CN107285349A - A kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash - Google Patents
A kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash Download PDFInfo
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- CN107285349A CN107285349A CN201710611749.3A CN201710611749A CN107285349A CN 107285349 A CN107285349 A CN 107285349A CN 201710611749 A CN201710611749 A CN 201710611749A CN 107285349 A CN107285349 A CN 107285349A
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- aluminum oxide
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/20—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts
- C01F7/22—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts with halides or halogen acids
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Abstract
The invention discloses a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash, following steps are specifically included：Flyash is ground first and activated, then the flyash after activation and mixed in hydrochloric acid is stirred, filtering obtains dissolution fluid；Oxidizing agent solution is added into dissolution fluid, stirring obtains mixed liquor；Diluent is added after methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2 ethyl hexanols, n-amyl alcohol are mixed evenly, continues to stir, extract is made；Obtained mixed liquor and extract are mixed, extracted, isolated organic phase and aqueous phase；Stirring reaction under concentrated ammonia liquor, normal temperature is added into aqueous phase, is filtered, obtained precipitation is washed with deionized at 35 times, 80 DEG C and dried, and obtained powder is placed in Muffle kiln roasting, and aluminum oxide is made.The aluminum oxide high purity 99.9% that method disclosed by the invention is obtained, the dissolution rate of aluminum oxide is also effectively improved.
Description
Technical field：
The present invention relates to Non-ferrous Metallurgy field, it is specifically related to one kind and aluminum oxide is extracted by raw material of aluminous fly-ash
Method.
Background technology：
As flyash largely discharges in coal-burning power plant, the bulk deposition of flyash is caused, the discharge and accumulation of flyash are not
A large amount of soils are only occupied, and severe contamination is caused to soil, water resource and air, are constituted to the dual broken of ecological and environment
It is bad.And China is relatively low to the comprehensive utilization ratio of flyash, total utilization of PCA is the important class that China researchs and solves for many years
Topic.At present, flyash is applied building the multiple fields such as work, building, but pertains generally to low value-added, low technical content
Extensive style is utilized.However, as the demand of China's bauxite resource is continuously increased, alumina producing scale constantly expands, and bauxite disappears
Consumption increases year by year, and resource contradiction becomes increasingly conspicuous.And China many areas such as Middle-west Inner Mongolia and North of Shanxi and Ningxia stone
In the part coal resources in the area such as mouth mountain, alumina content is up to 40% in the flyash generated after being burnt through thermal power plant
~50%.Therefore, to complete the economic of country, society, strategy and the task of environmental demand, oxidation is extracted in exploitation from flyash
The technology of aluminium is significant.
The technique of aluminum oxide is extracted from flyash to be had a lot, but is mainly divided into two major classes：One class is for leaching with sour
Agent is taken to extract aluminum oxide, referred to as acid system from flyash；Another kind of is to extract aluminum oxide from flyash by leaching agent of alkali, is claimed
For alkaline process.From alumina extraction cost consideration, acidity extraction is more more economic and environment-friendly than alkalinity extraction, is mainly wrapped for acidity extraction
Include using sulfuric acid and hydrochloric acid to extract, aluminum oxide is comparatively extracted using hydrochloric acid leaching process, the leaching rate of aluminum oxide is higher.
Chinese patent (201210317226.5) discloses a kind of HCl treatment coal ash for manufacturing for the method for aluminum oxide, including
Following step：By flyash activating；By the flyash after activation and the mixed in hydrochloric acid of 15%~36% concentration, ratio is in hydrochloric acid
HCl and flyash in the mol ratio of aluminum oxide and iron oxide be 4~9, in mixed slurries feeding reactor, be heated to 90
DEG C~230 DEG C, reaction time 1h~8h；Separation of solid and liquid after reaction cooling, obtains aluminium chloride liquid and high white residue, be concentrated by evaporation or
Crystal aluminum chloride is obtained after drying；Crystal aluminum chloride decomposes and obtains thick γ-Al2O3 and hydrogen chloride gas；Thick γ-Al2O3 are through visiing
Ear method technique prepares metallurgical-grade aluminum oxide, and residue is high scum, can be used as iron-smelting raw material.The leaching rate of this method aluminum oxide reaches
To more than 85%；But not only technique is more complicated for the extracting method, and obtained aluminum oxide purity is relatively low, and cost is higher.
The content of the invention：
The purpose of the present invention is that aluminum oxide is extracted by raw material of aluminous fly-ash there is provided one kind in view of the shortcomings of the prior art
Method, aluminum oxide purity made from this method is high, it is easy to separate, and prepares that cost is low, and process conditions are gentle.
To achieve the above object, the present invention uses following technical scheme：
A kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash, comprises the following steps：
(1) flyash is ground, crosses 200 mesh sieves；
(2) flyash and mixed in hydrochloric acid after milled processed are stirred, are transferred in water heating kettle, at 120-200 DEG C
Stirring reaction 0.5-7h, after reaction terminates, reaction product is filtered, dissolution fluid is obtained；
(3) added into dissolution fluid under oxidizing agent solution, 500-800r/min speed of agitator and stir 20-50min, obtained
Mixed liquor；
(4) added after methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2-Ethylhexyl Alcohol, n-amyl alcohol being mixed evenly
Diluent, continues to stir, extract is made；
(5) mixed liquor obtained above and extract are mixed, extracted, isolated organic phase and aqueous phase；
(6) stirring reaction under concentrated ammonia liquor, normal temperature is added into aqueous phase, is filtered, 3-5 is washed with deionized in obtained precipitation
It is secondary, dried at 80 DEG C, obtained powder is placed in Muffle kiln roasting, aluminum oxide is made.
As the preferred of above-mentioned technical proposal, in step (2), the molar concentration of the hydrochloric acid is 1-1.5mol/L.
As the preferred of above-mentioned technical proposal, in step (2), the mass ratio of the flyash and hydrochloric acid is 1：(25.85-
26.08)。
As the preferred of above-mentioned technical proposal, in step (2), before extraction, concentrated hydrochloric acid is added into dissolution fluid so that hydrochloric acid
Concentration keeps 40-50g/L.
As the preferred of above-mentioned technical proposal, in step (3), the oxidizing agent solution is that sodium chlorate solution, dioxygen are water-soluble
One kind in liquid, liquor natrii hypochloritis, ammonium persulfate solution.
As the preferred of above-mentioned technical proposal, in step (4), the diluent is sulfonated kerosene.
As the preferred of above-mentioned technical proposal, in step (4), methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2- ethyls
Hexanol, n-amyl alcohol, the consumption of diluent are respectively in parts by weight：15-35 parts of methylisobutylketone, 35-70 parts of tributyl phosphate,
5-30 parts of n-octyl alcohol, 5-30 parts of 2-Ethylhexyl Alcohol, 1-5 parts of n-amyl alcohol, 0.5-20 parts of diluent.
As the preferred of above-mentioned technical proposal, in step (5), the volume ratio of the mixed liquor and extract is 1:1.
As the preferred of above-mentioned technical proposal, in step (5), the extraction conditions is 500r/min speeds of agitator, extraction
Time 30min.
As the preferred of above-mentioned technical proposal, the oxidizing agent solution is sodium chlorate solution.
The invention has the advantages that：
The present invention carries out processing to flyash using hydrochloric acid leaching process and extracts aluminum oxide, and reasonable adjusting leaching condition, makes
The leaching rate for obtaining aluminum oxide is up to 96.2, and in order to improve the purity of alumina product, the present invention is carried out at extraction to dissolution fluid
Reason, first with appropriate oxidant to dissolution fluid processing before extraction so that the ferrous iron in dissolution fluid is converted into ferric iron, and closes
Manage slective extraction liquid so that extraction process is easier to make for, the extract loading capacity that the present invention is used is big, selectivity is strong, has
Effect improves the purity of alumina product.
Embodiment：
In order to be better understood from the present invention, below by embodiment, the present invention is further described, and embodiment is served only for solution
The present invention is released, any restriction will not be constituted to the present invention.
Embodiment 1
A kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash, comprises the following steps：
(1) flyash is ground, crosses 200 mesh sieves；
(2) flyash and mixed in hydrochloric acid after milled processed are stirred, are transferred in water heating kettle, stirred at 120 DEG C
4h is reacted, after reaction terminates, reaction product is filtered, dissolution fluid is obtained；Wherein, the molar concentration of hydrochloric acid is 1mol/L；Fine coal
The mass ratio of ash and hydrochloric acid is 1：26.08；Before extraction, concentrated hydrochloric acid is added into dissolution fluid so that concentration of hydrochloric acid keeps 40g/L；
(3) added into dissolution fluid under oxidizing agent solution, 500r/min speed of agitator and stir 45min, obtain mixed liquor；
(4) added after methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2-Ethylhexyl Alcohol, n-amyl alcohol being mixed evenly
Diluent, continues to stir, extract is made；Wherein, each component consumption is respectively in parts by weight：15 parts of methylisobutylketone, phosphorus
Sour 35 parts of tributyl, 5 parts of n-octyl alcohol, 5 parts of 2-Ethylhexyl Alcohol, 1 part of n-amyl alcohol, 0.5 part of diluent；
(5) mixed liquor obtained above and extract are mixed, extracted, isolated organic phase and aqueous phase；
(6) stirring reaction under concentrated ammonia liquor, normal temperature is added into aqueous phase, is filtered, 3-5 is washed with deionized in obtained precipitation
It is secondary, dried at 80 DEG C, obtained powder is placed in Muffle kiln roasting, aluminum oxide is made.
After testing, obtained aluminum oxide purity is 99.8%, and the dissolution rate of the aluminum oxide of flyash is 95.6%.
Embodiment 2
A kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash, comprises the following steps：
(1) flyash is ground, crosses 200 mesh sieves；
(2) flyash and mixed in hydrochloric acid after milled processed are stirred, are transferred in water heating kettle, stirred at 200 DEG C
0.5h is reacted, after reaction terminates, reaction product is filtered, dissolution fluid is obtained；Wherein, the molar concentration of hydrochloric acid is 1.5mol/L；
The mass ratio of flyash and hydrochloric acid is 1：26.08；Before extraction, concentrated hydrochloric acid is added into dissolution fluid so that concentration of hydrochloric acid is kept
50g/L；
(3) added into dissolution fluid under oxidizing agent solution, 800r/min speed of agitator and stir 20min, obtain mixed liquor；
(4) added after methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2-Ethylhexyl Alcohol, n-amyl alcohol being mixed evenly
Diluent, continues to stir, extract is made；Wherein, each component consumption is respectively in parts by weight：35 parts of methylisobutylketone, phosphorus
Sour 70 parts of tributyl, 30 parts of n-octyl alcohol, 30 parts of 2-Ethylhexyl Alcohol, 5 parts of n-amyl alcohol, 20 parts of diluent；
(5) mixed liquor obtained above and extract are mixed, extracted, isolated organic phase and aqueous phase；
(6) stirring reaction under concentrated ammonia liquor, normal temperature is added into aqueous phase, is filtered, 3-5 is washed with deionized in obtained precipitation
It is secondary, dried at 80 DEG C, obtained powder is placed in Muffle kiln roasting, aluminum oxide is made.
After testing, obtained aluminum oxide purity is 99.9%, and the dissolution rate of the aluminum oxide of flyash is 95.8%.
Embodiment 3
A kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash, comprises the following steps：
(1) flyash is ground, crosses 200 mesh sieves；
(2) flyash and mixed in hydrochloric acid after milled processed are stirred, are transferred in water heating kettle, stirred at 140 DEG C
5h is reacted, after reaction terminates, reaction product is filtered, dissolution fluid is obtained；Wherein, the molar concentration of hydrochloric acid is 1.1mol/L；Powder
The mass ratio of coal ash and hydrochloric acid is 1：25.88；Before extraction, concentrated hydrochloric acid is added into dissolution fluid so that concentration of hydrochloric acid keeps 42g/
L；
(3) added into dissolution fluid under oxidizing agent solution, 600r/min speed of agitator and stir 40min, obtain mixed liquor；
(4) added after methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2-Ethylhexyl Alcohol, n-amyl alcohol being mixed evenly
Diluent, continues to stir, extract is made；Wherein, each component consumption is respectively in parts by weight：18 parts of methylisobutylketone, phosphorus
Sour 40 parts of tributyl, 10 parts of n-octyl alcohol, 10 parts of 2-Ethylhexyl Alcohol, 2 parts of n-amyl alcohol, 5 parts of diluent；
(5) mixed liquor obtained above and extract are mixed, extracted, isolated organic phase and aqueous phase；
(6) stirring reaction under concentrated ammonia liquor, normal temperature is added into aqueous phase, is filtered, 3-5 is washed with deionized in obtained precipitation
It is secondary, dried at 80 DEG C, obtained powder is placed in Muffle kiln roasting, aluminum oxide is made.
After testing, obtained aluminum oxide purity is 99.9%, and the dissolution rate of the aluminum oxide of flyash is 93.99%.
Embodiment 4
A kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash, comprises the following steps：
(1) flyash is ground, crosses 200 mesh sieves；
(2) flyash and mixed in hydrochloric acid after milled processed are stirred, are transferred in water heating kettle, stirred at 150 DEG C
5h is reacted, after reaction terminates, reaction product is filtered, dissolution fluid is obtained；Wherein, the molar concentration of hydrochloric acid is 1.2mol/L；Powder
The mass ratio of coal ash and hydrochloric acid is 1：25.93；Before extraction, concentrated hydrochloric acid is added into dissolution fluid so that concentration of hydrochloric acid keeps 44g/
L；
(3) added into dissolution fluid under oxidizing agent solution, 600r/min speed of agitator and stir 30min, obtain mixed liquor；
(4) added after methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2-Ethylhexyl Alcohol, n-amyl alcohol being mixed evenly
Diluent, continues to stir, extract is made；Wherein, each component consumption is respectively in parts by weight：22 parts of methylisobutylketone, phosphorus
Sour 50 parts of tributyl, 15 parts of n-octyl alcohol, 15 parts of 2-Ethylhexyl Alcohol, 3 parts of n-amyl alcohol, 8 parts of diluent；
(5) mixed liquor obtained above and extract are mixed, extracted, isolated organic phase and aqueous phase；
(6) stirring reaction under concentrated ammonia liquor, normal temperature is added into aqueous phase, is filtered, 3-5 is washed with deionized in obtained precipitation
It is secondary, dried at 80 DEG C, obtained powder is placed in Muffle kiln roasting, aluminum oxide is made.
After testing, obtained aluminum oxide purity is 99.8%, and the dissolution rate of the aluminum oxide of flyash is 96.1%.
Embodiment 5
A kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash, comprises the following steps：
(1) flyash is ground, crosses 200 mesh sieves；
(2) flyash and mixed in hydrochloric acid after milled processed are stirred, are transferred in water heating kettle, stirred at 160 DEG C
1h is reacted, after reaction terminates, reaction product is filtered, dissolution fluid is obtained；Wherein, the molar concentration of hydrochloric acid is 1.3mol/L；Powder
The mass ratio of coal ash and hydrochloric acid is 1：25.95；Before extraction, concentrated hydrochloric acid is added into dissolution fluid so that concentration of hydrochloric acid keeps 46g/
L；
(3) added into dissolution fluid under oxidizing agent solution, 700r/min speed of agitator and stir 40min, obtain mixed liquor；
(4) added after methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2-Ethylhexyl Alcohol, n-amyl alcohol being mixed evenly
Diluent, continues to stir, extract is made；Wherein, each component consumption is respectively in parts by weight：25 parts of methylisobutylketone, phosphorus
Sour 50 parts of tributyl, 20 parts of n-octyl alcohol, 20 parts of 2-Ethylhexyl Alcohol, 4 parts of n-amyl alcohol, 12 parts of diluent；
(5) mixed liquor obtained above and extract are mixed, extracted, isolated organic phase and aqueous phase；
(6) stirring reaction under concentrated ammonia liquor, normal temperature is added into aqueous phase, is filtered, 3-5 is washed with deionized in obtained precipitation
It is secondary, dried at 80 DEG C, obtained powder is placed in Muffle kiln roasting, aluminum oxide is made.
After testing, obtained aluminum oxide purity is 99.8%, and the dissolution rate of the aluminum oxide of flyash is 96.2%.
Embodiment 6
A kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash, comprises the following steps：
(1) flyash is ground, crosses 200 mesh sieves；
(2) flyash and mixed in hydrochloric acid after milled processed are stirred, are transferred in water heating kettle, stirred at 180 DEG C
2h is reacted, after reaction terminates, reaction product is filtered, dissolution fluid is obtained；Wherein, the molar concentration of hydrochloric acid is 1.4mol/L；Powder
The mass ratio of coal ash and hydrochloric acid is 1：25.99；Before extraction, concentrated hydrochloric acid is added into dissolution fluid so that concentration of hydrochloric acid keeps 48g/
L；
(3) added into dissolution fluid under oxidizing agent solution, 600r/min speed of agitator and stir 30min, obtain mixed liquor；
(4) added after methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2-Ethylhexyl Alcohol, n-amyl alcohol being mixed evenly
Diluent, continues to stir, extract is made；Wherein, each component consumption is respectively in parts by weight：31 parts of methylisobutylketone, phosphorus
Sour 60 parts of tributyl, 25 parts of n-octyl alcohol, 25 parts of 2-Ethylhexyl Alcohol, 4.5 parts of n-amyl alcohol, 17 parts of diluent；
(5) mixed liquor obtained above and extract are mixed, extracted, isolated organic phase and aqueous phase；
(6) stirring reaction under concentrated ammonia liquor, normal temperature is added into aqueous phase, is filtered, 3-5 is washed with deionized in obtained precipitation
It is secondary, dried at 80 DEG C, obtained powder is placed in Muffle kiln roasting, aluminum oxide is made.
After testing, obtained aluminum oxide purity is 99.9%, and the dissolution rate of the aluminum oxide of flyash is 95.8%.
Claims (10)
1. a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash, it is characterised in that comprise the following steps：
(1) flyash is ground, crosses 200 mesh sieves；
(2) flyash and mixed in hydrochloric acid after milled processed are stirred, are transferred in water heating kettle, stirred at 120-200 DEG C
0.5-7h is reacted, after reaction terminates, reaction product is filtered, dissolution fluid is obtained；
(3) added into dissolution fluid under oxidizing agent solution, 500-800r/min speed of agitator and stir 20-50min, mixed
Liquid；
(4) dilution is added after methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2-Ethylhexyl Alcohol, n-amyl alcohol being mixed evenly
Agent, continues to stir, extract is made；
(5) mixed liquor obtained above and extract are mixed, extracted, isolated organic phase and aqueous phase；
(6) stirring reaction under concentrated ammonia liquor, normal temperature is added into aqueous phase, is filtered, obtained precipitation is washed with deionized 3-5 times,
Dried at 80 DEG C, obtained powder is placed in Muffle kiln roasting, aluminum oxide is made.
2. a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash as claimed in claim 1, it is characterised in that：Step
(2) in, the molar concentration of the hydrochloric acid is 1-1.5mol/L.
3. a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash as claimed in claim 1, it is characterised in that：Step
(2) in, the mass ratio of the flyash and hydrochloric acid is 1：(25.85-26.08).
4. a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash as claimed in claim 1, it is characterised in that：Step
(2) in, before extraction, concentrated hydrochloric acid is added into dissolution fluid so that concentration of hydrochloric acid keeps 40-50g/L.
5. a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash as claimed in claim 1, it is characterised in that：Step
(3) in, the oxidizing agent solution is one in sodium chlorate solution, hydrogen peroxide solution, liquor natrii hypochloritis, ammonium persulfate solution
Kind.
6. a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash as claimed in claim 1, it is characterised in that：Step
(4) in, the diluent is sulfonated kerosene.
7. a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash as claimed in claim 1, it is characterised in that：Step
(4) in, methylisobutylketone, tributyl phosphate, n-octyl alcohol, 2-Ethylhexyl Alcohol, n-amyl alcohol, the consumption of diluent divide in parts by weight
It is not：15-35 parts of methylisobutylketone, 35-70 parts of tributyl phosphate, 5-30 parts of n-octyl alcohol, 5-30 parts of 2-Ethylhexyl Alcohol, n-amyl alcohol
1-5 parts, 0.5-20 parts of diluent.
8. a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash as claimed in claim 1, it is characterised in that：Step
(5) in, the volume ratio of the mixed liquor and extract is 1:1.
9. a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash as claimed in claim 1, it is characterised in that：Step
(5) in, the extraction conditions is 500r/min speeds of agitator, extraction time 30min.
10. a kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash as claimed in claim 5, it is characterised in that：Institute
Oxidizing agent solution is stated for sodium chlorate solution.
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| CN108557853A (en) * | 2018-05-14 | 2018-09-21 | 中纳电子科技连云港有限公司 | A kind of preparation method of high purity aluminium oxide |
| CN112299721A (en) * | 2020-10-30 | 2021-02-02 | 神华准能资源综合开发有限公司 | Method for preparing alumina and co-producing microcrystalline glass based on pulverized coal furnace fly ash and product |
| CN113233513A (en) * | 2021-03-10 | 2021-08-10 | 国家能源集团宁夏煤业有限责任公司 | Method for extracting metal elements from coal gasification ash |
| CN114368770A (en) * | 2022-02-23 | 2022-04-19 | 神华准能资源综合开发有限公司 | Method for recovering alumina from coal gangue |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108557853A (en) * | 2018-05-14 | 2018-09-21 | 中纳电子科技连云港有限公司 | A kind of preparation method of high purity aluminium oxide |
| CN112299721A (en) * | 2020-10-30 | 2021-02-02 | 神华准能资源综合开发有限公司 | Method for preparing alumina and co-producing microcrystalline glass based on pulverized coal furnace fly ash and product |
| CN113233513A (en) * | 2021-03-10 | 2021-08-10 | 国家能源集团宁夏煤业有限责任公司 | Method for extracting metal elements from coal gasification ash |
| CN114368770A (en) * | 2022-02-23 | 2022-04-19 | 神华准能资源综合开发有限公司 | Method for recovering alumina from coal gangue |
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Application publication date: 20171024 |