Method for Recycling Tungsten and Ammonia in One Step From Ammonium Paratungstate Crystallization Mother Solution Smelt Through Tungsten

The invention discloses a method for recycling tungsten and ammonia in one step from an ammonium paratungstate crystallization mother solution smelt through tungsten.

After the ammonium paratungstate (APT) is subjected to evaporative crystallization, a mother solution is pumped into a reaction kettle for stripping treatment, calcium oxide with content above 90% or calcium hydroxide with content above 95% are added into the mother solution, a stripping process which is commonly used in the crystallization mother solution in the APT preparation process is utilized to recycle the ammonia, the reaction temperature is in a range from 25 DEG C to 90 DEG C, when the ammonia is subjected to gas-liquid separation through condensation concentration, the ammonia is sprayed with a hydrochloric acid to prepare ammonium chloride to return to a main process to prepare an analytical solution, white tungsten slag returns to a pressure boiling process, when a potential of hydrogen (pH) value of a reaction system is maintained in a range from 9 to 11 and concentration of ammonia nitrogen in water is reduced to about 30mg/L, the reaction is finished, and a waste liquid free of the ammonia nitrogen is subjected to a mixing treatment with an ion exchange post-liquid which is generated in the main process working procedure.

The method has the advantages that the process procedures are greatly simplified, the tungsten deposition rate is high, the process is simple, the operation is easy, and the treating cost is slightly low.


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