selected in the step 2.1 comprises canvas, a measuring tape, a scraper, a geological hammer, a manual core splitter, a label, a plastic bag, an electronic scale, an β + gamma recorder, a cloth sample bag and a marker pen.
9. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 3, wherein: in the step 2.2.1, the sample sampled after the drilling is finished must be cleared of the mud skin of the core, and the core impregnated with mud cannot be adopted.
10. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 4, wherein: the low-valent sulfur S is carried out in the step 32-The specific steps of analysis and organic carbon Cy analysis were:
step 3.2, carrying out low-valent sulfur S on the sample2-Analysis of
Low sulfur S of the sample2-The sulfur-containing material is characterized by comprising (1) total sulfur- (natural sulfur + sulfate sulfur), wherein the total sulfur is obtained by gravimetric analysis, and the natural sulfur and the sulfate sulfur are obtained by combustion analysis;
step 3.3, organic carbon Cy analysis of the sample
Organic carbon Cy ═ total carbon C of sampleGeneral assemblyInorganic carbon CIs free ofAnd can be obtained by non-aqueous titration analysis.
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