Techhnique for reclaiming metal concentrate in obsolete PCB physically

Abstract

A physical recovery technology of metal enriched materials from waste CB applies a mechnanical and physical sorting method to cut, crush, screen, sort and separate the waste CB by a double tooth roll shearer, a punch crusher, a magnetic separator, a separating screen, a rotary static separator, high efficient centrifugal separator to get a multicomponent of metal rich collection and a nonmetal enriched material to recover all valuable components from waste CB.

Description

technical field [0001] The invention relates to a recycling method of electronic waste, in particular to a physical recycling process of metal-enriched bodies in discarded circuit boards. Background technique [0002] In recent years, with the rapid development of electronic technology, a large amount of electronic waste has been generated. Due to the complex composition of electronic waste, it causes serious pollution to the surrounding environment and puts great pressure on environmental protection. At present, there are mainly hydrometallurgy, pyrometallurgy, mechanical treatment or a combination of several treatment technologies for the recycling of electronic waste boards and cards at home and abroad. This method is favored because no toxic products are produced by mechanical treatment. Patent No. "98105592" discloses "a method for recovering valuable substances from printed circuit boards". Machine and water tank, and in turn cut, smash, po...

AI Technical Summary

Problems solved by technology

It is aimed at discarded printed circuit boards without components instead of real printed circuit boards (it is not accurate to call printed circuit boards), and its disadvantage is that there are too many classifications, and the separation efficiency of ordinary airflow separator Low, greatly affected by the shape of the material; for fine-grained (-0.074mm) materials, effective separation cannot be achieved

According to foreign literature, most of the circuit boards are crushed by liquid nitrogen freezing method, and then classified by electric separation, eddy current separation, magnetic separation and other methods. The disadvantage is that the crushed materials are too finely classified. Airflow sorting, the efficiency is low, and the fine-grained (-0.074mm) materials are not treated. If it is industrialized, there are disadvantages such as cumbersome process and low sorting effect.

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