Abstract:Tungsten, molybdenum, and vanadium were comprehensively recovered from waste catalyst with a series of processes including two-stage countercurrent leaching, vanadium precipitation, recrystallization after ammonia dissolving, and purification. The results show that leaching rate of W, Mo, V is all 95% above, and comprehensive recovery is over 90% under the optimum conditions including leaching temperature of 70 ℃, leaching time of 3.5 h, sodium carbonate concentration of 350 g/L, and ratio of liquid to solid of 3∶1.