New Calcine Process for Ammonium Paratungstate to Tungsten Trioxide by Microwave Heating

The new process of calcine for ammonium paratungstate to tungsten trioxide by microwave was investigated. The results of experiment show that the maximum decomposing rate of ammonium paratungstate is 96 .67 % after 4 min bymicrowave heating. In the new calcining process, the primary influnce factor is ammonium paratungstate' s weight, the secondary factors are time and microwave power. In this experiment range, the optimum conditions are that the microwave power is 650 W, the calcining time is 4 min, and the ammonium paratungstate′s weight is 10g .

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