APT Crystallization Liquor Treatment -- Artificial Scheelite Method
The crystalization method of evaporation and extraction method in the preparation of APT will produce crystallization liquor, leaving about 5% -10% of the WO 3 and part of the S, P, As, Mo, K, Na and other impurities. It resulting in it can not directly return to the process, in order to improve the recycle of metal, it is necessary to set up auxiliary processes to recycle WO 3 in the liquor. Artificial scheelite was the method of ammonium paratungstate crystallization liquor treatment, the main precipitant is CaCl 2 , the main purpose of the artificial scheelite method is to convert the WO 3 in the crystallization liquor into a very insoluble calcium tungstate (artificial scheelite), then return to the acid process or hot ball milling process. Artificial scheelite made in three directions: 1. CaCl 2 precipitated artificial scheelite → acid decomposition and partial molybdenum → crude tungstic acid → return to the main...