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Comprehensive treatment method for red mud and copper slag

A comprehensive treatment and red mud technology, applied in the direction of process efficiency improvement, etc., can solve the problems of fayalite reduction in copper slag, fine iron particles cannot be aggregated, and low pellet strength, so as to achieve sustainable development and clean Production, high strength effect

Active Publication Date: 2015-12-23
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art in this field, the purpose of the present invention is to propose a comprehensive treatment method for red mud and copper slag, which solves the problem that red mud and copper slag are difficult to form into pellets and the strength of pellets is not high. Problems, the problem that iron particles are too fine to be aggregated in the process of red mud reduction alone, and the problem of difficult reduction of fayalite in copper slag in the process of copper slag reduction alone

Method used

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  • Comprehensive treatment method for red mud and copper slag

Examples

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Effect test

Embodiment 1

[0030] A copper smelting slag, the composition of chemical analysis is: TFe40.12%, Na 2 O0.46%; red mud produced by a certain Bayer method, its composition is: TFe35.92%, Na 2 O6.89%. After copper slag and red mud are mixed at a mass ratio of 1:2, TFe37.32% in the mixed raw material of red mud and copper slag, Na 2 O4.75%.

[0031] After the mixed raw materials are moistened and milled for 3 minutes, 35% reducing agent (lignite with 50% carbon content) is added to make pellets, and the pellets are dry and the wet ball strength is >8 times. The pellets are dried and then roasted at a roasting temperature of 1250°C. The metallized pellets obtained have a metallization rate of 90.2%. The pellets are subjected to grinding and magnetic separation to finally obtain metallic iron powder with a purity of 92.12% and an iron recovery rate of 85%. .

Embodiment 2

[0033] A copper smelting slag, its composition is: TFe40.12%, Na 2 O0.46%; a Bayer red mud, its composition is: TFe32.03%, Na 2 O7.9%. After mixing copper slag and red mud at a mass ratio of 1:1, the mixed raw material of red mud and copper slag contains TFe36.08%, Na 2 O4.18%.

[0034] After milling the mixed raw materials for 4 minutes, add 25% reducing agent (semi-coke with 70% carbon content) to make pellets, the pellets are dry and the wet ball strength is >9 times. The pellets were dried and then roasted at a roasting temperature of 1250°C. The metallization rate of the obtained metallized pellets was 90.88%. The pellets were subjected to grinding and magnetic separation to finally obtain metallic iron powder with a purity of 91.05% and an iron recovery rate of 87%. .

Embodiment 3

[0036] A copper smelting slag, its composition is: TFe39.21%, Na 2 O0.41%; a Bayer red mud, its composition is: TFe33.51%, Na 2 O7.20%. After copper slag and red mud are mixed at a mass ratio of 1:1.2, the mixed raw material of red mud and copper slag contains TFe36.10%, Na 2 O4.11%.

[0037] After the mixed raw materials are wetted and ground for 4 minutes, 17% reducing agent (anthracite with 80% carbon content) is added to make pellets, and the pellets are dry and the wet ball strength is more than 10 times. The pellets were dried and then roasted at a roasting temperature of 1280°C. The metallized pellets obtained had a metallization rate of 92.32%. The pellets were subjected to grinding and magnetic separation to finally obtain metal iron powder with a purity of 92.55% and an iron recovery rate of 88%. .

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Abstract

The invention provides a comprehensive treatment method for red mud and copper slag. The method comprises the steps that 1, the red mud and the copper slag are mixed to obtain a mixed raw material of the red mud and the copper slag, then a reducing agent is added into the mixed raw material to be evenly mixed, and a mixture is obtained; 2, roasting is conducted; and 3, the mixture is crushed and milled after being cooled, magnetic separation is conducted, and finally metal iron power and tailings are obtained. Through the method, the problems that when the copper slag and the red mud are pelletized independently, pelletizing is difficult, iron particles can not be gathered due to fineness of the iron particles in the independent reduction process of the red mud and fayalite is difficult to restore in the independent reduction process of the copper slag are solved.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a treatment method for red mud and copper slag. Background technique [0002] In recent years, the world's copper production has grown rapidly, and my country's copper production has leapt to the first place in the world. In my country, more than 97% of copper output is produced by pyrometallurgy, and pyrometallurgy occupies a dominant position. Copper pyrometallurgy produces a large amount of high-iron copper slag, which occupies a large amount of land and has a certain impact on the surrounding environment. The iron content of copper slag is between 30% and 40%, which is higher than the grade of iron ore used in domestic industrial beneficiation. Due to the different sources of copper ore, copper slag also contains valuable metal elements such as cobalt, nickel, and zinc. A large amount of copper slag rich in iron and copper is piled up, which not only causes ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02
CPCY02P10/20
Inventor 王敏古明远刘占华王欣曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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