ULTRASONIC REMOVAL OF HEAVY-METALS FROM WASTE OILS

The elimination of lead from used motor oils is performed by ultrasoni c lixiviation using nitric acid, the lead being recuperated as lead su lfate during the acid regeneration. Beside the treatment of waste oils by the traditional methods, this new processing way gives alternative routes, not used usually for waste oils, such as introduction through the blowpipes of a blast furnace, addition to the coal in coke oven p lants, coprocessing with coal in liquefaction or gasification plants, or even in copyrolysis with coal.