Method for processing chrome wastewater from steel surface passivation process

A steel surface and treatment method technology, which is applied in the field of industrial wastewater treatment, can solve the problems of inconvenient operation management, secondary environmental pollution, and high operating costs, and achieve the effects of simple recycling process, low equipment investment, and cost reduction

Inactive Publication Date: 2009-07-15
WUHAN IRON & STEEL (GROUP) CORP +1
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Problems solved by technology

The above-mentioned methods have various problems such as complex process, inconvenient operation and management, la

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  • Method for processing chrome wastewater from steel surface passivation process

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Embodiment Construction

[0023] Take the chromium-containing waste water produced by the surface passivation of silicon steel of Wuhan Iron and Steel (Group) Company as an example below in conjunction with the accompanying drawings to further explain the present invention.

[0024] The specific method is:

[0025] (1) Pretreatment: Add sodium hydroxide to the pH adjustment tank to adjust the pH value of the chromium-containing wastewater to 6-8, and perform mechanical stirring at the same time to speed up the reaction speed and balance the water quality;

[0026] (2)O 3 Oxidation reaction: According to the measured concentration of trivalent chromium in the chromium-containing wastewater, a strong oxidant O is introduced into the pH-adjusted chromium-containing wastewater. 3 , O 3 The input amount is 20-100mg / L, the reaction time is 1-3 hours, and the trivalent chromium is oxidized to hexavalent chromium, and the reaction formula is 2Cr 3+ +O 3 +4H 2 O=Cr 2 o 7 2- +8H + ;

[0027] (3) Reagen...

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Abstract

The invention relates to a method for processing chrome-containing waste water generated in steel surface passivating work procedure of steel industry, which solves the problems of complex work procedures, inconvenient running and management, high technical invest, high running cost, unstable discharge, easy secondary environmental pollution and the like of the prior chrome-containing waste water processing. The technical scheme is as following: the chrome-containing waste water is preprocessed and oxidized by ozone to be mixed with medical agent to be compound passivation liquid, and the passivation liquid is sent back to the work procedure of chrome passivation to be used as passivation liquid. The invention has simple technology, low running cost, low technical investment, chrome recovery realization, zero waste water discharge and no environmental pollution.

Description

technical field [0001] The invention relates to a treatment method for industrial waste water, in particular to a treatment method for chromium-containing waste water produced in the steel surface passivation process in the iron and steel industry. Background technique [0002] Chromium exists in the forms of Cr(III) and Cr(VI) in water, among which Cr(VI) is the most toxic and one of the recognized environmental carcinogens. Chromium solution is often used in steel surface passivation treatment in the steel industry. For example, the silicon steel surface passivation of Wuhan Iron and Steel Group Corporation is carried out by spraying chromium solution. The process will produce a large amount of chromium-containing wastewater. [0003] The traditional process of treating electrochrome plating wastewater is to convert hexavalent chromium in wastewater into trivalent chromium and discharge it. The most commonly used methods are ferrite method, sulfite reduction method or ele...

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Application Information

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IPC IPC(8): C02F1/62C02F9/04C02F1/66C02F1/78C02F103/16
Inventor 吴高明杜建敏吴晓晖袁松虎舒纯王剑刘汉杰徐风贾永庆玉晖
Owner WUHAN IRON & STEEL (GROUP) CORP
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