Method of extracting aluminium hydroxide from potassium- and aluminium-containing ores

A technology for aluminum hydroxide and aluminum ore, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of secondary environmental pollution, waste of land resources, etc., and achieve high value and good economic benefits.

Inactive Publication Date: 2015-03-25
FUZHOU UNIV
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

On the one hand, the stacking of these waste residues will cause secondary pollution to the environment and a waste of land resources; on the other hand, potassium ore generally contains about 16%-30% alumina, how to comprehensively utilize the alumina in it, for The increasingly tense supply of bauxite in my country and the world is of great significance

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Embodiment 1: Potassium ore is potassium feldspar, and it contains potassium oxide 10%; Aluminum oxide 19%; Silicon dioxide 62%, described potassium-containing ore reacts in the sulfuric acid system to be that potassium-containing ore first reacts chemically with fluorine After destroying the crystal structure of the potassium-containing ore and then reacting with sulfuric acid, it is finally calcined with sulfuric acid at 250°C to obtain the ore reaction slag, and the potassium and aluminum in the ore are converted into soluble potassium sulfate and aluminum sulfate; after the reaction of potassium ore with sulfuric acid , the adopted solution leaching solution is the leaching solution potassium alum crystallization mother liquor; and the gypsum slag washing solution containing potassium sulfate obtained by washing the gypsum slag containing aluminum hydroxide in the subsequent liquid-solid separation of potassium alum and lime reaction, potassium ore sulfuric acid The l...

Embodiment 2

[0031] Embodiment 2: Potassium ore is alunite, and it contains 12% of potassium oxide; Calcined with sulfuric acid at 230°C to obtain ore reaction slag, the potassium and aluminum in the ore are converted into soluble potassium sulfate and aluminum sulfate, etc.; after the sulfuric acid reaction of potassium ore, the solution used for leaching is the leaching solution potassium alum crystallization mother liquor; and the gypsum slag washing solution containing potassium sulfate obtained by washing the gypsum slag containing aluminum hydroxide in the liquid-solid separation of the subsequent potassium alum and lime reaction, the leaching temperature of potassium ore after sulfuric acid reaction: 70 ° C, the obtained leaching In the process, the molar ratio of potassium sulfate to aluminum sulfate is 1:1.1. Through solution leaching, aluminum sulfate and potassium sulfate enter the leaching solution, and liquid-solid separation is carried out to obtain insoluble slag whose main c...

Embodiment 3

[0032] Embodiment 3: Potassium ore is potassium-containing shale, and its ore contains potassium oxide 9%; When the chemical reaction destroys the crystal structure of the potassium-containing ore and then reacts with sulfuric acid, it is finally calcined with sulfuric acid at 250°C to obtain the ore reaction slag, and the potassium and aluminum in the ore are converted into soluble potassium sulfate and aluminum sulfate, etc.; potassium ore sulfuric acid After the reaction, the solution leached by the adopted solution is the leaching liquid potassium alum crystallization mother liquor; and the gypsum slag washing solution containing potassium sulfate obtained by washing the gypsum slag containing aluminum hydroxide in the liquid-solid separation of the subsequent potassium alum and lime reaction, potassium The leaching temperature of the ore after sulfuric acid reaction: 60°C. In the obtained leaching solution, the molar ratio of potassium sulfate to aluminum sulfate is 1:0.7....

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Abstract

The invention discloses a method of extracting aluminium hydroxide from potassium- and aluminium-containing ores. The method comprises the following process steps: reacting the potassium- and aluminium-containing ores in a reaction system containing sulphur acid, obtaining a leaching solution containing aluminium sulphate and potassium sulphate through solution leaching and liquid-solid separation, separating out the crystal of potassium alum by lowering the temperature, carrying out a slurry mixing reaction with lime and water to obtain gypsum residue containing aluminium hydroxide, carrying out a leaching reaction with the aluminium hydroxide solution, cooling and diluting the slurry to obtain a sodium aluminate solution, adding a seed crystal, and cooling and crystallizing to obtain an aluminium hydroxide crystal. The method disclosed by the invention realizes the purpose of comprehensively extracting aluminium, potassium and by-product semi-hydrated gypsum from the potassium- and aluminium-containing ores, realizes the comprehensive utilization of the ores, and has a high aluminium yield and good comprehensive benefits.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of potassium and aluminum ores, in particular to a method for extracting aluminum hydroxide from potassium and aluminum ores. Background technique [0002] In the process of extracting potassium salt from potassium ore, how to comprehensively utilize various components in the ore is of great significance. On the one hand, the stacking of these waste residues will cause secondary pollution to the environment and a waste of land resources; on the other hand, potassium ore generally contains about 16%-30% alumina, how to comprehensively utilize the alumina in it, for The increasingly tense supply of bauxite in my country and the world is of great significance. Contents of the invention [0003] The purpose of the present invention is to provide a method for extracting aluminum hydroxide from potassium and aluminum ores from the perspective of economic feasibility. The present invention pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/26
CPCC01F7/26
Inventor 旷戈尚亚伟陈光炉孙加兴胡松金冉
Owner FUZHOU UNIV
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