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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

Active Publication Date: 2021-08-10
ZHEJIANG HI TECH ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The object of the present invention is to overcome the defective in the prior art, and provide a kind of oxidation method of hypophosphite in electroless nickel plating waste liquid, method of the present invention can be hypophosphite oxidation to phosphite rather than direct oxidation to positive Phosphate, which solves the shortcomings of incomplete oxidation, non-selective oxidation and high processing cost in the current hypophosphite oxidation process

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

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Embodiment 1

[0053] The influent water is electroless nickel plating waste liquid from an electroplating sewage treatment plant in Zhejiang. The waste liquid water enters this process section after being treated by an ultrafiltration membrane. The flow rate of the waste liquid is 10m 3 / d, the concentration of hypophosphite (in P) in the waste liquid is 500mg / L, and the pH value is 4.5. The pH value of the waste liquid was adjusted to 1.7 with hydrochloric acid, and then mixed with hydrogen peroxide (the amount of hydrogen peroxide added was 12 mL / L) to obtain pretreated wastewater. Through the formula of the above-mentioned activated carbon column preparation method and the relationship between each other, the amount of iodine adsorbed by activated carbon is 0.07g iodine element / g activated carbon. Two groups of activated carbon columns operate in parallel, and each group is connected in series by four activated carbon columns. The inner diameter of the activated carbon column is 390mm, h...

Embodiment 2

[0056] The influent water is electroless nickel plating waste liquid from an electroplating sewage treatment plant in Zhejiang. The waste liquid water enters this process section after being treated by an ultrafiltration membrane. The flow rate of the waste liquid is 10m 3 / d, the concentration of hypophosphite (in P) in the waste liquid is 500mg / L, and the pH value is 4.5. The waste liquid was adjusted to a pH value of 1.6 with hydrochloric acid, and then mixed with hydrogen peroxide (the amount of hydrogen peroxide added was 12 mL / L) to obtain pretreated wastewater. The amount of iodine pretreatment adsorbed by activated carbon is 0.07g iodine element / g activated carbon. There are two groups of activated carbon columns running in parallel. Each group consists of four activated carbon columns connected in series. Up-out method, each group of water flow 0.5m 3 / h.

[0057] Pass the pretreated wastewater into the activated carbon column treatment unit for post-treatment for 1...

Embodiment 3

[0059] The influent water is electroless nickel plating waste liquid from an electroplating sewage treatment plant in Zhejiang. The waste liquid water enters this process section after being treated by an ultrafiltration membrane. The flow rate of the waste liquid is 10m 3 / d, the concentration of hypophosphite (in P) in the waste liquid is 500mg / L, and the pH value is 4.5. The pH value of the waste liquid was adjusted to 1.8 with hydrochloric acid, and then mixed with hydrogen peroxide (the amount of hydrogen peroxide added was 12 mL / L)) to obtain pretreated wastewater. The amount of iodine pretreatment adsorbed by activated carbon is 0.07g iodine element / g activated carbon. There are two groups of activated carbon columns running in parallel. Each group consists of four activated carbon columns connected in series. Up-out method, each group of water flow 0.5m 3 / h.

[0060] Pass the pretreated wastewater into the activated carbon column treatment unit for post-treatment fo...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/10C02F103/16
CPCC02F1/281C02F1/66C02F1/70C02F1/722C02F9/00C02F2001/007C02F2101/105C02F2103/16
Inventor 张世新吴玉华刘国庆林金威余华东金素素陈新才许海亮
Owner ZHEJIANG HI TECH ENVIRONMENTAL TECH
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