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氧化鉭價(jià)格

氧化鉭 更多供應(yīng)商 1314-61-0 氧化鉭 價(jià)格

性狀
菱形柱狀體。相對(duì)密度8.2。熔點(diǎn)1872℃±10℃。溶于熔融硫酸氫鉀和氫氟酸,不溶于水和其他酸。
所屬類別
無(wú)機(jī)化工產(chǎn)品: 無(wú)機(jī)鹽: 其他無(wú)機(jī)化合物
用途與作用
供拉鉭酸鋰單晶和制造高折射低色散特種光學(xué)玻璃用,化工中可作催化劑。
合成工藝與制法
氟鉭酸鉀法將氟鉭酸鉀與硫酸加熱至400℃,反應(yīng)物加水至沸,經(jīng)充分稀釋使酸化溶液水解,生成水合氧化物沉淀,再經(jīng)分離、洗滌、烘干,得五氧化二鉭成品。其反應(yīng)式如下:
2K2TaF7+2H2SO4+5H2O→Ta2O5+2K2SO4+14HF
金屬鉭氧化法將金屬鉭片溶于硝酸、氫氟酸混酸中,經(jīng)萃取提純,用氨水沉淀氫氧化鉭,再經(jīng)水洗、烘干、灼燒、磨細(xì),得五氧化二鉭成品。其反應(yīng)式如下:
3Ta+5HNO3+21HF→3H2TaF7+5NO+10H2O
H2TaF7+7NH4OH→Ta(OH)5+7NH4F+2H2O
2Ta(OH)5→Ta2O5+5H2O
參考質(zhì)量標(biāo)準(zhǔn)
國(guó)家標(biāo)準(zhǔn)GB 10577—89
指標(biāo)名稱指標(biāo)
特級(jí)045一級(jí)04二級(jí)035
外觀白色粉末,無(wú)肉眼可見的夾雜物
鈮(Nb)/%≤0.00150.0030.008
鋁(A1)/%≤0.00030.00050.001
硼(B)/%≤0.0001--
鉍(Bi)/%≤0.0001--
鉻(Cr)/%≤0.00010.00030.001
銅(Cu)/%≤0.00030.00050.001
氟(F)/%≤0.0030.0070.015
鐵(Fe)/%≤0.00030.00050.001
錳(Mn)/%≤0.00010.00030.0005
鉬(Mo)/%≤0.00030.00050.001
鎳(Ni)/%≤0.00010.00030.001
鉛(Pb)/%≤0.0003--
硅(Si)/%≤0.00070.00130.005
錫(Sn)/%≤0.00010.00030.0005
鈦(Ti)/%≤0.00010.00030.0005
鎢(W)/%≤0.00030.00050.001


氧化鉭價(jià)格(試劑級(jí))

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鉭價(jià)格(試劑級(jí)) 氧化鉭價(jià)格(試劑級(jí)) 乙醇鉭價(jià)格(試劑級(jí)) 鉭酸鋰價(jià)格(試劑級(jí))