Efficient separation device for hypophosphite/phosphite in chemical nickel plating waste liquid

Abstract

The invention discloses an efficient separation device for hypophosphite / phosphite in chemical nickel plating waste liquid. The efficient separation device comprises a chemical nickel plating waste liquid storage pool, a hypophosphite / phosphite concentrated solution storage pool, a cleaning solution and waste liquid storage pool and an electrodialysis membrane stack assembly, wherein a first electrodialysis membrane stack and a second electrodialysis membrane stack which can move up and down are arranged in the electrodialysis membrane stack assembly. According to the device, the first electrodialysis membrane stack and the second electrodialysis membrane stack move up and down to realize alternate switching between separation treatment and membrane stack cleaning, so relatively high membrane separation efficiency of the electrodialysis membrane stack assembly can be kept at any time, and continuous operation of the separation device is not influenced.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment and recycling, in particular to a high-efficiency separation device for secondary / phosphite in electroless nickel plating waste liquid. Background technique [0002] Due to its comprehensive physical and chemical properties such as excellent uniformity, hardness, wear resistance and corrosion resistance, electroless nickel plating has been widely used in aerospace, automobile, pump manufacturing, valve manufacturing and other industrial fields; the treatment of electroless nickel plating waste liquid is also It has gradually become an important issue in production practice; the electroless nickel plating waste liquid contains a large amount of heavy metal nickel, organic complexes, hypo / phosphite, etc. Once these toxic and harmful substances enter the environment, they will inevitably cause harm to human health and the environment. extremely serious hazard. [0003] At pre...

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Problems solved by technology

[0003] At present, the most commonly used methods for the treatment of electroless nickel plating waste liquid are chemical precipitation method, Fenton method, electrolytic method, etc., although chemical precipitation method and electric Fenton method can effectively remove nickel ions and secondary / sub- Phosphate ions, but a large amount of sludge will be produced, which requires further professional treatment. The use of electrolysis can realize the recycling of nickel in waste liquid, but there is still the problem of waste of phosphorus resources in waste liquid

[0004] In the actual engineering application process, the separation of nickel and phosphorus is a key link to realize the recycling of phosphorus resources in the electroless nickel plating waste liquid. If the separation is not complete, the recovered phosphorus-containing products are mixed with certain heavy metal nickel, which will seriously affect Applications of Recycled Phosphorus-Containing Products

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