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Method of preparing aluminum oxide from clay mine by citric acid extraction

A technology of aluminum citrate and citric acid, applied in chemical instruments and methods, alumina/hydroxide preparation, inorganic chemistry, etc., can solve the problems of large environmental pollution, low income, long cycle, etc., and achieve weakened equipment corrosion resistance. performance, increase the rate of hydrolysis, reduce the effect of acidity

Inactive Publication Date: 2007-10-24
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the other aluminum-containing resource ores that cannot be used in the current alumina production are high in silicon, high or low in aluminum, and low in aluminum-silicon ratio. The cost of producing alumina is high, Long cycle, low income, difficult to handle residues, and great environmental pollution

Method used

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  • Method of preparing aluminum oxide from clay mine by citric acid extraction
  • Method of preparing aluminum oxide from clay mine by citric acid extraction
  • Method of preparing aluminum oxide from clay mine by citric acid extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Will 1 # After crushing and ball milling the ore samples, the clay ore is made into particles with a particle size of 833 μm to 74 μm, placed in a muffle furnace and roasted at 625°C for 3 hours, leached with a citric acid solution with a mass concentration of 6%, and the stirring intensity is 300r / min, the mass concentration of pulp dry ore is 10%, the treatment time is 6 hours, four stages of continuous leaching, the leaching slag of the previous stage is used as the leaching ore sample of the latter stage. After each stage of leaching is completed, filter while hot. The slag after four stages of leaching was taken to analyze the content of Al2O3, SiO2 and Fe2O3. The crude filtrate was placed for 12 hours, a large amount of white precipitate was formed, and microfiltration was performed. The microfiltrate is returned to the leaching section for recycling.

[0027] chemical composition

Embodiment 2

[0029] Will 2 # After crushing and ball milling the ore samples, the clay ore is made into particles with a particle size of 833 μm to 74 μm, placed in a muffle furnace and roasted at 575°C for 2.5 hours, leached with a citric acid solution with a mass concentration of 4%, and the stirring intensity is 200r / min, the pulp concentration is 15%, and the treatment time is 4 hours. There are three stages of continuous leaching, and the leaching slag of the previous stage is used as the leaching ore sample of the latter stage. After each stage of leaching is completed, filter while hot. The slag after two stages of leaching was taken to analyze the content of Al2O3, SiO2 and Fe2O3. The crude filtrate was placed at room temperature for 12 hours, a large amount of white precipitate was formed, and microfiltration was performed. The microfiltrate is returned to the leaching section for recycling.

[0030] chemical composition

Embodiment 3

[0032] Will 3 #After crushing and ball milling the ore samples, the clay ore is made into particles with a particle size of 833 μm to 74 μm, placed in a muffle furnace and roasted at 675°C for 3.5 hours, and leached with a citric acid solution with a mass concentration of 4%, with a stirring intensity of 300r / min, the pulp concentration is 10%, and the treatment time is 5 hours. There are three stages of continuous leaching, and the leaching slag of the previous stage is used as the leaching ore sample of the latter stage. After each stage of leaching is completed, filter while hot. The slag after three stages of leaching was taken to analyze the content of Al2O3, SiO2 and Fe2O3. The crude filtrate was placed at room temperature for 12 hours, a large amount of white precipitate was formed, and microfiltration was performed. The microfiltrate is returned to the leaching section for recycling.

[0033] chemical composition

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Abstract

The invention discloses an alumina manufacturing method through leaching clay by citrate, which is characterized by the following: adopting organic citrate as leaching agent to leach the sintered aluminium in the clay; filtering to remove the leached slag; cooling and stewing the leached liquid; sedimenting the aluminium citrate; sintering the aluminium citrate through high temperature to produce the alumina product; circulating the leaching liquid with little polluting discharge.

Description

technical field [0001] A method for producing alumina by leaching clay ore with citric acid relates to a method for producing alumina by using an acid method, in particular a method for producing alumina by leaching aluminum-containing resources with weak acid citric acid. Background technique [0002] my country is rich in aluminum-containing resources, and the current proven reserves are as high as several trillion tons, with a wide distribution. At present, most of the commonly used alumina production processes are alkaline methods, including Bayer method, sintering method, and hybrid method. Acid method is rarely used. The main consideration is that the acid method has serious corrosion and requires high acid resistance of equipment. However, the Bayer process requires the A / S of raw materials to be greater than 8.0; the sintering method does not have high requirements for the ratio of aluminum to silicon, but the sintering process is relatively complicated and the energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C01F7/20
Inventor 曹慧君周吉奎李旺兴
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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