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Method and system for recovery of valuable metals from red mud

A valuable metal, red mud technology, applied in the chemical industry, can solve the problems of increasing the comprehensive utilization rate of red mud, high alkali content, low product added value, etc., to achieve the effect of broadening the utilization value

Active Publication Date: 2017-11-07
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is mainly limited by the high alkali content, the high cost of dealkalization in the prior art, the economic unreasonableness of single alkali recovery, the low added value of products produced after dealkalization, and the lack of sufficient policy support. Therefore, for many years No technical breakthrough has been achieved, but only the red mud dealkalization technology has made a breakthrough, and the comprehensive utilization rate of red mud may increase significantly

Method used

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  • Method and system for recovery of valuable metals from red mud
  • Method and system for recovery of valuable metals from red mud
  • Method and system for recovery of valuable metals from red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Red mud, reduced coal and quicklime are mixed and batched, wherein the mass ratio of red mud, reduced coal and quicklime is 100:20:20, and then the obtained mixed batch is rolled and mixed to obtain a mixed material, and then the mixed material is formed Treatment to obtain mixed pellets, and then roast the mixed pellets at 1150°C to obtain sodium oxide and a solid mixture containing sodium aluminate and iron, and then ultrafinely grind the obtained solid mixture containing sodium aluminate and iron Process to obtain ultrafine powder, wherein, the particle diameter in the ultrafine powder is not higher than 0.056 mm and accounts for 80wt% of the total ultrafine powder, and then the gained ultrafine powder is carried out to wet magnetic separation to obtain iron products (iron content greater than 87wt%) ), sodium aluminate solution and tailings, wherein the sodium oxide in the tailings is 0.9wt%, TFe is lower than 15wt%, and calculated according to the sodium oxide in re...

Embodiment 2

[0070] Red mud, reduced coal and quicklime are mixed and batched, wherein the mass ratio of red mud, reduced coal and quicklime is 100:20:25, and then the obtained mixed batch is rolled and mixed to obtain a mixed material, and then the mixed material is formed Treatment to obtain mixed pellets, and then roast the mixed pellets at 1200°C to obtain sodium oxide and a solid mixture containing sodium aluminate and iron, and then ultrafinely grind the obtained solid mixture containing sodium aluminate and iron Process to obtain ultrafine powder, wherein, the particle diameter in the ultrafine powder is not higher than 0.056 mm and accounts for 85wt% of the total ultrafine powder, and then the gained ultrafine powder is carried out to wet magnetic separation to obtain iron products (iron content greater than 90wt%) ), sodium aluminate solution and tailings, wherein, the sodium oxide in the tailings is lower than 0.7wt%, and TFe is lower than 13wt%. According to the calculation of so...

Embodiment 3

[0072] Red mud, reduced coal and quicklime are mixed and batched, wherein the mass ratio of red mud, reduced coal and quicklime is 100:25:30, and then the obtained mixed batch is rolled and mixed to obtain a mixed batch, and then the mixed batch is mixed at 1200 Roasting treatment at ℃ to obtain sodium oxide and a solid mixture containing sodium aluminate and iron, and then subject the obtained solid mixture containing sodium aluminate and iron to ultrafine grinding to obtain ultrafine powder, among which, the ultrafine powder is medium-sized Those whose diameter is not higher than 0.056 mm account for 90wt% of the total ultrafine powder, and then the obtained ultrafine powder is subjected to wet magnetic separation to obtain iron products (iron content greater than 90wt%), sodium aluminate solution and tailings, wherein the tailings The sodium oxide in the medium is lower than 0.55wt%, and the TFe is lower than 13wt%. According to the calculation of sodium oxide in red mud and...

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Abstract

The invention discloses a method and system for recovering valuable metal from red mud. The method includes the steps of mixing the red mud, a reducing agent and quick lime to obtain mixed materials; secondly, roasting the raw materials to obtain sodium oxide and a solid mixture with sodium aluminate and iron; thirdly, superfine milling the solid mixture with sodium aluminate and iron to obtain superfine powder; fourthly, separating the superfine powder to obtain an iron product, a sodium aluminate solution and tailings. By means of the method, the valuable metal including iron, sodium and aluminum in the red mud can be recovered, and therefore the value in use of the red mud is increased.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular, the invention relates to a method and system for recovering valuable metals from red mud. Background technique [0002] my country is a big producer of alumina, and red mud is the polluting waste discharged from the aluminum industry when it extracts alumina. Generally, for every ton of alumina produced, 1.0 to 2.0 tons of red mud are incidentally produced. Because red mud contains lye, it is a strong alkali pollutant, and it is a very serious source of strong alkali pollution caused by alumina plants. The fundamental way to prevent red mud pollution is to realize the comprehensive utilization of red mud, but so far, the amount of red mud that has been rationally used in the world is only a small part, so that red mud has caused serious environmental pollution in some places. . The red mud produced in the world is about 70 million tons every year, and the red mud produced in my c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 古明远王敏刘占华王欣曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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