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Method for processing chemical nickle-plating wastewater by breaking complexing twice

An electroless nickel plating and decomplexation technology, applied in chemical instruments and methods, metallurgical wastewater treatment, water/sewage multi-stage treatment, etc., can solve the problems of high treatment cost and poor treatment effect of ion exchange method and membrane separation method , to achieve the effects of easy automatic operation, reduced usage, and cost-saving processing

Inactive Publication Date: 2013-11-27
NANCHANG HANGKONG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for twice-broken complexation treatment of electroless nickel plating wastewater, which not only overcomes the problem of poor treatment effect of the existing chemical precipitation method, but also solves the high cost of ion exchange method and membrane separation method. It is very suitable for the treatment of electroless nickel plating wastewater in small and medium-sized enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] When the concentration of total nickel in the electroless nickel-plating wastewater is 22 mg / L, a complex breaking agent, calcium oxide I, is added to make the pH of the water sample = 8, and the reaction is stirred for 30 minutes. Then add complex breaking agent II barium chloride to the water sample to make the concentration 0.7g / L, and stir for 30min. Then add NaOH (4mol / L) to the water sample, adjust the pH of the water sample to 10, and react for 30 minutes. Then add flocculant PAM (0.3%) to promote its precipitation. After 60 minutes of precipitation, the solid and liquid were separated, and the total nickel in the supernatant was determined by flame atomic absorption spectrophotometry. The results are shown in Table 1.

[0018] Table 1 twice break complexation process electroless nickel plating wastewater (concentration of total nickel in the water sample is 22mg / L)

[0019] The concentration of total nickel in the water sample

[0020] The c...

Embodiment 2

[0022] When the concentration of total nickel in the electroless nickel-plating wastewater is 44 mg / L, add a complex breaking agent, calcium oxide I, to make the pH of the water sample = 8, and stir for 30 minutes. Then add the decomplexing agent II barium chloride to the water sample to make the concentration 1.6g / L, and stir for 30min. Then add NaOH (4mol / L) to the water sample, adjust the pH of the water sample to 10, and react for 30 minutes. Then add flocculant PAM (0.3%) to promote its precipitation. After 60 minutes of precipitation, the solid and liquid were separated, and the total nickel in the supernatant was determined by flame atomic absorption spectrophotometry. The results are shown in Table 2.

[0023] Table 2 double break complexing agent process electroless nickel plating waste water (concentration of total nickel in the water sample is 44mg / L)

[0024] The concentration of total nickel in the water sample

[0025] The present invention relates to...

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PUM

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Abstract

The invention provides a method for processing chemical nickel-plating wastewater by breaking complexing twice, which is characterized by comprising the following steps: (1) adding 0.5-2g of breaking complexing agent I to 1000ml of chemical nickel-plating wastewater, reacting for 15-50min under stirring; (2) adding 0.1-3g of breaking complexing agent II to 1000ml of chemical nickel-plating wastewater, reacting for 5-40min under stirring; and (3) adding alkali to the chemical nickel-plating wastewater, adjusting the pH value to be a range of 9-10, reacting for 15-50min under stirring, then adding flocculant, precipitating for 0.5-2h and yielding water. The invention has the following advantages: 1. favorable processing effect and improved processing efficiency which can fully achieve national discharge standard; 2. simple operation and convenient operation management; 3. low investment cost, lower operation cost, saved processing cost; and 4. strong practicability and wide application. The operation for processing chemical nickel-plating wastewater with double breaking complexing agent is simple and the operation management is convenient.

Description

technical field [0001] The invention relates to a method for nickel wastewater, in particular to a method for twice-complexation-breaking and treating electroless nickel-plating wastewater. Background technique [0002] Electroless plating plays an important role in surface treatment technology because of its low pollution, and it is one of the surface treatment technologies that has developed rapidly in recent years. Electroless nickel plating is the most widely used method in electroless plating. The electroless nickel plating layer has fine crystallization, low porosity, high hardness, uniform coating, good chemical stability, and the electroless nickel plating process is simple, practical, and has many superior characteristics. It has been widely used in electronics, machinery, precision instruments, Daily hardware and chemical industry. [0003] In order to improve the quality of electroless plating and the stability of the plating solution, a large amount of complexi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F103/16
Inventor 杨春平李姣罗胜联曾光明余关龙何慧军陈宏范长征刘环宇刘海洋
Owner NANCHANG HANGKONG UNIVERSITY