Patent ID: 6431253
Filing Date: 2002-08-13
Classification: B22C,C10G

Abstract:
A method of recovering filler from a lost wax composition, comprising:separating crude reclaimed filler, in which at least one of a) a waste wax composition containing a filler, and b) a residue formed by separating or extracting a wax component from the waste wax composition, is dissolved and dispersed in an organic solvent, wherein a resulting dispersion is then separated into a dissolved wax phase and a solids/wax-containing fraction, and wherein a wax component and the organic solvent are recovered from the solids/wax-containing fraction; dispersing the crude reclaimed filler in an aqueous alkaline solution including a surface active agent, thereby to dissolve and thus remove alkali-soluble impurities; and recovering further purified filler from said alkaline solution and washing said further purified filler with water.