SEPARATION OF MOLYBDENUM, VANADIUM AND NICKEL BY LIQUID-LIQUID-EXTRACTION

Elements in the ash of asphaltites that is used in thermal central for power generation units are Mo, V, U, Ti and Ni. The main goal of this study was to separate molybdenum, vanadium and nickel from the aqueou s solution. The quantities of the above elements in solution were in t he range of 50-80 ppm. The separate these elements from solution, the liquid-liquid extraction method was applied to samples. Alamine 336 wa s used as extractant. During the reduction-oxidation processes, single and multiple extraction methods were applied to the solution in combi nation. The quantities of molybdenum, vanadium and nickel in the solut ion were determined by a Shimadzu AA-670 model Atomic Absorbtion Spect rometer. 100 % of the molybdenum was isolated from the solution, and d uring the fourth and fifth stages of extraction, approximately 100 % o f the vanadium was isolated from the solution. In this extraction proc ess 12.5 % of the Alamine 336 in kerosene was used. However, this extr actant is not suitable for the isolation of nickel, so nickel was reco vered by precipitation as NiS in 96 % yield. Although in the literatur e vanadium can be extracted in V5+ State with Alamine 336, in our stud ies it was obtained also in V4+ state.