FIELD: chemical industry. SUBSTANCE: liquid oil-containing slurry is hardened with mixture which contains 30-50% portland cement and 50-70 peat, preferably heat treated at 200-400 C. Preferred composition makes it possible to increase decontamination of liquid oil-containing slurries till they are hardened to composite materials from which oil hydrocarbons are extracted with water and water extract has COM of 310-850 mg/l which index is by 10-15 times lower than that of slurry. EFFECT: improved properties of the oil- containing slurries. 2 cl, 1 tbl
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