Electroplating wastewater treatment equipment Electroplating wastewater

Electroplating wastewater treatment is a kind of complex mixed heavy metal wastewater treatment which is difficult to be thoroughly treated. The treatment of electroplating wastewater must be carried out according to such factors as the quality, quantity, process conditions, production load, operation management and water use method of electroplating wastewater. The water quality of electroplating heavy metal wastewater treatment is complex, and the composition is difficult to control. It contains cyanide, acid, alkali, hexavalent chromium, copper, zinc, cadmium, nickel, gold, silver and other heavy metal pollutants, which are highly toxic. Some of them are carcinogenic, teratogenic, and mutagenic, and are extremely harmful to human beings.

There are three types of electroplating wastewater:

1. When the rinsing water plated parts are taken out of the plating bath, there is a small amount of plating solution on the parts. In order not to affect the next process, flush or rinse with water to reduce the concentration of residual plating solution on the workpiece. This part of water is the main part of electroplating wastewater, accounting for about 90% of the total amount, and the residual amount of heavy metals is generally about 500-2000mg/L;

2. The content of metal ions in the waste liquid is about 30000 mg/L, which is generally not discharged, but the conversion products, plating solution or chemical plating solution need to be discharged. The concentration of this part of waste liquid is very high and difficult;

3. Acid alkali wastewater accounts for 5-10% of the total amount, and the discharge time is 7-100 days.

Electroplating enables products to obtain some special functions by coating a thin functional coating on the part substrate, commonly known as functional electroplating. Functional electroplating is also a widely used process in electroplating process, which plays an important role in industrial development, and plays an important role in the development of electronics, materials, machinery, aerospace and other industries, becoming an important supporting force for modern industrial development. Electroplating processes include gold plating, silver plating, tin plating, plastic plating, chemical plating, etc. The application includes the following aspects:

1) Electroplating improves the conductivity of products: the metal resources used can achieve a large functional effect, so as to achieve industrial popularization of products: a layer of gold and silver is plated on the copper or zinc alloy substrate, so that the products have good conductivity and low resistance, and achieve industrial applications that can not be achieved by a single precious metal product. This process is widely used in the electronic industry, representing electroplating processes such as gold, silver, nickel and multi alloy;

2) Electroplating improves the solderability of the product: by electroplating a layer of tin lead alloy, the solderability of the product is improved without affecting the conductive, mechanical and other functions; Especially in the electronic industry, mechanical assembly is a very important surface treatment technology.

3) Plating makes non-metallic materials metalized: plastic electroplating is the representative of this process. With the development and maturity of plastic electroplating technology, new material industries such as plastics have developed rapidly, and integrated circuits in the electronic industry have become possible, which has promoted the development of the entire electronic industry. The representative is PCB plastic circuit board electroplating process.