Method and system for processing red mud

A red mud and calcium-based technology, applied in the field of metallurgy, can solve problems such as poor corrosion resistance, retention, and secondary pollution, and achieve the effects of solving long-term storage, realizing comprehensive utilization, and improving metallization rate

Pending Publication Date: 2017-02-15
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Bayer method for smelting alumina uses strong alkali NaOH to dissolve high-alumina, high-iron, boehmite and gibbsite bauxite, and there is no 2CaO·SiO in the resulting Bayer red mud 2 and other active ingredients, in addition to high iron content and poor corrosion resistance, it is difficult to be directly used in the building materials industry
At present, most of the domestic comprehensive utilization of red mud stays in the laboratory stage, and the utilization rate of tailings generated in the process of iron extraction is low, which is easy to cause secondary pollution

Method used

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  • Method and system for processing red mud
  • Method and system for processing red mud
  • Method and system for processing red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078]The composition of red mud is TFe23%. Put red mud, reduced coal, calcium carbonate, bentonite and water into the mixer according to the mass ratio of 100:15:4:2:14. The ball machine is used for briquetting, and the pressure of the briquetting machine is controlled at about 10MPa. The elliptical mixed pellets with a length of about 50mm and a thickness of 10-12mm can be obtained, and the pressed pellets are dried in a dryer at 200°C for 2 hours. Make sure that the dry ball moisture is less than 0.2%, and then distribute the dried pellets into the feed area of ​​the rotary hearth furnace. The temperature is controlled at 1270°C±10°C, and the mixed pellets undergo reduction reactions in the preheating zone, medium temperature zone, and high temperature zone to obtain metallized pellets with a metallization rate greater than 85%, and the obtained metallized pellets pass through the discharge area Discharge, and then supply the obtained metallized pellets to a gas melting fur...

Embodiment 2

[0080] The red mud composition is TFe29%. Red mud, reduced coal, calcium carbonate, bentonite and water are added to the mixer according to the mass ratio of 100:23:8:4:18. After the materials are fully mixed and evenly passed through the roller press The ball machine is used for briquetting, and the pressure of the briquetting machine is controlled at about 10MPa. The elliptical mixed pellets with a length of about 50mm and a thickness of 10-12mm can be obtained, and the pressed pellets are dried in a dryer at 200°C for 2 hours. Make sure that the dry ball moisture is less than 0.2%, and then distribute the dried pellets into the feed area of ​​the rotary hearth furnace. The temperature is controlled at 1270°C±10°C, and the mixed pellets undergo reduction reactions in the preheating zone, medium temperature zone, and high temperature zone to obtain metallized pellets with a metallization rate greater than 85%, and the obtained metallized pellets pass through the discharge area...

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Abstract

The invention discloses a method and system for processing red mud. The method comprises the steps that (1) the red mud, reduction coal, a calcium system additive, a binding agent and water are mixed, and a mixed material is obtained; (2) the mixed material is subjected to pellet pressing, and a mixed pellet is obtained; (3) the mixed pellet is supplied to a feeding area of a rotary hearth furnace and made to sequentially pass a preheating area, a medium-temperature area and a high-temperature area of the rotary hearth furnace to be subjected to reduction, and an obtained metallized pellet is discharged through a discharging area; (4) the metallized pellet is supplied to a gas melt separation furnace to be subjected to melt separation processing, and metallic iron and melt separation slag are obtained; (5) the melt separation slag and quartz are mixed and then subjected to casting molding, and molded slag is obtained; and (6) the molded slag is subjected to nucleating-crystallization processing, so that microcrystal glass is obtained. According to the method for processing the red mud, the iron in the red mud is effectively extracted, in addition, the melt separation slag obtained in the melt separation process and the quart are mixed, molded and then subjected to nucleating-crystallization processing, and the microcrystal glass higher in economic value can be obtained.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular, the invention relates to a method and system for processing red mud. Background technique [0002] With the development of my country's alumina industry, the discharge and harm of red mud has become an urgent problem to be solved. How to effectively use red mud is imminent. At present, the annual production of red mud in the world has exceeded 70 million tons, and the amount of red mud produced in my country's alumina production process exceeds 15 million tons per year, all of which are stored in the open air, and most of the dams of the storage yard are constructed with red mud. With the development of the aluminum industry and the reduction of the grade of bauxite ore, the amount of red mud will increase, and red mud is an alkaline substance, which is easy to alkalize the land and pollute groundwater. Therefore, the comprehensive utilization of red mud is becoming increasingly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C21B13/10C21B13/14C03C10/00C03C6/10C03C6/04C03B32/02
CPCC22B1/2406C03B32/02C03C1/002C03C10/0063C21B13/0006C21B13/008C21B13/10C21B13/14
Inventor 吴佩佩古明远王敏曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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