A method for separating and recovering valuable metals in copper smelting soot by multi-stage controlled atmosphere roasting

A technology for copper smelting soot and valuable metals, which is applied to the treatment of copper smelting soot, copper smelting soot full-fire recovery of valuable metals, multi-stage controlled atmosphere roasting to separate and recover valuable metals in copper smelting soot, which can solve energy consumption High pollution, high pollution, low comprehensive recovery rate of metal elements, etc., to achieve the effect of low energy consumption, simple operation and low cost

Active Publication Date: 2020-03-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the existing comprehensive utilization technology of copper smelting soot, there are generally technical problems such as high energy consumption, heavy pollution, and low comprehensive recovery rate of metal elements.

Method used

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  • A method for separating and recovering valuable metals in copper smelting soot by multi-stage controlled atmosphere roasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using soot from a copper smelter (metal content is Cu7.6%, As13.5%, Cd2.3%, Pb23.2%, Sn1.8%, Zn18.3%) as raw material, the weight ratio of copper ash is 3% % of bentonite and 8.0% of water, mixed evenly to make pellets, and multi-stage roasting after the raw pellets are dried. The first-stage calcination temperature is 400°C, and the calcination atmosphere is O 2 / (O 2 +N 2 ) = 5.0%, the roasting time is 180min, and arsenic-rich dust (66.3% of arsenic content) is recovered from the dust removal system; the second-stage roasting temperature is 900°C, the roasting atmosphere is air, and the roasting time is 120min, and the cadmium-rich dust is recovered from the dust removal system Soot (cadmium content 79.8%); the three-stage roasting temperature is 950°C, the roasting atmosphere is air, the roasting time is 120min, and the lead-rich smoke (lead content 86.3%) is recovered from the dust removal system; the fourth-stage roasting temperature is 950°C, the roasting atmosp...

Embodiment 2

[0027] Using soot from a copper smelter (metal content is Cu7.6%, As13.5%, Cd2.3%, Pb23.2%, Sn1.8%, Zn18.3%) as raw material, the mass ratio of copper ash is 1 % of sodium humate binder and 10.0% of water, after mixing evenly, pelletizing is carried out, and after the green pellets are dried, multi-stage roasting is carried out. The first-stage calcination temperature is 600°C, and the calcination atmosphere is O 2 / (O 2 +N 2) = 0.5%, the roasting time is 120min, and the arsenic-rich dust (arsenic content 68.3%) is recovered from the dust removal system; the second-stage roasting temperature is 600°C, the roasting atmosphere is air, and the roasting time is 180min, and the cadmium-rich dust is recovered from the dust removal system Soot (cadmium content 75.4%); the three-stage roasting temperature is 1050 ° C, the roasting atmosphere is air, the roasting time is 180 minutes, and the lead-rich smoke dust (lead content 84.9%) is recovered from the dust removal system; the four...

Embodiment 3

[0029] Using soot from a copper smelter (metal content is Cu10.2%, As16.2%, Cd1.9%, Pb20.7%, Sn2.1%, Zn15.4%) as raw material, the mass ratio of copper ash is 2 % of CMC and 9.0% of water, mixed evenly to make pellets, and multi-stage roasting after the green pellets are dried. The first-stage calcination temperature is 500°C, and the calcination atmosphere is O 2 / (O 2 +N 2 )=1.5%, the roasting time is 120min, and the arsenic-rich dust (69.4% of arsenic content) is recovered from the dust removal system; the second-stage roasting temperature is 800°C, the roasting atmosphere is air, the roasting time is 120min, and the cadmium-rich dust is recovered from the dust removal system Soot (cadmium content 79.4%); the three-stage roasting temperature is 1000 ° C, the roasting atmosphere is air, the roasting time is 180 minutes, and the lead-rich smoke dust (lead content 80.8%) is recovered from the dust removal system; the fourth-stage roasting temperature is 1050 ° C, the roastin...

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Abstract

The invention discloses a method for separating and recycling valuable metal from copper smelting ash through multi-section controlled atmosphere roasting. The method includes the steps that copper ash, a binder and water are evenly mixed and pelletized; and after green balls are dried, first-section weak oxidization low-temperature roasting for recycling arsenium, second-section oxidation medium-temperature roasting for removing sulphur and recycling cadmium at the same time, third-section strong oxidation high-temperature roasting for recycling lead, fourth-section weak reduction high-temperature roasting for recycling tin and fifth-section strong reduction high-temperature roasting for recycling zinc are sequentially conducted, roasting residues are copper-rich residues, and the processdirectly returns to the copper pyrometallurgical process. By means of the method, stepped extraction and high-efficiency recycling of main valuable elements, including arsenium, cadmium, lead, tin, zinc and copper, in the copper smelting ash can be achieved, no secondary waste liquid or solid waste is formed in the whole process, and no harm is caused to the environment.

Description

technical field [0001] The present invention relates to a method for processing copper smelting soot, in particular to a method for recovering valuable metals from copper smelting soot by full-fire method, in particular to a method for separating and recovering valuable metals in copper smelting soot by multi-stage controlled atmosphere roasting, belonging to Mineral processing and non-ferrous metallurgy fields. Background technique [0002] my country is the world's largest copper producer and consumer, and more than 90% of copper is produced by pyrotechnics. According to incomplete statistics, for every ton of refined copper produced, 30-50kg of smelting soot will be formed at the same time, and the total annual output of copper smelting soot by domestic copper smelting enterprises reaches 3-5 million tons. Copper soot mainly contains copper, lead, zinc, arsenic, tin, bismuth, cadmium and other valuable metal elements, and its content far exceeds that of natural ore, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B1/24C22B1/02C22B13/02C22B17/02C22B19/30C22B25/02C22B25/06
CPCC22B1/02C22B1/2406C22B7/001C22B7/02C22B13/025C22B17/02C22B19/30C22B25/02C22B25/06Y02P10/20
Inventor 张元波苏子键姜涛刘会群刘硕李光辉彭志伟饶明军范晓慧黄柱成郭宇峰杨永斌古佛全韩本来王娟
Owner CENT SOUTH UNIV
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