???? ????? ????? ?????? ???? ??????? ???????????
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???? ????? ???? ????? ??? ????? paratungstate ??????? (APT) ?? ????? ????, ??? ???? ????? ?? ??????? ???? ?????, ???? ????? ???????? ? ??????? ???? ????? ??? ??? ???? ??????? ???????, ????? ??? ???? APT ?? ??? ??????? ?????, ?? ?????? ??? ?????:
1. ????? ??????? ???? ????? ?? ??? ???? ?? ??????? ???? (Na 2 WO 4 ) ? ?????? ??????? ?? ??? ???? ????? (NaCO 3 ), ? ????? ??? ???? ?? ?????, ?????, ????? ????? ???? ????? ????? ??????? ???? ??, ??????? ?????? ?? ??????:
Na2CO3+FeWO4=FeO↓+ Na2WO4+CO2↑
Na2CO3+MnWO4=MnO↓+ Na2WO4+CO2↑;
2. ????? ???? ????? (CaCl 2 ) ????? ???? ????? ??????? ???? ????? ??????? ?????? ??????? ???? (CaWO 4 ), ?????? ?? scheelite ????????, ?????? ??? ?????? You
Na2WO4+ CaCl2=CaWO4↓+2NaCl
3. ???? ?? scheelite ???????? ?? ????? ??? ???? ????? ????????, ????? ??? ?????? ??? ?????? ???? ???? ????? ????? ??????? ???????, ?????? ?? ???????? ??????? ??????? ?????, ?????? ??? ??????:
CaWO4+2HCl=H2WO4↓+ CaCl2
H2WO4+2NH4OH=(NH4)2WO4+2H2O
4. ????? ??????? ????? ??????? ??????? ??? ???? APT.




