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Environmental protection treatment method for citric acid chemical plating waste water

A technology of environmental protection treatment and electroless plating, which is applied in metallurgical wastewater treatment, chemical instruments and methods, neutralized water/sewage treatment, etc., to achieve high economic and social benefits, shorten the treatment cycle, and solve the problem of COD emission standards.

Inactive Publication Date: 2009-11-04
丁四宜 +1
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Problems solved by technology

[0003] The purpose of this invention is to provide a kind of environmental protection treatment method of the citric acid electroless plating wastewater that can solve the defective of current treatment citric acid electroless plating wastewater method

Method used

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Embodiment Construction

[0014] Specific embodiments of the present invention are given below.

[0015] The environmental protection treatment method of citric acid electroless plating wastewater is to pump citric acid electroless plating wastewater into the reaction tank, add hydrochloric acid and adjust the pH value to 6, heat the reaction solution to 80°C, add calcium chloride, it is best to test it before the reaction According to the amount of nickel and cobalt ions in the waste water, add an appropriate amount of calcium chloride at one time according to the calculated amount of nickel and cobalt ions, and stir to make the reaction fully. Generally, stir and react for half an hour to one hour, and then carry out vacuum filtration Or pressure filtration, the filter residue is calcium citrate, and the filtrate is nickel chloride, cobalt chloride solution and remaining citric acid and organic matter mixture;

[0016] The filtrate is put into another reaction cylinder, add sodium sulfide (the amount...

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Abstract

The environmental protection treatment method of citric acid electroless plating wastewater is to add hydrochloric acid and calcium chloride to citric acid electroless plating wastewater, perform vacuum filtration or pressure filtration after the reaction, add sodium sulfide to the filtrate to fully react and then perform pressure filtration, and the filter residue is nickel, The cobalt sulfide is precipitated, and the filter residue is recovered as a mineral product; the COD of the final separated filtrate is measured, and if the COD value has not reached the emission standard, conventional biochemical treatment is carried out until the emission standard is met. The beneficial effect of the invention is that the treatment period is greatly shortened, and valuable nickel and cobalt products are effectively recovered, the problem of COD discharge of waste water up to the standard is better solved, and the invention has high economic and social benefits.

Description

technical field [0001] The invention relates to an environmental protection treatment method for waste liquid, in particular to a method for treating waste water after citric acid electroless plating is performed on electronic materials. Background technique [0002] In the production process of some electronic materials, citric acid electroless plating is used, such as plating nickel, cobalt and other heavy metals on the surface of electronic materials. Wastewater treatment after electroless plating The current common treatment method in the industry is to oxidize and decompose organic matter such as citric acid through biochemical treatment such as surface aeration, and then use chemical methods to put in drugs to precipitate heavy metals such as nickel and cobalt together with biochemical sludge , and then recover and process the precipitate by pressure filtration. Because heavy metals such as nickel and cobalt form highly stable complexes with citric acid, and the high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/86C02F9/04C02F1/66C01G53/11C02F103/16
Inventor 王水平丁四宜
Owner 丁四宜
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