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A method and system for processing red mud and recovering iron fine powder

A technology for recycling iron and red mud, applied in the direction of improving process efficiency, etc., can solve the problems of high CO content in reducing gas, long roasting time, high temperature, etc., achieve high iron recovery rate, reduce roasting energy consumption, and improve utilization rate Effect

Active Publication Date: 2017-10-03
湖南长拓高科冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: to provide a method and system for processing red mud to recover iron concentrate, and to solve the problems of long roasting time, high temperature and CO in the reducing gas in the existing process of red mud recovery iron concentrate. High content, high energy consumption and other issues

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  • A method and system for processing red mud and recovering iron fine powder
  • A method and system for processing red mud and recovering iron fine powder

Examples

Experimental program
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Effect test

Embodiment 2

[0061] The Bayer process red mud of an aluminum factory in Shandong, with a total iron grade of 27.3%, obtained a high-strength magnetic concentrate with a total iron grade of 35.3% after rough separation by strong magnetic field, which reduced the amount of roasting in the furnace by 36%. After flash magnetization roasting-weak magnetic After selection, the beneficiation indicators of 61-62% iron concentrate grade, 53-56% yield, 85-89% iron recovery rate and 9-13% iron grade of tailings were obtained. Calculated based on the current market price of 60% iron ore powder products with a total iron grade of 500 yuan / ton, 2 million tons of red mud can be processed annually, and 650,000 tons of iron ore powder can be obtained, achieving an annual output value of 325 million yuan; The amount of mud discharged saves the capital construction and maintenance costs of the tailings dam.

Embodiment 3

[0063] The red mud of a domestic aluminum factory has a total iron grade of 20.5%. After strong magnetic roughing, a strong magnetic concentrate with a total iron grade of 30% is obtained, which reduces the amount of roasting in the furnace by 60%. After flash magnetization roasting-weak magnetic separation , obtained the beneficiation indexes of 60-61% iron concentrate grade, 48-51% yield, 82-85% iron recovery rate and 10-13% iron grade of tailings. Calculated based on the current market price of 60% iron ore powder products with a total iron grade of 500 yuan / ton, 2 million tons of red mud can be processed annually, and 330,000 tons of iron ore powder can be obtained, achieving an annual output value of 165 million yuan; The amount of mud discharged saves the capital construction and maintenance costs of the tailings dam.

[0064] In addition, after the implementation of the present invention, not only the fine iron powder is recovered, but also other valuable metals in the ...

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Abstract

The invention belongs to the technical field of solid waste recycling and discloses a method and a system for processing red mud to recycle refined iron powder. The method for processing the red mud to recycle the refined iron powder includes steps that mixing the red mud with water, and performing high intensity magnetic roughing to obtain high intensity magnetic separation concentrate and high intensity magnetic separation tailings; removing alkaline from the high intensity magnetic separation concentrate to obtain neutral high intensity magnetic separation concentrate with pH value about 7; after airing or drying the neutral high intensity magnetic separation concentrate, scattering to obtain powder; after pre-heating the powder, sending to a flash magnetization roasting furnace to perform magnetization roasting to obtain roasted red mud; cooling to obtain cool roasted red mud; performing low intensity magnetic separation to obtain the refined iron powder and tailings. According to the method and system for processing the red mud to recycle the refined iron powder, the roasting reaction speed is fast, the time is short, the energy consumption is low, and the refined iron powder with high iron grade and high iron recovery is obtained after performing low intensity magnetic separation.

Description

technical field [0001] The invention relates to the technical field of solid waste recycling and utilization, in particular to a method and system for processing red mud and recovering fine iron powder. Background technique [0002] Red mud is a kind of red muddy strong alkaline solid waste after refining alumina from bauxite in the aluminum industry. Generally speaking, 1.0-2.5 tons of red mud will be produced for every 1 ton of alumina produced. According to incomplete estimates, the world's current annual emissions are about 60 million tons, but its utilization rate is only about 15%. So far, no effective way to use red mud in large quantities has been found. Since a large amount of red mud cannot be recycled, most Use yard wet storage, direct reclamation, reclamation after neutralization, or simple treatment after dehydration and drying. The stacking of red mud not only occupies a large amount of land, but also costs a lot for construction and maintenance of the storage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02
CPCY02P10/20
Inventor 庄大英高泽斌李永恒赵沛
Owner 湖南长拓高科冶金有限公司