In the recent years , many users at home and abroad have strict quality requirement not only in chemical composition but also in physical properties . Including particle-size and distribution (or apparent density ), crystal shape and so on .therefore, it is important to investigate the preparation of APT with coarse grain has been investigated systematically. A new technology for the crystallization of ammonium paratungstate with coarse grain has been studied. The factors influencing the physic-chemical properties of ammonium paratungstate crystal, such as temperature ,concentration in the process, and the addition of seed crystal and agitation with air is also in favor of the system. Ammonium paratungstate crystal with particle size of 36-42um and apparent density of 2.0-2.2g/cn-3 were obtained by controlling suitable technological parameters.
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