Acid Leaching Extraction of Mo, V, and Ni Compounds from the Semicoking Product of Tar Hydroconversion Residue

Abstract

The results of studies of the extraction of Mo, V, and Ni compounds contained in the semicoking product of tar hydroconversion residue by an acid leaching method are presented. The aqueous solutions of HNO₃, H₂SO₄, and H₂O₂ were used as reagents for the leaching. Conditions for the extraction of 80–90% metals from the semicoke were determined. The possibility of decreasing the sulfur content of the semicoke by a factor of more than 2 was demonstrated. According to the calculated kinetic characteristics, the reaction of molybdenum leaching by the test reagents corresponds to a higher degree to a first-order kinetic equation (R² > 98%).