???????? ?????
???????
???????? ????? ????? ??? ???? ??????? ??? ??????? ???? ????? ??18. ???? ???? Woulfe ??? ?? ????? ????? ????? ?? ?????? ????????? ??????????. ???????? ??? ?? ????? ??????? ???? ??????? ????? ?? ?????? "W" ??????? ?????. ???? ????????? ??????? ???? ??????? ??? ????????? ????? ?? ?????? ??? scheelite ????????.
?? ??? 1841? ??? ??????? ???? ????? Oxland ???? ????????? ?????? ?????? ???????? ???? ????? ???????? ????????. ?? ???? ????? ?????? ????? ??? ???? ?????? ?????? ????? ???????? ???????? ?????. ???????? ????? ?????????
????? ????????? ???????? (??????) ????? (WO2)? ???????? (VI) ????? (WO3)? ???????? ?????? ???????? (VI) ???? ?????? ???????? ??????? CAS # 1314-35-8 (WO3)? ditungsten pentaoxide? undecaoxide tetratungsten? ????? ????????? ????? ???????? (W2O5)? scheelite? ??????????? ?????? ferberitetungsten (W4O11)? ?????
???????? (VI) ?????? ??????? ???? ???? ????? ???????? ?? ???????? ??????? WO3? ?? ???? ??????? ????? ??? ????????? ????????? ???????? ???????. ???? ?????? ???? ????? ????? ?? ??????? ?? ???????? ?? ???????. ??? ??????? ?? ????? ???????? ?? ???????? ?????? WO3. ???? ?? ??????? ?? ??? ??????? ?? ?????????? ???? ???????? ????? ???? ?????? ?????.
2WO3 + 3C + heat → 2W + 3CO2
WO3 + 3H2 + heat → W + 3H2O
???? ???????? (VI) ????? ???? ????? ?? ??? ??????? ????? ???? ???????: tungstite WO3 ? H2O? meymacite WO3 ? 2H2O ?hydrotungstite (?? ??? ????? meymacite? ???? ?? ??? ??????? ??? ?? ????? H2WO4). ??? ??????? ????? ??? ??????? ???????? ???????? ????? ???.
???????? ????? ???? ?? ???? ?????? ?? ??? ??? ??????. CaWO4? ?? scheelite? ???? ??????? ?? ??? ????????????? ?????? ???? ??????? ???? ????? ??? WO3 ?????? ?? ????? ????? ?????.
CaWO4 + 2HCl → CaCl2 + H2WO4
H2WO4 + heat → H2O + WO3
????? ????? ???? ????? ?????? WO3 ?? ?? ???? ????? ?? ??????????? ????????? (APT) ?? ?? ???? ????????:
(NH4)10[H2W12O42]?4H2O → 12 WO3 + 10NH3 + 11H2O
????
??????? ??????? ?????????? ????? ??? ????? ???????. ??? ????? ??????? ?? ???? ????? ???? ?? 740 ???? ?????? ????? ?????? ??????? 330-740 ???? ?????? ????? 17-330 ???? ?????? ?triclinic ?? -50 ??? 17 ???? ?????. ???? ?????? ????? ?? WO3 ?? ????? ?? ?????? ?????? P21 / ?.
???????????
???????? ?????? ????? ?????? ????? ?? ?????? ???????. ?? ???? ?? ??????? ??? ???????? ?? ????? ?????? ???????? ????????? ???? ?????? ???????? ??????? ?????? ??????? ?????? ????????? ?????. ???? ???? ???? ???? ??????? WO3 ???? ???? ?? ????????? ?????????.
?? ??????? ???????? ???????? ???????? ????? ?? ????? ??????? ????????? ?? ??????? ??????. ??? ??????? ???????? ??????? ???????? ?? ????? ????? ?????? ??????? ?? ????? ??????. ??? ???? ???????? ???? ???????? ?????? ???? ??????? ?? ????? ??? ?? ????. ??????? ???? ??? ????????? ?? ????????? ??????? ???? ????? ???? ??? ??????? ????? ?? ??? ??????? ???? ?????? 2008-2009 ??????? ????? ???.
2010- AIST ?????? ?????? ???? ?? 19? ?? ????? ?????? ???? ?? ???????? ????? photocatalys ????? ????????.
???? |
WO3 (%,min.) |
???????(%,max. ) |
|||||
As |
Fe |
Ca |
(K+Na) |
Co |
Mg |
||
Special |
88.8 |
0.001 |
0.001 |
0.001 |
0.002 |
0.0005 |
0.0005 |
1st |
88.5 |
0.001 |
0.001 |
0.001 |
0.002 |
0.001 |
0.0005 |
Mn |
Ni |
Si |
Ti |
Mo |
Cu |
V |
P |
0.0005 |
0.0005 |
0.002 |
0.0005 |
0.002 |
0.0005 |
0.0005 |
0.0007 |
-- |
0.0007 |
0.002 |
0.001 |
0.005 |
0.0007 |
0.001 |
0.0007 |
S |
Cr |
Al |
Sb |
Pb |
Sn |
Bi |
Cd |
0.0007 |
0.0003 |
0.0003 |
0.0002 |
0.0001 |
0.0001 |
0.0001 |
0.0001 |
0.0007 |
-- |
0.0005 |
0.0005 |
0.0001 |
0.0001 |
0.0001 |
0.0001 |
???? |
????? ?????(%) |
????? ?????(g/cm3) |
??? ?????? (mesh) |
??? |
11.2 |
2~2.4 |
-80,100% |
1st |
11.5 |
2~2.4 |
- |
???????: ?? ?????? ???? ????? ?? ????? ?? ??????? ??????????? ?? 100 ?? 200 ??? ???? ??? ?????.
??????: ?? ??????? ???? ???????? ???? ????????.
??? ??? ???? ?? ????? ?? ???????? ???? ?????? ??? ????? ?? ??????? ??? ?? ???? ?????? ??????????: sales@chinatungsten.com or by telephone: +86 592 5129696.
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2.???????? ?????????? ????? ????????