PROCESS FOR PRODUCING AMMONIUM POLYTHIOMOLYBDATE OF THE FORMULA (NH4)2MO3S13.N H2O

摘要

There is disclosed a process for producing an ammonium polythiomolybdate of the formula (NH4)2MO3S13.nH2O where n is 0, 1 or 2 comprising reacting an aqueous ammoniacal molybdate solution with hydrogen sulfide gas at superatmospheric pressure until the H2S is no longer absorbed by the solution, said solution and said gas being in a closed system and the flow of said gas being regulated at an elevated pressure, to form a slurry consisting essentially of a solid essentially all of which is ammonium tetrathiomolybdate, and thereafter heat soaking the reaction product at elevated temperature in the presence of elemental sulfur to form the desired product.