According to the type of tungsten concentrate used and the different components of impurities, the production process of APT can be divided into the following types:
(1) Wolfram tungsten concentrate high-pressure alkali boiling (sodium hydroxide solution)-ion exchange-evaporation crystallization method;
(2) Wolframite concentrate high-pressure alkali boiling (sodium hydroxide solution) – solvent extraction – evaporation crystallization method;
(3) Scheelite concentrate soda boiling – ion exchange – evaporation crystallization method;
(4) Scheelite concentrate soda Pressure cooking – solvent extraction – evaporation crystallization method;
(5) scheelite concentrate caustic soda fluorine salt pressure cooking – ion exchange – evaporation crystallization method;
(6) scheelite concentrate caustic soda fluoride salt pressure cooking – solvent extraction – evaporation crystallization method;
(7) Hydrochloric acid decomposition of scheelite concentrate – ammonia solution – evaporation crystallization method.
Due to the different production processes, the production equipment is also different. The equipment generally used in the evaporative crystallization method is a jacketed heating enamel reactor with a stirring device and a continuous crystallizer; other production equipment includes liquid nitrogen cooling vacuum dryers, etc.
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