Method and system for comprehensive utilization of copper tailings and converter coarse dust ash

A technology for coarse dust removal and copper tailings, applied in the field of metallurgy, can solve problems such as increased energy consumption, increased slag volume, and reduced iron content

Active Publication Date: 2017-05-17
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The iron in copper slag mainly exists in the form of fayalite. When the direct reduction-crushing magnetic separation process is used for treatment, a large amount of limestone needs to be added to improve the reduction process, which greatly reduces the iron content in the reduced product and increases the amount of slag produced. Large, high energy consumption

Method used

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  • Method and system for comprehensive utilization of copper tailings and converter coarse dust ash
  • Method and system for comprehensive utilization of copper tailings and converter coarse dust ash

Examples

Experimental program
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Effect test

Embodiment 1

[0070] refer to figure 1 and 2 19wt% of the coarse dust removal of the converter, 19wt% of the coarse dust removal of the coal powder, 18wt% of the coal dust, and the balance of copper tailings are mixed uniformly in proportion in the batching device 100 to form a mixture, and the wet grinding device 200 Wetting and milling for 3 minutes, the particle size of the mixture is 0.074 mm or less, accounting for 91 wt%, and then it is made into pellets through the pelletizing device 300, and dried for later use. The pellets are evenly distributed into the reduction roasting device 400, the temperature in the furnace is 1200-1240°C, and the reduction time is 39 minutes to obtain metallized pellets and zinc oxide dust; then the obtained roasted products are crushed and subjected to two-stage grinding and Two-stage magnetic separation (the proportion of the first-stage grinding fineness below 0.074mm accounts for 70-75wt%, the magnetic field strength of the first-stage magnetic separa...

Embodiment 2

[0072] refer to figure 1 and 2 22wt% of the rough dust removal of the converter, copper tailings, semi-coke, 18wt% of the coarse dust removal of the converter, and 18wt% of the semi-coke, and the balance is that the copper tailings are mixed uniformly in proportion in the batching device 100 to form a mixture, and the wet grinding device 200 Wetting and milling for 5 minutes, the particle size of the mixture is below 0.074mm, accounting for 93%, and then pelletizing device 300 is used to make pellets, and dried for later use. Evenly distribute the pellets into the reduction roasting device 400, the temperature in the furnace is 1200-1250°C, and the reduction time is 42 minutes to obtain metallized pellets and zinc oxide dust; then the obtained roasted products are crushed and then subjected to two-stage grinding and Two-stage magnetic separation (the proportion of the first-stage grinding fineness below 0.074mm accounts for 70-75wt%, the magnetic field strength of the first-s...

Embodiment 3

[0074] refer to figure 1 and 2 , the mixture of pulverized coal and semi-coke mass ratio of 1: 1, coarse dust removal of converter, copper tailings, 16wt% of the mixture of pulverized coal and semi-coke mass ratio of 1: 1, coarse dust removal of converter 25wt%, remaining The amount is that the copper tailings are uniformly mixed in proportion in the batching device 100 to form a mixture, and the grinding device 200 is used to moisten and grind for 7 minutes. The particle size of the mixture is 0.074 mm or less, accounting for 95 wt%, and then the pelletizing device 300 is made into pellets. Dry and set aside. Evenly distribute the pellets into the reduction roasting device 400, the temperature in the furnace is 1210-1260°C, and the reduction time is 40 minutes to obtain metallized pellets and zinc oxide dust; then the obtained roasted products are crushed and then subjected to two-stage grinding and Two-stage magnetic separation (the proportion of the first-stage grinding f...

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Abstract

The invention provides a method and system for comprehensive utilization of copper tailings and converter coarse dust ash. The method and system relate to separating and enriching of iron and zinc in the copper tailings and the converter coarse dust ash. Specifically, the copper tailings, the converter coarse dust ash and a carbon-containing reducing agent are used as raw materials, and by means of material mixing, wet grinding-pelletizing, reduction roasting, and ore grinding-magnetic separation work procedures, metal iron powder and copper slag secondary tailings are obtained. The produced metal iron powder can serve as raw materials of steel making of an electric furnace or a converter, the copper slag secondary tailings can be used for producing building materials such as cement and baking-free bricks, and therefore iron resources and secondary tailings can be fully utilized, and the comprehensive utilization of the copper tailings and the converter coarse dust ash is achieved. The method can also meet the requirements of the non-ferrous industry, the iron and steel industry and the building material industry, and has good social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and more specifically, the invention relates to a method and a system for comprehensive utilization of copper tailings and converter coarse dust removal. Background technique [0002] my country's copper output ranks first in the world, and more than 95% of copper is produced through pyrometallurgy, which produces a large amount of copper slag. The cumulative stock of copper slag in my country has exceeded 50 million tons. In 2015, my country's copper output reached 7.96 million tons, of which copper produced by pyrometallurgy copper accounted for more than 95% of the total output, and every ton of copper produced by pyrometallurgical copper smelting accounted for more than 95% of the total output. It is necessary to produce about 2 tons of copper slag, so the output of copper slag in my country has reached more than 15 million tons in 2015. Copper slag can be regarded as FeO-SiO 2 -CaO terna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C22B5/10C21B13/00
CPCC21B13/00C22B1/248C22B5/10
Inventor 丁银贵刘占华曹志成薛逊王欣王岩陈文亮吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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