Studying Ammonium Paratungstate Production from Low-quality Ores

In this research, experiments on the production of ammonium paratungstate by the base-leaching process from rough tungsten ores produced by local individual miners in Jiangxi were carried out.The experimental results show the chemical components and properties of run-of-mine ore, the reaction temperature and pressure and the caustic soda concentration all have remarkable effects on the leaching rate. Technologically,by applying dispensation techniques and adding scheelite-decomposing agents the problem due to the high content of silicon and calcium in the ore can be solved . And a new process of tungsten production by the base-leaching method which had not been reported before was developed . By this process chemical reaction will go on without let-up during the operation while by the old one there are times when chemical reaction comes to be in equilibriumum and stops , and so the recovery rate can be noticeably increased , in fact,it reaches 99%.

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