Method for extracting aluminium and iron from high-iron bauxite trihydrate

A technology of high-speed iron sanshui and bauxite, which is applied in the field of extracting aluminum and iron, can solve the problems of not using bauxite process method, etc., and achieve the effect of simplifying the process

Inactive Publication Date: 2006-03-08
GUIYANG AL-MG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, the aluminum industry at home and abroad has not yet utilized this type of bauxite process.

Method used

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  • Method for extracting aluminium and iron from high-iron bauxite trihydrate

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Embodiment Construction

[0014] Embodiment of the present invention: the high-iron bauxite bauxite from the mine is sent to the raw material workshop of the alumina factory, and after the raw material is ground to 20 mesh, it is sent to the flat-bottomed mechanical stirring tank for normal pressure stripping, and the stripping condition is Caustic Na 2 o K 140g / l, temperature 103℃, dissolution time 18min, Al 2 o 3 Dissolution rate reaches 59%. The dissolution slurry is classified into coarse and fine red mud, and the coarse red mud is separated and washed by a filter. After filtration, the moisture content of the filter cake is ≤25%; the fine red mud is separated and washed by a settling tank, and the liquid-solid ratio L / S of the bottom flow of the settling tank is 3.0 ~4.0, the settling tank is reverse washed 5~6 times, the liquid-solid ratio L / S of the bottom flow of the washing tank is 2.5~3.0, and then filter with a filter press, and the moisture content of the filter cake after pressing is ≤3...

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Abstract

This invention provides a method for extracting Al and iron from a ferric gibbsite, which grinds and dissolves the ferric gibbsite then carries out rough and fine separation-washing to the red mud and sends the refined liquor to the resolving plant to separate AlOH and bake it to get A10. The red mud is matched with recovery coal and burning coal to be dried and baked then to be ground and selected magnetically to get sponge iron power to be filtered and matched with raw material, dried to get sponge iron balls.

Description

Technical field: [0001] The invention relates to a method for extracting aluminum and iron from high-iron trihydrate bauxite. Background technique: [0002] my country's high-speed railway bauxite reserves are very rich. According to the data analysis of the geological survey department, its prospective reserves are more than 1 billion tons. Due to various reasons, this type of bauxite has not yet been developed and utilized. It is my country's aluminum Potential mineral resources for industry and steel industry. [0003] High iron bauxite is mainly composed of gibbsite, goethite, hematite and kaolinite, and the secondary minerals are illite, anatase, diaspore, opal and so on. Al in the ore 2 o 3 20~27%, average 27%, Fe 2 o 3 35~48%, average 27%, SiO 2 4 to 13%, with an average of 9%, and an average aluminum-silicon ratio of 2 to 3.5. According to its type, it belongs to high-iron trihydrate bauxite. [0004] If considered according to the standards of bauxite and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/02C22B1/14C21B13/08C22B5/10B03B1/02
CPCY02P10/20
Inventor 陈德徐树涛
Owner GUIYANG AL-MG DESIGN & RES INST
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