Abstract:The extraction system (N235 + sec-octanol + sulfonated kerosene) + ammonia water back extraction system was proposed to study recovery of molybdenum from raffinate of vanadium extraction from waste petrochemical catalyst. Effects of factors on molybdenum extraction rate and back extraction rate were investigated to obtain the optimal conditions, and ammonium molybdate products were prepared from molybdenum back extraction solution. The results show that extraction rate of molybdenum is 99.23% under the conditions including initial pH value of 2.0, 20% N235 + 5% sec-octanol + 75% sulfonated kerosene, O/A=1/5, and extraction time of 5 min. Back extraction rate of molybdenum is 99.36% under the conditions including O/A=5/1, volume concentration of NH3?H2O of 15%, and back extraction time of 3 min. The concentration of Mo in back extraction solution can meet the requirement of molybdenum precipitation, which can be used to prepare ammonium molybdate products by acid precipitation crystallization method. Molybdenum is precipitated as ammonium tetracolybdate product with purity of 99.62%. The ammonium molybdate products conform to the standard of GB/T 3460—2007-MSA-3.