Method for recovering copper and nickel from electroplating sludge

A technology for electroplating sludge and recovering copper, applied in the direction of improving process efficiency, can solve the problems of difficult implementation, long process route, unstable operation, etc., and achieve the effects of significant economic and social benefits, simple process, and convenient operation.

Active Publication Date: 2013-09-11
HUIZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the actual industrial application of the above research results, there are problems such as long process route

Method used

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  • Method for recovering copper and nickel from electroplating sludge

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Embodiment

[0030] The process flow chart of this embodiment is as figure 1 As shown, its technological process is carried out in the following steps:

[0031] (1) Acid leaching: Slurry the electroplating sludge with a small amount of water, then slowly add sulfuric acid, control the pH value of the solution to 1.5, and the temperature is 20-40 ° C, leaching for 1-2 hours;

[0032] (2) Separation of copper and nickel: Add sodium sulfide to the acid leaching solution to separate copper and nickel. The amount of sodium sulfide added is 1.0-1.2 times the theoretical amount of copper precipitation, the temperature is maintained at 40-80°C, and the reaction time is 20-60 minutes;

[0033] (3) Filter, wash and dry the filter residue, combine the lotion and filtrate and transfer to the next process;

[0034] (4) Impurity removal: adjust the pH value of the solution to 5-7 with ammonia water to precipitate iron and chromium; heat the solution to 85-100°C, add a certain amount of sodium fluoride,...

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Abstract

The invention relates to a treatment method for electroplating sludge, especially to a method for recovering copper and nickel from electroplating sludge. The method comprises the following steps: (1) acid leaching; (2) separation of copper from nickel: a step of adding a sulfide into a leachate of acid leaching obtained in the previous step so as to obtain a copper sulphide precipitate; (3) filtration to separate copper sulphide and a precipitate mother liquor; (4) removal of impurities; (5) filtration to separate a filter residue containing iron, chromium, calcium and magnesium and mother liquor containing nickel; and (6) evaporation and crystallization of nickel sulfate: a step of adding a sodium carbonate solution while stirring the mother liquor containing nickel until a supernatant becomes clear, controlling the pH value of a solution to be 7.5 to 9.0, carrying out standing, filtering and washing, then dissolving a sediment with sulfuric acid, controlling the pH value at an end point to be 3 to 6 and carrying out evaporation and crystallization so as to obtain a nickel sulfate product. According to the invention, the recovery rate of copper is more than 90%, the recovery rate of nickel is more than 80%, and waste water produced in the method reaches an emission standard.

Description

technical field [0001] The invention relates to a treatment method for electroplating sludge, in particular to a method for recovering copper and nickel from electroplating sludge. Background technique [0002] The electroplating production process has been widely used in aerospace, navigation, transportation, machine manufacturing, daily hardware, household appliances, textiles and other industries. In the electroplating process, the cleaning of the plated parts, the filtration of the plating solution, the discarding and renewal of the plating solution, and the taking out, running, escaping, dripping, and leaking of the plating solution cause a large amount of wastewater to be discharged by the electroplating enterprise. With the increasing awareness of human environmental protection, the pollution problem of electroplating wastewater has attracted more and more attention and attention. The chemical precipitation method is commonly used at home and abroad to treat electrop...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C22B15/00
CPCY02P10/20
Inventor 王春花
Owner HUIZHOU UNIV
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