Technology and device for treating mixed waste water produced by cold-rolling pickling of stainless steel and carbon steel

A technology of pickling wastewater and treatment process, which is applied in metallurgical wastewater treatment, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve problems such as difficult treatment, achieve convenient operation, reduce disposal costs, and reduce Effect of Environmental Burden
CN102730877AInactive Publication Date: 2012-10-17BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Publication Date
2012-10-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the field of treatment on metal ion-containing waste water and discloses a technology and a device for treating mixed waste water produced by cold-rolling pickling of stainless steel and carbon steel. The technology and the device are characterized in that according to effects of precipitation of different metal ions under different PH value conditions, a pH value and a precipitation process are adjusted sectionally so that separation of metal ions is realized. The technology and the device can effectively reduce use amounts of agents such as lime and the like, can reduce a production amount of sludge and is convenient for classified treatment on sludge.
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Description

technical field

[0001] The invention relates to the field of wastewater treatment containing metal ions, in particular to a stainless steel carbon steel cold rolling pickling mixed wastewater treatment process and device. Background technique

[0002] The mixed wastewater of stainless steel and carbon steel cold rolling and pickling concentrates on the diversity of metals and acids produced by stainless steel pickling and the large amount of wastewater produced by carbon steel pickling. In the process of cold rolling annealing, normalizing, quenching, welding and other processing, black oxide scales are often formed on the surface of stainless steel, and its main components are NiO, Cr 2 o 3 , Fe 3 o 4 , FeO Cr 2 o 3 , FeO Cr 2 o 3 · Fe 2 o 3 , the carbon steel surface is FeO, Fe 2 o 3 , Fe 3 o 4 and other dense oxides. This kind of scale needs to be removed by combined processes such as shot blasting, high-temperature alkali leaching, molten salt electrolysis,...

Claims

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