Comprehensive utilization method of red mud coal-base rotary kiln method

A technology of rotary kiln and red mud, applied in the direction of rotary drum furnace, furnace, furnace type, etc., can solve the problem of unable to meet the production of elemental iron and cement clinker, etc., and achieve the effects of reduced extraction cost, high processing rate and simple process

Inactive Publication Date: 2011-09-07
胡长春
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot meet the needs of producing elemental iron and cement clinker

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix the red mud with 8% of the weight of calcium carbonate and 20% of the weight of the red mud, and put it in the rotary kiln, and carry out the carbon reduction reaction at 1000 ° C. After 6 hours, the obtained sponge iron It can be separated from building materials that can be used to make bricks.

[0016] Wherein the weight percentage of selected red mud consists of: Fe 2 o 3 30%, Al 2 o 3 20%, SiO 2 20%, CaO 8%, Na 2 O10%, TiO 2 2%, loss on ignition 10%. The reduction rate of iron reaches 95%, and the recovery rate reaches 96%.

Embodiment 2

[0018] Mix the red mud with 10% of the weight of calcium carbonate and 30% of the weight of anthracite in the rotary kiln, and carry out the carbon reduction reaction at 1260 ° C. After 5 hours, the obtained bricks can be made It can be separated with building materials and sponge iron.

[0019] Wherein the weight percentage of selected red mud consists of: Fe 2 o 3 50%, Al 2 o 3 10%, SiO 2 10%, CaO 5%, Na 2 O5%, TiO 2 5%, loss on ignition 15%. The reduction rate of iron reaches 95%, and the recovery rate reaches 96%.

Embodiment 3

[0021] Red mud and 9% calcium oxide, 1% fluorite, and 35% bituminous coal by weight of red mud are fully mixed, placed in a rotary kiln, and carbonaceous reduction reaction is carried out at 1350°C. After 4 hours, the obtained sponge iron can be separated from the building material raw materials that can be used as cement filler.

[0022] Wherein the weight percentage of selected red mud consists of: Fe 2 o 3 50%, Al 2 o 3 10%, SiO 2 10%, CaO 5%, Na 2 O5%, TiO 2 5%, loss on ignition 15%. The reduction rate of iron reaches 96%, and the recovery rate reaches 97%.

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Abstract

The invention discloses a comprehensive utilization method of a red mud coal-base rotary kiln method, belonging to the field of comprehensive utilization of solid wastes. The method comprises the following steps: fully mixing the red mud, calcium-containing compound which occupies 8-14% of the red mud, and a carbon material which occupies 20-50% of the red mud; carrying out carbon smelting reduction in a coal-base rotary kiln at the temperature of 1000-1550 DEG C; and reacting for 2-6 hours to obtain sponge iron or hot molten iron and a byproduct building material. In the method, the red mud discarded in smelting aluminum oxide is effectively comprehensively utilized, thus the solid zero emission is realized. The method provided by the invention has high utilization; and the metal reduction rate reaches 95-98%, and the metal recovery rate reaches 96-98%.

Description

technical field [0001] A method for comprehensive utilization of red mud with a coal-based rotary kiln method belongs to the comprehensive utilization technology of waste in the metallurgical field, and specifically relates to a method for comprehensive utilization of red mud with a coal-based rotary kiln method for waste generated in the alumina smelting industry. Background technique [0002] Red mud, also known as red mud, is an industrial solid waste discharged after refining alumina from bauxite. Generally, it contains a large amount of iron oxide, and its appearance is similar to red soil, hence the name. But some are brown or even off-white because they contain less iron oxide. For those with high aluminum content in bauxite, the Bayer method is used to smelt aluminum, and the red mud produced is called Bayer red mud; for those with low aluminum content in bauxite, the sintering method or the combination of sintering and Bayer method is used to smelt. Aluminum, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/08C04B5/00
Inventor 胡长春
Owner 胡长春
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