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Method for recovering arsenic from scrap material containing arsenic and copper produced in process of copper smelting

A technology for recovering arsenic from copper waste, applied in the field of arsenic recovery, which can solve the problems of large equipment footprint, high production cost, and long process, and achieve the effects of small equipment footprint, improved operating efficiency, and high efficiency

Inactive Publication Date: 2010-07-07
JIANGXI COPPER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the disadvantages of long process, high copper consumption, large amount of slag, large equipment footprint, and high production cost.

Method used

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  • Method for recovering arsenic from scrap material containing arsenic and copper produced in process of copper smelting
  • Method for recovering arsenic from scrap material containing arsenic and copper produced in process of copper smelting
  • Method for recovering arsenic from scrap material containing arsenic and copper produced in process of copper smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix and stir the final reduction solution and the arsenic sulfide filter cake at a liquid-to-solid ratio of 7:1.

[0015] The composition of the final reduction solution (g / L):

[0016]

[0017] The mixed slurry is pre-heated to about 50°C and pumped into the reaction kettle. The pressure of the reactor is kept at 10~12kg / cm 2 , the temperature of the reaction kettle was kept at 117-119°C, the rotation speed of the mixer was 100rpm, and the compressed air volume was 600N / hr. After five hours, after the slurry in the reactor is extracted out and cooled, the leaching solution obtained by filtering is formed (gram / liter):

[0018]

[0019] The leaching rate of As reaches 96.47%.

[0020] The slag composition (%) obtained by washing the leached slag with water:

[0021]

[0022] The slag rate of the leaching residue is 33.83%.

[0023] After fine filtration, the leachate is passed through SO 2 Gas reduction crystallization, air volume maintained at 300m 3 Af...

Embodiment 2

[0025] Mix and stir the final reduction solution and the arsenic sulfide filter cake at a liquid-to-solid ratio of 8:1.

[0026] The composition of the final reduction solution (g / L):

[0027]

[0028] Composition (%) of arsenic sulfide filter cake:

[0029]

[0030] The mixed slurry is pre-heated to about 50°C and pumped into the reaction kettle. Reactor pressure maintained at 10.5kg / cm 2 , The temperature of the reaction kettle is kept at 90-115°C, the rotation speed of the mixer is 80rpm, and the compressed air volume is 600N / hr. After four hours, after the slurry in the reactor was extracted and cooled, the leaching solution obtained by filtering was composed (gram / liter):

[0031]

[0032] The leaching rate of As reaches 95.74%.

[0033] The composition of the slag obtained by washing the leached slag with water (g / L):

[0034]

[0035] The slag rate of the leaching slag is 37.21%.

[0036] After fine filtration, the leachate is passed through SO 2 Gas ...

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PUM

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Abstract

The invention provides a method for recovering arsenic from scrap material containing arsenic and copper produced in process of copper smelting, comprising the following steps: mixing waste acid containing 18 / L of arsenic solution with arsenic filter cake according to proportion by weight of 8:1 and stirring the mixture; preheating the mixture and sucking size into a reaction kettle, warming and pressurizing the size by conveying compressed air by an air compressor, then separating the pressurized leaching agent; injecting sulfur dioxide after carrying out secondary filtration on filter liquor to reduce arsenic acid to arsenoxide for seedout. The method of the invention features simple technique, saved copper powder consumption and improved arsenic recovery rate.

Description

technical field [0001] The invention relates to a method for recovering arsenic from arsenic-containing copper waste produced in the copper smelting process. Background technique [0002] The existing method of recovering arsenic from the arsenic-containing copper waste produced in the copper smelting process is to react the final reduction solution with copper powder, mix and stir the copper sulfate solution obtained by leaching with the arsenic filter cake, and then pump the obtained slurry through pre-oxidation. into the oxidation tank, blow air into it with a fan, and keep the temperature of the oxidation tank at about 75°C, and the reaction will generate arsenic acid (H 3 AsO 4 ), the slurry is cooled and filtered, and the filtrate is pumped into the reduction tank after fine filtration, and a certain concentration of SO is introduced at room temperature 2 Gas reduction crystallization (As 2 o 3 ), and the dried crystals are finished products of arsenic trioxide wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G28/00
Inventor 黄明金姜桂平肖珲欧阳辉杨兴文乐亮才赵向民朱晓宇余新华胡志荣刘标兵
Owner JIANGXI COPPER CORP
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