Recycling method for copper smelting slag

A recovery method and technology of copper smelting slag, which is applied in the field of metallurgical engineering, can solve the problems of reducing the quality of copper matte, increasing the pressure of impurity removal, waste of resources, etc., achieving high recovery rate, avoiding pollution, and saving costs

Active Publication Date: 2021-02-05
CENT SOUTH UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, in the existing utilization technology, the copper utilization rate of copper smelting slag is lower than 12%, the utilization rate of Pb / Zn is not more than 1%, and more than 90% of the copper smelting slag is discarded and stored, which is difficult to use, resulting in waste of resources, and smelting There are valuable metal elements such as Pb / Zn in the slag, and there are ecological security risks such as leaching of harmful ions during the storage process
In the existing technology, all the copper blowing slag is returned to the smelting system, but impurities such as Pb / Zn enter the copper matte during the smelting process, which reduces the quality of the copper matte and increases the pressure of the subsequent process of impurity removal

Method used

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  • Recycling method for copper smelting slag

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Effect test

Embodiment 1

[0061] Such as figure 1 Shown, a kind of resource recovery method of copper smelting slag, comprises the following steps:

[0062] (1) With 200g copper flash blowing slag as raw material, its main chemical composition includes Cu25.5%, Pb10.6%, Zn2.29%, Fe28.9%, SiO 2 1.01%, CaO8.95%. Put the blowing slag into the reduction furnace 1, raise the temperature to 1350°C, add 5% calcium sulfate and 4% quartz to the molten copper blowing slag through the feeding device, and inject 5% calcium sulfate into the high-temperature melt by the powder spraying device After standing for 2.5 hours at heat preservation, high-grade copper matte phase, sulfidation-reduction slag (as the raw material melt in the next step, the temperature is 1250°C-1300°C) and flue gas are produced. The copper grade of the high-grade copper matte phase is 78.3%, the contents of lead and zinc are 18.8% and 0.1% respectively, and the high-grade copper matte phase returns to the blowing system. After calculation,...

Embodiment 2

[0067] Such as figure 1 Shown, a kind of resource recovery method of copper smelting slag, comprises the following steps:

[0068] (1) With 200g copper flash blowing slag as raw material, its main chemical composition includes Cu20.4%, Pb8.2%, Zn3.2%, Fe30.1%, SiO 2 1.34%, CaO9.04%. Put the blowing slag into the reduction furnace 1, raise the temperature to 1350°C, add 10% calcium sulfate and 8% quartz to the molten copper blowing slag through the feeding device, and spray 10% calcium sulfate into the high-temperature melt by the powder spraying device After standing for 3 hours, high-grade copper matte phase, sulfidation-reduction slag (as the raw material melt in the next step, the temperature is 1250°C-1300°C) and flue gas will be produced. The copper grade of the high-grade copper matte phase is 77.4%, the contents of lead and zinc are 18.4% and 0.93% respectively, and the high-grade copper matte phase returns to the blowing system. After calculation, the recovery rates...

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Abstract

The invention discloses a recycling method for copper smelting slag. The recycling method comprises the following steps: (1) mixing copper blowing slag, a vulcanizing agent 1, a slag type modifying agent 1 and a reducing agent for smelting to obtain high-grade copper sulfur, flue gas and vulcanizing-reducing slag, wherein the high-grade copper sulfur is blown to recycle copper; (2) mixing the vulcanizing-reducing slag, the copper smelting slag, a vulcanizing agent 2, a slag type tempering agent 2 and a reducing agent 2 for smelting to obtain low-grade copper sulfur, flue gas and furnace slag,wherein the low-grade copper sulfur is smelted to recycle copper; and (3) collecting dust of flue gas in the step (1) and the step (2) to obtain smoke dust rich in lead and zinc, wherein lead and zincare recycled from the smoke dust rich in lead and zinc through a lead and zinc recycling system. The copper blowing slag and the copper smelting slag are cooperatively treated, so that efficient enriching and recycling for valuable metals such as copper, lead and zinc in the copper smelting slag are achieved, and thus, environmental pollution and resource waste caused by stock-piling are avoided.

Description

technical field [0001] The invention belongs to the field of metallurgical engineering, and in particular relates to a treatment method for resource recycling of copper smelting slag. Background technique [0002] With the over-exploitation of human beings, metal mineral resources have been depleted day by day. At present, the grade of copper ore in the mining stage is as low as 0.2-0.3%, but the copper content in copper smelting slag is indeed several times or even dozens of times higher, which is a potential resource. Copper slag is the product of matte smelting and matte blowing during pyrometallurgy. According to the classification of slag-producing equipment, it can be divided into top-blown furnace slag, converter slag, flash smelting slag, etc.; according to different slag cooling methods, it can be divided into Water quenching slag, natural cooling slag, thermal insulation cooling slag, etc.; according to the production process, it can be divided into smelting slag,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C22B1/00C22B7/02C22B13/02C22B19/30
CPCC22B7/04C22B7/002C22B15/0028C22B15/0006C22B1/005C22B15/0054C22B7/02C22B13/025C22B19/30Y02P10/20
Inventor 王亲猛李中臣郭学益田庆华李栋田苗王松松张倍恺
Owner CENT SOUTH UNIV
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