???? ?????? ???? ??????? ???????????
???? ?????? ????? paratungstate ??????? (APT) ?????? ???? ????? ?? ? '?? ????? ?? ???? ???? ????? ???. ?????? ???:
1. ????? ?? ????????? ?? ??????? (NH 4 ) 2 ????? WO 4 ???? ???? ??????? ?? ????????? ???? ????? (????????? ????? ?? ??? ???? ?? ?? ???? ???????? ?? APT, ???? ???, 70 ~ 75 ° C ???? ??????? ????????, ?????? ? 90 ????? ?????? ????? ??????? ????, ???? ????????? ????? 50 ????? ?????? ????? ??????? ????);
2. ??? ??? ?????? 10% ~ 20% ?????? ????? ??????????? ??? ????? ????, ?????? ?? ????? ????? ?? ??? pH ??? ????? ? 7 ~ 7.5,
3. ????? 0.5 ??? ??? ????? ??? ??? ????? ?? ???? pH ????, ????? ??? ???? ?? 8 ~ 10h ?? 90% ~ 95% ?? ??????? ? ??????? ??????? ???? ????? ?? paratungstate ???????,
4. ??? ???? ?? ?????, ????? ?? ????? ?? ????? 1% ?? ????? ????? ???????.
????? = "??????"> ????? ???? ??????? ?????, ???? ??????? ?? ?? ???????? ?? ????? ?????? ????, ?????? ??????? ?????, ?? ????? ??????? ???? APT; ?? ???, ??? ???? ?????? ???? ?????? ????? ??????????? ??? ???? ???? ????? ???????, ??? ??????? ??? ??????? ???? ??? ????? ?? ???? ?? ????? ?????? ??? ???????.
?????? ??????:
