A kind of treatment method of hypophosphite in electroless nickel plating waste liquid

A hypophosphite and treatment method technology, applied in chemical instruments and methods, metallurgical wastewater treatment, neutralization water/sewage treatment, etc., can solve the problems of non-selective oxidation, incomplete oxidation, high treatment cost, etc., and achieve a high degree of selectivity High efficiency, low treatment cost, and high oxidation efficiency
CN112158978BActive Publication Date: 2021-08-10ZHEJIANG HI TECH ENVIRONMENTAL TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG HI TECH ENVIRONMENTAL TECH
Publication Date
2021-08-10

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Abstract

The invention discloses a method for treating hypophosphite in electroless nickel plating waste liquid, which is specifically as follows: remove the suspended matter from the electroless nickel plating waste liquid to be treated, adjust the pH value to 1.6-1.8, and then mix it with hydrogen peroxide to obtain the pretreated Treating wastewater; passing the pretreated wastewater into an activated carbon column that has absorbed elemental iodine for treatment, the hypophosphite in the pretreated wastewater is oxidized to phosphite by the elemental iodine, and the elemental iodine is reduced to iodide ions at the same time, and the reduced Iodide ions are oxidized by hydrogen peroxide to simple iodine, which is re-adsorbed by activated carbon for reuse; phosphite in the treated wastewater is further removed by precipitation. The treatment method of the invention can control the transformation of hypophosphite into phosphite instead of forming orthophosphate, has high selectivity in oxidation, greatly reduces the consumption of oxidizing agent, and has high oxidation efficiency.
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Description

technical field

[0001] The invention relates to the field of complex heavy metal wastewater treatment technology, and more specifically, relates to a method for treating hypophosphite in electroless nickel plating waste liquid. Background technique

[0002] Electroless nickel plating solution is mainly composed of nickel salt, complexing agent, reducing agent and additives. Nickel salt is the main salt of the plating solution. Generally, nickel sulfate is used, followed by nickel chloride, and nickel acetate and nickel carbonate. At the same time, it can prevent the precipitation of hydroxide and phosphite; the reducing agent is generally sodium hypophosphite, which is used to provide active hydrogen atoms through catalytic dehydrogenation, and reduce nickel ions to metallic nickel.

[0003] The huge electroless plating industry not only promotes the rapid development of modern industry, but also brings serious environmental pollution problems. Periodically scrapped electro...

Claims

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