Method for recovering molybdenum from low-molybdenum ammonia leaching residues

The invention belongs to the field of hydrometallurgy, and relates to a method for leaching and recovering molybdenum from low-molybdenum ammonia leaching residues. The method specifically comprises the following steps that S1) the ammonia-impregnated low-molybdenum ammonia leaching residues are dehydrated and slurried for use; S2) the slurried low-molybdenum ammonia is added into a reaction kettle, pressurized and heated, and a pressure-maintaining reaction is performed to obtain a reaction solution and molybdenum slag; S3) the reaction solution is separated from the molybdenum slag, negativepressure concentration is carried out on the reaction solution, and acid precipitation filtration is carried out on the concentrated solution to form a molybdate filter cake; and S4) the filter cakereturns to the ammonium molybdate production process, and an ammonium molybdate product meeting the GB/T3460-2017MSA-1 level is produced. The method has the beneficial effects that due to the adoptionof the technical scheme, t