Concentration method of copper-containing wastewater from production process of printed circuit boards

Abstract

The invention relates to a concentration method of copper-containing wastewater from the production process of printed circuit boards, comprising the following steps: copper-containing wastewater fromthe production process of printed circuit boards is introduced into a raw water tank of separation equipment, and undergoes concentration treatment through a first-stage separation membrane so as toobtain a first concentrate and a first dialysate; then, the first concentrate is introduced into the raw water tank to be recycled, and the first dialysate is introduced into a collecting box; the first dialysate undergoes concentration treatment through a second-stage separation membrane so as to obtain a second concentrate and a second dialysate; and finally, the second concentrate is introducedinto the raw water tank to be recycled, and the second dialysate is discharged. By the concentration method of copper-containing wastewater from the production process of printed circuit boards, useof extractants, etc. is reduced, discharge of pollutants is decreased, copper recovery rate is high, and recycled acid can be repeatedly used or emission-free. The method of the invention is energy-saving, low-consuming and cost-saving.

Description

technical field [0001] The invention relates to a method for concentrating copper-containing wastewater in the production process of printed circuit boards. Background technique [0002] With the rapid development of the electronics industry, the current printed circuit board (PCB) market has greatly increased, and the production of printed circuit boards has become an important basic industry in the electronics industry. However, a large amount of copper-containing wastewater will be produced in the PCB production process, and the water quality is complex. The main pollutants in the wastewater include: acid and alkali, suspended solids, copper, nickel, ammonia nitrogen, and comprehensive agent NH 4 OH, EDTA and other organic substances are harmful to the environment; and PCB copper-containing wastewater has a large amount of water, which leads to difficult and high processing costs in actual engineering, thus limiting the development of components in the electronic industry...

AI Technical Summary

Problems solved by technology

However, a large amount of copper-containing wastewater will be produced in the PCB production process, and the water quality is complex. The main pollutants in the wastewater include: acid and alkali, suspended solids, copper, nickel, ammonia nitrogen, and comprehensive agent NH 4 OH, EDTA and other organic substances are harmful to the environment; and PCB copper-containing wastewater has a large amount of water, which leads to problems in actual engineering that are difficult to deal with and high in treatment costs, thus limiting the development of components in the electronic industry

Using traditional chemical precipitation method, ion exchange method, chemical oxidation method, activated carbon adsorption and other methods to treat PCB copper-containing wastewater, it is difficult to meet the total copper discharge standard of effluent, and the treatment cost is high, and secondary pollution is easy to occur.