SELECTIVE SEPARATION OF FAT AND OIL FROM METALLIC WASTE MATERIAL

PURPOSE:To separate fats and oils by vaporizing them from a metallic waste material contg. fats and oils sticking to it with good heating efficiency and to obtain a steelmaking starting material. CONSTITUTION:In this separation, the metallic waste material M contg. fats and oils is charged into the heating furnace 10 and dielectrically heated to a temp. above the vaporization temp. of the fats and oils in a non oxidizing atmosphere. The vaporized fats and oils g1 are entrained in the carrier gas g2 and carried to the cooling chamber 20 and there liquefied or solidified by cooling them to recover them as the fats and oils f1. Optionally, the metallic waste material is blended with a solid material contg. carbon such as coke which is effective in improving the dielectric heating efficiency and acts as a reducing agent. At the time of keeping the heating furnace 10 under a reduced pressure or vacuum, the vaporization of the fats and oils is promoted. The metallic waste material M, from which the fats and oils are removed, is not oxidized or peroxidized and therefore can be utilized as a useful steelmaking starting material. The separated fats and oils f1, which are not burned and accordingly, of which properties and composition remain almost unchanged, can be used as a raw material of fuel, metallic soap, etc.