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Alkaline zinc-nickel alloy wastewater treatment method

The technology of a zinc-nickel alloy and a treatment method is applied in the fields of organic complexes, the treatment of removing nickel ions, and the treatment of alkaline zinc-nickel alloy wastewater, which can solve the problems of difficulty in the treatment of heavy metal nickel, high cost, poor effect, etc. Significant environmental and economic benefits, reduction of CODCr value, and broad application prospects

Active Publication Date: 2018-07-06
NANJING YUANQUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of difficulty in the standard treatment of heavy metal nickel in alkaline zinc-nickel alloy wastewater, poor effect and high cost, and proposes a treatment method for alkaline zinc-nickel alloy wastewater

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] Take 1L of alkaline zinc-nickel alloy wastewater produced by an electroplating workshop with pH=13, and its COD was measured Cr Concentration is 10124mg / L, nickel content is 58mg / L (heavy metal content of the present invention is total content), waste water is put into reactor, adds nitric acid and regulates waste water pH value to pH=8.0, by molar ratio 0 3 :COD cr = The amount of 1.2:1 is passed into ozone for decomplexation treatment, and the reaction time is 1h. The solid insoluble matter is generated through the complexation reaction, and the solid-liquid separation is carried out to obtain the solid insoluble matter and the filtrate. Nitric acid is added to the filtrate to adjust the pH value of the wastewater to pH=3.0, and copper sulfate and ferrous sulfate are added. The molar ratio of the two is Cu 2+ :Fe 2+ =1:5, according to molar ratio H 2 o 2 :COD cr The amount of =0.6:1 added concentration is the hydrogen peroxide of 30% (mass fraction), wherein the ...

Embodiment 2

[0035] Take 1L of alkaline zinc-nickel alloy wastewater produced by an electroplating workshop with pH=12, and its COD was measured Cr The concentration is 9670mg / L, the nickel content is 49mg / L, the waste water is put into the reactor, and nitric acid is added to adjust the pH value of the waste water to pH=8.0, according to the molar ratio K 2 FeO 4 :COD cr = Add potassium ferrate in the amount of 1:1 to carry out complex-breaking reaction, and the reaction time is 1h. The solid insoluble matter is generated through the complexation reaction, and the solid-liquid separation is carried out to obtain the solid insoluble matter and the filtrate. Add nitric acid to the filtrate to adjust the pH value of the wastewater to pH=3.0, add manganese nitrate and ferrous sulfate, and the molar ratio of the two is Mn 2+ :Fe 2+ =1:4, according to molar ratio H 2 o 2 :COD crThe amount of =0.5:1 added concentration is 30% hydrogen peroxide, wherein the total substance concentration of ...

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Abstract

The invention discloses an alkaline zinc-nickel alloy wastewater treatment method. The method comprises the following steps: 1, pretreating: adding an acid to adjust the pH value of alkaline zinc-nickel alloy wastewater to 8-9.5; 2, performing complex breaking treatment on the treated alkaline zinc-nickel alloy wastewater to decompose and destroy most of organic complexing agents and other additives in the wastewater, and allowing nickel in the wastewater to be combined with substances produced during decomposing and destroying to form a solid insoluble matter; 3, performing solid-liquid separation to obtain the solid insoluble matter and a filtrate; 4, adding the acid to the filtrate to adjust the pH value of the filtrate to 2.5-4; 5, sequentially adding a metal salt and an oxidant to thefiltrate, and performing an oxidation reaction; and 5, adding an alkali to the oxidized wastewater to adjust the pH value of the wastewater to 10-11 and precipitate the solid insoluble matter, and performing solid-liquid separation. The method can be used to specifically treat stably-complexed heavy metal nickel in the alkaline zinc-nickel alloy wastewater, effectively reduces the CODCr value andthe heavy metal nickel content of the wastewater, and allows the highest treatment concentration of the heavy metal nickel to reach 60 mg / L.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment and recovery, and relates to a treatment method for alkaline zinc-nickel alloy wastewater, in particular to a treatment for degrading a large amount of organic complexes in high-concentration alkaline zinc-nickel alloy wastewater and simultaneously removing nickel ions method. Background technique [0002] Alkaline zinc-nickel alloy is a green and environmentally friendly alternative cadmium electroplating process that has emerged in recent years. Its coating has excellent corrosion resistance. It is currently recognized as the cheapest and best performing cadmium coating. [0003] The main components of alkaline zinc-nickel alloy plating solution include: zinc salt, alkali, nickel salt, organic complexing agent, various organic additives, etc. In order to maintain the long-term stability of the strong alkaline plating solution, a large amount of organic complexing agents and addit...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/08C02F101/20
CPCC02F1/32C02F1/66C02F1/72C02F1/725C02F1/78C02F9/00C02F2101/20
Inventor 蔡大牛刘航骆劲松谢彬彬叶圣武
Owner NANJING YUANQUAN TECH CO LTD
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