Ammonium paratungstate is produced separating tungsten from its ore. Once the ammonium paratungstate is prepared, it is heated to its decomposition temperature, 600°C. Left over is WO3, tungsten oxide. From there, the oxide is heated in an atmosphere of hydroge, reducing the tungsten to elemental powder, leaving behind water vapor. From there, the tungsten powder can be fused into any number of things, from wire to bars to other shapes.
I.E. mechanical activating caustic decomposition and removing molybdenum from tungstate soluton by ion exchange method are used in this technological process for treating low grade tungsten concentrate with a low concent of WO3 and a high content of calcium and impurities to produce APT of high purity. The combination of whole technological process is reasonable and has the advantages of shorter high recovery of tungsten and high purity of product.
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