Method for separating and recovering copper, nickel and iron from electroplating sludge

A technology for electroplating sludge, separation and recovery, which is applied in the field of solid waste resource utilization, can solve the problems of difficult sludge disposal, and achieve the effects of short process, simple operation and low basic investment.

Inactive Publication Date: 2014-08-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a method for recovering useful metals from electroplating sludge containing copper, iron and nic

Method used

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  • Method for separating and recovering copper, nickel and iron from electroplating sludge

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Experimental program
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Effect test

Embodiment 1

[0020] Add 200 mL of 1 mol / L sulfuric acid solution to 20 g of dried electroplating sludge, dissolve for 3 hours, and filter the leaching solution that contains Cu 2+ 、Ni 2+ The solution was adjusted to pH 3 with NaOH, allowed to settle for 8 hours, and 93% ferric hydroxide precipitate was obtained after filtration. Sodium hydroxide was used to adjust the pH of the filtrate to 7, and the precipitate was allowed to stand for 3 hours, and the filtered precipitate was washed three times with deionized water (liquid-solid ratio 20). The precipitate and deionized water are mixed with a liquid-solid ratio of 20, and the pH is adjusted to 9 with NaOH. After adding glycerol with 1.2 times the stoichiometric number of copper ions in the precipitate and stirring, a deep blue solution is formed, and after filtration, nickel hydroxide is obtained. Precipitate; The purple blue solution that obtains is the copper hydroxide solution that adds 1mol / L sulfuric acid to adjust pH 7 to regenerat...

Embodiment 2

[0022] Add 200 mL of 5 mol / L sulfuric acid solution to 20 g of dried electroplating sludge, dissolve for 3 hours, and filter the leaching solution that contains Cu 2+ 、Ni 2+ The solution was adjusted to pH 5 with NaOH, left to settle for 24 hours, and 95% ferric hydroxide precipitate was obtained after filtration. Sodium hydroxide was used to adjust the pH of the filtrate to 8, and the precipitate was allowed to stand for 5 hours, and the filtered precipitate was washed three times with deionized water (liquid-solid ratio 20). The precipitate and deionized water are mixed with a liquid-solid ratio of 20, and the pH is adjusted to 11 with NaOH. After adding glycerol with 1.6 times the stoichiometric number of copper ions in the precipitate and stirring, a deep blue solution is formed, and after filtration, nickel hydroxide is obtained. Precipitate; The purple blue solution that obtains is glycerol copper solution and adds 5mol / L sulfuric acid to adjust pH=8 and regenerates and...

Embodiment 3

[0024] Add 200mL of 3mol / L sulfuric acid solution to 20g of dried electroplating sludge, dissolve for 5h, and filter the leaching solution that contains Cu 2+ 、Ni 2+ The solution was adjusted to pH 4 with NaOH, left to settle for 15 hours, and 92% ferric hydroxide precipitate was obtained after filtration. Sodium hydroxide was used to adjust the pH of the filtrate to 7.5, and the precipitate was allowed to stand for 4 hours, and the filtered precipitate was washed 3 times with deionized water (liquid-solid ratio 20). The precipitate and deionized water are mixed with a liquid-solid ratio of 20, and the pH is adjusted to be 10 with NaOH. After adding glycerol with 1.4 times the stoichiometric number of copper ions in the precipitate and stirring, a deep blue solution is formed, and after filtration, nickel hydroxide is obtained. Precipitate; The purple blue solution that obtains is glycerol copper solution and adds 3mol / L sulfuric acid to adjust pH=7.5 and regenerates precipit...

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Abstract

The invention relates to a method for separating and recovering copper, nickel and iron from electroplating sludge. The method mainly comprises the following steps: first, dissolving the electroplating sludge, and removing ferric ions in the form of a ferric hydroxide precipitate by adjusting the pH; second, forming the precipitates of the copper and the nickel by adjusting the pH, washing and filtering the precipitates, adding glycerol to form crimson blue glycerin copper solution to realize the separation of the copper form the nickel, and separating copper hydroxide precipitate from the separated crimson blue solution by adjusting the pH; third, washing the copper hydroxide precipitate obtained in the second step and dissolving the washed copper hydroxide precipitate by using sulfuric acid to obtain nickel sulfate solution, and evaporating the nickel sulfate to obtain acidic nickel sulfate. According to the method, the problem that the copper, the nickel and the iron in the electroplating sludge are difficult to recover when the copper, the nickel and the iron coexist is solved, and the corresponding recovery products are respectively obtained by fully utilizing the difference among the chemical properties of the copper, the nickel and the iron; the method has the advantages of short process flow, easiness in operation and high recovery rate.

Description

technical field [0001] The invention relates to the field of resource utilization of solid waste, in particular to a method for separating and extracting valuable metals from electroplating sludge containing copper, iron and nickel. Background technique [0002] Electroplating sludge is the solid waste generated during the treatment of electroplating wastewater and waste electroplating solutions in the electroplating production process. Because it usually has the characteristics of high moisture content, various heavy metals, and easy leaching, it is It is easy to pose a serious threat to the surrounding environment. Electroplating sludge contains a variety of metal components, and the content is relatively high, so electroplating sludge is a cheap renewable resource. It is a very meaningful work to separate and recover valuable metal components from electroplating sludge, not only It can safely dispose of electroplating sludge, which is prone to pollution, and can also rec...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B23/00C21B15/00
CPCY02P10/20
Inventor 李琴毛林强安浩崔皓苗琛琛翟建平
Owner NANJING UNIV
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