Method for recovering arsenic from black copper sludge

A black copper slime and arsenic recovery technology, which is applied in the treatment of black copper slime and the cleaning treatment of arsenic-containing black copper slime, can solve the problems of potential safety hazards, arsenic dispersion, high cost, etc., and achieve the goal of reducing production costs and avoiding arsenic The effect of accumulation, efficient separation and extraction

Active Publication Date: 2017-06-27
CENT SOUTH UNIV +1
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Problems solved by technology

[0004] Aiming at the defects of existing techniques for extracting arsenic from black copper mud, the purpose of the present invention is to provide a method that is efficient, environmentally frien

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  • Method for recovering arsenic from black copper sludge

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[0026] Example 1

[0027] Take 100kg of black copper mud (specific components are Cu: 30.07%, As: 28.17%, Sb: 2.56%, Bi: 1.49%; the phase of black copper mud is mainly Cu 2 As and Cu 3 As) Carry out alkaline pressure oxidation leaching. The leaching process is controlled by sodium hydroxide 1.5mol / L, oxygen pressure 1.0MPa, temperature 120℃, liquid-solid ratio 5:1, reaction time 1.5h, stirring speed 500rpm, after the reaction is over, Liquid-solid separation is carried out while it is hot, and the leaching residue is a copper-enriched slag, the leaching rate of arsenic is 98.78%, and the copper is not leached. Add an appropriate amount of lime (Ca / As molar ratio = 1.5) to the leaching solution, and carry out causticizing at a temperature of 80°C, a time of 1 h and a stirring speed of 300 rpm. After the causticizing is completed, liquid-solid separation is carried out while hot, and the solid phase is arsenic acid Calcium and lye are returned to the pressurized oxidation leaching ...

Example Embodiment

[0028] Example 2

[0029] Take 100kg of black copper mud (specific components are Cu: 30.07%, As: 28.17%, Sb: 2.56%, Bi: 1.49%; the phase of black copper mud is mainly Cu 2 As and Cu 3 As) Carry out atmospheric alkaline oxidation leaching, add appropriate amount of hydrogen peroxide in the leaching process, control sodium hydroxide 2mol / L, temperature 80℃, liquid-solid ratio 7:1, reaction time 2h, stirring speed 400rpm, after the reaction, proceed while hot Liquid-solid separation, the leaching residue is a copper-enriched slag, the leaching rate of arsenic is 94.15%, and the copper is not leached. Add an appropriate amount of lime (Ca / As molar ratio = 1.5) to the leaching solution, and carry out causticizing at a temperature of 80°C, a time of 1 h and a stirring speed of 300 rpm. After the causticizing is completed, liquid-solid separation is carried out while hot, and the solid phase is arsenic acid Calcium and lye are returned to the pressurized oxidation leaching process, and...

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Abstract

The invention discloses a method for recovering arsenic from black copper sludge. The method comprises the following steps: carrying out alkaline leaching on a black copper sludge powder under an oxidation condition, causticizing a leaching solution through lime to obtain calcium arsenate, and regenerating an alkaline leaching agent during the causticizing process and returning the alkaline leaching agent to the alkaline leaching; and carrying out vacuum reduction roasting on calcium arsenate to obtain metallic arsenic and calcium oxide, wherein metallic arsenic can be directly sold, and calcium oxide is returned to the causticizing process. The method realizes the open loop of arsenic during a black copper sludge treatment process, and obtains non-toxic metallic arsenic with an economic value, and meanwhile, alkali and calcium oxide are circulated in the flow, so that alkali consumption is furthest reduced; and the method is simple in process, low in cost, environment-friendly, and great in application prospect.

Description

technical field [0001] The invention relates to a treatment method of black copper mud, in particular to a method for recovering arsenic from black copper mud, which is suitable for cleaning treatment of arsenic-containing black copper mud and belongs to the technical field of nonferrous metal metallurgy. Background technique [0002] During the electrolytic refining process of anode copper, the composition of the electrolyte changes continuously and impurities accumulate continuously. Therefore, in order to ensure the normal progress of the electrolysis process, the electrolyte must be purified and adjusted to remove impurities that are more harmful to the electrolysis process. During electrodeposition decopper removal, impurities such as As, Sb, and Bi in the copper electrolyte will be precipitated at the cathode together with Cu, and the mud (containing Cu, As, Sb, Bi, Pb) produced on the cathode etc.) is called black copper mud. [0003] At present, the processing meth...

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Application Information

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IPC IPC(8): C22B7/00C22B30/04C22B15/00
CPCC22B7/008C22B15/0008C22B30/04Y02P10/20
Inventor 刘维梁超焦芬覃文庆蔡练兵杨康郭波平阮茗陈世民
Owner CENT SOUTH UNIV
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