| 摘要 |
<p>The invention relates to a process for separating mixtures of solids of diff erent density, a separating liquid and a device for implementing the process. The process is especially suitable for the analysis and technical preparation of waste plastics, glass and electrical scrap. The features of the process of the invention are that the reduced mixture of solids with a particle size of 0.1 to 80 mm are brought successively into contact with sol utions of separating liquids of differing density in steps of 0.005 to 0.1 g/cm3 withi n a selected range from that between 0.8 and 2.9 g/cm3 and the floating or sinking solid compon ents are separated after each step. The separating liquid in the density range betwee n 1 and 2,9 is preferably an aqueous solution of an alkaline or alkaline earth salt of meta tungstate with a concentration in the range 1 to 80 mass % and an oxidant selected from the c hromate, dichromate, permanganate, nitrate, peracid and perester group with a concent ration of 0.05 to 0.5 mass %. Devices for implementing the process are described.</p> |
