Recycling processing technology for waste circuit board

Abstract

The invention discloses a recycling processing technology for a waste circuit board and relates to the recycling processing technology for waste resources. The recycling processing technology comprises the following steps of: cutting wastes; manually separating; removing gold; removing tin; primarily crushing; magnetically separating; secondarily crushing; separating by vibrating; separating through airflow; crushing pellets; separating according to specific gravity; compounding plastic and wood; and lastly, respectively recycling the matters, such as gold, silver, aluminum, iron, tin, copper, lead, plastic and resins, thereby reusing the matters. The recycling processing technology has the advantages that: (1) the flow line production operation is realized, the degree of automation is high and the yield is high; (2) compared with the traditional processing method, the recycling processing technology effectively reduces the emission of toxic gas and water and improves the environmental protection index; and (3) various matters in the waste circuit board are more effectively separated, the noble metal is recycled, the recycling of resources is realized, the mineral resource exploitation and wood felling are indirectly reduced, and the energy consumption and pollution during the processes of mineral resource exploitation and metallurgy processing are reduced.

Description

technical field [0001] The invention relates to a process for processing, recycling and reusing waste resources, in particular to a process for processing and recycling waste circuit boards. Background technique [0002] At present, the replacement cycle of electronic products is continuously shortened. A large number of electronic products are scrapped after reaching the end of their service life and become electronic waste. Among them, circuit boards are the most difficult parts to handle. Pollution. The composition of circuit boards usually contains a large amount of renewable metals, such as copper, iron, lead, tin, nickel, etc., as well as precious and rare metals such as gold, silver, platinum, palladium, non-metallic plastics, rings, etc. Oxygen resin, phenolic resin, glass fiber, etc. At present, there are two main methods for processing circuit boards. One is chemical method, which is to remove plastic components and other organic substances in waste circuit board...

AI Technical Summary

Problems solved by technology

At present, there are two main methods for processing circuit boards. One is chemical method, which is to remove plastic components and other organic substances in waste circuit boards through combustion, roasting, sintering, melting, thermal analysis and reaction in high temperature gas phase. common method for extracting precious metals and base metals, but the organic components in this chemical method are lost due to volatilization and slagging, while the recovery of metals such as tin, platinum, aluminum and zinc is very low or almost impossible Recycle

In addition, this chemical treatment method has a low degree of automation, and the high-temperature metallurgical process involved will generate a large amount of waste gas, waste residue and waste water, which also seriously threatens environmental safety; the other is a biological method, such as the use of biological filtration in foreign countries. The gold in the gold-plated circuit board waste is treated with the filtrate containing ferric ions and bacterial culture, pH<2.5, and the temperature is 20~35°C. After about 50 hours, 97% of the gold is recovered in the form of flakes and deplated Metals mostly remain undisturbed and are easily further separated, while the filtrate can be reused after bacterial reduction

The main advantages of this biotechnology are simple, cheap and easy to operate, but its main disadvantages are long leaching time, difficult recovery and use of filtrate, difficult to promote and use, and low yield

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