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Method for efficiently separating copper and arsenic in copper smelting smoke dust

A technology of copper smelting and dust, which is applied in the field of separation of copper and arsenic from copper smelting dust, can solve the problems of long process, low leaching rate, unfavorable extraction process, etc., achieve high-efficiency separation, facilitate production operation, and simplify the process.

Pending Publication Date: 2018-11-06
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional fire method, this method reduces the secondary pollution of smoke and dust, but still cannot avoid the generation of a small amount of smoke and dust
Although the wet process (acid leaching, alkali leaching, and chloride leaching, etc.) does not produce secondary pollution such as smoke and dust compared with the fire process, it is mainly a single leaching process with a long process and the acid-base content of the leachate produced Higher, not conducive to the subsequent extraction process, difficult to recover arsenic, large consumption of reagents, heavy economic burden
In addition, a large amount of copper exists in the form of sulfide in the smelting fume, especially in the fume produced by flash smelting, and the leaching rate of direct wet leaching is low. The entry of copper into the lead slag not only causes a waste of resources, but also has a great impact on the recovery of lead and bismuth.

Method used

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  • Method for efficiently separating copper and arsenic in copper smelting smoke dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 100g of copper smelting dust, the main components are 12.57% of copper, 3.46% of arsenic, 15.52% of lead, 2.9% of bismuth, 14.97% of zinc, and 11.73% of sulfur, add 500ml of water for slurry, add 25g of concentrated sulfuric acid after slurry In a water bath at 85°C, start a period of normal pressure leaching and react for 2 hours. After the reaction is over, the arsenic leaching rate is greater than 60%, and the leaching residue continues to be subjected to the second-stage oxygen-enriched pressure leaching. The controlled pressure leaching conditions are: liquid-solid ratio 5:1, initial acidity 100g / L, reaction temperature 150°C, oxygen partial pressure 5atm, reaction time 2h. After two stages of leaching, the leaching rate of copper and arsenic is greater than 90%, lead and bismuth are enriched in the leaching residue, and the leaching solution is reduced and crystallized to produce white arsenic.

Embodiment 2

[0024] Take 500g of copper smelting dust, the main components are 11.52% copper, 13.71% arsenic, 20.78% lead, 1.91% zinc, 1.45% iron, 3.13% bismuth, and 5.45% sulfur. The concentration of sulfuric acid is 5%, and the reaction time is 2 hours for a period of normal pressure leaching, and the leaching rate of copper and arsenic can reach more than 90%. After liquid-solid separation, the first-stage leaching residue is subjected to second-stage pressure leaching. The controlled pressure leaching conditions are: liquid-solid ratio 4:1, initial acidity 120g / L, reaction temperature 140°C, oxygen partial pressure 3atm, reaction time 2h. After two stages of leaching, the leaching rate of copper and arsenic is greater than 95%, realizing the efficient removal of arsenic.

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Abstract

The invention discloses a method for efficiently separating copper and arsenic in copper smelting smoke dust, and belongs to the technical field of wet metallurgy. The method comprises the steps of pulpifying the copper smelting smoke dust by adopting appropriate amount of water, a dilute sulphuric acid solution and a two-stage leaching solution, and leaching at the atmospheric pressure, wherein metallic oxide such as arsenic, copper, iron, zinc and cadmium in the smoke dust and salts are leached to enter a solution, and sulphides such as copper and arsenic hard to leach are remained in slags;and pressure leaching the leaching residues, so that the leaching rate of the arsenic and the copper is further improved, and the copper and the arsenic in the smoke dust are efficiently removed andrecycled. The invention provides the method for conveniently, quickly and efficiently removing the arsenic and the copper in the copper smelting smoke dust, so that the grade of slag containing lead and bismuth is improved; and the leaching solution is used for producing white arsenic or metal arsenic and recycling valuable metals such as the copper.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to a method for separating copper and arsenic from copper smelting smoke and dust. The arsenic product is obtained while the grade of lead and bismuth slag is improved, and the influence of arsenic and copper on subsequent lead and bismuth production is avoided. Background technique [0002] Currently, approximately 80% of the world's copper is produced through the pyrometallurgical process. In the copper pyrometallurgical smelting process, due to the effects of high temperature volatilization and airflow movement, lead, zinc, indium, bismuth, cadmium and arsenic in the copper concentrate are enriched in the dust collection system to obtain copper smelting smoke. If it is directly returned to the smelting system, it will not only greatly increase the impurity content of the raw material of the smelting furnace, deteriorate the furnace condition, and reduce the processing capac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B15/00C22B13/00C22B30/06C22B30/04
CPCC22B7/007C22B7/02C22B13/045C22B15/0067C22B30/04C22B30/06Y02P10/20
Inventor 王玉芳刘三平李相良李贺郑朝振
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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