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Method and system for comprehensive utilization of red mud

A technology of red mud and mixture, applied in the field of comprehensive utilization of red mud, can solve the problem of low utilization rate of industrial waste, and achieve the effects of solving low utilization rate of industrial waste, efficient dealkalization, and long-term storage.

Active Publication Date: 2017-04-05
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, an object of the present invention is to propose a method and system for comprehensive utilization of red mud, which can realize high-efficiency dealkalization of red mud, and can convert red mud into high value-added water-quenched slag, thereby fundamentally Solve the problem of low utilization rate and long-term storage of industrial waste such as red mud

Method used

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  • Method and system for comprehensive utilization of red mud
  • Method and system for comprehensive utilization of red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Red mud and reduced coal are mixed and batched to obtain a mixed material, and then the mixed material is reduced and roasted at 1300°C to obtain a solid mixture containing sodium oxide and metallic iron, wherein the sodium content of the solid mixture containing metallic iron is 3.68 wt%, the removal rate of sodium is 45wt%, and then the obtained solid mixture containing metallic iron is mixed with quicklime and then subjected to melting treatment, wherein the mass ratio of solid mixture containing metallic iron to quicklime is 100:5 to obtain sodium oxide, Molten iron and tailings, wherein, the comprehensive dealkalization rate reaches 92wt% during the reduction roasting treatment and melting process, the iron content in the hot metal is 96wt%, and the iron recovery rate is 97wt%, and then the tailings are mixed with quicklime and silica according to the mass ratio of 100 : 25: 35 are mixed and smelted to obtain smelting slag, and then the obtained smelting slag is sub...

Embodiment 2

[0067] Red mud and reduced coal are mixed and batched to obtain a mixed material, and then the mixed material is reduced and roasted at 1280°C to obtain a solid mixture containing sodium oxide and metallic iron, wherein the sodium content of the solid mixture containing metallic iron is 4.18 wt%, the removal rate of sodium is 40wt%, and then the obtained solid mixture containing metallic iron is mixed with quicklime and then subjected to melting treatment, wherein the mass ratio of solid mixture containing metallic iron to quicklime is 100:5 to obtain sodium oxide, Molten iron and tailings, wherein, the comprehensive dealkalization rate reaches 92wt% in reduction roasting treatment and melting process, the iron content in hot metal is 95wt%, and the iron recovery rate is 98wt%, and then the tailings are mixed with quicklime and silica according to the mass ratio of 100 : 28: 35 are mixed and smelted to obtain smelting slag, and then the obtained smelting slag is subjected to wa...

Embodiment 3

[0069] Red mud and reduced coal are mixed and batched to obtain a mixed material, and then the mixed material is reduced and roasted at 1280°C to obtain a solid mixture containing sodium oxide and metallic iron, wherein the sodium content of the solid mixture containing metallic iron is 3.29 wt%, the removal rate of sodium is 45wt%, and then the obtained solid mixture containing metallic iron is mixed with quicklime to carry out melting treatment, wherein, the mass ratio of solid mixture containing metallic iron to quicklime is 100:8 to obtain sodium oxide, Molten iron and tailings, wherein, the comprehensive dealkalization rate reaches 92wt% during reduction roasting treatment and melting process, the iron content in hot metal is 96wt%, and the iron recovery rate is 96wt%, and then the tailings are mixed with quicklime and silica according to the mass ratio of 100 : 30: 32 mixed and smelted to obtain smelted slag, and then water quenched to obtain smelted slag to obtain water ...

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Abstract

The invention discloses a method and system for utilizing red mud comprehensively. The method comprises the steps that 1, the red mud and a reducing agent are mixed so as to obtain a mixed material; 2, reduction roasting is carried out on the mixed material so as to obtain sodium oxide and a solid mixture containing metal iron; 3, the solid mixture containing the metal iron and calcium oxide are mixed to be separated in a melted mode, then sodium oxide is collected again, and molten iron and tailings are obtained; 4, the tailings are mixed with the calcium oxide and silica to be smelted, so that smelted slag is obtained; 5, water quenching is carried out on the smelted slag so as to obtain water-quenched slag. According to the method, the red mud can be efficiently dealkalized and converted into the water-quenched slag with high added value, so that the problems that the utilization rate of the red mud as industrial waste is low, and the red mud is piled up for a long term are solved fundamentally.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular, the invention relates to a method and system for comprehensive utilization of red mud. Background technique [0002] Red mud is the solid waste discharged during the production of alumina. It is named for its red appearance. Regardless of the Bayer method or the sintering method, about 1.0-1.8 tons of red mud are discharged for every 1 ton of alumina produced. Variations in the composition of bauxite ore and alumina production methods result in wide variations in the chemical and mineral composition of red mud. At present, there are three main methods of producing alumina in my country: Bayer method, sintering method and mixed connection method. Generally, there are two types of red mud: Bayer method red mud and sintering method red mud. [0003] Most of them are in stockpiling state, red mud stockpiling can be divided into dry stockpiling and wet stockpiling. The stacking and p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 古明远王敏任中山徐刚曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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