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Acid-alkali combination method for extraction of aluminum, potassium and gallium from alunite concentrate

An acid-base combination and alumite technology, applied in the direction of improving process efficiency, can solve the problems of equipment corrosion, difficult separation of impurities by acid method, unavailability of acid, etc., and achieve the effect of avoiding separation difficulties.

Active Publication Date: 2015-01-28
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0025] The present invention aims at various deficiencies in the prior art, and aims to use alunite concentrate as a raw material to provide a process technology for recovering valuable metals such as aluminum, potassium, gallium and the like from alunite resources by using an acid-base combined method, Solve the problem that the acid produced by the alkaline process itself cannot be used, and at the same time avoid the defects of difficult separation of impurities in the acid process and equipment corrosion

Method used

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  • Acid-alkali combination method for extraction of aluminum, potassium and gallium from alunite concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Mix 90% of the alunite concentrate with a particle size of less than 200 mesh and 90% of concentrated sulfuric acid. The amount of sulfuric acid added is 1.6 times the mass of the alunite concentrate. Obtain sulfuric acid slaking material. The sulfuric acid slaking material is mixed evenly according to the coal ratio of 8%, and the rapid reduction roasting is carried out at a temperature of 750 ° C for 5 minutes.

[0063] The reduced calcined sand is soaked in water at a temperature of 90°C for 60 minutes and a liquid-to-solid ratio of 2:1, so that potassium enters the water soaking solution and aluminum is enriched in the slag. Potassium sulfate is obtained by evaporating and crystallizing the water immersion solution. The crystallization mother liquor can be returned to add water to leach the new calcined sand.

[0064] Alkali dissolution is carried out on the water leaching residue, and the dissolution conditions are: dissolution temperature 100°C, alkali concentra...

Embodiment 2

[0066] Mix the alunite concentrate with concentrated sulfuric acid, the amount of 93% concentrated sulfuric acid added is 2.2 times the mass of the alunite concentrate, after mixing evenly, the sulfuric acid slaking material is obtained under the conditions of a slaking temperature of 320° C. and a slaking time of 8 hours. The sulfuric acid slaking material is uniformly mixed with coal powder at a coal ratio of 15%, and is subjected to rapid reduction roasting at a temperature of 800°C, and the roasting time is 10 minutes.

[0067] The reduced calcined sand is soaked in water at a temperature of 70°C for 30 minutes and a liquid-solid ratio of 3:1, so that potassium enters the water soaking solution and aluminum is enriched in the slag. Potassium sulfate is obtained by evaporating and crystallizing the water immersion solution. The crystallization mother liquor can be returned to add water to leach the new calcined sand.

[0068] Alkali dissolution is carried out on the water ...

Embodiment 3

[0070] Mix the alunite concentrate with concentrated sulfuric acid, the amount of 95% concentrated sulfuric acid is 1.8 times the mass of the alunite concentrate, after mixing evenly, obtain the sulfuric acid slaking material under the condition of slaking temperature 380°C and slaking time 4h. The sulfuric acid slaking material is passed into the gas in the fluidized roasting furnace, and the rapid reduction roasting is carried out at a temperature of 750 ° C, and the roasting time is 1 min.

[0071]The reduced calcined sand is soaked in water at a temperature of 70°C for 30 minutes and a liquid-solid ratio of 3:1, so that potassium enters the water soaking solution and aluminum is enriched in the slag. Potassium sulfate is obtained by evaporating and crystallizing the water immersion solution. The crystallization mother liquor can be returned to add water to leach the new calcined sand.

[0072] Alkali dissolution is carried out on the water leaching residue, and the dissol...

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Abstract

The invention discloses an acid-alkali combination method for extraction of aluminum, potassium and gallium from alunite concentrate. The method comprises the following steps: uniformly mixing the alunite concentrate with a proper amount of concentrated sulfuric acid, curing, carrying out fast high-temperature reduction roasting to realize desulfuration; performing acid-making on sulfur-containing smoke to realize regeneration cycle utilization of sulfuric acid; carrying out water leaching on reduced calcine to extract potassium, carrying out alkaline leaching to produce aluminium oxide, and enriching and recycling gallium. According to the method, the advantages in a traditional alkaline method for extraction of aluminium oxide from alunite, and a concentrated sulfuric acid high-temperature reaction is effectively utilized to strengthen decomposition of alunite mineral, so that the recycling rate of aluminium oxide is improved, meanwhile the problem that acid produced in the alkaline method cannot be utilized is solved, and recycling of sulfuric acid is realized. The produced aluminium oxide product is good in quality, high in recycling rate, low in energy consumption, low in equipment corrosion, and easy in implementation of large-scale industrialization.

Description

technical field [0001] The invention belongs to the comprehensive utilization of alunite, and in particular relates to a method for extracting alumina, potassium sulfate and metal gallium from alunite concentrate, especially by adopting an acid-base combined process for extraction. Background technique [0002] With the rapid development of modern industry, resource scarcity has become one of the main social problems facing people. With the increase of aluminum consumption, the amount of ore mining increases, the bauxite resources decrease year by year, the grade of ore aluminum continues to decline, and the mining cost continues to increase. The extraction of alumina from certain high-silicon and low-alumina non-traditional alumina raw materials has attracted attention . [0003] The former Soviet Union, Mexico, etc. paid more attention to the research and promotion of the technology of extracting alumina by using alunite non-bauxite resources, and a large number of resear...

Claims

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Application Information

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IPC IPC(8): C22B1/06C22B3/12C22B3/04C22B21/00C22B26/10C22B58/00
CPCC22B1/06C22B3/04C22B3/12C22B21/0007C22B26/10C22B58/00Y02P10/20
Inventor 蒋开喜蒋训雄范艳青汪胜东张登高李达王爱平
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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