Method for co-processing arsenic sulfide slag and arsenic-containing smoke in copper smelting

A co-processing and arsenic sulfide technology, applied in the field of metallurgy, can solve the problems of poor stability of arsenic-containing solid waste, large consumption of iron powder, long process flow, etc., achieve efficient removal and stable solidification, less loss of valuable metals, The effect of high arsenic removal efficiency

Inactive Publication Date: 2021-11-23
CENT SOUTH UNIV
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Problems solved by technology

[0003] CN107904406A discloses a method for treating arsenic-containing smoke and dust by pyrolysis, so that copper is enriched in slag, and As 2 o 3 , Sn, Pb, Zn DC furnace soot is sent to the electric furnace for volatilization and reduction, arsenic is reduced to simple arsenic, and Sn, Pb, Zn enters the enriched slag and is sent to tin smelting. In this invention, there is incomplete separation of arsenic, enriched slag, and copper slag Subsequent processing is still a troublesome problem, and the efficient separation of valuable metals has not really been realized
CN110331300A discloses a method of treating arsenic-containing smoke and dust with copper smelting sewage acid, obtaining arsenic-containing leachate under the condition of oxygen pressure leaching, using sodium sulfide precipitation to obtain copper sulfide, and obtaining arsenic trioxide through reduction and crystallization of sulfur dioxide. About 10g / L, which will have a certain impact on the extraction of other metals in the later stage
CN110093510A uses low-temperature roasting to process arsenic-containing smoke and dust to obtain arsenic trioxide, uses atmospheric pressure acid leaching to obtain leaching solution for roasting slag, uses iron powder replacement to obtain sponge copper, and then uses oxygen pressure acid leaching for leaching slag to obtain indium-containing leaching solution and lead and tin slag. Finally, indium and electrodeposited zinc are obtained through zinc powder replacement and electrodeposition treatment. This invention has long process flow, complicated operation, high production cost, and low purity of arsenic trioxide, so post-processing is required.
Among them, dilute sulfuric acid leaching is the main method for leaching dust in most metallurgical enterprises, which can make copper, zinc, iron, arsenic and other elements in the dust enter the solution. Metallurgical enterprises usually use the method of adding iron powder to realize the replacement and decopper in the solution. , but there is a problem of large consumption of iron powder and high cost. At the same time, because the solution contains arsenic, arsine gas may be generated during the reduction process, which will deteriorate the working environment.
In the arsenic removal stage, although the traditional lime-iron salt method, sulfidation method, and lime neutralization method can effectively remove arsenic, the arsenic-containing solid waste after removal has poor stability and is prone to arsenic back-dissolution, posing safety hazards

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  • Method for co-processing arsenic sulfide slag and arsenic-containing smoke in copper smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Taking a domestic arsenic-containing smoke as an example, it includes the following main components in terms of mass percentage: Pb 8.92%, As 15.6%, Fe 1.59%, Cu 2.58%, Zn 29.89%.

[0052] The arsenic sulfide slag includes the following main components in terms of mass percentage: arsenic: 25.8%, copper: 0.21%, selenium: 0.11%, sulfur: 34.7%.

[0053] Weigh 20g of arsenic-containing dust into a three-neck flask, add 140ml of H 2 SO 4 , stirring speed 300r / min, H 2 SO 4 The leaching experiment was carried out under the conditions of concentration 1mol / L, leaching temperature 50℃, and leaching time 3h. After leaching, remove the slurry, wash with water, filter and separate to obtain leaching slag and acid leaching solution, the leaching rate of arsenic is 98.72%, the leaching rate of copper is 99.40%, the leaching rate of zinc is 95.73%, and the concentration of each element in the leaching solution is Zn 42.39g / L, Cu 3.80g / L, As 23.69g / L, Fe 0.26g / L, Pb 34.71ppm, and...

Embodiment 2

[0057] Taking the domestic arsenic-containing dust as an example, it includes the following main components in terms of mass percentage: Pb 7.35%, As12.56%, Fe 3.2%, Cu 3.52%, Zn 22.10%.

[0058] The arsenic sulfide slag includes the following main components in terms of mass percentage: arsenic: 32.4%, copper: 1.13%, selenium: 0.19%, sulfur: 48.5%.

[0059] Weigh 20g of arsenic-containing fumes into a three-necked flask, add 60ml of H 2 SO 4 , stirring speed 500r / min, H 2 SO 4 The leaching experiment was carried out under the conditions of concentration 0.3mol / L, leaching temperature 85℃, and leaching time 2h. After leaching, remove the slurry, wash with water, filter and separate to obtain leaching slag and acid leaching solution, the leaching rate of arsenic is 95.03%, the leaching rate of copper is 90.35%, the leaching rate of zinc is 92.11%, and the concentration of each element in the leaching solution is Zn 74.02g / L, Cu 11.56g / L, As 47.73g / L, Fe 0.44g / L, Pb 32.13ppm...

Embodiment 3

[0062] Taking domestic arsenic-containing dust as an example, it includes the following main components in terms of mass percentage: Pb 6.65%, As 8.78%, Fe 5.64%, Cu 10.21%, Zn 5.65%.

[0063] The arsenic sulfide slag includes the following main components in terms of mass percentage: arsenic: 15.62%, copper: 2.69%, selenium: 1.30%, sulfur: 23.56%.

[0064] Weigh 20g of arsenic-containing dust into a three-neck flask, add 200ml of H 2 SO 4 , stirring speed 700r / min, H 2 SO 4 The leaching experiment was carried out under the conditions of concentration 0.5mol / L, leaching temperature 50℃, and leaching time 2h. After leaching, remove the slurry, wash with water, filter and separate to obtain leaching slag and acid leaching solution, the leaching rate of arsenic is 96.49%, the leaching rate of copper is 96.54%, the leaching rate of zinc is 97.21%, and the concentration of each element in the leaching solution is Zn 5.78g / L, Cu10 .38g / L, As 8.92g / L, Fe 1.34g / L, Pb 21.65ppm, and...

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Abstract

The invention relates to a method for co-processing arsenic sulfide slag and arsenic-containing smoke in copper smelting. The method comprises the following steps that copper, zinc, iron, arsenic and like enter a solution through normal-pressure acid leaching of arsenic-containing smoke, lead is recovered from leaching slag through a lead smelting system, copper in smoke acid leaching liquid is precipitated through sulfuration of the arsenic sulfide slag, ferrous sulfate is added into the solution after copper precipitation, high-stability scorodite is obtained through reaction under the condition of oxygen pressure, the loss of valuable metal in the arsenic precipitation process is small, and the arsenic-removed solution with few impurities can be directly fed to a zinc electrodeposition process to obtain electrodeposited zinc or evaporated and crystallized to obtain a zinc sulfate product. According to the method, the valuable metal recovery rate is high, operation is easy, the problems that the arsenic sulfide slag is low in value and difficult to treat are effectively solved through arsenic sulfide slag sulfuration copper precipitation, and efficient utilization of dangerous solid waste and harmless treatment of arsenic are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for synergistic treatment of copper smelting arsenic sulfide slag and arsenic-containing smoke and dust. Background technique [0002] During the pyro-smelting process of copper, a large amount of arsenic-containing fumes will be produced. Arsenic-containing fume contains a large amount of copper, zinc, arsenic, etc. If it is not recycled, it will not only cause waste of resources, but also pollute the environment. At present, some metallurgical enterprises directly process the arsenic-containing fume in the form of stockpiling. Since the soot contains a large amount of soluble arsenic, direct stockpiling will cause serious pollution to the surrounding environment; as the content of arsenic in copper concentrate continues to increase, soot Returning to the smelting system as a raw material will not only cause a large amount of arsenic to accumulate, but a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C01G9/06C22B13/00C22B15/00C22B30/04C25C1/16
CPCC22B7/007C22B13/045C22B15/0089C22B30/04C25C1/16C01G9/06Y02P10/20
Inventor 刘智勇刘志宏张家润周蓬勃
Owner CENT SOUTH UNIV
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