Method for extracting aluminum oxide from low grade bauxite

A low-grade bauxite and alumina technology, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of long process and high energy consumption, achieve low corrosion, small residue, and easy industrial application Effect

Inactive Publication Date: 2008-02-27
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of producing alumina by sintering includes dry system and wet system, which has a long process and high energy consumption

Method used

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  • Method for extracting aluminum oxide from low grade bauxite

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Embodiment 1

[0024] Low-grade bauxite from a certain area in China is used, and the molecular ratio of ammonium sulfate / alumina in low-grade bauxite is 5. Dissolution under the conditions, the aluminum ammonium sulfate solid obtained after crystallization of the stripping liquid is decomposed by ammonia gas, and the aluminum hydroxide solid is obtained. After washing, filtering and roasting, the alumina product is obtained. The impurity chemical composition of the obtained alumina product is: Fe 2 o 3 : 0.02%, SiO 2 : 0.08%.

Embodiment 2

[0026] Low-grade bauxite from a certain area in China is used, and the molecular ratio of ammonium sulfate / alumina in low-grade bauxite is 4. The sintering reaction temperature is 500 ° C, the reaction time is 2 hours, and the sintering clinker is at 85 ° C. The aluminum ammonium sulfate solid obtained after crystallization of the stripping solution is decomposed by ammonia gas to obtain aluminum hydroxide solid. After washing, filtering and roasting, the alumina product is obtained. The impurity chemical composition of the obtained alumina product is: Fe 2 o 3 : 0.05%, SiO 2 : 0.05%.

Embodiment 3

[0028] Low-grade bauxite from a province in China is used, and the molecular ratio of ammonium sulfate / alumina in low-grade bauxite is 4.5. The sintering reaction temperature is 460°C, the reaction time is 3 hours, and the sintering clinker is 90°C. Dissolution under certain conditions, the aluminum ammonium sulfate solid obtained after crystallization of the dissolution liquid is recrystallized after dissolution, and then decomposed with ammonia gas to obtain aluminum hydroxide solid. After washing, filtering and roasting, the alumina product is obtained. The obtained oxidation The chemical composition of impurities in aluminum products is: Fe 2 o 3 : 0.04%, SiO 2 : 0.04%.

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Abstract

The invention discloses a method to extract aluminum oxide from low-grade alumyte, which comprises the following steps: allocating ammonia sulfate; caking with low-grade alumyte; getting clinker; dissolving out; getting ammonia alum solution; crystallizing; getting solid ammonia alum; reacting with ammonia gas; getting aluminum hydroxide and ammonia sulfate; washing; filtering; getting solid aluminum hydroxide; caking; getting aluminum oxide product; entering into liquid phase ammonia sulfate; evaporating; cycling. This method possesses little residue, which takes the advantage of comprehensive utilization.

Description

technical field [0001] A method for extracting alumina from low-grade bauxite relates to a process for extracting alumina from low-grade bauxite and comprehensively utilizing the residue after alumina extraction. Background technique [0002] At present, the production of alumina mainly uses bauxite as raw material, and the production methods of alumina are mainly alkaline method, including Bayer method, sintering method and combined method. In recent years, my country's alumina production has continued to grow rapidly and has become the world's second largest alumina producer. However, my country is a country with relatively poor bauxite resources. Currently, the nationally identified and inferred bauxite resource reserves have a significant impact on my country's alumina production. The degree of industrial guarantee is low, so the resource problem has become one of the main problems restricting the sustainable development of my country's aluminum industry. [0003] my cou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/26
Inventor 尹中林范伟东刘汝兴
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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