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A method for separating copper and arsenic in copper-arsenic slag

A technology for arsenic residue and acid leaching residue, which is applied in the direction of improving process efficiency, can solve the problems of low arsenic leaching rate, difficult to achieve good separation of arsenic and copper, etc., and achieves the effect of low labor intensity, environmental friendliness, and efficient leaching.

Active Publication Date: 2018-11-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since most arsenic exists in solid solution in the copper-arsenic slag, the leaching rate of arsenic in the conventional alkaline leaching process is low, and it is difficult to achieve good separation of arsenic from valuable metals such as copper, antimony, and bismuth.

Method used

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  • A method for separating copper and arsenic in copper-arsenic slag

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Embodiment 1

[0018] Copper arsenic slag finely ground to a particle size of 100% less than 0.149mm, its main components are (%): Cu 41.48, As 22.85, Pb 3.09, Sb 2.68; industrial grade sodium hydroxide, wherein the content of sodium hydroxide is ≥96% ; Industrial grade sulfuric acid, where H 2 SO 4 Content ≥ 98%; industrial grade oxygen, of which O 2 Content ≥ 99%; industrial grade hydrogen peroxide, of which H 2 o 2 Content ≥ 27.5%; industrial grade sodium sulfide, of which Na 2 S content ≥ 60%.

[0019] Dissolve 72g of the above-mentioned industrial grade sodium hydroxide in 600ml of water and add it to a pressure reactor with a volume of 1L, then add 100g of copper arsenic slag, then slowly raise the temperature to 160°C, after the temperature is stabilized, introduce oxygen to keep the oxygen partial pressure at 0.20MPa , Control the stirring speed to 800 r / min and react for 6h. After the reaction is completed, turn off the oxygen and heat, pass cooling water into the reactor thro...

Embodiment 2

[0023] Copper arsenic slag finely ground to a particle size of 100% less than 0.149mm, its main components are (%): Cu 50.65, As 25.28, Pb 4.86, Sb 5.64; industrial grade sodium hydroxide, wherein the content of sodium hydroxide is ≥96% ; Industrial grade sulfuric acid, where H 2 SO 4 Content ≥ 98%; industrial grade oxygen, of which O 2 Content ≥ 99%; industrial grade hydrogen peroxide, of which H 2 o 2 Content ≥ 27.5%; industrial grade sodium sulfide, of which Na 2 S content ≥ 60%.

[0024] Dissolve 96g of the above-mentioned industrial grade sodium hydroxide in 800ml of water and add it to a pressure reactor with a volume of 1L, then add the above-mentioned 100g of copper arsenic slag, control the stirring speed at 800r / min, then slowly raise the temperature to 220°C, and pass the Oxygen was introduced to keep the oxygen partial pressure at 0.50MPa and react for 2h. After the reaction was completed, cooling water was passed into the reaction kettle through the cooling ...

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Abstract

The invention provides a method for separating copper and arsenic from copper-arsenic slag. The method comprises the steps that the copper-arsenic slag is subjected to pressurized oxidation leaching in a sodium hydroxide system, the arsenic and a small amount of heavy metal ions enter a solution, and the remaining copper, antimony and lead enter oxidated and leached slag after being subjected to oxidation; the heavy metal ions which enter the pressurized and oxidated solution are subjected to sulfide precipitation, and a sodium arsenate solution obtained is subjected to crystallization dearsenifying and then returns to the alkaline pressurized oxidation leaching system; the copper, antimony, lead and other elements which enter the oxidated and leached slag are subjected to leaching utilizing sulfuric acid, the copper can be subjected to subsequent electrodeposition for extraction of the copper after entering the solution, and the antimony and lead are reserved in acid-leached slag and subjected to subsequent separation and recovery. By means of the pressurized oxidation leaching, the efficient leaching of the arsenic from the copper-arsenic slag can be achieved, the leaching rate of the arsenic reaches 96% or above, and furthermore, the subsequent acid leaching of the copper is facilitated through the further oxidation of the copper in the copper-arsenic slag; the precipitation rate of the heavy metal ions, including the copper, antimony and lead reaches 85% or above; and the method for separating the copper and the arsenic from the copper-arsenic slag is lower in corrosivity to equipment, friendly to environment and low in labour intensity.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of metallurgy, in particular to a method for effectively separating copper and arsenic in copper-arsenic slag. Background technique [0002] In the process of copper electrolytic refining, the increase of copper ions in the electrolyte is about 1.5~2.0% of the dissolved amount of anode slime. In addition, the electrolyte also contains impurity ions such as arsenic, antimony and bismuth. Electrolytic deposition is usually used to remove copper and Arsenic, antimony, lead and other impurity ions. At present, the continuous decopper and arsenic electrodeposition method is widely used in the process, so that copper, arsenic, antimony, lead, etc. . Beijing: Science Press, 2003, 564-573). [0003] In order to recover valuable metals such as copper in copper-arsenic slag and realize the open circuit of arsenic, the main smelting methods usually used are roasting method, acid leaching method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B30/04C22B30/02C22B15/00C22B13/00
CPCC22B7/007C22B7/008C22B13/045C22B15/0071C22B30/02C22B30/04Y02P10/20
Inventor 张杜超令红斌卢一帆杨天足刘伟锋陈霖
Owner CENT SOUTH UNIV
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