Single Crystal Ammonium Paratungstate Preparation

The crystal properties of ammonium paratungstate like crystal morphology, average particle size, particle size distribution, apparent density and flow ability affect the properties of tungsten powder, tungsten wire and tungsten alloy. Single crystal ammonium paratungstate due to its eminent physical properties has become ideal raw materials for preparing tungsten products.

Based on crystallization theory of single crystal ammonium paratungstate, the influences of crystallization device, stirring speed, temperature on crystallization agglomeration of ammonium paratungstate were studies. The results show that the optimal stirring speed is determined as 30, 50, 70r/min, respectively in different developmental stages of crystallization. Under optimal conditions, single crystal rate arrives to optimal value. Suitably reducing pre-crystallization temperature, single ammonium paratungstate crystal rate has more space for enhance. When crystallization temperature is 80 degree Celsius, crystal rate was 96% to achieve the best value. The fluid layer flow control technology and devices for single ammonium paratungstate crystal preparation can effectively reduce collisions between grains, so that the ammonium paratungstate powder single crystal rate can arrive at more than 90%.



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