Recycling method of electroplating wastewater containing copper nitrate

Abstract

The invention provides a recycling method of electroplating wastewater containing copper nitrate and relates to the field of treatment methods of electroplating wastewater, aiming at providing a treatment method of electroplating wastewater containing copper nitrate, which is low in treatment cost, simple to operate, wide in application range, diversified in recycled products and relatively high in added value of products. The method mainly comprises the following steps: adding a small amount of distilled water into a reaction kettle to serve as base solution, starting a stirring device when the reaction temperature rises to 35-90 DEG C, adding the pre-treated electroplating wastewater containing copper nitrate and calcium oxide, calcium carbonate or calcium hydroxide slurry into the reaction kettle to react, filtering, washing, drying and sieving the reaction product to obtain an alkali type copper nitrate product, and carrying out concentration evaporating and crystallizing the filtrate to prepare a calcium nitrate product. The treatment method provided by the invention has the advantages that process flow is short, operation conditions are easily controlled, the method has safe and environment-friendly function, applicable treatment concentration range of electroplating wastewater containing copper nitrate is wide, and the method is particularly suitable for recycling copper in copper nitrate wastewater for small and medium enterprises.

Description

technical field

[0001] The invention relates to the field of treatment methods for electroplating wastewater, in particular to a resource recovery method for electroplating wastewater containing copper nitrate. Background technique

[0002] Electroplating is the process of plating a thin layer of other metals or alloys on the surface of certain metals using the principle of electrolysis. It is a process of using electrolysis to attach a layer of metal film to the surface of metal or other material parts to prevent Corrosion, improve wear resistance, electrical conductivity, reflective properties and improve appearance.

[0003] Copper nitrate wastewater widely exists in the field of electroplating, such as: in many processes that use copper as the substrate of the plating, nitric acid is usually used to remove the copper oxide on the surface of the copper before electroplating; when other metal objects are copper-plated, hangers A layer of copper will also be plated thereup...

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