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Method for separating nickel, copper and iron from electroplating sludge

A technology for electroplating sludge and nickel-copper-iron, which is applied in the direction of improving process efficiency, can solve the problems such as the leaching rate of copper and nickel needs to be improved, and achieves the effect of solving difficult iron removal, good decomposition effect and simple operation.

Active Publication Date: 2016-07-20
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

Cheng Jiehong et al. (Recovering copper and nickel in electroplating sludge by ammonia immersion-pressurized hydrogen reduction method, "Environmental Science and Technology", Vol.33, No.6E, P135-138, 2010) used electroplating in the process of electroplating wastewater treatment Sludge was used as raw material, and copper, nickel, nickel, copper, and zinc were separated from electroplating sludge by ammonia leaching-pressurized hydrogen reduction method, and the leaching rates were 80.25%, 77.42%, and 91.07%, respectively, and metal copper powder and Nickel powder, but the leaching rate of copper and nickel needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Electroplating sludge composition: Ni14.14%, Cu1.0%, Zn9.09%, Co0.24%, Fe5.21%, Mg0.09%, Mn0.03%, Al0.08%, Cd0.07%, S23.86%.

[0016] Add 500g of electroplating sludge and 2500g of sulfuric acid solution with a concentration of 90g / L into the reaction kettle, add 0.6g of lignosulfonate, feed industrial oxygen, keep the oxygen partial pressure in the kettle at 0.7MPa, leaching temperature at 150°C, and control the pH of the leaching solution In 1.5, the leaching time is 3h. After the leaching is over, filter and separate to obtain the leaching solution and leaching residue; the leaching residue is 97.20g after drying. After analysis, the yield of the leaching residue is 19.44%, of which Fe24.99%, Ni0.47% , Cu0.054%, S68.21%, the calculation shows that the leaching rate of nickel and copper is greater than 98%, the leaching rate of iron is 25.94%, and the leaching rate of sulfur is 44.43%. The leaching solution is 4L in total, in which nickel ion concentration is 17.56g / ...

Embodiment 2

[0018] The electroplating sludge composition is the same as in Example 1.

[0019] Add 500g of electroplating sludge and 1250g of sulfuric acid solution with a concentration of 250g / L into the reaction kettle, add 1.5g of lignosulfonate, feed industrial oxygen, keep the oxygen partial pressure in the kettle at 0.3MPa, leaching temperature at 150°C, and control the pH of the leaching solution In 1.4, the leaching time is 1h. After the leaching is over, filter and separate to obtain the leaching solution and leaching residue; the leaching residue is 157.85g after drying. After analysis, the yield of the leaching residue is 31.57%, of which Fe13.52%, Ni0.53% , Cu0.048%, S56.99%, the calculation shows that the leaching rate of nickel and copper is greater than 98%, the leaching rate of iron is 18.08%, and the leaching rate of sulfur is 24.59%. The leaching solution is 3L in total, in which nickel ion concentration is 23.29g / L and copper ion concentration is 1.64g / L.

Embodiment 3

[0021] The electroplating sludge composition is the same as in Example 1.

[0022] Add 500g of electroplating sludge and 1,500g of sulfuric acid solution with a concentration of 220g / L into the reaction kettle, add 1.2g of lignosulfonate, and introduce industrial oxygen to keep the oxygen partial pressure in the kettle at 0.4MPa, the leaching temperature is 110°C, and the pH of the leaching solution is controlled At 1.0, the leaching time was 5 hours. After the leaching was completed, the leachate and leaching residue were obtained by filtration and separation; the leaching residue was 134.40 g after drying. After analysis, the yield of leaching slag is 26.88%, of which Fe17.09%, Ni0.42%, Cu0.044%, S61.03%, the calculation shows that the leaching rate of nickel and copper is 98%, and the leaching rate of iron is 11.83% , The sulfur leaching rate is 31.25%. The leaching solution is 3L in total, with nickel ion concentration of 23.37g / L and copper ion concentration of 1.65g / L. ...

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Abstract

The invention relates to a method for separating nickel, copper and iron from electroplating sludge. The method includes the following steps that a sulfuric acid solution and lignosulfonate are added into the electroplating sludge according to the mass ratio of the electroplating sludge to the sulfuric acid solution to the lignosulfonate being 1:2-5:0.002-0.005,and oxygen is led in, wherein the oxygen partial pressure ranges from 0.3 MPa to 0.7 MPa, the leaching temperature ranges from 100 DEG C to 150 DEG C, the pH of a leaching agent is controlled to range from 0.5 to 1.5, and the leaching time ranges from 1 hour to 5 hours; and after leaching is finished, filtering separation is carried out to obtain the leaching agent and leaching residues, the copper and the nickel are extracted through the leaching agent, and the leaching residues are stacked and accumulated. The method is easy to operate, and the aims of selective leaching of elements such as the copper and the nickel and separation of the iron can be further achieved. The leaching efficiency of the elements such as the copper and the nickel is high, and the decomposing effect is good. The method is suitable for treatment and utilization of the electroplating sludge.

Description

technical field [0001] The invention relates to a method for separating nickel-copper-iron from electroplating sludge. technical background [0002] Electroplating sludge is a toxic and harmful substance containing heavy metals such as copper, nickel, iron, cobalt, zinc, elemental sulfur, and cyanide. It is also an important valuable resource. [0003] The resource utilization of electroplating sludge has always been a research hotspot at home and abroad, but there are many types of electroplating industries, and the electroplating sludge produced has complex components, heavy metal content and existing forms, and the comprehensive treatment technology of electroplating sludge is difficult. At present, the treatment of electroplating sludge mainly includes simple landfill, incineration by incineration, electric repair, biotechnology of Thiobacillus ferrooxidans or Thiobacillus thiooxidans, chemical treatment and ion exchange of removing heavy metals by using phosphoric acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B23/00
CPCC22B7/007C22B15/0071C22B23/043Y02P10/20
Inventor 曹洪杨邱显扬刘志强郭秋松李伟张魁芳高远朱薇金明亚
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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