Waste circuit board recovery processing method

Abstract

The invention discloses a waste circuit board recovery processing method. The waste circuit board recovery processing method comprises the steps that 1, the plastic, the battery and the electric wire on a waste circuit board are removed; 2, a soldering side of the waste circuit board is immersed into the molten salt liquid downward until the tin is molten; 3, component on a base board of the waste circuit board is removed, and the base board and the component are cleaned with water; 4, the molten tin is recycled from the molten salt, and the molten tin is cooled until being solidified. The waste circuit board recovery processing method has the advantages that the molten salt is used for melting the soldering tin on the waste circuit board, the molten tin is cooled and solidified, and the soldering tin ingot is recycled; both the base board and the component are washed with water, the environmentally-friendly and efficient detinning process is achieved, and secondary pollution additive is not introduced into the detinning process; the tin oxidation degree and the loss are low, and the recovery and purity of the tin are high.

Description

technical field [0001] The invention relates to the field of waste recycling, in particular to a method for recycling waste circuit boards. Background technique [0002] The printed circuit board (PCB) industry is the foundation of the electronic and electrical industry, and its output and consumption are huge. In 2012, the global printed circuit board output value reached 54.31 billion US dollars (National Statistical Yearbook 2013). my country is the world's largest producer and consumer of printed circuit boards, accounting for about 40% of the world (2013 annual report of the global electronic circuit industry), and more than 500,000 tons of waste printed circuit boards (WPCB) are discarded in my country every year (China Plastics Industry 2013 Statistical Report). The incineration of a large number of waste circuit boards will produce toxic gases. The discarded circuit boards and simple landfills will also pollute the surrounding land and water resources with heavy meta...

AI Technical Summary

Problems solved by technology

Taking metal tin on waste circuit boards as an example, at present, in the process of removing tin and removing components, there are mainly two types: physical heating and melting detin and chemical solvent dissolution detin: using chemical solvent to remove tin must use corrosion This method has high requirements on equipment and is easy to cause secondary pollution to the environment; physical heating method is the most common method of tin removal, which can be divided into infrared heating and thermal heating according to different heating methods. Air heating, metal conduction heating and high-frequency induction heating, these methods of direct heating detinning often produce smoke and gas during the tin melting process, and at the same time, the oxidation and loss of solder are relatively serious, resulting in poor recovery and purity of tin. high