A method for treating waste water containing Cr6+

A waste water and blast furnace slag technology, applied in chemical instruments and methods, adsorption water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of large chemical consumption, high treatment cost, secondary pollution, etc., and achieve good results Social benefit, easy operation and low cost

Inactive Publication Date: 2011-12-28
XINXING DUCTILE IRON PIPES CO LTD
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Problems solved by technology

[0003] There are many kinds of treatment technologies for chromium-containing wastewater, each with advantages and disadvantages. At present, the treatment methods for Cr6+-containing wastewater mainly include chemical reduction, ion exchange, chemical precipitation, extraction and adsorption, and more than 90% of chromium-containing wastewater in China use Chemical reduction method, but this method needs to consume a large amount of chemicals, not only the treatment cost is high, but also easy to cause secondary pollution; the ion exchange method requires frequent regeneration of the ion exchanger, the operation is complicated and the treatment cost is high

Method used

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Embodiment Construction

[0008] The invention comprises the following steps: 1) mixing 90% blast furnace slag and 10% coke slag by weight, putting them into a pulverizer for crushing to obtain a mixture of blast furnace slag and coke slag with a particle size of 0.5 mm; 2) 1. Put 10m3 of Cr6+-containing wastewater into a centrifugal device with a constant temperature oscillator, add 2000kg of the mixture of blast furnace slag and coke slag, start the constant temperature oscillator, vibrate for 150min, and centrifuge. The supernatant liquid is qualified water, which is discharged for reuse. The precipitate is a mixture of blast furnace slag and coke slag and the chromium hydroxide produced by the reaction, which is used as raw material for the production of slag cement.

[0009] Blast furnace slag contains Fe2+, which will dissolve when it comes into contact with acidic industrial chromium (Cr6+) wastewater with a low pH value, and reduce the more toxic Cr6+ to less toxic Cr3+. Adsorption also plays ...

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Abstract

The invention relates to a method for treating Cr6+-containing wastewater, which is applicable to all fields of Cr6+-containing wastewater treatment, and is particularly suitable for treating Cr6+-containing industrial wastewater. The method comprises the following steps: 1), mixing blast furnace slag and coke slag, putting them into a pulverizer to pulverize them to obtain a mixture of blast furnace slag and coke slag; 2), putting waste water containing Cr6+ into a centrifugal device with a constant temperature oscillator, adding For the mixture of blast furnace slag and coke slag, start the constant temperature oscillator, oscillate, and centrifuge, the supernatant liquid is qualified water, discharge it for reuse, and the precipitate is the mixture of blast furnace slag and coke slag and the chromium hydroxide generated by the reaction, which is used as Raw material for the production of slag cement. Not only is it low in cost, the removal rate of Cr6+ is over 99%, but also it utilizes waste resources and is easy to operate.

Description

technical field [0001] The invention relates to a method for treating Cr6+-containing wastewater, which is applicable to all fields of Cr6+-containing wastewater treatment, and is particularly suitable for treating Cr6+-containing industrial wastewater. Background technique [0002] Chromium (Cr) and its compounds are widely used in industry. Some industries such as mining and smelting, chemical industry, electroplating, leather, printing and dyeing, pharmaceuticals, papermaking and other industries will produce a large amount of chromium-containing wastewater, especially Cr6+ is highly toxic, and its toxicity is higher than that of Cr3+ 100 times higher, Cr6+ is more likely to be absorbed by the human body and accumulate in the body. It is a carcinogen, and if it is directly discharged into the natural world without treatment, it will cause serious harm to the environment and human health. [0003] There are many kinds of treatment technologies for chromium-containing waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F1/66C02F1/28C01G37/00C02F101/22
Inventor 朱伟申勇
Owner XINXING DUCTILE IRON PIPES CO LTD
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