A comprehensive utilization method for low-grade bauxite

A low-grade bauxite and alumina technology, applied in aluminum compounds, chemical instruments and methods, aluminum hydroxide preparation, etc., can solve the problems of rising production costs, falling efficiency, increasing material consumption and energy consumption, and achieving significant environmental protection performance , the effect of low energy consumption

Inactive Publication Date: 2015-02-11
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most alumina plants in my country will be forced to use lower-grade bauxite, which will cause serious problems such as increased material consumption and energy consumption, reduced efficiency, and increased production costs for alumina companies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The composition of raw material low-grade bauxite is: Al 2 o 3 : 56.0%, SiO 2 : 16.0%, Fe 2 o 3 : 8.0%, discretionary reduction: 12.9%. The composition of the raw material low-grade bauxite can also adopt other components and specific dosages, which cannot be used to limit the protection scope of the present invention.

[0022] Take 1000g of the above-mentioned low-grade bauxite, dry grind the low-grade bauxite, add 36% hydrochloric acid into the hydrochloric acid-resistant reaction kettle and mix it with the low-grade bauxite. The molar ratio of the sum of iron to HCl in hydrochloric acid is 1:9, heated to 80°C, and the reaction time is 150 minutes. After the reaction cools down, solid-liquid separation and washing are obtained to obtain aluminum chloride and ferric chloride solution and high-silicon slag, and realize aluminum-iron Separation from silicon; add sodium hydroxide solution to the obtained solution to obtain aluminum hydroxide and iron hydroxide precip...

Embodiment 2

[0024] Get the low-grade bauxite that adopts in 1000g embodiment 1, with low-grade bauxite dry grinding, 10% hydrochloric acid is joined in the hydrochloric acid resistant reactor and mixed with low-grade bauxite, low-grade bauxite The molar ratio of the sum of aluminum oxide and iron oxide in the medium to HCl in hydrochloric acid is 1:7, heated to 180°C, and the reaction time is 150 minutes. After the reaction cools down, the solid-liquid separation and washing are obtained to obtain aluminum chloride and ferric chloride solution and high-silicon slag to realize the separation of aluminum, iron and silicon; add sodium hydroxide solution to the resulting solution to obtain aluminum hydroxide and iron hydroxide precipitation and sodium chloride solution, and then carry out solid-liquid separation and washing; the obtained aluminum hydroxide and iron hydroxide Metallurgical grade alumina and high-iron slag can be obtained from the solid through a simple Bayer process. The simple...

Embodiment 3

[0026] Get the low-grade bauxite that adopts in 1000g embodiment 1, with low-grade bauxite dry grinding, 25% hydrochloric acid is joined in the hydrochloric acid resistant reactor and mixed with low-grade bauxite, low-grade bauxite The molar ratio of the sum of aluminum oxide and iron oxide in the medium to HCl in hydrochloric acid is 1:4, heated to 110°C, and the reaction time is 60 minutes. After the reaction cools down, the solid-liquid separation and washing are obtained to obtain aluminum chloride and ferric chloride solution and high-silicon slag to realize the separation of aluminum, iron and silicon; add sodium hydroxide solution to the resulting solution to obtain aluminum hydroxide and iron hydroxide precipitation and sodium chloride solution, and then carry out solid-liquid separation and washing; the obtained aluminum hydroxide and iron hydroxide Metallurgical grade alumina and high-iron slag can be obtained from the solid through a simple Bayer process. The simple ...

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Abstract

The invention relates to a comprehensive utilization method for bauxite and particularly relates to a comprehensive utilization method for low-grade bauxite. The method includes following steps of: (1) mixing the low-grade bauxite with hydrochloric acid after ore grinding; (2) performing solid liquid separation and washing after the reaction is cooled; (3) adding the solution obtained in the step (2) into a sodium hydroxide solution to obtain an aluminium hydroxide precipitate, an iron hydroxide precipitate and a sodium chloride solution, performing solid liquid separation, and washing; (4) preparing the aluminium hydroxide and iron hydroxide solid obtained in the step (3) into metallurgy-level aluminum oxide and high-iron slag through a simple Bayer process; (5) subjecting the sodium chloride solution obtained in the step (3) to electrolysis by an ionic exchange membrane electrolytic cell to obtain hydrogen, chlorine and a sodium hydroxide solution; and (6) returning the sodium hydroxide solution that is discharged from an ionic membrane cathode zone in the step (5) into the step (3) and recycling. The method is obvious in environment protection effects, and effectively separates aluminum, iron and silicon in the low-grade bauxite to achieve comprehensive utilization.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of bauxite, in particular to a method for comprehensive utilization of low-grade bauxite. Background technique [0002] Over the years, with the rapid development of the national economy, my country's iron and steel industry and alumina industry have achieved unprecedented development and become the world's largest producer of steel and alumina. However, due to resource shortages, my country's iron ore relies heavily on foreign imports. There is no right to speak in iron ore pricing, which restricts the further development of my country's iron and steel industry. With the rapid development of the national economy, my country's alumina industry has also developed rapidly. According to current data, there are more than 40 alumina enterprises in my country, with a production capacity of more than 50.5 million tons per year built and under construction, of which the production capacity of proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/20C01G49/06
CPCC01F7/34C01B7/012C25B1/02C25B1/16C25B1/26
Inventor 李来时
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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