CN101070173A - Novel aluminium oxide extraction process from coal ash - Google Patents
Novel aluminium oxide extraction process from coal ash Download PDFInfo
- Publication number
- CN101070173A CN101070173A CN 200710110423 CN200710110423A CN101070173A CN 101070173 A CN101070173 A CN 101070173A CN 200710110423 CN200710110423 CN 200710110423 CN 200710110423 A CN200710110423 A CN 200710110423A CN 101070173 A CN101070173 A CN 101070173A
- Authority
- CN
- China
- Prior art keywords
- flyash
- sodium aluminate
- aluminate solution
- solid
- coal ash
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000010883 coal ash Substances 0.000 title claims description 14
- 238000000605 extraction Methods 0.000 title claims description 13
- 239000010881 fly ash Substances 0.000 claims abstract description 41
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 39
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 12
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 12
- 239000004571 lime Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000007885 magnetic separation Methods 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims abstract description 6
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 31
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 31
- 238000001914 filtration Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 239000012452 mother liquor Substances 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 16
- 239000011734 sodium Substances 0.000 claims description 14
- 239000011575 calcium Substances 0.000 claims description 12
- 229910052791 calcium Inorganic materials 0.000 claims description 12
- 239000008247 solid mixture Substances 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 239000013078 crystal Substances 0.000 claims description 10
- 239000006148 magnetic separator Substances 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 8
- 238000000354 decomposition reaction Methods 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000004570 mortar (masonry) Substances 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 230000003301 hydrolyzing effect Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract 1
- 239000011440 grout Substances 0.000 abstract 1
- 239000000284 extract Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000005649 metathesis reaction Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The invention offers a kind of craft which is used to distill alumina using fly ash, it mainly includes the following steps: dressing by magnetic separation for fly ash->mix fly ash white lime and sodium hydroxide solution->spray the mixed grout into rotary kiln of external heating using airbrush->hydrolyzing->filtration->desilication->filtration->decomposing->filtration->abstersion->calcination->alumina is formed. The advantages of craft which is used to distill alumina using fly ash in this invention are that the flow is simple, investment of equipment, energy consumption and production cost are low.
Description
Technical field
The present invention relates to the technology of the comprehensive utilization that becomes more meticulous of flyash, particularly a kind of is the novel process that raw material extracts aluminum oxide with flyash.
Background technology
Flyash is the waste in coal-burning power plant's power generation process, because there is the abundant in coal resource in China, power industry is based on the coal generating, continuous expansion along with power plant's scale, waste flyash quantity discharged is doubled and redoubled, not only taken a large amount of soils, but also existent environment of people has been caused severe contamination.At mainly containing AI in the flyash
2O
3, SiO
2, Fe
3O
4Characteristics, the comprehensive utilization flyash, allow flyash turn waste into wealth and have great importance.
Countries in the world are aspect total utilization of PCA: mainly be the AI that extracts in the flyash
2O
3, and extract that flyash is used for industrialized producing technology have only limestone sintering technology.Limestone sintering technology is with CaO: AI aspect proportioning raw materials
2O
3＞1, CaO: SiO
2〉=2 prepare burden, and make AI in CaO and the flyash under 1340～1450 ℃
2O
3Reaction generates calcium aluminate, and then adds Na
2CO
3Under the condition of solution, replacement(metathesis)reaction takes place generate sodium aluminate.Sodium aluminate generates product A I after through desiliconization, carbonization, decomposition supervisor
2O
3
The limestone sintering technology of prior art: owing under 1340～1450 ℃, carry out sintering reaction, aspect proportioning raw materials, allocated a large amount of Wingdales into, so, unfavorable factor such as the level of residue that have the technical process complexity comparatively speaking, facility investment is big, energy consumption is high, production cost is high, produces is big.
Content of the present invention
The objective of the invention is to overcome the defective of above-mentioned prior art, provide a kind of novel powdered coal ash to extract the technology of aluminum oxide, this technological operation is simple, and cost is low, and is pollution-free, and the alumina extraction ratio height is safe and energy-conservation.
The objective of the invention is to realize that by following technical proposals novel aluminium oxide extraction process from coal ash provided by the present invention comprises the steps:
1) flyash is joined in the magnetic separator, go out black product Fe by the magnetic separation separation and Extraction
3O
4Do not contain Fe
3O
4Flyash;
2) flyash and white lime, sodium hydroxide solution after separating by magnetic separator are prepared burden;
3) flyash, white lime, sodium hydroxide solution are joined in the whipping appts, under uncovered, room temperature, stir;
4) mortar after mixing is sprayed onto in the outer heating rotary kiln with spray gun, moves 20～30 minutes down at 460 ℃-500 ℃;
5) in outer heating rotary kiln, move the solid mixture of coming out, directly enter in the hydrolytic agitator of forming by silico-calcium wash heat liquid or aluminum hydroxide wash liquor, be hydrolyzed, also add 3-6%Na simultaneously
2CO
3, the whipping appts rotating speed is controlled at 〉=120 rev/mins of scopes in, stirred 30～40 minutes the solid mixture that obtains crude sodium aluminate solution after filtering and form by the silico-calcium slag at normal pressure, under temperature;
6) crude sodium aluminate solution is joined in the desilication device, in crude sodium aluminate solution, add 1-3 gram/LCa (OH)
2, the whipping appts rotating speed is controlled at 90～110 rev/mins, and the crude sodium aluminate solution temperature is controlled in 85 ℃～95 ℃ the scope and carries out atmospheric silicon removing, stops after 2～3 hours stirring, and obtains Na after filtering
2O: AI
2O
3Mol ratio MR=1.45～1.65, the sodium aluminate solution of siliceous modulus A/S＞250 and 3CaO.AI
2O
3.xSiO
2.yH
2The solid of O;
7) sodium aluminate solution after the desiliconization is carried out the essence filter by leaf filter, the sodium aluminate solution after the smart filter enters in the crystal decomposer, decomposes under the condition of adding crystal seed, obtains solid AI (OH) after the decomposition
3And circulating mother liquor;
8) by the mixture after decomposing after filtration, obtain solid AI (OH)
3And circulating mother liquor, solid AI (OH)
3After through washing, calcination procedure, can obtain product A I (OH)
3And AI
2O
3The 2nd) batching described in the step is performed such: flyash and white lime, sodium hydroxide solution after magnetic separator separates are pressed Na
2O: AI
2O
3Mol ratio MR=1.26, CaO: SiO
2=1.86 prepare burden.
After washing and other routine processes, can be made into cement and other product at the silico-calcium slag solid mixture described in above-mentioned the 5th step.
The above-mentioned the 7th) circulating mother liquor that obtained in the step can be the 2nd after concentrating) use of preparing burden in the step.
Novel powdered coal ash of the present invention extracts process for making alumina and compares with limestone sintering technology: aspect proportioning raw materials, the amount of allocating into of CaO has only CaO: SiO
2〉=2, and with flyash in AI
2O
3Reacting is Na
2O rather than CaO.So the residue that produces can reduce half.Aspect temperature of reaction, it is under 480 ℃ ± 20 ℃ condition that the novel powdered coal ash extracts process for making alumina, AI in the flyash
2O
3Reaction generates sodium aluminate with NaOH.Therefore the novel powdered coal ash extracts process for making alumina comparatively speaking, has characteristics such as technical process is simple, facility investment is little, energy consumption is low, production cost is low.
Below just relevant technology contents of the present invention and detailed description, existing conjunction with figs. and given embodiment describe as follows.
Description of drawings
Fig. 1 is an aluminium oxide extraction process from coal ash schema of the present invention.
Embodiment
Referring to accompanying drawing, aluminium oxide extraction process from coal ash provided by the present invention mainly comprises the steps: the prepare burden stirring → mortar after mixing is sprayed onto in the outer heating rotary kiln → hydrolysis → filtration → desiliconization → filtration → decomposition → filtration → washing → calcining → formation aluminum oxide with spray gun of flyash magnetic separation → flyash and white lime, sodium hydroxide solution.
Embodiment 1
In one embodiment, the flyash of employing is composed as follows:
| AI 2O 3 | SiO 2 | Fe 3O 4 | CaO | SO 3 | MgO | MnO | TiO 2 |
| 36.18 | 45.68 | 10.44 | 3.17 | 0.58 | 0.84 | 0.084 | 1.14 |
The following step of aluminium oxide extraction process from coal ash provided by the present invention:
1 directly joins flyash (must not pulverize) in the magnetic separator, separates to extract black product Fe by magnetic separation
3O
4And flyash;
2 flyash and white lime, sodium hydroxide solutions after separating by magnetic separator are pressed Na
2O: AI
2O
3Mol ratio MR=1.26, CaO: SiO
2=1.86 prepare burden;
3 flyash, white lime, sodium hydroxide solutions join in the whipping appts of being made by plain carbon stool, stir 10～20min under uncovered, room temperature;
4 mortar after mixing are sprayed onto in the outer heating rotary kiln with spray gun, at 480 ℃ ± 20 ℃ operation 20～30min down;
5 move the solid mixture of coming out in outer heating rotary kiln, directly enter in the hydrolytic agitator of being made up of silico-calcium wash heat liquid or aluminum hydroxide wash liquor, also add 5%Na simultaneously
2CO
3, the whipping appts rotating speed is controlled at 〉=the 120r/min scope in, at normal pressure, under temperature, stir 30min～40min, the solid mixture that obtains crude sodium aluminate solution after filtering and form by the silico-calcium slag.Silico-calcium slag solid mixture can be made into cement and other product after washing and other routine processes;
6 crude sodium aluminate solution join in the desilication device, add 2g/LCa (OH) in crude sodium aluminate solution
2, the whipping appts rotating speed is controlled at 90～110r/min, and the crude sodium aluminate solution temperature is controlled in 85 ℃～95 ℃ the scope and carries out atmospheric silicon removing, stops behind 2～3h stirring, and obtains Na after filtering
2O: AI
2O
3Mol ratio MR=1.50～1.56, the sodium aluminate solution of siliceous modulus A/S＞250 and 3CaO.AI
2O
3.xSiO
2.yH
2The solid of O, 3CaO.AI
2O
3.xSiO
2.yH
2O can be at replaced C a (OH) in the next time circulation
2Do crystal seed and carry out desiliconization;
Sodium aluminate solution after 7 desiliconizations carries out the essence filter by leaf filter, and the sodium aluminate solution after the smart filter enters in the crystal decomposer, decomposes under the condition of adding crystal seed, obtains solid AI (OH) after the decomposition
3And circulating mother liquor;
8 by the mixture after decomposing after filtration, obtains solid AI (OH)
3And circulating mother liquor, solid AI (OH)
3After through washing, calcination procedure, can obtain product A I (OH)
3And AI
2O
3
9 by analyzing product, the product A I that produces
2O
3Reach country-level standard.AI in the flyash
2O
3The actual extracting rate reaches 86～92%;
The circulating mother liquor that obtains after 10 filtrations is delivered in the multi-effect evaporating device and is concentrated, and circulating mother liquor concentration is increased, and the circulating mother liquor after concentrated returns the 1st program and flyash is proceeded mix stripping next batch product.
Embodiment 2
The flyash that adopts is composed as follows:
| AI 2O 3 | SiO 2 | Fe 3O 4 | CaO | SO 3 | MgO | MnO | TiO 2 |
| 37.10 | 4.98 | 16.41 | 3.07 | 0.63 | 0.81 | 0.091 | 1.10 |
Implementation step is as follows:
1 directly joins flyash (must not pulverize) in the magnetic separator, separates to extract black product Fe by magnetic separation
3O
4And flyash;
2 flyash and white lime, sodium hydroxide solutions after separating by magnetic separator are pressed Na
2O: AI
2O
3Mol ratio MR=1.26, CaO: SiO
2=1.86 prepare burden;
3 flyash, white lime, sodium hydroxide solutions join in the whipping appts of being made by plain carbon stool, stir 10～20min under uncovered, room temperature;
4 mortar after mixing are sprayed onto in the outer heating rotary kiln with spray gun, at 480 ℃ ± 20 ℃ operation 20～30min down;
5 move the solid mixture of coming out in outer heating rotary kiln, directly enter in the hydrolytic agitator of being made up of silico-calcium wash heat liquid or aluminum hydroxide wash liquor, also add 5%Na simultaneously
2CO
3The whipping appts rotating speed is controlled at 〉=the 120r/min scope in, at normal pressure, under temperature, stir 30min～40min, the solid mixture that obtains crude sodium aluminate solution after filtering and form by the silico-calcium slag, silico-calcium slag solid mixture can be made into cement and other product after washing and other routine processes;
6 crude sodium aluminate solution join in the desilication device, add 2g/LCa (OH) in crude sodium aluminate solution
2, the whipping appts rotating speed is controlled at 90～110r/min, and the crude sodium aluminate solution temperature is controlled in 85 ℃～95 ℃ the scope and carries out atmospheric silicon removing.Stop behind 2～3h stirring, obtain Na after filtering
2O: AI
2O
3Mol ratio MR=1.50～1.56, the sodium aluminate solution of siliceous modulus A/S＞250 and 3CaO.AI
2O
3.xSiO
2.yH
2The solid of O, 3CaO.AI
2O
3.xSiO
2.yH
2O can be at replaced C a (OH) in the next time circulation
2Do crystal seed and carry out desiliconization;
Sodium aluminate solution after 7 desiliconizations carries out the essence filter by leaf filter, and the sodium aluminate solution after the smart filter enters in the crystal decomposer, decomposes under the condition of adding crystal seed, obtains solid AI (OH) after the decomposition
3And circulating mother liquor;
8 by the mixture after decomposing after filtration, obtains solid AI (OH)
3And circulating mother liquor, solid AI (OH)
3After through washing, calcination procedure, can obtain product A I (OH)
3And AI
2O
3
9 by analyzing product, the product A I that produces
2O
3Reach country-level standard.AI in the flyash
2O
3The actual extracting rate reaches 86～92%;
The circulating mother liquor that obtains after 10 filtrations is delivered in the multi-effect evaporating device and is concentrated, and circulating mother liquor concentration is increased, and the circulating mother liquor after concentrated returns the 1st program and flyash is proceeded mix stripping next batch product.
The above then is specific embodiments of the invention and the technique means used, can derive according to the exposure of this paper or instruction and to derive many changes and correction, if the equivalence of having done according to conception of the present invention changes, when the effect that it produced does not exceed specification sheets and the graphic connotation of containing yet, all should be considered as within technology category of the present invention.
Claims (4)
1. a novel aluminium oxide extraction process from coal ash is characterized in that its technology comprises the steps:
1) flyash is joined in the magnetic separator, go out black product Fe by the magnetic separation separation and Extraction
3O
4Do not contain Fe
3O
4Flyash;
2) flyash and white lime, sodium hydroxide solution after separating by magnetic separator are prepared burden;
3) flyash, white lime, sodium hydroxide solution are joined in the whipping appts, under uncovered, room temperature, stir;
4) mortar after mixing is sprayed onto in the outer heating rotary kiln with spray gun, moves 20～30 minutes down at 460 ℃-500 ℃;
5) in outer heating rotary kiln, move the solid mixture of coming out, directly enter in the hydrolytic agitator of forming by silico-calcium wash heat liquid or aluminum hydroxide wash liquor, be hydrolyzed, also add 3-6%Na simultaneously
2CO
3, the whipping appts rotating speed is controlled at 〉=120 rev/mins of scopes in, stirred 30～40 minutes the solid mixture that obtains crude sodium aluminate solution after filtering and form by the silico-calcium slag at normal pressure, under temperature;
6) crude sodium aluminate solution is joined in the desilication device, in crude sodium aluminate solution, add 1-3 gram/LCa (OH)
2, the whipping appts rotating speed is controlled at 90～110 rev/mins, and the crude sodium aluminate solution temperature is controlled in 85 ℃～95 ℃ the scope and carries out atmospheric silicon removing, stops after 2～3 hours stirring, and obtains Na after filtering
2O: AI
2O
3Mol ratio MR=1.45～1.65, the sodium aluminate solution of siliceous modulus A/S＞250 and 3CaO.AI
2O
3.xSiO
2.yH
2The solid of O;
7) sodium aluminate solution after the desiliconization is carried out the essence filter by leaf filter, the sodium aluminate solution after the smart filter enters in the crystal decomposer, decomposes under the condition of adding crystal seed, obtains solid AI (OH) after the decomposition
3And circulating mother liquor;
8) by the mixture after decomposing after filtration, obtain solid AI (OH)
3And circulating mother liquor, solid AI (OH)
3After through washing, calcination procedure, can obtain product A I (OH)
3And AI
2O
3
2. novel aluminium oxide extraction process from coal ash according to claim 1 is characterized in that the 2nd) batching described in the step is performed such: flyash and white lime, sodium hydroxide solution after magnetic separator separates are pressed Na
2O: AI
2O
3Mol ratio MR=1.26, CaO: SiO
2=1.86 prepare burden.
3. novel aluminium oxide extraction process from coal ash according to claim 1, it is characterized in that the silico-calcium slag solid mixture described in above-mentioned the 5th step through the washing and other routine processes after, can be made into cement and other product.
4. novel aluminium oxide extraction process from coal ash according to claim 1 is characterized in that the above-mentioned the 7th) circulating mother liquor that obtained in the step can be the 2nd after concentrating) use of preparing burden in the step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710110423 CN101070173B (en) | 2007-06-06 | 2007-06-06 | Process for aluminium oxide extract from coal ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710110423 CN101070173B (en) | 2007-06-06 | 2007-06-06 | Process for aluminium oxide extract from coal ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101070173A true CN101070173A (en) | 2007-11-14 |
| CN101070173B CN101070173B (en) | 2012-12-19 |
Family
ID=38897615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710110423 Expired - Fee Related CN101070173B (en) | 2007-06-06 | 2007-06-06 | Process for aluminium oxide extract from coal ash |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101070173B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112011101459T5 (en) | 2010-04-27 | 2013-03-07 | China Shenhua Energy Company Limited | A method of providing metallurgical grade aluminum using fluid bed ash |
| WO2013143335A1 (en) * | 2012-03-28 | 2013-10-03 | 中国铝业股份有限公司 | Method for extracting aluminium oxide in fly ash by alkaline process |
| CN110425870A (en) * | 2019-08-30 | 2019-11-08 | 贵州遵义金山磨料有限公司 | A kind of bauxite Brown Alundum calcining-desiliconization integration tunnel oven |
| CN110563011A (en) * | 2019-09-12 | 2019-12-13 | 西南能矿集团股份有限公司 | Desiliconization agent for preparing alumina and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4362703A (en) * | 1982-03-01 | 1982-12-07 | Iowa State University Research Foundation, Inc. | Process for preparing cryolite from fly ash |
| CN1015537B (en) * | 1987-12-04 | 1992-02-19 | 淮南发电总厂 | Extraction of alumina from fly ash while producing beta-C2S-cement method |
| CN1392109A (en) * | 2002-04-27 | 2003-01-22 | 内蒙古蒙西高新技术集团有限公司 | Process for coproducing electrisity, aluminium and cement by comprehesively using gangue |
| CN1278936C (en) * | 2003-05-14 | 2006-10-11 | 武思东 | Process of utilizing flyash to prepare alumina and co-produce cement clinker |
-
2007
- 2007-06-06 CN CN 200710110423 patent/CN101070173B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112011101459T5 (en) | 2010-04-27 | 2013-03-07 | China Shenhua Energy Company Limited | A method of providing metallurgical grade aluminum using fluid bed ash |
| US8568671B2 (en) | 2010-04-27 | 2013-10-29 | China Shenhua Energy Company Limited | Method for preparing metallurgical-grade alumina by using fluidized bed fly ash |
| WO2013143335A1 (en) * | 2012-03-28 | 2013-10-03 | 中国铝业股份有限公司 | Method for extracting aluminium oxide in fly ash by alkaline process |
| CN110425870A (en) * | 2019-08-30 | 2019-11-08 | 贵州遵义金山磨料有限公司 | A kind of bauxite Brown Alundum calcining-desiliconization integration tunnel oven |
| CN110563011A (en) * | 2019-09-12 | 2019-12-13 | 西南能矿集团股份有限公司 | Desiliconization agent for preparing alumina and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101070173B (en) | 2012-12-19 |
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