PURPOSE: To highly efficiently treat a metal-contg. waste at a low cost by crushing waste appliances, etc., heating the separated metal-contg. grain in stages in a vacuum heating furnace and recovering the vapor of the metal and nonmetal and molten material generated in each stage.
CONSTITUTION: When waste is treated, the waste is crushed to 1-50 mesh, and the metal-contg. grain is recovered and separated. The granular waste 1 is then placed in a jig, introduced into a vacuum heat-treating device, passed successively through vacuum heating and vaporizing chambers 3 to 5 from a preheating chamber 2 and discharged through a cooling chamber 6. The waste 1 is preheated to 50-100°C, for example, to remove water, oil, etc., heated to 250°C in the chamber 3, heated to 660-750°C in the chamber 4 and further heated to 750°C to the temp. higher than the b.p. of the materials other than the iron to be recovered in the final chamber at 5×10-2 to 1×10-3Torr. The separated vapor and gas are sucked into condensers 10 to 12 and gas adsorbers 17 to 19 and recovered.
OGIWARA TERUHISA
YOKOYAMA YOSHIAKI
NISSEI IND
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