Two new technologies，i.e. mechanical activating caustic decomposition and removing molybdenum from tungstate solution 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.
This technological process effectively utilized the resources flow grade tungsten concentrate with a high content of calcium and impurities in China and extended the utilization factor of mineral resources. The production cost is low . According to the statistical results of Siquan Chemical Industril Plant in 1992, additional profit of 5800 Yuan per t on APT may be obtained. Therefore, the social and economical benefits are obvious.
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