应用高频气力分选机分选电子废料碎片的研究

进行了实验室高频气力分选机分选3～0.3 mm印刷电(线)路板模拟物料的研究.结果表明,在振频为1 621次/min,上升风量为120 m3/h,95 m3/h,60 m3/h,床面横向倾角6.64°,纵向倾角为1.07°时,金属回收率达93.95%;重产物金属品位为89.19%;轻产物中非金属的品位达99.33%.0.5～0.3 mm细粒物料的分选效果也是令人满意的.

A new way of splitting the electronic scraps by using high-frequency-vibration-air separator

The present paper aims to introduce the authors' newly developed method for splitting the Printed Circuit Boards (PCB) scraps in hoping to reduce the waste pollution caused by the electronics wastes. As is known, the wasted printed circuit board (PCB) scraps have become a kind of public harm with each passing day, which has made it an urgent task to find new ways to properly treat them by recycling their use not only in China but also in the world. Research has been done by using high-frequency-vibration-air separator in a laboratory scale to separate 3-0.3 mm man-made material. For the better simulation of PCB scraps, the man-made material made of copper, iron, aluminum as well as rubber is used. At the same time, their constituent ratio is also simulated to make them similar to the ratio of PCB scraps. The test equipment the author of this paper adopted is high-frequency-vibration-air separator, which are used to separate materials of high density. The main adjustment parameters are the frequency, the inclining angle and the flow of air. Our test results have shown that the grade and recovery of metal and nonmetal products are so high that the grade and recovery of metals and non-metals can reach 89.19%and 99.33% respectively while the recovery of metals can be as high as 93.95%. However, when copper and iron mix into heavy products and the quantity of aluminum content may only account for 0.67% in the light product, most of the aluminum would distribute in the heavy products, whose proportion of aluminum takes only 16% in the intermediary products. The size may seem to influence the separation effect. But when the size is reduced, it would be difficult to do more splitting. Nevertheless, for the size of 0.5-0.3 mm fine material, the grade and recovery of metals are 85.71% and 96.01% respectively, the separation result is satisfactory.