Today, the non ferrous metals such as copper, brass, lead and zinc in car scrap are not systematically recovered, although the iron and the aluminum contained in car scrap are recovered. Therefore, for the recycling of resources and the preservation of natural environment, we started to make a study of recovery system of the non ferrous metals from the car scrap. In this paper, we conducted the separation experiments by using the ECHO Metal Jig (Type-SP) with jig box having the dimension of 250mm in width, 250mm in length and 300 mm in height, which is particularly made for an experimental purpose. And -10mm shredder dust abandoned in the scrap factory is treated with this jig and separated into three products (non metal dust, middling and non ferrous metal concentrate). The effect of gate height, feed speed and pulsation time for middling separation has been investigated.The results obtained through the experiments are summarized as follows;(1) The gate height at middling separation; Most effective factor is the gate height at middling separation.When the gate height is higher, the weight and the recovery of concentrate increase and the grade of that decreases, and vice versa.(2) The feed speed; Throughout this test, 0.54kg/s of feed speed gives maximum concentrate recovery and the best separation performance.(3) The Pulsation time for middling separation; The pulsation time for middling separation has no effect on the grade, recovery of the concentrate and the separation performance.(4) The best operating condition of this jig is as follows; 200mm of gate height at middling separation, 20s of pulsation time for middling separation and 0.54kg/s of feed speed.(5) This jig is very effective for -10mm shredder dust, since over 90% of valuable metals having over 7.0 of specific gravity is recoverable with this jig separator.
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