Techhnique for reclaiming metal concentrate in obsolete PCB physically

A technology for waste circuit boards and metals, which is applied in the field of physical recovery process of metal-rich groups in waste circuit boards, can solve the problems of low sorting efficiency, many classifications, and inaccuracy, and achieves avoiding secondary pollution and sorting level. The effect of wide, broad utility

Inactive Publication Date: 2005-01-12
CHINA UNIV OF MINING & TECH
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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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  • Techhnique for reclaiming metal concentrate in obsolete PCB physically

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Embodiment Construction

[0015] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0016] The dry physical recycling process of the valuable components on the electronic waste boards of the present invention, the pretreated waste printed circuit board 1, through the special double-toothed roller shearing machine 2, cuts the entire circuit board into a size of 30 Small pieces 21 of × 30mm; then sent to the high-efficiency impact crusher 3 for further crushing to obtain fine-grained materials 31; through the magnetic separator 4, ferromagnetic substances 42 and non-ferromagnetic substances 41 are recovered by the magnetic field, and the non-ferrous The magnetic material 41 is sent to the multi-layer sieve 5 for classification. The multi-layer sieve 5 is composed of overlapping sieve plates of coarse-grained grade, slightly coarse-grained grade, fine-grained grade and fine-grained grade. The number of layers can be set from 2 to 5 layers, an...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B5/00C22B1/00C22B7/00
CPCY02P10/20
Inventor 赵跃民温雪峰何亚群曹亦俊
Owner CHINA UNIV OF MINING & TECH
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