Treatment method of chemical nickel plating waste liquid

A technology of electroless nickel plating and treatment method, applied in chemical instruments and methods, metallurgical wastewater treatment, oxidized water/sewage treatment, etc., can solve the problems of up to standard treatment, difficult treatment of chemical nickel plating, etc., and achieve the effect of efficient removal

Pending Publication Date: 2021-02-19
BEIJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is not easy to efficiently recover nickel and phosphorus from the electroless nickel plating waste solution (i.e. the waste water produced in the electroless nickel plating production process); The strong complexation of the mixture; ②The electroless nickel plating waste solution contains high concentrations of phosphorus in various complex forms, such as +1-valent sodium hypophosphite, +3-valent sodium phosphite, +5-valent sodium phosphate, etc. Phosphorus-containing compounds; the above reasons make it difficult to treat electroless nickel plating, and it is difficult to treat it up to standard

Method used

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  • Treatment method of chemical nickel plating waste liquid

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Experimental program
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Effect test

Embodiment 1

[0038] Get 250 milliliters of electroless nickel-plating waste liquids respectively, element Ni is 3600mg / L in the waste liquid after measuring, and element P is 56400mg / L, and pH is 1.2. Add 50% sodium hydroxide to adjust the pH of the electroless nickel plating waste solution to 2, 4, 6, 7, 8, 9 respectively. Follow S 2- / Ni 2+ The molar ratio of the solution is 0.8:1. Sodium hydrosulfide is added to precipitate the nickel for the first time, and an appropriate amount of PAM is used to accelerate the coagulation. After the nickel sediment is separated from the solid and liquid by centrifugation, the residual nickel concentration in the solution is measured. The results are shown in Table 1.

[0039] Table 1 Residual nickel concentration after sodium hydrosulfide nickel precipitation under different pH conditions

[0040] pH 2 4 6 7 8 9 Residual nickel concentration mg / L 2970 1620 1180 797 708 555 Removal rate% 17.5 55.0 67.2 77.86 80.3 ...

Embodiment 2

[0043] Get 250 milliliters of electroless nickel-plating waste liquids respectively, element Ni is 3600mg / L in the waste liquid after measuring, and element P is 56400mg / L, and pH is 1.2. Add 50% sodium hydroxide to adjust the pH of the electroless nickel plating waste solution to 7. Follow S 2- / Ni 2+ The molar ratios are 0.42:1, 0.56:1, 0.73:1, 0.80:1, 0.88:1, 0.96:1, 1.05:1, 1.12:1, 1.22:1, add sodium hydrogen sulfide to make the initial precipitation of nickel and use An appropriate amount of PAM was used to accelerate the coagulation, and after the nickel sediment was separated from solid and liquid by centrifugation, the residual nickel concentration in the solution was measured. The results are shown in Table 2.

[0044] Table 2 The relationship between the amount of sodium hydrosulfide added and the concentration of residual nickel under the condition of pH 7

[0045]

Embodiment 3

[0047] Get 250 milliliters of electroless nickel plating waste liquids respectively, element Ni is 5000mg / L in the waste liquid after measuring, element P is 50000mg / L, and pH is 4.0. Add 50% sodium hydroxide to adjust the pH of the electroless nickel plating waste solution to 7.0. Follow S 2- / Ni 2+ The molar ratio of the solution is 1:1, sodium hydrosulfide is added to precipitate the nickel for the first time, and an appropriate amount of PAM is used to accelerate the coagulation. After the nickel sediment is separated from the solid and liquid by centrifugation, the residual nickel concentration in the solution is measured. Then add an appropriate amount of ethyl disulfide nitrogen, the solution becomes colorless, the second step of nickel precipitation and the second solid-liquid separation. The high phosphorus-containing organic acid solution after nickel removal was vacuum evaporated and concentrated to a solid content of 50%. Take 2.0 g of the concentrated high-phos...

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Abstract

The invention relates to a treatment method of waste liquid, in particular to a treatment method of chemical nickel plating waste liquid. The treatment method comprises the following steps of: removing nickel from the chemical nickel plating waste liquid to be treated to obtain a first treatment liquid; and concentrating the first treatment liquid until the solid content is more than 20%, and carrying out high-temperature oxidation under the conditions that the oxygen concentration is 20-100% and the temperature is 300-1200 DEG C. According to the treatment method provided by the invention, low-valence phosphorus (namely monovalent hypophosphite and trivalent phosphite) in the chemical nickel plating waste liquid can be completely oxidized into pentavalent phosphate with biological effectiveness, so that resource recycling is realized; meanwhile, the nickel in the chemical nickel plating waste liquid can be efficiently removed, so that resource utilization of the nickel in the waste liquid is realized; and the removal rate of nickel is as high as 99.99%.

Description

technical field [0001] The invention relates to a treatment method of waste liquid, in particular to a treatment method of electroless nickel plating waste liquid. Background technique [0002] In recent years, the electroplating industry has developed rapidly. Among them, electroless nickel plating, as a new type of metal surface treatment technology, has attracted increasing attention from researchers due to its advantages of simple process, energy saving, and environmental protection. Immersion nickel is a surface treatment process widely used in the circuit board industry. This process is mainly to electrolessly plate a layer of nickel on the copper surface of the circuit board. However, the electroless nickel plating waste liquid contains up to 2000-5000mg / L of nickel and 80000-200000mg / L of phosphorus. Nickel has carcinogenic and sensitizing effects, which can lead to skin cancer, lung cancer and nasal cavity cancer. At present, heavy metal nickel and its compounds ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01B25/26C02F101/20C02F103/16C02F101/10C02F101/30
CPCC01B25/26C02F1/00C02F1/001C02F1/02C02F1/38C02F1/56C02F1/66C02F1/74C02F9/00C02F2001/007C02F2101/105C02F2101/20C02F2101/30C02F2103/16C02F2209/02C02F2209/06
Inventor 郭学军冷思文马娜张翔垣郑子杰孙悦
Owner BEIJING NORMAL UNIVERSITY
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