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Method for utilizing sulfate slag and red mud comprehensively

A technology of sulfuric acid slag and red mud, applied in the field of metallurgy, can solve the problems such as the comprehensive utilization of red mud and sulfuric acid slag needs to be studied, the sulfuric acid slag has not been developed and utilized, and the low-iron red mud cannot be directly utilized, etc. High viscosity and easy bonding effect

Active Publication Date: 2015-10-21
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high-iron red mud is generally used for recycling iron from red mud, while low-iron red mud cannot be directly used
[0004] Sulfuric acid slag is the waste residue produced in the process of producing sulfuric acid or sulfurous acid from pyrite, in which the content of TFe can reach 40%, and the highest can reach about ~60%; impurities are represented by SiO 2 Mainly, but also contains a small amount of CaO, MgO and Al 2 o 3 ; Although the iron content in the sulfuric acid slag is relatively high, because the content of the harmful element sulfur in the sulfuric acid slag is basically above 1% or even higher, and it is easy to enter the iron product during the smelting process, causing the iron product to be unusable, so sulfuric acid Slag has not been effectively developed and utilized
[0005] Therefore, the comprehensive utilization of red mud and sulfuric acid slag needs to be studied

Method used

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  • Method for utilizing sulfate slag and red mud comprehensively
  • Method for utilizing sulfate slag and red mud comprehensively

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Experimental raw materials:

[0044] The chemical composition of red mud is: TFe content 27.50%, CaO content 20.30%, Na 2 O content 2.29%;

[0045] Sulfuric acid slag, its chemical composition is: TFe content 48.71%, S content 1.25%;

[0046] Reduced coal.

[0047] experimental method:

[0048] (1) drying the red mud to obtain red mud with a water content of 5% by weight.

[0049] (2) Mix the dried red mud and sulfuric acid slag at a mass ratio of 1:1, and add reduced coal with a C / O ratio of 1.0 to obtain a mixed material.

[0050] (3) Make the mixed material into pellets.

[0051] (4) The pellets are dried and subjected to reduction roasting to obtain metallized pellets with a metallization rate of 92.34%.

[0052] (5) Separating the metallized pellets to obtain iron powder and tailings, wherein the iron grade of iron powder reaches 91.13%, the iron recovery rate reaches 92.45%, the sulfur content of iron powder is 0.056%, and the removal of sulfur The rate rea...

Embodiment 2

[0054] Experimental raw materials:

[0055] The chemical composition of red mud is: TFe content 12.97%, CaO content 40.25%, Na 2 O content 2.93%;

[0056] Sulfuric acid slag, its chemical composition is: TFe content 53.51%, S content 1.22%;

[0057] Reduced coal.

[0058] experimental method:

[0059] (1) drying the red mud to obtain red mud with a water content of 10% by weight.

[0060] (2) Mix the dried red mud and sulfuric acid slag at a mass ratio of 1:2, and add reduced coal with a C / O ratio of 1.2 to obtain a mixed material.

[0061] (3) The mixed material is reduced and roasted to obtain a reduced product with a metallization rate of 91.73%.

[0062] (4) Separating the product to obtain iron powder and tailings, wherein the iron grade of iron powder reaches 92.21%, the iron recovery rate reaches 91.72%, the sulfur content of iron powder is 0.042%, and the sulfur removal rate reaches 95.87% %.

Embodiment 3

[0064] Experimental raw materials:

[0065] Red mud, its chemical composition is: TFe content 7.21%, CaO content 49.50%, Na 2 O content 1.73%;

[0066] Sulfuric acid slag, its chemical composition is: TFe content 59.87%, S content 2.7%;

[0067] Reduced coal.

[0068] experimental method:

[0069] (1) drying the red mud to obtain red mud with a water content of 10% by weight.

[0070] (2) Mix the dried red mud and sulfuric acid slag at a mass ratio of 1:3, and add reduced coal with a C / O ratio of 1.5 to obtain a mixed material.

[0071] (3) Make the mixed material into pellets.

[0072] (4) The pellets are dried and subjected to reduction roasting to obtain metallized pellets with a metallization rate of 92.24%.

[0073] (5) Separating the metallized pellets to obtain iron powder and tailings, wherein the iron grade of the iron powder reaches 92.21%, the iron recovery rate reaches 92.77%, the iron recovery rate reaches 91.53%, and the sulfur content of the iron powder is...

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Abstract

The invention discloses a method for utilizing sulfate slag and red mud comprehensively. The method comprises the steps that the sulfate slag and the red mud are mixed with a reducing agent so as to obtain a mixed material; roasting is carried out on the mixed material so as to obtain a reduced iron product; the reduced iron product is separated so as to obtain iron powder. By the utilization of the method, the two metallurgical solid waste resources, namely the red mud and the sulfate slag are utilized comprehensively, so that the iron product with good indexes is obtained.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for comprehensively utilizing sulfuric acid slag and red mud. Background technique [0002] Red mud is the most important solid residue produced after alumina is extracted from bauxite. It is red because it contains a large amount of iron oxide, so it is called red mud. At present, the annual discharge of red mud in China exceeds 30 million tons. Except for a small part used in cement production and brick making, most of them are stored in wet open-air dams. Today, the accumulated stockpiles of red mud in China have exceeded 100 million tons. The stockpiling of red mud not only occupies a large amount of land, but also has high maintenance costs and increases the production cost of alumina; a large amount of strong alkali and high salinity waste lye seeps into nearby farmland, causing soil alkalization and swamping, and polluting surface and groundwater source, deteriorating t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02
CPCY02P10/20
Inventor 王欣刘占华王敏古明远曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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