Method for recycling neutral salt wastewater produced by metal pickling

A technology of wastewater recovery and neutral salt, which is applied in metallurgical wastewater treatment, chemical instruments and methods, neutralization water/sewage treatment, etc., can solve the problems of low content of valuable metal salts, waste of metal resources, non-renewable utilization, etc. Achieve the effect of increasing the content of metal ions, meeting the grade requirements, and saving the cost of chemicals
CN108178366AInactive Publication Date: 2018-06-19YIXING XINDE ENVIRONMENTAL PROTECTION TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
YIXING XINDE ENVIRONMENTAL PROTECTION TECH
Publication Date
2018-06-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for recycling metal hydroxide sludge resources generated from neutral salt wastewater produced by pickling in iron and steel industry after neutralization with liquidalkali. The method comprises the following steps: firstly, the neutral salt wastewater is reduced, and liquid alkali is added; metal hydroxide sludge (with solid content being 50%) is obtained after concentration with an ultra-micro separator and filter pressing with a filter press and stirred and blended with raw materials for smelting stainless steel, a product is fed into a blast furnace (or anelectric furnace) for direct smelting of stainless steel after meeting the furnace feeding requirement, valuable metal ions in the neutral salt wastewater can be recovered, harmful and hazardous solid waste is not produced, waste is changed into wealth, economic benefits of sewage treatment are increased, and treatment cost is reduced.
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Description

technical field

[0001] The invention belongs to the field of disposal of hazardous sludge produced after environmental protection wastewater treatment, in particular to a method for recycling and utilizing metal hydroxide sludge resources generated after neutralization of neutral salt wastewater produced by pickling in the iron and steel industry with liquid caustic soda. Background technique

[0002] With the rapid development of my country's technological economy, it has led to the rapid development of the steel industry. The original steel parts must be pickled before cold rolling, electroplating, and spraying to remove oxides on the surface and produce pickling wastewater. The main components of pickling wastewater are for SO 4 2- 、H + , Fe 2+ 、Na + 、Cr 6+ , F - 、Me n+ 、Ni 2+ etc. Pickling wastewater can generally be divided into neutral salt wastewater and mixed acid wastewater, and the main pollutants in mixed acid wastewater are: Fe 2+ , F - 、Me n+ 、Ni 2+ W...

Claims

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