Influence of Production Conditions on Ammonium Paratungstate Nature

:In tungsten hy drometallurgical process , ammonium paratungstate nature affects directly tungsten powder nature , so it is very important to prepare good physical properties ammonium paratungstate .In this article , the relations between ammonium paratungstate physical properties and control conditionsare summarized .The focus of this article is on influencing mechanisms of some factors on ammonium paratungstate physical properties .The factores are crystallizationmethod , temperature , degree of supersaturation of solutio n(WO3 initial concentration , NH4Cl concentration , impurities in solution),pH range , agitation rate , seed crystal , supplements (NH4)2WO3 solution , crystallization period , crystallization end point mother liquor density , surfactant , vacuum degree and so on .

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