Abstract: A method to process contaminated soil or waste in high temperature. The material (4, 5) to be processed is conducted to a first rotating drum oven (1), where the material is heated to a temperature of 230-280° C., at which components of the material evaporate and gasify. The evaporated and gasified components are discharged from the drum oven (1) and condensed. The pre-processed material (6) is conducted to a second rotating drum oven (2), where the material is heated to a temperature of 1000-1200° C., whereupon the material forms granules due to the rotating motion of the drum oven (2). The combustion gases (13) from the second drum oven are conducted through a heat exchanger (9), and oxygen-rich gas, such as air (8), is heated in the heat exchanger (9) and supplied (10 and 14) for burning the fuel (7) of the second drum oven and for heating the inner casing of the first drum oven (1).

Abstract: The invention relates to a method and apparatus for processing oil drilling waste. According to the invention, oil drilling waste of one or more types is selected, and is introduced from the feeding tanks into a rotating kiln; and in the kiln, the oil drilling waste is processed at a temperature of 110 to 13500° C. to form granules having a compact-coated surface.