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Method and system for utilizing copper tailings comprehensively

A technology of copper tailings and tailings, applied in the field of metallurgy, can solve the problems of difficult gas pollution, harsh conditions, and many process links, and achieve significant economic benefits and high added value

Active Publication Date: 2016-06-15
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these methods cannot be further developed due to low copper removal ability or too harsh conditions.
For example, when melting separation is used, it is only suitable for processing small pieces of steel scrap containing a large amount of exposed copper; if gasification separation is used, it is difficult to promote it on a large scale due to problems such as many process steps and gas pollution; if vacuum separation is used, it is only suitable for Decopper from molten steel, but there are problems such as large iron loss and slow removal speed, so it is difficult for large-scale industrial application

Method used

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  • Method and system for utilizing copper tailings comprehensively
  • Method and system for utilizing copper tailings comprehensively

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0097] Copper tailings: reducing agent: additive: binder = 100:15:20:1 by mass ratio to pelletize, wherein the TFe grade of copper tailings is 35%, the Cu content is 0.4%, and the Zn content is 1%. , the S content is 0.1%, and its particle size is -0.045mm, accounting for 90%. The pelletized products are dried and put into the rotary hearth furnace for direct reduction. 50min, in the direct reduction process of the rotary hearth furnace, zinc oxide dust with a zinc content of 52% can be obtained through dust collection in the flue, and the roasted product can be obtained after two stages of grinding, and the iron powder containing copper can be obtained, and its TFe grade is 88%. The Cu content is 1%, the S content is <0.1%, and its particle size is -0.074mm, accounting for 60%.

[0098] Export the reducing atmosphere in the high temperature zone of the rotary hearth furnace, and then obtain CO gas containing a small amount of sulfur oxides after dust removal; the CO gas and t...

Embodiment example 2

[0104] Copper tailings: reducing agent: additive: binder = 100:20:10:3 by mass ratio to pelletize, wherein the TFe grade of copper tailings is 40%, the Cu content is 0.3%, and the Zn content is 1.5% , The S content is 0.3%, and its particle size is -0.045mm, accounting for 90%. The pelletized products are dried and put into the rotary hearth furnace for direct reduction. 40min, in the direct reduction process of the rotary hearth furnace, zinc oxide dust with a zinc content of 58% can be obtained through dust collection in the flue, and the roasted product can be obtained after two stages of grinding, and the iron powder containing copper can be obtained, and its TFe grade is 90%. Cu content is 0.5%, S content <0.4%, and its particle size is -0.074mm, accounting for 80%.

[0105] Export the reducing atmosphere in the high temperature zone of the rotary hearth furnace, and then obtain CO gas containing a small amount of sulfur oxides after dust removal; the CO gas and the CO ga...

Embodiment example 3

[0111] The copper tailings: reducing agent: binder = 100:30:5 are pelletized according to the mass ratio, wherein the TFe grade of the copper tailings is 45%, the Cu content is 0.2%, the Zn content is 2%, and the S content is 0.2%, and its particle size is -0.045mm, which accounts for 90%. After the pelletized product is dried, it is put into the rotary hearth furnace for direct reduction. During the direct reduction process of the rotary hearth furnace, zinc oxide dust with a zinc content of 62% can be obtained through dust collection in the flue, and the roasted product can be obtained after two-stage grinding and selection to obtain copper-containing iron powder with a TFe grade of 94% and a Cu content of 0.4 %, S content <0.4%, and its particle size is -0.074mm, accounting for 90%.

[0112] Export the reducing atmosphere in the high temperature zone of the rotary hearth furnace, and then obtain CO gas containing a small amount of sulfur oxides after dust removal; the CO ga...

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Abstract

The invention provides a method and system for utilizing copper tailings comprehensively. The method for utilizing the copper tailings comprehensively comprises the steps of mixing and pre-treating the copper tailings, reducing agents, adding agents and binders for obtaining material pellets conveniently; roasting the material pellets at high temperature for obtaining roasted products and zinc oxide dust conveniently; carrying out ore grinding and magnetic separation on the roasted products for obtaining copper-bearing iron powder; enabling the copper-bearing iron powder and carbon monoxide to react for obtaining gaseous pentacarbonyl iron and solid slag; depressurizing and cooling a synthesis gas reaction unit and converting the gaseous pentacarbonyl iron into liquid pentacarbonyl iron for obtaining solid-liquid mixtures conveniently; carrying out solid-liquid separation on the solid-liquid mixtures for obtaining the liquid pentacarbonyl iron and solid tailings; gasifying and resolving the liquid pentacarbonyl iron for obtaining metal iron powder and the carbon monoxide; carrying out fine grinding and flotation treatment on the solid tailings for obtaining copper concentrate and tailings. Through the method, zinc, copper and iron in the copper tailings can be effectively separated.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular, the invention relates to a method and a system for comprehensively utilizing copper tailings. Background technique [0002] Copper tailings refer to the tailings obtained from copper smelting slag after flotation to recover copper. Its total iron grade is generally 35% to 45%, copper content is generally 0.2% to 0.4%, and its particle size is generally -0.045mm, accounting for 90%. %above. Due to the high iron content in copper tailings, in addition to zinc, copper and other valuable elements, it is necessary to comprehensively recycle copper tailings, which will not only create economic benefits, but also bring good environmental and social benefits . [0003] At present, when copper tailings are treated with the "direct reduction-grinding magnetic separation" process, the comprehensive recycling of iron and zinc can be realized. The final products are copper-containing iron powder and...

Claims

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Application Information

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IPC IPC(8): C22B15/00
CPCC22B15/0054
Inventor 刘占华王欣曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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