METHOD FOR SEPARATING PLASTIC COMPONENT FOR RECYCLING

摘要

PROBLEM TO BE SOLVED: To obtain an improved floatation separation process for separating certain formed thermoplastic components from other substances comprising other plastic components. SOLUTION: A separation process, wherein an alkali metal salt or alkaline earth metal salt of a phosphate, a pyrophosphate, a metaphosphate or a polyphosphate to provide a concn. greater than 1.0 g/cm<3> , generally about 1.05-1.6 g/cc, is dissolved. A particularly favorable salt is sodium dihydrogenphosphate. Preferably, the floatation separation process is employed to separate physical mixtures of plastic parts.