| 摘要 |
The invention concerns a method for decontaminating waste lubricating oils which consists in: a) pouring the oils to be treated in a container, adding thereto 1-2 wt. % of glycol, heating at 60 DEG C, stirring and allowing to cool and decanting; b) drawing the aqueous phase, adding to the oily phase a chelating agent, in sodium solution with a pH < 7, preferably pH 6, bringing to 60-80 DEG C, stirring for at least one hour, then centrifuging; c) adding to the oily phase a coagulating agent; d) adding to the oily phase barium hydroxide in water to precipitate the sulphate and phosphate ions in the form of barium sulphate and phosphate which is separated; e) performing a fractionated distillation to recuperate the basic constituents of the oils, and optionally carrying out a discoloration of the resulting products. |
