THE STUDY OF THE CONDITIONS FOR THE RECOVERY OF VANADIUM, GALLIUM AND NICKEL FROM THE ASH RESIDUE AT BURNING OF FUEL OIL BY SINTER AND LEACHING METHODS

The conditions for the extraction of gallium, vanadium and nickel from the ash residues resulting at the burning of high-sulfur chemicals by sintering with soda and leaching with water have been examined. A new technology has been developed, characterized by higher extraction of gallium, vanadium and nick-el, which is environmentally friendly for extracting Ga, V and Ni from the ash residue of heavy oil. In order to completely extract Ga, V and Ni from the ash residue, its thermal oxidation with alkaline (Na2CO3) additives was previously carried out. Installed the optimal conditions of the process. The re-sults showed that the degree of leaching of vanadium and gallium was 98.8 and 97.5%, respectively, in the experimental conditions the sintering temperature was 8000 C, the sintering time was 1.5 hours, the optimum amount of soda needed for sintering was 1:1 by weight, the leaching temperature was 90–950C, the ratio of the liquid-solid phase was (5–10):1 and the leaching time was 2 hours. After the re-covery of Ga and V, the residue was followed leaching with a sulfuric acid solution to recover nickel