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

A technology of electroless nickel plating and treatment device, applied in chemical instruments and methods, metallurgical wastewater treatment, neutralized water/sewage treatment, etc. The effect of high oxidation efficiency and easy control of process operation

Active Publication Date: 2022-07-12
ZHEJIANG HI TECH ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, phosphite can also react with calcium ions or iron ions to form precipitates and remove them. However, the existing hypophosphite oxidation processes directly oxidize it to orthophosphate. There is no selectivity in the oxidation process, and the treatment cost is high. Incomplete oxidation of phosphate

Method used

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

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Effect test

Embodiment 1

[0060] The device and method of the present invention are used to treat the chemical nickel plating waste liquid collected separately in a sewage treatment plant in an electroplating park. The daily water treatment capacity is 50t, the hypophosphite content is 460mg / L, and the operation time of the device is 12h / d.

[0061] The electroless nickel plating waste liquid to be treated is first subjected to ultrafiltration treatment by the ultrafiltration treatment unit to intercept the suspended solids and macromolecular organic substances in the waste liquid, and then enter the reaction unit. The reaction unit is two main reactor groups running in parallel, each group has 5 main reactors connected in series, and each main reactor is detachably equipped with 6 activated carbon columns. The diameter of each activated carbon column is 0.4m, and the packing height of granular activated carbon is 1.5m. All activated carbon columns were removed and inverted every week of operation of ...

Embodiment 2

[0063] A sewage treatment plant in an electroplating park in Zhejiang has always used sodium hypochlorite for oxidation treatment of the electroless nickel plating waste liquid discharged from the workshop. After transformation, the device of the present invention is used for treatment. The daily water treatment capacity is about 12t, the hypophosphite content is 450-550mg / L, and the operation time of the device is 9h / d.

[0064] The electroless nickel plating waste liquid to be treated is first subjected to ultrafiltration treatment by the ultrafiltration treatment unit to intercept the suspended solids and macromolecular organic substances in the waste liquid, and then enter the reaction unit. The reaction unit is two main reactor groups running in parallel, each group has 2 main reactors connected in series, and each main reactor is detachably equipped with 6 activated carbon columns. The diameter of each activated carbon column is 0.4m, and the packing height of granular a...

Embodiment 3

[0066] An electroplating sewage treatment plant conducts centralized treatment of chemical nickel wastewater discharged from multiple production workshops. The wastewater is first discharged into a regulating tank, and then treated by the device of the present invention. The average amount of water entering the device is 70t / d, and the hypophosphite concentration in the influent is about 750mg / L. In the design process, considering that the daily treatment capacity is large and the activated carbon required is more, a sodium filtration treatment unit is added after the ultrafiltration treatment unit, and the effluent enters the reaction unit after passing through the dosing unit. The reaction unit is 11 main reactor groups operating in parallel, and each group has two main reactors connected in series. The main reactor is detachably equipped with 6 activated carbon columns. The diameter of each activated carbon column is 0.4m, and the packing height of granular activated carbo...

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Abstract

The invention discloses a device for treating hypophosphite in chemical nickel-plating waste liquid and a method thereof. The device comprises an ultrafiltration treatment unit, a dosing unit and a reaction unit which are connected in sequence through pipelines; the reaction unit includes a plurality of connected main reactions The bottom of the reaction chamber is provided with a water inlet, and the top is provided with a water outlet; the inner cavity is axially divided into a water inlet area, a reaction area and a water outlet area by the first sealing plate and the second sealing plate; The two sealing plates are respectively provided with a number of through first holes and second holes at the same position, and an activated carbon column is detachably fixed between the first holes and the second holes at the same position; the upper head and the first sealing plate are disassembled After the activated carbon column can be taken out. In the present invention, by regularly placing the activated carbon column upside down, the iodine element can be prevented from being separated from the activated carbon column during the migration process of the water flow, thereby causing loss and loss. The device of the invention is simple in structure, easy to maintain, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of complex heavy metal wastewater treatment, and in particular relates to a device and a method for treating hypophosphite in chemical 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. Nickel sulfate is generally used, followed by nickel chloride, and nickel acetate and nickel carbonate. At the same time, it can prevent the precipitation of hydroxide and phosphite; sodium hypophosphite is generally used as the reducing agent, and its function is 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/10C02F103/16
CPCC02F9/00C02F2101/105C02F2103/16C02F1/444C02F1/66C02F1/766C02F1/281C02F1/442Y02P10/20
Inventor 张世新何晓洁张浩俊杨青林金威刘国庆井任金素素楼洪海
Owner ZHEJIANG HI TECH ENVIRONMENTAL TECH
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