Recycling method of electroplating wastewater containing copper nitrate

A technology for electroplating wastewater and resource recovery, applied in copper nitrate, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve problems such as deteriorating operating conditions, reverse dissolution of cathode copper, and difficult process, and achieve short process flow and efficient wastewater treatment The effect of simplicity and simple process equipment

Active Publication Date: 2013-11-27
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method also has the following problems: one: copper nitrate in the process of electrowinning, nitrate radicals will react at the anode to produce nitrogen oxides, which will deteriorate operating conditions and pollute the environment; second: co

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  • Recycling method of electroplating wastewater containing copper nitrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The reaction steps are as follows: use 1000 mesh industrial grade calcium carbonate to prepare a suspension with a mass fraction of 60% in terms of calcium oxide, and use this suspension to pre-mix copper nitrate-containing electroplating wastewater (copper containing about 50g / L, pH=0.3 ) to 1.5, remove insoluble matter, and obtain a clear liquid; then add a small amount of distilled water to the reaction kettle, and turn on the stirring device, while raising the temperature to 35°C, and then mix the pH-adjusted clear liquid with carbonic acid Calcium suspension (sufficient amount) is added to the reaction kettle at the same time, and the pH value is controlled at 6.0. After the addition is completed, the pH is maintained and the stirring is continued for 20 minutes. Finished product; the filtered filtrate of the product is concentrated, evaporated and crystallized to obtain calcium nitrate product.

[0029] Detect the crystal composition and the structure of finished...

Embodiment 2

[0031] The reaction steps are as follows: use 700 mesh industrial grade calcium carbonate to prepare a suspension with a mass fraction of 20% in terms of calcium oxide, and use this suspension to pre-mix copper nitrate-containing electroplating wastewater (copper containing about 80g / L, pH=0.3 ) to 1.0, remove the insoluble matter, and obtain the clear liquid; then add a small amount of distilled water to the reaction kettle, and turn on the stirring device, while raising the temperature to 50°C, and then add the adjusted pH clear liquid (400ml ) and calcium carbonate suspension (sufficient amount) were added to the reaction kettle at the same time, and the pH was controlled at 4.5. After the addition was completed, the pH was maintained and continued to stir for 40 minutes. The product was filtered, washed, dried at 105°C, and crushed through a 60-mesh sieve. Finally, the finished product is obtained; the filtered filtrate of the product is concentrated, evaporated and crysta...

Embodiment 3

[0034] The reaction steps are as follows: use reagent-grade quicklime to prepare a suspension with a mass fraction of 40% in terms of calcium oxide, and adjust the pH value of copper nitrate-containing electroplating wastewater (copper content is about 130g / L, pH=0.3) to 2.0 in advance , remove the insoluble matter, and obtain the clear liquid; then add a small amount of distilled water to the reaction kettle, turn on the stirring device, and raise the temperature to 70°C at the same time, then mix the clear liquid and calcium hydroxide suspension (enough At the same time, add it to the reaction kettle, control the pH at 4.0, keep the pH and continue stirring for 30 minutes after the feeding is completed, filter, wash, and dry the product at 70°C, crush it through a 60-mesh sieve, and finally get the finished product; the filtrate after the product is filtered Calcium nitrate products are obtained after concentration, evaporation and crystallization.

[0035] Detect the cryst...

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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...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01G3/08C01F11/36C02F103/16C02F101/20
Inventor 毛谙章周兆安李钧易海洋郑晓凤廖春华刘小文张银亮
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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