The Self-Reduction during the Thermal Decomposition of an Ammonium Molybdate

In the hydrometallurgical process of molybdenum using ammonia solution, ammonium paramolybdate tetrahydrate (APT: (NH4)6Mo7O24·4H2O) is produced as an intermediate product after a crystallization step. ATP then thermally decomposed at high temperature to give MoO3, which reduced by hydrogen gas in two-stage reduce metal powder final product. If APT pre-dried appropriately low remove crystal water corresponding 4 mol per APT, it changes into (NH4)4Mo5O17, and content residual ammonia, can be utilized reductant, molybdate increases. this regard, self-reducing potential (NH4)4Mo5O17 was examined study through effectiveness analysis component reductant for primary reduction series experimental work on thermal decomposition inert atmosphere, maximum self-reduction degree 18% achieved. Based result, expected that manufactured more effective way than conventional processes terms consumption reaction time.