PCB waste liquid production huge resource rich disposal mode urgently needs to be upgraded
Traditional PCB enterprises have complex production processes, long process flow, large resource consumption, wide range of chemicals used and large amount, which is one of the typical heavy pollution industries.In general, complex and high-risk waste pollutants will be generated, including waste acid, alkali etching waste liquid, low-copper waste liquid, COD ammonia nitrogen waste liquid, and various electroplating waste liquid, fluoride, cyanide and other secondary pollutants containing copper, nickel, tin and other metals.According to the statistical yearbook of China's electronic information industry, the average water consumption to produce 1 m2 circuit board is over 3.4 tons, and the waste water generated by the PCB industry is 680 million m3 annually.
From the perspective of resource consumption, China consumes about 6.2 million m3 etching solution, 4.6 million m3 microetching solution, and 150,000 m3 tin discharging water every year. The etching solution, microetching solution and tin discharging water used are all disposable.The waste liquid produced by the above consumed solution contains 1 million tons of copper, 15 thousand tons of tin, 75 million tons of ammonium chloride, 1.5 million tons of ammonia, 650 thousand tons of hydrochloric acid, 230 thousand tons of sulfate, 70 thousand tons of nitric acid, and 22 thousand tons of ferric nitrate.
These pollution index is high, resource consumption is fast pollution source, but also valuable potential composite resources.PCB general outsourced transport to units with hazardous waste disposal qualification for processing.The treatment generally adopts the chemical technology method of neutralization precipitation, only extracts some copper ions and heavy metals in the waste liquid. The potential resources contained in the waste liquid, such as ammonia nitrogen, hydrochloric acid, sulfuric acid, chloride, fluoride, thiourea, etc. are also chemically neutralized and directly discharged together with the waste water.
This method, on the one hand, wastes chemical resources, and on the other hand, causes different degrees of secondary pollution.Moreover, this treatment mode is only a reduction treatment of the pollution source, which cannot eliminate the production of waste liquid at the source, and there is a risk of leakage during the pollution source transfer and transportation.
PCB waste liquid recycling online quietly rise, the Oriental garden clean and chi model popular
What deserves industry attention is that a new PCB waste liquid recycling and processing mode is quietly emerging in the industry.Have handled this kind of new pattern to the current domestic enterprise mainly has three, respectively is shenzhen Oriental garden clean chi technology (belong to because of the agricultural bank stakes in high-profile waste new Oriental garden owned enterprise), guangdong jiangmen daying, guangdong chenhui, three have been installed in more than 80 PCB companies lines waste recycling equipment online.Among them, jic technology dominates, with more than 70 installation manufacturers, 7 in jiangmen and 4 in guangdong chenghui.
There are two specific methods of operation.The first is the direct sale of processing equipment to PCB enterprises operating by themselves, represented by jiangmen daying, guangdong chenghui.At present, jiangmen daying has stopped using or equipment removed from PCB enterprises;The main purpose of guangdong chenghui is to extract copper. The waste liquid from its equipment still needs to be transferred to the hazardous waste center for disposal.
The second is the BOO(build-own-management) and BOT(build-operate-transfer) model, represented by jie chi technology.According to li jianguang, general manager of technology in shenzhen Oriental garden jielchi, the business of Oriental garden jielchi can be divided into two categories, with PCB equipment as the auxiliary, and etching waste liquid recycling regeneration system as the main part.
The model has four advantages: the first is the BOO and BOT model, which basically enables PCB enterprises to operate with zero input.The second is to reduce the emission of most hazardous waste by recycling technology.The third is to extract valuable products without destroying their components, and the waste liquid can be recycled to achieve recycling.The fourth is that the entire treatment process is closed circuit circulation, which can eliminate waste liquid pollution in the production process without secondary pollution, and the end product can be recycled, realizing harmless.
Therefore, the Oriental garden jielchi model of PCB waste liquid disposal has been widely recognized in the market.Many PCB giants, such as foxconn, huizhou huatong, kunshan zhongzhe electronics, and Formosa plastics South Asia electronics, have installed jic equipment.