A Method of Extracting From the High Molybdenum Scheelite Tungsten, Molybdenum

A tungsten, molybdenum is extracted from the high molybdenum scheelite.

Process: the high molybdenum scheelite sulfuric acid - mixing phosphoric acid leaching; leachate was isolated using a cooling crystallization method after phosphotungstic acid crystals dissolve in acid solution, the secondary cooling crystallization, and then dissolved ammonia - ammonium magnesium law except phosphorus - in addition to molybdenum selective precipitation - evaporation and crystallization treatment can have 0 APT line with national standards; a cooling crystallization mother liquor by extraction of molybdenum mention - ammonium stripping - impurity - after the transfer process can be obtained acid molybdate ; the rich more than the acid raffinate and the secondary cooling crystallization mother returned directly leaching, to achieve the cycle acids.

The present invention enables efficient tungsten and molybdenum, atmospheric extraction, tungsten, molybdenum leaching rate of more than 98.5%; freeze crystallization and extraction process can effectively achieve complete separation of tungsten, molybdenum, reducing the processing burden on the follow-up process; leaching process is simple acid consumption less, and to achieve most of the acid leaching cycle, which greatly reduces the cost of production and waste discharge.


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