???? ???? ??????? Metatungstate

???? ?????
???? ????? ?? ????? ??????? Metatungstate ????? ??? ????? ????? ??? ??????? Metatungstate: ???? ??????? ??? ??? ????? Metatungstate ?????? ??????? ?? WO312- ~ 30 ????? ?? ?????. ????? = 1: 20: paratungstate ??????? ????? ?? ??? ????? 3 ~ 5 ?? ????? ?????? ???? ??? ????? ??????? paratungstate, ??? ?????? ???? 1 ?????: (3 ~ 4), ??? ?- pH ?? 2 ~ 4, ????? ????? ????, ??????? ?????? ?? 1.18 ~ 1.20, ????? ?? 80 ~ 90 ℃, ???????? ????? ???? Ph ????? ??? ????, ????? ?????? ???? ???? 4H, ???????, ????? supernatant ??? WO3 ???? ??? ?? 50, ????? ????? ????? ????, ????, ??????? ?????, ?????? ?? 80 ℃ ?????.

Tungstic ????? ????
???? ??????? ???? tungstic ????? Tungstate ??????, ?????? ?????? Deionized ?? ??????, ????? ?? ??? ??????, Ph = 8, ?????? ????? ?? ??? ????? ????? ?????, ????? ??? ?????? ?????? ?????? ???? ?? ??? ?- pH ????? 2 ~ 4 ????? ????, ????? ?? ?????? ????? ?? 1.5 ~ 2, ?????? ?????, ????? ??????. ?????? ?????? ?? ?????? ?????, ??????? ???? ?????, ?????? ? 80 ℃ ?????, ????? ????? ?? ?????.

???? ????? ????
?????? ????? ?? ??????? paratungstate ??? ???? ??????? Metatungstate: paratungstate ??????? ???? ???? ?? ??? ????? ?????? ???? ?????? ???? ???? ?????? ???? ?????, ?????, ???? ???????? ????? ???? 200 ~ 280 ℃, ????? ?? ? 1 ?. ???? ?????? ????, ????? ???? paratungstate ??????? ??? 5 ~ 6-. ????? ???????? ??????? ???? ???? ?????, ????? ???? ????? ?? ??????, ??? ?- pH ????? ????? 3 ?? 4, ? slurry ????? 90 ℃. ???? ????? ??? ??????? ???? Metatungstate ?? 50 ???? ???? ????? ????? ?????, ???????, ???? ????? ???? ?????? ?? 20- ????? ???????, ???? ?????. ??? ?? ???? ????? ????? ???? ????? ??? ???? ?? ??? ????? ?????. ???? 45 ~ 50 ??????? Metatungstate ??? ????? ????? ????? ?????????? ??????? ?????, ???? ?? ???????? ????? ??? 250 ~ 300 ℃, ???????? ???? 90 ~ 95 ℃, ????? ?????? ???? ?????, ???? ??????? ??? 200 ??? ?????? 95%, ??? & lt ????;. 1.5 -

???? ?????? ???? ????? ???? ??????? ????? Tungstate ??????? ??? ????? ?????? extractant ?????? ??? (2 ethylhexyl) ???? (D2EHPA) ?? ???? ????? ????? ?????? ???? (TBP) ????? ??? ??? ?? ???? ???????, Tungstate ??????? ?????? ??? ???????, ??? ?- pH 2 ~ 4, ?????? ?????? ????? ????? ??????? Metatungstate. ????? ??????, ?????, ????? ?????.

???? ????? ???
?????? ????? ????? ??????? paratungstate ??????? ?????? ????? ???, ???? ??????? Metatungstate: ? 130 ~ 140 ℃ ????? ??????? paratungstate ? 1 ?? 8 ????, ??????? ?????? ?????, 80 ~ 100 ℃ ?????? ???? 2 ~ 6 ????, ????? ????? ??????? Metatungstate. ????? ???????, ?????, ????? ????? ?? ?????. ????? ?????????????? ??????? Tungstate ??????? ??????? paratungstate ?????? ??? ??? ?????????????? ?? ??????? Metatungstate: ??????? paratungstate ???? ?? ??????, ???? ??? ????? ???? ???, ??? ??????? ??? ???? ?????? ???? ?? ??????, ?? ?????? ??????? ????? Metatungstate ??????. ????? ?????? ????? ????? ??????? ????? Metatungstate, ?? ?? ????? ??"? ?? ????? ?? ??????? Metatungstate.