CN109046234A - A kind of atlapulgite processing technology - Google Patents
A kind of atlapulgite processing technology Download PDFInfo
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- CN109046234A CN109046234A CN201810999524.4A CN201810999524A CN109046234A CN 109046234 A CN109046234 A CN 109046234A CN 201810999524 A CN201810999524 A CN 201810999524A CN 109046234 A CN109046234 A CN 109046234A
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- Prior art keywords
- atlapulgite
- washing
- water
- depickling
- processing technology
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- 238000005516 engineering process Methods 0.000 title claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 15
- 239000012065 filter cake Substances 0.000 claims abstract description 15
- 230000018044 dehydration Effects 0.000 claims abstract description 14
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 14
- 230000004913 activation Effects 0.000 claims abstract description 13
- 238000007885 magnetic separation Methods 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims abstract description 13
- 238000000227 grinding Methods 0.000 claims abstract description 11
- 239000010808 liquid waste Substances 0.000 claims abstract description 11
- 239000001103 potassium chloride Substances 0.000 claims abstract description 11
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 7
- 238000007873 sieving Methods 0.000 claims abstract description 7
- 238000009413 insulation Methods 0.000 claims abstract description 6
- 239000012190 activator Substances 0.000 claims abstract description 5
- 239000000440 bentonite Substances 0.000 claims description 30
- 229910000278 bentonite Inorganic materials 0.000 claims description 30
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 30
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 11
- 239000000706 filtrate Substances 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 10
- 239000011780 sodium chloride Substances 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 235000013339 cereals Nutrition 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims description 5
- 235000013312 flour Nutrition 0.000 claims description 5
- 239000006148 magnetic separator Substances 0.000 claims description 5
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical group [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 3
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 3
- 235000011151 potassium sulphates Nutrition 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004042 decolorization Methods 0.000 abstract description 3
- 239000008237 rinsing water Substances 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 2
- 150000002505 iron Chemical class 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009102 absorption Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- -1 sulfuric acid activated bentonite Chemical class 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dispersion Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention discloses a kind of atlapulgite processing technologys, include the following steps: slurrying；Sieving；Activation: sieving slurry made from step is pumped into activation kettle, acid and activator are added into activation kettle, leads to steam heating stirring, after stirring, insulation reaction；Depickling；Washing: after first breaing up depickling filter cake obtained in step plus water carries out once washing, filter-press dehydration after once washing, it is broken up again and water and sylvite auxiliary agent progress secondary washing is added, the waste water that once washing and secondary washing generate, which is passed through in liquid waste processing pond, to be handled；Filters pressing；Drying；Grinding；Magnetic separation.Atlapulgite rinsing water amount is few in the present invention, and save enterprise uses water cost, and atlapulgite free acid content is low after rinsing, and the percent of decolourization and activity degree of middle atlapulgite are high, can be removed the iron class impurity in atlapulgite by magnetic separation.
Description
Technical field
The invention belongs to atlapulgite field more particularly to a kind of atlapulgite processing technologys.
Background technique
Atlapulgite is to handle using bentonite as raw material through inorganic acidifying or salt or other methods, then rinse through water, is dry
Manufactured adsorbent, appearance is off-white powder, odorless, tasteless, nontoxic, and absorption property is very strong, can adsorb coloring matter, organic
Substance, general atlapulgite are all to be made with sulfuric acid activated bentonite, but with sulfuric acid activated production atlapulgite when rinses
Water consumption is big, generates a large amount of waste water, increases wastewater treatment difficulty, increases the operating cost of enterprise.
Summary of the invention
It is an object of the invention to overcome problem above of the existing technology, a kind of atlapulgite processing technology is provided,
Atlapulgite need to only rinse twice in the present invention, and rinsing water amount is few, and wastewater flow rate is few, and waste discharge is easily processed, significantly
Save enterprise uses water cost.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme:
A kind of atlapulgite processing technology, includes the following steps:
(1) slurrying: by bentonite ore plus water through ball mill grinding at slurry, the mass ratio of bentonite ore and water is 2-3:4；
(2) it is sieved: slurry made from step (1) being filtered as sieve, grain is made in the bentonite for discarding bulky grain
Spend uniform bentonite slurry；
(3) it activates: step (2) sieving slurry obtained being pumped into activation kettle, acid and activator are added into activation kettle,
The temperature of reaction kettle is increased to 80-90 DEG C by logical steam, stirs 2-3 hours, after stirring, the temperature of reaction kettle is increased to
100-120 DEG C, insulation reaction 2-3 hours；
(4) depickling: filters pressing depickling is carried out by filter press after the activating solution that step (3) obtains is cooled to 50-60 DEG C, is obtained
To depickling filter cake and filtrate, filtrate, which is passed through in liquid waste processing pond, to be handled；
(5) wash: after first breaing up depickling filter cake obtained in step (4) plus water carries out once washing, once washing
After filter-press dehydration, then broken up and water and sylvite auxiliary agent is added carries out secondary washing, once washing and secondary washing generate
Waste water be passed through in liquid waste processing pond and handled；
(6) filters pressing: filter-press dehydration obtains atlapulgite wet feed after secondary washing；
(7) it dries: atlapulgite wet feed obtained in step (6) being put into dryer and is dried；
(8) atlapulgite dried in step (7) grinding: is ground by obtained atlapulgite powder by flour mill；
(9) product magnetic separation: is made after carrying out magnetic separation to the resulting powder of step (8) using magnetic separator.
Further, the sieve in the step (2) is the mine screen net of 200 mesh.
Further, the acid in the step (4) is hydrochloric acid, and activator is sodium chloride.
Further, the additive amount of the hydrochloric acid is the 60%-80% of bentonite stock quality, and the additive amount of sodium chloride is
The 8%-12% of bentonite stock quality.
Further, the sylvite auxiliary agent is one of potassium sulfate or potassium chloride.
Further, the additive amount of the sylvite auxiliary agent is the 0.4%-0.8% of filter cake material after once washing filters pressing.
The beneficial effects of the present invention are:
1, atlapulgite need to only rinse twice in the present invention, and rinsing water amount is few, and wastewater flow rate is few, and waste discharge is easy
Processing, enterprise is greatly saved uses water cost；
2, atlapulgite free acid content is far below atlapulgite free acid content in national standard after rinsing in the present invention,
Illustrate it is of the invention there is good wash effect, ensure that the quality of atlapulgite；
3, the percent of decolourization of atlapulgite and activity degree are high in the present invention, ensure that the performance of atlapulgite；
4, magnetic separation link is increased in the present invention, the iron class impurity in atlapulgite can be removed, further ensures work
The quality of property carclazyte.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is process flow chart of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
A kind of atlapulgite processing technology as shown in Figure 1, includes the following steps:
(1) slurrying: 2000kg water will be added in 1000kg bentonite ore through ball mill grinding into bentonite slurry；
(2) it is sieved: bentonite slurry being filtered with 200 mesh mine screen nets, granularity is made in the bentonite for discarding bulky grain
Uniform bentonite slurry；
(3) it activates: the 500kg bentonite slurry after sieving is pumped into activation kettle, 300kg hydrochloric acid is added into activation kettle
With 40kg sodium chloride, the temperature of reaction kettle is increased to 80 DEG C, is stirred 3 hours, after stirring, the temperature of reaction kettle is increased
To 100 DEG C, insulation reaction 3 hours；
(4) depickling: filters pressing depickling is carried out by filter press after the activating solution that step (3) obtains is cooled to 50 DEG C, is obtained
Depickling filter cake and filtrate, filtrate, which is passed through in liquid waste processing pond, to be handled；
(5) wash: after first breaing up depickling filter cake obtained in step (4) plus water carries out once washing, once washing
After filter-press dehydration, take the filter cake that filter-press dehydration obtains after 300kg once washing, then broken up be added water and
1.2kg potassium chloride carries out secondary washing, and the waste water that once washing and secondary washing generate is passed through in liquid waste processing pond
Reason；
(6) filters pressing: filter-press dehydration obtains atlapulgite wet feed after secondary washing；
(7) it dries: atlapulgite wet feed obtained in step (7) being put into dryer and is dried；
(8) atlapulgite dried in step (8) grinding: is ground by obtained atlapulgite powder by flour mill；
(9) product magnetic separation: is made after carrying out magnetic separation to the resulting powder of step (9) using magnetic separator；
(10) quality of product is measured.
Embodiment 2
A kind of atlapulgite processing technology as shown in Figure 1, includes the following steps:
(1) slurrying: 1600kg water will be added in 1000kg bentonite ore through ball mill grinding into bentonite slurry；
(2) it is sieved: bentonite slurry being filtered with 200 mesh mine screen nets, granularity is made in the bentonite for discarding bulky grain
Uniform bentonite slurry；
(3) it activates: the 500kg bentonite slurry after sieving is pumped into activation kettle, 350kg hydrochloric acid is added into activation kettle
With 50kg sodium chloride, the temperature of reaction kettle is increased to 85 DEG C, is stirred 2.5 hours, after stirring, by the temperature liter of reaction kettle
Height is to 110 DEG C, insulation reaction 2.5 hours；
(4) depickling: filters pressing depickling is carried out by filter press after the activating solution that step (3) obtains is cooled to 55 DEG C, is obtained
Depickling filter cake and filtrate, filtrate, which is passed through in liquid waste processing pond, to be handled；
(5) wash: after first breaing up depickling filter cake obtained in step (4) plus water carries out once washing, once washing
After filter-press dehydration, take the filter cake that filter-press dehydration obtains after 300kg once washing, then broken up be added water and
1.8kg potassium sulfate carries out secondary washing, and the waste water that once washing and secondary washing generate is passed through in liquid waste processing pond
Reason；
(6) filters pressing: filter-press dehydration obtains atlapulgite wet feed after secondary washing；
(7) it dries: atlapulgite wet feed obtained in step (7) being put into dryer and is dried；
(8) atlapulgite dried in step (8) grinding: is ground by obtained atlapulgite powder by flour mill；
(9) product magnetic separation: is made after carrying out magnetic separation to the resulting powder of step (9) using magnetic separator；
(10) quality of product is measured.
Embodiment 3
A kind of atlapulgite processing technology as shown in Figure 1, includes the following steps:
(1) slurrying: 1300kg water will be added in 1000kg bentonite ore through ball mill grinding into bentonite slurry；
(2) it is sieved: bentonite slurry being filtered with 200 mesh mine screen nets, granularity is made in the bentonite for discarding bulky grain
Uniform bentonite slurry；
(3) it activates: the 500kg bentonite slurry after sieving is pumped into activation kettle, 400kg hydrochloric acid is added into activation kettle
With 60kg sodium chloride, the temperature of reaction kettle is increased to 90 DEG C, is stirred 2 hours, after stirring, the temperature of reaction kettle is increased
To 120 DEG C, insulation reaction 2 hours；
(4) depickling: filters pressing depickling is carried out by filter press after the activating solution that step (3) obtains is cooled to 60 DEG C, is obtained
Depickling filter cake and filtrate, filtrate, which is passed through in liquid waste processing pond, to be handled；
(5) wash: after first breaing up depickling filter cake obtained in step (4) plus water carries out once washing, once washing
After filter-press dehydration, take the filter cake that filter-press dehydration obtains after 300kg once washing, then broken up be added water and
2.4kg potassium chloride carries out secondary washing, and the waste water that once washing and secondary washing generate is passed through in liquid waste processing pond
Reason；
(6) filters pressing: filter-press dehydration obtains atlapulgite wet feed after secondary washing；
(7) it dries: atlapulgite wet feed obtained in step (7) being put into dryer and is dried；
(8) atlapulgite dried in step (8) grinding: is ground by obtained atlapulgite powder by flour mill；
(9) product magnetic separation: is made after carrying out magnetic separation to the resulting powder of step (9) using magnetic separator；
(10) quality of product is measured.
The measurement result of three embodiments of the invention is as shown in table 1.
1 technique production gained atlapulgite product quality measurement result of table
The quality of the atlapulgite product in three embodiments meets national standard as can be seen from Table 1, wherein dissociating
Acid content is far below national standard, and the detection numerical value of percent of decolourization and activity degree is all higher, illustrates the atlapulgite in the present invention
With excellent performance.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.
Claims (6)
1. a kind of atlapulgite processing technology, it is characterised in that include the following steps:
(1) slurrying: by bentonite ore plus water through ball mill grinding at slurry, the mass ratio of bentonite ore and water is 2-3:4；
(2) it is sieved: slurry made from step (1) being filtered as sieve, the obtained granularity of bentonite for discarding bulky grain is equal
Even bentonite slurry；
(3) it activates: step (2) sieving slurry obtained being pumped into activation kettle, acid and activator are added into activation kettle, leads to and steams
The temperature of reaction kettle is increased to 80-90 DEG C by vapour, stirs 2-3 hours, after stirring, the temperature of reaction kettle is increased to 100-
120 DEG C, insulation reaction 2-3 hours；
(4) depickling: filters pressing depickling is carried out by filter press after the activating solution that step (3) obtains is cooled to 50-60 DEG C, is taken off
Acidleach cake and filtrate, filtrate, which is passed through in liquid waste processing pond, to be handled；
(5) wash: after first breaing up depickling filter cake obtained in step (4) plus water carries out once washing, and once washing terminates
Filter-press dehydration afterwards, then broken up and water and sylvite auxiliary agent progress secondary washing is added, once washing and secondary washing generate useless
Water is passed through in liquid waste processing pond and is handled；
(6) filters pressing: filter-press dehydration obtains atlapulgite wet feed after secondary washing；
(7) it dries: atlapulgite wet feed obtained in step (6) being put into dryer and is dried；
(8) atlapulgite dried in step (7) grinding: is ground by obtained atlapulgite powder by flour mill；
(9) product magnetic separation: is made after carrying out magnetic separation to the resulting powder of step (8) using magnetic separator.
2. a kind of atlapulgite processing technology according to claim 1, it is characterised in that: the sieve in the step (2)
For the mine screen net of 200 mesh.
3. a kind of atlapulgite processing technology according to claim 1, it is characterised in that: the acid in the step (4) is
Hydrochloric acid, activator are sodium chloride.
4. a kind of atlapulgite processing technology according to claim 3, it is characterised in that: the additive amount of the hydrochloric acid is swollen
Moisten the 60%-80% of native stock quality, the additive amount of sodium chloride is the 8%-12% of bentonite stock quality.
5. a kind of atlapulgite processing technology according to claim 1, it is characterised in that: the sylvite auxiliary agent is potassium sulfate
Or one of potassium chloride.
6. a kind of atlapulgite processing technology according to claim 1, it is characterised in that: the additive amount of the sylvite auxiliary agent
For the 0.4%-0.8% of filter cake material after once washing filters pressing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810999524.4A CN109046234A (en) | 2018-08-30 | 2018-08-30 | A kind of atlapulgite processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810999524.4A CN109046234A (en) | 2018-08-30 | 2018-08-30 | A kind of atlapulgite processing technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109046234A true CN109046234A (en) | 2018-12-21 |
Family
ID=64758664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810999524.4A Pending CN109046234A (en) | 2018-08-30 | 2018-08-30 | A kind of atlapulgite processing technology |
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| Country | Link |
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| CN (1) | CN109046234A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111634922A (en) * | 2020-05-18 | 2020-09-08 | 江苏森茂能源发展有限公司 | A kind of clay directional activation technology |
| CN118371183A (en) * | 2024-06-25 | 2024-07-23 | 黄山市白岳活性白土有限公司 | Activated production line for producing granular activated clay |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB497097A (en) * | 1937-06-16 | 1938-12-13 | Elmore Mckellar | Processes for activating bentonites |
| SU899466A1 (en) * | 1980-04-30 | 1982-01-23 | Предприятие П/Я Р-6767 | Method for activating bentonite clay |
| GB2346822B (en) * | 1999-02-18 | 2002-06-26 | Aquafine Corp | Continuous filament matrix for magnetic separator |
| CN105129810A (en) * | 2015-08-25 | 2015-12-09 | 广西田东锦盛化工有限公司 | Production technology of activated clay by hydrochloric acid method |
| CN106865560A (en) * | 2016-12-22 | 2017-06-20 | 芜湖恒杰膨润土科技有限公司 | A kind of sodium-ionized bentonite production technology |
-
2018
- 2018-08-30 CN CN201810999524.4A patent/CN109046234A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB497097A (en) * | 1937-06-16 | 1938-12-13 | Elmore Mckellar | Processes for activating bentonites |
| SU899466A1 (en) * | 1980-04-30 | 1982-01-23 | Предприятие П/Я Р-6767 | Method for activating bentonite clay |
| GB2346822B (en) * | 1999-02-18 | 2002-06-26 | Aquafine Corp | Continuous filament matrix for magnetic separator |
| CN105129810A (en) * | 2015-08-25 | 2015-12-09 | 广西田东锦盛化工有限公司 | Production technology of activated clay by hydrochloric acid method |
| CN106865560A (en) * | 2016-12-22 | 2017-06-20 | 芜湖恒杰膨润土科技有限公司 | A kind of sodium-ionized bentonite production technology |
Non-Patent Citations (1)
| Title |
|---|
| 张术根等: "活性白土湿法生产漂洗方法研究 ", 《化工矿物与加工》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111634922A (en) * | 2020-05-18 | 2020-09-08 | 江苏森茂能源发展有限公司 | A kind of clay directional activation technology |
| CN118371183A (en) * | 2024-06-25 | 2024-07-23 | 黄山市白岳活性白土有限公司 | Activated production line for producing granular activated clay |
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Application publication date: 20181221 |