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Method for producing alumina with aluminum-containing metallurgical material

An aluminum metallurgy and alumina technology, applied in the field of alumina production from aluminum-containing metallurgical materials, can solve the problems of weak market competitiveness and high alumina production cost, and achieve the effects of good product quality, fast decomposition speed and strong process adaptability.

Inactive Publication Date: 2010-10-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fly ash can be used to produce alumina, the production cost of alumina obtained by the existing process is high and the market competitiveness is weak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add sulfuric acid to 1000g of gibbsite according to 1.2 times the stoichiometric amount, liquid-solid ratio L / S 3: 1mL / g, stir at 95°C for 3 hours, filter; stir the crude aluminum sulfate solution and add sodium hydroxide to adjust the pH to 2.6, Purify at 85°C for 1 hour, filter; add sodium carbonate to the refined aluminum sulfate solution to neutralize to pH 5.5, stir at 95°C for 1 hour to precipitate aluminum hydroxide, filter and wash; calcinate aluminum hydroxide at 850°C for 2 hours to obtain Al with a purity of 99.1% 2 o 3 Product; the sodium sulfate filtrate obtained by sinking aluminum is added into ammonium bicarbonate according to 1.4 times of the stoichiometric number of sodium bicarbonate, stirred at 55°C for 1 hour, and filtered to obtain sodium bicarbonate and ammonium sulfate solution; the ammonium sulfate solution is used as anolyte, and 0.2mol / L sulfuric acid solution is used as the catholyte, and the catholyte and the anolyte are separated by an anio...

Embodiment 2

[0039] Contains Al 2 o 3 Add sulfuric acid to 2000g of 30% fly ash according to 1.4 times of the stoichiometric amount, stir, and roast at 250°C for 2 hours; split the calcined sand into two, liquid-solid ratio L / S 2:1mL / g, soak in water at 100°C for 1 hour, filter; the filtrate is cooled and crystallized, the mother liquor is used for the leaching of the next batch of calcined sand, and the aluminum sulfate crystals are dissolved by adding water and stirring at 100°C; hours, filtered and washed to obtain aluminum hydroxide and sodium sulfate solution; aluminum hydroxide was calcined at 1000°C for 2 hours to obtain Al with a purity of 99.6%. 2 o 3 Product: Add ammonium bicarbonate to the sodium sulfate filtrate according to 1.2 times the stoichiometric number of sodium bicarbonate formation, stir at 50°C for 1 hour, filter to obtain sodium bicarbonate and ammonium sulfate solution; ammonium sulfate solution is 1.1 times the stoichiometric number to form gypsum Add lime, sti...

Embodiment 3

[0041] Add 800g of boehmite to 1.1 times of the stoichiometric amount, add sulfuric acid and stir, and roast at 220°C for 1 hour; the liquid-solid ratio of calcined sand is L / S 4:1mL / g, soak in water at 90°C for 1 hour, filter; the filtrate is cooled Crystallization, the mother liquor is used for the leaching of the next batch of calcined sand, the aluminum sulfate crystals are dissolved by adding water and stirring at 95°C; the heavy aluminum sulfate solution is added to the sodium bicarbonate obtained in Example 2 to neutralize to pH 6.2, stirred at 85°C for 1 hour, filtered and washed to obtain hydrogen Alumina and sodium sulfate solution; calcining aluminum hydroxide at 950°C for 2 hours to obtain Al with a purity of 99.7% 2 o 3 Product; sodium bicarbonate filtrate is added into ammonium bicarbonate according to 1.2 times the stoichiometric number of sodium bicarbonate formation, stirred at 50°C for 1 hour, and filtered to obtain sodium bicarbonate and ammonium sulfate sol...

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PUM

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Abstract

The invention relates to a method for producing alumina with aluminum-containing metallurgical material; the process comprises sulfuric acid decomposition of aluminum-containing metallurgical material, aluminium sulfate solution purification, aluminum precipitation of sodium carbonate salt, aluminum hydroxide calcination, sodium carbonate salt regeneration, sulphuric acid regeneration and other main procedures; the sulphuric acid, sodium bicarbonate and other chemical raw materials used in an alumina production process can be regenerated and recycled; and the method has the advantages of good alumina product quality, low production cost, environmental-friendliness and the like.

Description

technical field [0001] The invention relates to a method for producing alumina from aluminum-containing metallurgical materials. Background technique [0002] Alkaline, acid, combined acid-base and thermal processes can be used to produce alumina. Alkali method process is: aluminum-containing metallurgical materials are decomposed by alkali to obtain sodium aluminate solution, sodium aluminate solution is decomposed to obtain aluminum hydroxide, and aluminum hydroxide is calcined to obtain aluminum oxide; acid method process is: decomposed with nitric acid, sulfuric acid or hydrochloric acid Acidic aluminum salt solution is obtained from aluminum-containing metallurgical materials, aluminum salt solution is crystallized to obtain hydrated aluminum salt crystals or alkali neutralized to obtain aluminum hydroxide, hydrated aluminum salt crystals or aluminum hydroxide is calcined to obtain alumina; the process of acid-base combined method is: first Use the acid method to prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/26C01F7/428
CPCC01F7/26C01F7/428
Inventor 王学文王明玉
Owner CENT SOUTH UNIV
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