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Method for recovering iron from red mud

A technology for recovering iron and red mud, applied in chemical instruments and methods, magnetic separation, solid separation, etc., to achieve good economic benefits and comprehensive utilization of mineral resources.

Inactive Publication Date: 2007-02-14
GUIYANG AL-MG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] High-grade sponge iron can be obtained from red mud recovery. Sponge iron is a scarce raw material in the metallurgical industry and can be used to produce high-grade alloy steel. In the production of special steel and seamless steel pipes, a certain proportion of sponge iron is required to produce high-quality It can also replace scrap steel for steelmaking. At present, the production of sponge iron in my country is still in its infancy and needs to be vigorously developed.

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  • Method for recovering iron from red mud

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Embodiment 1

[0021] Embodiment 1 of the present invention: the red mud sent from the alumina factory has a moisture content of 20-30%, and it is first piled in the red mud warehouse of the ironworks, and the water content is dried to about 10%, and then sent to the batching bin. After mixing according to the weight ratio of red mud: coal: middle ore (intermediate product of the secondary magnetic separation process) = 76:18:6, it is transported to the mud mill for extrusion molding and drying. The molding drying temperature is 300°C. Then put the industrial coal into the rotary kiln together with the dried agglomerate in the amount of 700kg / t-sponge iron, and carry out reduction roasting at 1150°C. The material stays in the rotary kiln for 5 hours, and the kiln temperature is 1000°C. Then it enters the water cooling pool to cool down to below 70°C, and the cooled clinker agglomerates are sent to the magnetic separation process. Crushed by machine, then ground to 200 mesh 80% by ball mill, ...

Embodiment 2

[0022] Embodiment 2 of the present invention: the red mud sent by the alumina plant to the ironworks, Fe 2 o 3 The content is usually ≥30%, and the water content is usually between 20 and 30%. It is also possible to use the dry red mud stored in the red mud yard for many years, and the water content is in the range of 10-20%. The clinker obtained by reduction roasting can be either one-stage ball milling or two-stage ball milling in the ball milling process.

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Abstract

This invention provides a method for recovering iron from the red mud, which dries the red mud under the sun after extracting Al2O with a Bayer process from the ferric hydrargillites and sends it to a batch bin to be mixed with coal and sponge iron to be pressed to formation, dried then to be sent to a rotary kiln together with industrial cool to be recovered and baked to be cooled and sent to the magnetic selection process for grinding to get sponge iron to be mixed with binding and calcium lime then squeezed to formation to be dried to get the sponge iron ball product.

Description

Technical field: [0001] The invention relates to a method for recovering iron from red mud in alumina production. Background technique: [0002] my country has huge reserves of high-iron bauxite. High-iron bauxite is mainly composed of gibbsite, goethite, hematite and kaolinite, and the ore contains Al 2 o 3 20-27%, Fe 2 o 3 35-48%, which is characterized in that the ore contains two useful components of alumina and iron oxide at the same time, and the content of iron oxide is higher than that of alumina. [0003] If considered according to the standards of bauxite and iron ore, the content of alumina and iron oxide in this high-iron bauxite is low, which cannot meet the requirements of their respective industrial utilization grades, but the main useful minerals in the ore are three The sum of diaspore, goethite and hematite accounts for about 70% of the total minerals. Therefore, the mine has good comprehensive development and utilization value. Economically speakin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243B03C1/00
Inventor 陈德
Owner GUIYANG AL-MG DESIGN & RES INST