Determination of Uranium and Molybdenum in Separation Process of Uranium and Molybdenum (I):Determination of Uranium

simple and rapid methods for determination of uranium in uranmolybdate,leaching residue,leaching solution,ion exchange resins and uranium chemical concentrates during separation of uranium and molybdenum have been studied The samples of ore and leaching residue are fused with mixed ammonium salt,the resin samples are roasted at high temperature The fused sample is dissolved in phosphoric acid In 60% phosphoric acid medium,uranium(Ⅵ) is reduced to uranium(Ⅳ) by ferrous In 40% phosphoric acid and in the presence of ammonium salt,the excess ferrous is oxidized with sodium nitrite,and excess sodium nitrite is destroyed with urea so as to interference of molybdenum can be eliminated The uranium can be determined by ammonium vanadate volumetric procedure,taking sodium diphenylaminesulfonate and phenyl o amidocarbonic acid as indicators Molybdenum in the samples of high content molybdenum can be separated as molybdenum acid precipitate The uranium products (uranium chemical concentrates)is dissolved with a small amount of hydrochloric acid,then the uranium is titrated directly using ammonium vanadate volumetric procedure The methods are simple and rapid and can be used to determine uranium in various samples The precision of analysis is over ± 10% and recovery rate is 98%～105%.The results are satisfactory