CN102674477A - Method for co-production of superfine ferroferric oxide and aluminum oxide by red mud of Bayer process - Google Patents
Method for co-production of superfine ferroferric oxide and aluminum oxide by red mud of Bayer process Download PDFInfo
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- CN102674477A CN102674477A CN2012101645156A CN201210164515A CN102674477A CN 102674477 A CN102674477 A CN 102674477A CN 2012101645156 A CN2012101645156 A CN 2012101645156A CN 201210164515 A CN201210164515 A CN 201210164515A CN 102674477 A CN102674477 A CN 102674477A
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Abstract
The invention discloses a method for co-production of superfine ferroferric oxide and aluminum oxide by red mud of the Bayer process, comprising the following steps of: adding wet red mud after being dried and hydrochloric acid into a reactor to stir and filter, obtaining filter liquid 1 containing iron ions and aluminum ions; adding Na2SO3 and polyethylene glycol to the filter liquid 1, and then using NaOH to regulate the pH (Potential Of Hydrogen) of leaching liquid to 11.5-12.5; obtaining Fe3O4 deposition and filter liquid 3; washing Fe3O4 deposition by water and absolute ethyl alcohol, drying the deposition, and obtaining pure Fe3O4; after adding polyethylene glycol to the filter liquid 3, using hydrochloric acid to regulate the pH in order to enable the aluminum ions deposit in an aluminum hydroxide manner, and obtaining aluminum hydroxide deposition; and washing the aluminum hydroxide deposition by water and absolute ethyl alcohol, drying and calcining the deposition, and then obtaining Al2O3. The preparation method disclosed by the invention is suitable for various Bayer process red mud with different components, so that environment pollution and land occupation problem caused by the red mud of Bayer process can be solved, waste is changed into treasure, and simultaneously, alence component iron and aluminum in the red mud are used to prepare magnetic ferroferric oxide and aluminum oxide so as to improve the comprehensive utilization value of the red mud of the Bayer process.
Description
Technical field
The present invention relates to a kind of method of comprehensive utilization of Bayer process red mud, belong to the comprehensive utilization of environmental protection and industrial residue, be specifically related to a kind of Bayer process red mud co-production of ultrafine Z 250, method of alumina.
Background technology
Bayer process red mud is the solid waste of discharging in the alumina producing Bayer process process, because of its appearance color is gained the name with redness of the skin or complexion earth is similar.Red mud belongs to the highly basic waste residue, is a kind of serious alkaline pollution source, and one ton of aluminum oxide of every production approximately produces 0.8-1.5 ton red mud.China is alumina producing big country, produces 2,378 ten thousand tons in aluminum oxide in 2009, and nearly 3,000 ten thousand tons of the red mud that produces.China's red mud comprehensive utilization ratio is merely 4% at present, and the accumulation volume of cargo in storage reaches 200,000,000 tons.Along with the growth year by year of China's aluminum oxide output and the reduction gradually of bauxite grade, the contracts amount of red mud also will constantly increase, and expect 2015, and red mud accumulative total volume of cargo in storage will reach 3.5 hundred million tons.
The mineral composition of Bayer process red mud is comparatively complicated; And different and different with the raw ore mineral composition with leaching condition, staple has the hydrated alumina of rhombohedral iron ore (or pyrrhosiderite etc.), hydrated aluminum silicate (sodalite, kankrinite), calcium aluminosilicate hydrate, quartz, calcium titanate and a small amount of not stripping etc.Because the Bayer process red mud iron content is high; Corrosion-resistant is difficult to directly be used for building material industry, and Bayer process red mud basicity is high, output is big; Traditional store up, fill out processing mode such as sea and will water body, atmosphere, the soil of periphery be polluted, had a strong impact on the Sustainable development of aluminium industry.Therefore, the comprehensive recovery of Bayer process red mud has become the important topic that China's aluminum oxide industry is realized recycling economy and Sustainable development with utilization.
At present, the comprehensive utilization main path of Bayer process red mud has three aspects: (1) comprehensive treating process is used to produce the pig iron, aluminum oxide and cement, and this some countries that are utilized in of red mud have reached the pilot-plant test stage.(2) produce material of construction and stupalith, at the existing industrial practice of states such as Germany and Hungary.(3) replace bentonite to be used for the briquetting of blast furnace ironmaking raw material.These three kinds are utilized approach basically all is the application of traditional field, and the secondary valence value is low.Therefore; From the utilization of resources, prevent and remedy pollution, protect land resources and economic benefit aspect to take all factors into consideration, the best mode that addresses this problem is to be that raw material production aluminium, iron series higher pair is worth fine chemical product and extracts yttrium wherein with the red mud.
Summary of the invention
The object of the present invention is to provide a kind of Bayer process red mud co-production of ultrafine Z 250, method of alumina; The present invention is the ultra-fine Z 250 of feedstock production, ultra-fine alumina with the waste red mud residues; This method has made full use of the principal element of the iron in the red mud, aluminium, silicon, reduces the harm of red mud to environment to greatest extent.
For realizing the foregoing invention purpose, the present invention takes following technical scheme:
Bayer process red mud co-production of ultrafine Z 250, method of alumina may further comprise the steps:
1) lixiviate: behind the red mud drying that will wet, be 1g:3-5mL, dried red mud and 8-10 mol hydrochloric acid added in the reactor drum stir, and be heated to 80-100 ℃, be incubated 1-2 hour according to red mud weight and hydrochloric acid volume ratio;
2) filter: filtered while hot obtains containing iron ion, aluminum ions filtrating 1 and a residue;
3) ultra-fine Fe
3O
4Preparation:
After the iron concentration of adjustment filtrating 1 was 0.25mol/L, the iron concentration mol ratio was that the concentration of 1:1-1.5 is the reductive agent Na of 0.5mol/L in adding and the solution
2SO
3Solution and solution quality 15-20% surfactant polyethylene, pH of leaching solution is regulated to 11.5-12.5 with the NaOH of 2mol/L in the back, at 70-90 ℃ of stirring reaction 0.5-1.0 hour after-filtration, obtains Fe
3O
4The deposition and filtrate 3, Fe
3O
4Deposition obtains pure Fe through washing, organic solvent absolute ethanol washing after drying
3O
4, obtain water lotion 4 and organic solvent washing liquid 5 simultaneously;
4) ultra-fine Al
2O
3Preparation:
After in filtrating 3, adding the surfactant polyethylene of its quality 2-4%; Regulate its pH value with the hydrochloric acid of 2mol/L again; Aluminum ion is wherein precipitated with the white lake form; Obtain aluminum hydroxide precipitation and post precipitation liquid 6, aluminum hydroxide precipitation obtains Al through washing, organic solvent absolute ethanol washing, drying, calcining
2O
3, obtain water lotion 7 and organic solvent washing liquid 8 simultaneously.
Said step 2) a residue obtains washings 2 with the hot wash of 1-3 times of volume 80-100 ℃ of its quality; Regulate the acidity continued of washings 2 and return the lixiviate of step 1) process.
The processing of a residue of said step 1), active SiO in residue
2Content greater than 25% o'clock, soak SiO through alkali
2The preparation WHITE CARBON BLACK, the secondary residue that obtains is as titanium content during greater than 6g/t, recyclable TiO wherein
2
Described water lotion 4, post precipitation liquid 6 and water lotion 7 are regulated the acidity continued and are returned the lixiviate of step 1) process; Sodium-chlor enrichment in water lotion 4, post precipitation liquid 6 and water lotion 7 is to 20g/L; Water lotion 4, post precipitation liquid 6 and water lotion 7 are concentrated preparation sodium-chlor, and the solution behind the preparation sodium-chlor gets into step 1) process lixiviate or treating part discharging after adjusting pH with hydrochloric acid.
Described organic solvent washing liquid 5 and 8 mixes back preparation absolute ethyl alcohol, and the absolute ethyl alcohol that obtains is applied to Fe again
3O
4, Al
2O
3Washing process.
Described drying all adopts microwave drying.
Preparing method of the present invention adapts to the Bayer process red mud of various heterogeneities; Environmental pollution and land occupation problem that Bayer process red mud causes have been solved on the one hand; Turn waste into wealth on the other hand, utilize valuable constituent iron, aluminium, preparation magnetic ferroferric oxide, aluminum oxide in the red mud, improved the comprehensive utilization value of Bayer process red mud; And level of residue is few, the solution reusable edible.
The extraction yield of iron of the present invention, aluminium, recovery height obtain the high-quality Z 250 easily, and can combine with existing sophisticated preparation aluminum oxide, silicon oxide technology, for the comprehensive utilization new model that realizes red mud provides gordian technique.
At the ultra-fine Fe of preparation
3O
4, Al
2O
3In the process, tensio-active agent adopts polyoxyethylene glycol, but the amount that the two preparation process adds is distinguished Fe to some extent
3O
4The preparation process adds the 15-20% tensio-active agent, and tensio-active agent plays dispersion agent and protectant effect (preventing to generate red oxide of iron), and Al
2O
3Add the tensio-active agent of 2-4% in the preparation process, tensio-active agent only plays dispersion agent.Used organic solvent is an absolute ethyl alcohol during washing.
Embodiment
The red mud that the present invention adopts mainly consists of rhombohedral iron ore content 10%, pyrrhosiderite content 23%, gipsite content 17%, quartz content 36%, illite content 6%, Na through the X diffraction analysis
6(Al
6Si
6O
24)
2NaFxH
2O content 7%, other composition are 1%.
Embodiment 1:
1) lixiviate: behind the red mud drying that will wet, be 1g:5mL, dried red mud and 10 mol hydrochloric acid added in the reactor drum stir, and be heated to 80 ℃, be incubated 1 hour according to red mud weight and hydrochloric acid volume ratio;
2) filter: filtered while hot obtains containing iron ion, aluminum ions filtrating 1 and a residue;
A residue account for 70% through X diffraction analysis result for quartz, illite accounts for 3%, anatase octahedrite accounts for 1%, diasporite accounts for 7%, pyrrhosiderite and limonite account for 4%, diopside accounts for 2%, amorphous phase accounts for 10%.The content of rhombohedral iron ore and pyrrhosiderite drops to 4% by 33% in the red mud after acidleach, and most of rhombohedral iron ore and pyrrhosiderite are dissolved in the acid, and anatase octahedrite obtains enrichment in red mud s.t. process simultaneously, and content reaches 1%.
Residue obtains washings 2 with the hot wash of 100 ℃ of the volumes of 3 times of its quality; Regulate the acidity continued of washings 2 and return the lixiviate of step 1) process;
3) ultra-fine Fe
3O
4Preparation:
After the iron concentration of adjustment filtrating 1 was 0.25mol/L, the iron concentration mol ratio was that the concentration of 1:1 is the reductive agent Na of 0.5mol/L in adding and the solution
2SO
3Solution and solution quality 20% surfactant polyethylene, pH of leaching solution to 11.5 is regulated with the NaOH of 2mol/L in the back, at 0.5 hour after-filtration of 90 ℃ of stirring reactions, obtains Fe
3O
4The deposition and filtrate 3, Fe
3O
4Deposition obtains pure Fe with microwave drying behind washing, organic solvent absolute ethanol washing
3O
4, obtaining the pure Z 250 of particle diameter 1.78um, it is higher that this method obtains Fe 3 O purity, obtains water lotion 4 and organic solvent washing liquid 5 simultaneously;
4) ultra-fine Al
2O
3Preparation:
After in filtrating 3, adding the surfactant polyethylene of its quality 3%; Regulate its pH value with the hydrochloric acid of 2mol/L again; Aluminum ion is wherein precipitated with the white lake form; Obtain aluminum hydroxide precipitation and post precipitation liquid 6, aluminum hydroxide precipitation obtains the Al of particle diameter 6.4um through washing, organic solvent absolute ethanol washing, microwave drying, calcining
2O
3, obtain water lotion 7 and organic solvent washing liquid 8 simultaneously.
Wherein water lotion 4, post precipitation liquid 6 and water lotion 7 are regulated the acidity continued and are returned the lixiviate of step 1) process; Sodium-chlor enrichment in water lotion 4, post precipitation liquid 6 and water lotion 7 is to 20g/L; To water lotion 4, post precipitation liquid 6 and the water lotion 7 concentrated sodium-chlor that prepare, the lixiviate of entering step 1) process was perhaps arranged the processing back after the solution behind the preparation sodium-chlor was adjusted pH with hydrochloric acid.
Wherein organic solvent washing liquid 5 and 8 mixes back preparation absolute ethyl alcohol, and the absolute ethyl alcohol that obtains is applied to Fe again
3O
4, Al
2O
3Washing process.
Active SiO in the residue
2Content greater than 25% o'clock, soak SiO through alkali
2Preparation WHITE CARBON BLACK, the secondary residue that obtains are worked as titanium content and are reclaimed TiO wherein greater than 6g/t
2
Embodiment 2:
1) lixiviate: behind the red mud drying that will wet, be 1g:3mL, dried red mud and 9 mol hydrochloric acid added in the reactor drum stir, and be heated to 100 ℃, be incubated 2 hours according to red mud weight and hydrochloric acid volume ratio;
2) filter: filtered while hot obtains containing iron ion, aluminum ions filtrating 1 and a residue;
A residue is used 90 ℃ the hot wash of 1 times of its quality, obtains washings 2; Regulate the acidity continued of washings 2 and return the lixiviate of step 1) process;
3) ultra-fine Fe
3O
4Preparation:
After the iron concentration of adjustment filtrating 1 was 0.25mol/L, the iron concentration mol ratio was that the concentration of 1:1.3 is the reductive agent Na of 0.5mol/L in adding and the solution
2SO
3Solution and solution quality 15% surfactant polyethylene,
PH of leaching solution to 12 is regulated with the NaOH of 2mol/L in the back, at 1 hour after-filtration of 70 ℃ of stirring reactions, obtains Fe
3O
4The deposition and filtrate 3, Fe
3O
4Deposition obtains pure Fe with microwave drying behind washing, organic solvent absolute ethanol washing
3O
4, obtain water lotion 4 and organic solvent washing liquid 5 simultaneously;
4) ultra-fine Al
2O
3Preparation:
After in filtrating 3, adding the surfactant polyethylene of its quality 2%; Regulate its pH value with the hydrochloric acid of 2mol/L again; Aluminum ion is wherein precipitated with the white lake form; Obtain aluminum hydroxide precipitation and post precipitation liquid 6, aluminum hydroxide precipitation obtains Al through washing, organic solvent absolute ethanol washing, microwave drying, calcining
2O
3, obtain water lotion 7 and organic solvent washing liquid 8 simultaneously.
Wherein water lotion 4, post precipitation liquid 6 and water lotion 7 are regulated the acidity continued and are returned the lixiviate of step 1) process; Sodium-chlor enrichment in water lotion 4, post precipitation liquid 6 and water lotion 7 is to 20g/L; Water lotion 4, post precipitation liquid 6 and water lotion 7 are concentrated preparation sodium-chlor, and the solution behind the preparation sodium-chlor gets into the lixiviate of step 1) process after adjusting pH with hydrochloric acid.
Wherein organic solvent washing liquid 5 and 8 mixes back preparation absolute ethyl alcohol, and the absolute ethyl alcohol that obtains is applied to Fe again
3O
4, Al
2O
3Washing process.
Active SiO in the residue
2Content greater than 25% o'clock, soak SiO through alkali
2Preparation WHITE CARBON BLACK, the secondary residue that obtains are worked as titanium content and are reclaimed TiO wherein greater than 6g/t
2
Embodiment 3:
1) lixiviate: behind the red mud drying that will wet, be 1g:4mL, dried red mud and 8 mol hydrochloric acid added in the reactor drum stir, and be heated to 90 ℃, be incubated 1.5 hours according to red mud weight and hydrochloric acid volume ratio;
2) filter: filtered while hot obtains containing iron ion, aluminum ions filtrating 1 and a residue;
A residue is used 80 ℃ the hot wash of 2 times of its quality, obtains washings 2; Regulate the acidity continued of washings 2 and return the lixiviate of step 1) process;
3) ultra-fine Fe
3O
4Preparation:
After the iron concentration of adjustment filtrating 1 was 0.25mol/L, the iron concentration mol ratio was that the concentration of 1:1.5 is the reductive agent Na of 0.5mol/L in adding and the solution
2SO
3Solution and solution quality 18% surfactant polyethylene,
PH of leaching solution to 12.5 is regulated with the NaOH of 2mol/L in the back, at 1 hour after-filtration of 80 ℃ of stirring reactions, obtains Fe
3O
4The deposition and filtrate 3, Fe
3O
4Deposition obtains pure Fe with microwave drying behind washing, organic solvent absolute ethanol washing
3O
4, obtain water lotion 4 and organic solvent washing liquid 5 simultaneously;
4) ultra-fine Al
2O
3Preparation:
After in filtrating 3, adding the surfactant polyethylene of its quality 4%; Regulate its pH value with the hydrochloric acid of 2mol/L again; Aluminum ion is wherein precipitated with the white lake form; Obtain aluminum hydroxide precipitation and post precipitation liquid 6, aluminum hydroxide precipitation obtains Al through washing, organic solvent absolute ethanol washing, microwave drying, calcining
2O
3, obtain water lotion 7 and organic solvent washing liquid 8 simultaneously.
Wherein water lotion 4, post precipitation liquid 6 and water lotion 7 are regulated the acidity continued and are returned the lixiviate of step 1) process; Sodium-chlor enrichment in water lotion 4, post precipitation liquid 6 and water lotion 7 is to 20g/L; Water lotion 4, post precipitation liquid 6 and water lotion 7 are concentrated preparation sodium-chlor, and the solution behind the preparation sodium-chlor gets into the lixiviate of step 1) process after adjusting pH with hydrochloric acid.
Wherein organic solvent washing liquid 5 and 8 mixes back preparation absolute ethyl alcohol, and the absolute ethyl alcohol that obtains is applied to Fe again
3O
4, Al
2O
3Washing process.
Active SiO in the residue
2Content greater than 25% o'clock, soak SiO through alkali
2Preparation WHITE CARBON BLACK, the secondary residue that obtains are worked as titanium content and are reclaimed TiO wherein greater than 6g/t
2
Claims (6)
1. Bayer process red mud co-production of ultrafine Z 250, method of alumina is characterized in that may further comprise the steps:
1) lixiviate: behind the red mud drying that will wet, be 1g:3-5mL, dried red mud and 8-10 mol hydrochloric acid added in the reactor drum stir, and be heated to 80-100 ℃, be incubated 1-2 hour according to red mud weight and hydrochloric acid volume ratio;
2) filter: filtered while hot obtains containing iron ion, aluminum ions filtrating 1 and a residue;
3) ultra-fine Fe
3O
4Preparation:
After the iron concentration of adjustment filtrating 1 was 0.25mol/L, the iron concentration mol ratio was that the concentration of 1:1-1.5 is the reductive agent Na of 0.5mol/L in adding and the solution
2SO
3Solution and solution quality 15-20% surfactant polyethylene, pH of leaching solution is regulated to 11.5-12.5 with the NaOH of 2mol/L in the back, at 70-90 ℃ of stirring reaction 0.5-1.0 hour after-filtration, obtains Fe
3O
4The deposition and filtrate 3, Fe
3O
4Deposition obtains pure Fe through washing, organic solvent absolute ethanol washing after drying
3O
4, obtain water lotion 4 and organic solvent washing liquid 5 simultaneously;
4) ultra-fine Al
2O
3Preparation:
After in filtrating 3, adding the surfactant polyethylene of its quality 2-4%; Regulate its pH value with the hydrochloric acid of 2mol/L again; Aluminum ion is wherein precipitated with the white lake form; Obtain aluminum hydroxide precipitation and post precipitation liquid 6, aluminum hydroxide precipitation obtains Al through washing, organic solvent absolute ethanol washing, drying, calcining
2O
3, obtain water lotion 7 and organic solvent washing liquid 8 simultaneously.
2. Bayer process red mud co-production of ultrafine Z 250 according to claim 1, method of alumina is characterized in that: a residue said step 2) obtains washings 2 with the hot wash of 1-3 times of volume 80-100 ℃ of its quality; Regulate the acidity continued of washings 2 and return the lixiviate of step 1) process.
3. Bayer process red mud co-production of ultrafine Z 250 according to claim 1, method of alumina is characterized in that: the processing of a residue of said step 1), active SiO in residue
2Content greater than 25% o'clock, soak SiO through alkali
2The preparation WHITE CARBON BLACK, the secondary residue that obtains is as titanium content during greater than 6g/t, recyclable TiO wherein
2
4. Bayer process red mud co-production of ultrafine Z 250 according to claim 1, method of alumina; It is characterized in that: described water lotion 4, post precipitation liquid 6 and water lotion 7 are regulated the acidity continued and are returned the lixiviate of step 1) process; Sodium-chlor enrichment in water lotion 4, post precipitation liquid 6 and water lotion 7 is to 20g/L; Water lotion 4, post precipitation liquid 6 and water lotion 7 are concentrated preparation sodium-chlor, and the solution behind the preparation sodium-chlor gets into step 1) process lixiviate or treating part discharging after adjusting pH with hydrochloric acid.
5. Bayer process red mud co-production of ultrafine Z 250 according to claim 1, method of alumina is characterized in that: described organic solvent washing liquid 5 and 8 mixes back preparation absolute ethyl alcohol, and the absolute ethyl alcohol that obtains is applied to Fe again
3O
4, Al
2O
3Washing process.
6. Bayer process red mud co-production of ultrafine Z 250 according to claim 1, method of alumina, it is characterized in that: described drying all adopts microwave drying.
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| CN105366971A (en) * | 2014-08-29 | 2016-03-02 | 北新集团建材股份有限公司 | Method for preparing radiation protection board |
| CN105439520A (en) * | 2014-08-29 | 2016-03-30 | 北新集团建材股份有限公司 | Method for producing radiation resisting plates |
| CN105801077A (en) * | 2016-02-17 | 2016-07-27 | 中国科学院地球化学研究所 | Preparation method of red mud/carbon-based magnetic composite material |
| CN106115794A (en) * | 2016-06-15 | 2016-11-16 | 天津市国润永泰环保科技有限公司 | A kind of method using industrial waste acid and red soil resource to produce ferroferric oxide magnetic powder |
| CN106315687A (en) * | 2016-08-03 | 2017-01-11 | 安徽八化工股份有限公司 | Method for preparing Fe3O4 from wastewater in chlorobenzene production |
| CN107475520A (en) * | 2017-08-11 | 2017-12-15 | 中国科学院过程工程研究所 | The separating technology of iron aluminium in a kind of red mud |
| CN108866318A (en) * | 2018-07-02 | 2018-11-23 | 深圳市中金环保科技有限公司 | A method of low-cost high-efficiency separates iron compound from red mud |
| CN109987641A (en) * | 2017-12-30 | 2019-07-09 | 天津友发钢管集团股份有限公司 | A kind of method that red soil prepares iron oxide black |
| CN110055400A (en) * | 2019-06-04 | 2019-07-26 | 长沙资生环保科技有限公司 | A kind of technique that step-by-step reduction realizes red mud higher value application |
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| CN105439520A (en) * | 2014-08-29 | 2016-03-30 | 北新集团建材股份有限公司 | Method for producing radiation resisting plates |
| CN105366971A (en) * | 2014-08-29 | 2016-03-02 | 北新集团建材股份有限公司 | Method for preparing radiation protection board |
| CN105366971B (en) * | 2014-08-29 | 2017-09-29 | 北新集团建材股份有限公司 | A kind of method for preparing radiation-proof plate |
| CN105801077A (en) * | 2016-02-17 | 2016-07-27 | 中国科学院地球化学研究所 | Preparation method of red mud/carbon-based magnetic composite material |
| CN106115794A (en) * | 2016-06-15 | 2016-11-16 | 天津市国润永泰环保科技有限公司 | A kind of method using industrial waste acid and red soil resource to produce ferroferric oxide magnetic powder |
| CN106115794B (en) * | 2016-06-15 | 2018-03-02 | 天津市国润永泰环保科技有限公司 | A kind of method that ferroferric oxide magnetic powder is produced using industrial waste acid and red soil recycling |
| CN106315687A (en) * | 2016-08-03 | 2017-01-11 | 安徽八化工股份有限公司 | Method for preparing Fe3O4 from wastewater in chlorobenzene production |
| CN106315687B (en) * | 2016-08-03 | 2018-10-09 | 安徽八一化工股份有限公司 | A kind of waste water with chlorobenzene production prepares Fe3O4Method |
| CN107475520A (en) * | 2017-08-11 | 2017-12-15 | 中国科学院过程工程研究所 | The separating technology of iron aluminium in a kind of red mud |
| CN109987641A (en) * | 2017-12-30 | 2019-07-09 | 天津友发钢管集团股份有限公司 | A kind of method that red soil prepares iron oxide black |
| CN108866318A (en) * | 2018-07-02 | 2018-11-23 | 深圳市中金环保科技有限公司 | A method of low-cost high-efficiency separates iron compound from red mud |
| CN110156029A (en) * | 2019-04-28 | 2019-08-23 | 于拴全 | Red mud Chemical Physics integrated conduct method |
| CN110055400A (en) * | 2019-06-04 | 2019-07-26 | 长沙资生环保科技有限公司 | A kind of technique that step-by-step reduction realizes red mud higher value application |
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Application publication date: 20120919 |