Treatment method of copper-containing micro-etching waste liquid

A technology for micro-etching liquid and waste liquid, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. To achieve the effect of saving resources and energy, low operating costs and protecting the environment

Inactive Publication Date: 2014-05-21
WUHAN JIAHENG CHEM
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

Although, this method is simple and easy, but the catalyst NaNO 2 It is a carcinogen, and the dosage in the production process is large, and the nitrite ion in the product is easy to exceed the standard, which limits its application in drinking water treatment; the discharge of nitrogen oxides pollutes the environment, and the post-treatment process is complicated; the reaction speed Slow, to adapt to large-scale industrial production, need to adopt improvement measures

Method used

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Embodiment

[0026] The copper-containing micro-etch waste liquid comes from an electronic company's micro-etch liquid. The annual waste liquid is 20,000 tons. Copper ions in the form of hydrated ions [Cu(H 2 O) 4 ] 2+ exist.

[0027] The processing method of micro-etching waste liquid containing copper comprises the following steps:

[0028] 1) Reduction: Add 232.4 tons of reduced iron powder with a purity of 99% to 20,000 tons of copper-containing micro-etching waste liquid. After full reaction, use a plate and frame filter press to separate solid and liquid, collect 196 tons of sponge copper, and filtrate Carry out the next step;

[0029] 2) Complexation: Add 0.8 tons of Cu heavy metal ion trapping agent to the filtrate obtained in step 1) for complexation and precipitation. The active group of the Cu heavy metal ion trapping agent is sodium dithiocarbamate. Solution is carried out solid-liquid separation again with plate and frame filter press, collects sponge copper 4 tons, and f...

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Abstract

The invention discloses a treatment method of copper-containing micro-etching waste liquid. The method comprises the following steps: (1) reducing: adding reducing iron powder into the copper-containing micro-etching waste liquid, fully reacting, performing solid-liquid separation, collecting a filter cake, and feeding filtrate into a next procedure; (2) complexing: adding a Cu heavy metal ion collecting agent into the filtrate obtained in the step (1), complexing, depositing, performing solid-liquid separation on a solution formed after complexing, collecting a filter cake, and feeding filtrate into a next procedure; (3) performing oxidative polymerization: oxidizing ferrous sulfate in the filtrate obtained in the step (2) to produce polymeric ferric sulfate, and removing CODcr in the waste water. The copper-containing micro-etching waste liquid produced during electronic manufacturing is treated and comprehensively utilized, so that the environment is protected, resource energy is saved, and heavy metal copper and polymeric ferric sulfate serving as a water purifying agent in sewage treatment plants are provided for the development of the national economy. The treatment method is low in cost, small in investment, low in running cost, and suitable for industrial production.

Description

technical field [0001] The invention relates to a treatment method for waste water, in particular to a treatment method for copper-containing micro-etch waste liquid. Background technique [0002] Copper-containing micro-etching waste liquid is widely sourced from electronics, electroplating, smelting, chemical and other industries. With the development of domestic research and development technology and the continuous input of foreign electronic products, the amount of electronic copper-containing micro-etch waste liquid to be treated is increasing year by year. Moreover, people have fully realized the harm caused by various waste discharges to the environment, and all kinds of copper-containing micro-etching waste liquids must be strictly treated and discharged to meet the standards. [0003] A large amount of scientific research work has been carried out at home and abroad on the treatment of copper-containing micro-etching waste liquid. In summary, there are mainly the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C22B7/00C22B15/00C01G49/14
Inventor 龚凌坤
Owner WUHAN JIAHENG CHEM
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