Method for separating and purifying ammonium paratungstate from ammonium tungstate solution

The invention discloses a method for separating and purifying ammonium paratungstate from an ammonium tungstate solution. The method comprises the steps of firstly, filling the ammonium tungstate solution with nitrogen for pretreating; then, adding a compound active reagent, stirring by using a graphite stirring rod, and cooling in a staged manner; the obtained ammonium paratungstate crystals are higher in purity and small in particle sizes, have regular hexahedral crystal structures, and have less impurities such as WO3, Mo and As, thus having remarkable social and economic benefits. 本发明公开了种在钨酸铵溶液中分离提纯仲钨酸铵的方法，将钨酸铵溶液先通入氮气进行预处理，再添加复合活性试剂，用石墨搅拌棒进行搅拌，阶段降温，得到的仲钨酸铵晶体纯度较高、粒径小，具有规则六面体结晶结构，WO、Mo、As等杂质少，具有显著的社会、经济效益。