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The Grinding Characteristics of the Metal Components in Printed Circuit Boards(PCBs) Scrap by the Swing-Hammer Type Impact Mill  

이재천 (한국지질자원연구원, 자원활용연구부)
길대섭 (한국지질자원연구원, 자원활용연구부)
남철우 (한국지질자원연구원, 자원활용연구부)
최철준 ((주)한국컴퓨터리사이클링, 기술연구소)
Publication Information
Resources Recycling / v.11, no.2, 2002 , pp. 28-35 More about this Journal
Abstract
A study on the grinding characteristics of metal components in printed circuit boards (PCBs) scrap by a swing-hammer typeimpact mill was conducted. The PCBs scrap crushed to sizes less than 3 mm were pulverized to liberate metal components by the impact mill. The effect of rotation speed of hammer on the grinding characteristics was investigated. The particle size distribution and degree of liberation of metals such as copper and solder were measured. The effect of rotation speed and particle size on the shape sorting of metal Particles from milled PCBs was investigated using an inclined vibrating Plate. At the hammer speed of 61.3 m/s about 80% of the copper particles became larger than 297 $\mu$m while 90% of solder particles was smaller than 297 $\mu$m. In the shape sorting method, the recovery location becomes shorter as the rotation speed of hammer increases. The recovery location for particles larger than 297$\mu$m was shorter than for particles sized between 149$\mu$m and 297$\mu$m. As the recovery location becomes shorter, KI value increases towards unity while $\phi_{c}$ value decreases towards unity indicating the more roundness of metal particles.
Keywords
printed circuit boards(PCBs); metal; liberation. shape sorting; inclined vibrating plate;
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