Treatment method of chemical nickel plating waste liquid

A technology of electroless nickel plating and treatment method, which is applied in chemical instruments and methods, metallurgical wastewater treatment, water/sewage treatment, etc. Cumbersome operation and other problems, to achieve the effect of being conducive to later reuse, reducing processing costs, and simple and convenient operation methods

Inactive Publication Date: 2020-05-19
中冶一局环境科技有限公司
View PDF8 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electroless nickel plating process, with the consumption of the plating solution, the composition of the plating solution changes and cannot be used normally. In addition to nickel sources such as nickel sulfate and nickel chloride, the nickel plating waste solution also contains a large amount of hypophosphite Complexing agents, organic acid complexing agents and other organic additives with different functions, so the electroless nickel plating waste liquid generally has a high COD, if it is directly discharged, it will cause great pollution to the environment, especially nickel not only pollutes, and caused huge losses
[0003] At present, the treatment process for electroless nickel plating waste liquid is mainly to oxidize the waste liquid w...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]A treatment method for electroless nickel plating waste liquid, comprising the following steps:

[0038] S1, nickel precipitation: take 1600ml of electroless nickel plating waste liquid, add oxalic acid to generate nickel oxalate in the electroless nickel plating waste liquid, the addition amount of oxalic acid is to take the supernatant and add a small amount of oxalic acid, the supernatant is transparent and colorless, after measurement, Add 50g of oxalic acid, heat at 90°C until the supernatant is transparent and colorless, filter; burn nickel oxalate to nickel oxide.

[0039] Calcium salt precipitation: add calcium chloride to the filtrate obtained after nickel precipitation filtration until the supernatant is added with calcium chloride, no precipitation is formed in the supernatant, after measurement, the amount of calcium chloride added is 160g, and sodium hydroxide is added to adjust The pH value of the waste liquid is 8, so that phosphite, organic acid, sulfate,...

Embodiment 2

[0044] A kind of processing method of electroless nickel plating waste liquid, carries out according to the method in implementing 1, and difference is:

[0045] S1. Nickel precipitation: After adding oxalic acid, heat at 85°C until the supernatant is transparent and colorless;

[0046] Calcium salt precipitation: the calcium salt added to the filtered filtrate in the nickel precipitation is calcium oxide, until the supernatant is added with calcium oxide, no precipitation is formed in the supernatant, and then sodium hydroxide is added to adjust the pH value to 9;

[0047] S2. Oxidation: adjust the pH value of the filtrate after the calcium salt precipitation operation to 4, and react with air for 1.5 hours;

[0048] Adding hydrogen peroxide with a concentration of 30wt% makes the concentration of hydrogen peroxide in the waste liquid 5ml / L, and the reaction time is 1.5h;

[0049] S3. Precipitation: adjust the pH value of the waste liquid to 9 with calcium hydroxide slurry, ...

Embodiment 3

[0051] A kind of processing method of electroless nickel plating waste liquid, carries out according to the method in implementing 1, and difference is:

[0052] S1. Nickel precipitation: After adding oxalic acid, heat at 100°C until the supernatant is transparent and colorless;

[0053] Calcium salt precipitation: Calcium hypochlorite is selected as the calcium salt added to the filtrate filtered in the nickel precipitation, until the supernatant is added with calcium hypochlorite, no precipitation is formed in the supernatant, and sodium hydroxide is added to adjust the pH value to 8 ;

[0054] S2. Oxidation: Take the filtrate after the calcium salt precipitation operation to adjust the pH value to 4, and let it react with air for 2.5 hours;

[0055] Adding hydrogen peroxide with a concentration of 30wt% makes the concentration of hydrogen peroxide in the waste liquid 15ml / L, and the reaction time is 2.5h;

[0056] S3. Precipitation: adjust the pH value of the waste liquid...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a treatment method of chemical nickel-plating waste liquid. The treatment method comprises the following steps: S1, nickel precipitation: adding a precipitant into the chemicalnickel-plating waste liquid to precipitate nickel, and filtering and separating the nickel; S2, oxidization: oxidizing hypophosphite and phosphite into orthophosphate by adopting an iron-carbon micro-electrolysis oxidation method,wherein the nickel ions are reduced into elemental nickel through iron, and the Fe<2+> is generated at the same time, then adding hydrogen peroxide to oxidize the Fe<2+>in the waste liquid is oxidized into Fe<3+>, and oxidize the hypophosphite and phosphite into orthophosphate, wherein the Fe<3+> and orthophosphate form an iron phosphate precipitate. The method hasthe advantages that nickel and phosphorus in the chemical nickel plating waste liquid can be separated through one-step treatment, so that the waste liquid reaches the national emission standard, andthe treatment method is simple and low in cost.

Description

technical field [0001] The invention relates to the technical field of waste liquid treatment, more specifically, it relates to a treatment method for electroless nickel plating waste liquid. Background technique [0002] Compared with the traditional electroplating technology, the chemical nickel plating technology has uniform coating thickness and does not need to provide power supply. Even if the plated part is not conductive, it can be nickel plated and has magnetism, etc. Now it is used in diamond micro powder nickel plating, electronic components and aerospace materials. Widely used in other fields. In the electroless nickel plating process, with the consumption of the plating solution, the composition of the plating solution changes and cannot be used normally. In addition to nickel sources such as nickel sulfate and nickel chloride, the nickel plating waste solution also contains a large amount of hypophosphite Complexing agents, organic acid complexing agents and o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F9/06C02F101/10C02F101/20C02F103/16
CPCC02F1/4672C02F1/5236C02F1/54C02F1/66C02F9/00C02F2101/105C02F2101/20C02F2103/16
Inventor 张孟星梁文先
Owner 中冶一局环境科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap