Method and equipment for preparing electroplating-grade nickel sulfate from nickel-containing wastewater produced in surface treatment process

A technology of surface treatment and nickel sulfate, applied in nickel sulfate, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of high safety treatment cost, complicated process, environmental hazards, etc., save manpower and material resources, improve Economic benefits, the effect of eliminating potential harm
CN104229906AActive Publication Date: 2014-12-24MEIZHOU ENVIRONMENTAL EQUIP
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
MEIZHOU ENVIRONMENTAL EQUIP
Publication Date
2014-12-24

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Abstract

The invention discloses a method and equipment for preparing electroplating-grade nickel sulfate from nickel-containing wastewater produced in a surface treatment process, and belongs to the technical field of nickel-containing wastewater treatment process. The method is characterized by comprising the following steps: (1) collecting nickel-containing wastewater; (2) performing sedimentation and press filtration on nickel in the nickel-containing wastewater, and smashing nickel mud to obtain nickel slurry; (3) dissolving the nickel slurry into acid; (4) filtering a nickel sulfate solution; (5) removing impurities from the nickel sulfate solution for purification, and performing secondary filtration; (6) performing vacuum evaporative concentration, crystallization, filtration and centrifugal drying on the nickel sulfate solution to obtain nickel sulfate crystals. The invention aims to provide the method and the equipment which can reduce the waste of nickel resources, reduce potential hazard of nickel to the natural environment and realize recycling of the nickel resources and are used for preparing the electroplating-grade nickel sulfate from the nickel-containing wastewater produced in the surface treatment process. The method and the equipment are used for treating the nickel-containing wastewater.
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Description

technical field

[0001] The invention relates to a method for preparing electroplating nickel sulfate, and more specifically, relates to a method for preparing electroplating-grade nickel sulfate by utilizing nickel-containing waste water produced in a surface treatment process. The present invention also relates to a special device applied to the above method. Background technique

[0002] In the surface treatment process, electroplating nickel and electroless nickel are two surface treatment processes that are often used. Electroplating nickel mainly includes electroforming nickel, sub-nickel, semi-bright nickel, bright nickel, and pearl nickel. The nickel in these electroplating forms is mainly nickel sulfate and a certain amount of nickel chloride. There are two main types of chemical nickel: alkaline chemical nickel and acidic chemical nickel. The main components are nickel sulfate, reducing agent, complexing agent, stabilizer and so on. The nickel content in electropl...

Claims

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