APT Crystallization Liquor Treatment -- Selective Precipitation Method
The crystalization method of evaporation and extraction method in the preparation of APT will produce crystallization liquor, leaving about 5% -10% of the WO3 and part of the S, P, As, Mo, K, Na and other impurities.
Resulting in it can not directly return to the process of use. In order to improve the metal recycle, it is necessary to set up auxiliary processes to recycle WO3 in the APT crystallization liquor.
Selective precipitation method is developed from the tungsten and molybdenum separation technology. Scholars have found that the use of tungsten, molybdenum compounds of some of the structure and nature of the differences, learn from the successful experience of mineral processing flotation synthesis, synthesis of a precipitant, it can interact with molybdenum and other impurities to form a very small solubility of the compound, and the tungsten compounds remain in the solution to achieve selective separation of tungsten and impurities.
In the treatment of ammonium paratungstate crystallization liquor, some scholars use M115-a treatment of crystallization liquor, the mass concentration of Mo in the liquor is 0.1 ~ 0.5 g / L, WO3 is 15 ~ 18 g / L, after adding the precipitant, the Mo content of the liquor can be reduced to below 0.005 g / L, and the valent metal tungsten is retained in the solution. Compared with artificial scheelite method, WO3 recycle rate can be increased by 10%, the method has a wide adaptability, it can be used to connect with the classic process, and can also use ion exchange process,the advantage is that the process and equipment is simple, and it's low cost. It should be noted that the use of selective precipitation method, direct evaporation of the APT obtained by the particle size and crystal distribution and other physical and chemical properties are too uniform, will affect the quality of products after calcination.
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