Electroplating sludge recycling technology

A technology of electroplating sludge and process, which is applied in the direction of sludge treatment, process efficiency improvement, water/sludge/sewage treatment, etc. It can solve the problems of high investment cost, unsuitable waste liquid disposal, etc., and achieve high purity and filtration Good detergency and detergency, uniform crystal particle size

Inactive Publication Date: 2014-10-15
ZHENJIANG HUAKE ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the initial investment cost is high, the smelting furnace needs to work continuously, and the production process will use non-clean energy coke, which is not suitable for the disposal of waste liquid

Method used

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  • Electroplating sludge recycling technology

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Embodiment Construction

[0030] In order to deepen the understanding of the present invention, the following drawings will further describe the present invention in detail. This embodiment is only used to explain the present invention, and does not constitute a limitation to the protection scope of the present invention.

[0031] see figure 1 As shown, the present invention provides an electroplating sludge recycling process: acid leaching, the electroplating waste liquid is first treated with a low-acid leaching process, and the leached residue is then subjected to high-acid leaching; iron removal, the electroplating waste liquid through acid leaching is treated with yellow sodium The ferrite method is used to remove iron, so that the iron content of the solution is less than 1 g / L. After iron removal, it is washed and filtered. The nickel hydroxide produced is washed by pressure filtration until the filtrate is colorless. The nickel hydroxide is dissolved with sulfuric acid, and the pH of the solutio...

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Abstract

The invention discloses an electroplating sludge recycling technology. The technology comprises the steps of acid dipping, iron removal, copper extraction, impurity removal, zinc extraction, nickel extraction, low acid leaching and high acid leaching, tailings are washed with water, the iron removal step is carried out through a sodium jarosite process, copper extraction adopts two stage extraction, two stage water washing, four stage back extraction, and second stage extraction is carried out after first stage extraction, precipitation, washing and acid dissolution. The technology has the advantages of technological period shortening, guarantee of the product purity through multiple stage extraction, effective use of the waste resource, and reduction of the emission of a waste liquid.

Description

technical field [0001] The invention relates to the field of renewable resources, in particular to an electroplating sludge recycling process. Background technique [0002] With the rapid development of my country's national economy and the continuous improvement of people's living standards, various renewable resources that can be recycled and utilized in the process of production and life are increasing. Vigorously carrying out recycling of renewable resources is one of the important ways to improve resource utilization efficiency, protect the environment, and establish a resource-saving society. Due to the development of the modern electronic industry, a large amount of waste liquid containing copper, zinc, nickel, etc. is produced. After these waste liquids are classified and treated, various slags containing copper, zinc, iron, etc. are produced. Millions of tons per year, of which copper, zinc, and nickel slag are the largest (accounting for more than 80% of the total...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/08C22B3/00C22B3/44C22B3/26C02F11/00C02F9/04C01G9/06C01G53/10C22B15/00C22B19/00C22B23/00C02F103/16
CPCY02P10/20
Inventor 奚玉
Owner ZHENJIANG HUAKE ENVIRONMENTAL PROTECTION TECH
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