Tungsten Concentrate Preparing Ammonium Paratungstate

In order to improve the quality of tungsten products and the export need of tungsten wire, the method for producing high purity ammonium paratungstate is under research. In order to reduce producing cost, improve producing efficiency of tungsten, ammonium paratungstate prepared by tungsten concentrate is studied.

Tungsten concentrate preparing ammonium paratungstate mainly uses soda lye under alkaline leaching tungsten concentrate. During the processing procedure, the alkaline using amount is 2-3.5 times more than the theoretically amount. The first step is evaporation and crystalline of sodium tungstate. Firstly evaporate sodium tungstate in the reaction tower, coarse sodium tungstate crystal is produced. Then add water and hydrochloric acid into it and then acid decomposition happens. After acid decomposition, tungstic acid is produced and was mixed up with ammonium. It is then being processed under 80-95 degree Celsius for 4-6 hours, evaporation amount is between 60-70. The final process is crystalline, filtering, washing and dry. Then the finished ammonium paratungstate is made. 




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