摘要
用硫酸、氢氟酸、过氧化氢分解矿样,在6mol/L硫酸介质中,用亚钛将铀(Ⅵ)还原成铀(Ⅳ)。用亚硝酸钠氧化过剩的亚钛,过量亚硝酸钠用尿素破坏,以邻二氮菲亚铁为指示剂,钒酸铵容量法测定铀。本法w(U)测定下限为0 03%,RSD优于3%,回收率为95%～105%,与铀矿石标准样品对照分析,误差小于2%。
The uranium ore sample is dissolved with H_2SO_4, HF and H_2O_2. Uranium (Ⅵ) is reduced to uranium (Ⅳ) by titanous. The excess titanous is oxidized with sodium nitrite and excess sodium nitrite is destroyed with urea. Uranium can be determined by ammonium vanadate volumetry in the medium of 6 mol/L sulfuric acid taking o-phenanthroline ferrous sulfate as indicators. The determination limit is 0.03%, the RSD is better than 3%, the recovery is 95～105%. The error is less than 2% compared with the standard sample of uranium ore.
出处
《铀矿冶》
CAS
2004年第3期147-150,共4页
Uranium Mining and Metallurgy
