模拟含铀废液中沥青铀矿形成机理探讨

DISCUSSION ON FORMING MECHANISM OF URANINITE FROM SIMULANT URANIUM-CONTAINING WASTEWATER

在利用沥青铀矿结晶法处理含铀废液的20组实验中发现,由于实验条件与溶液含铀浓度的不同,除直接可以形成沥青铀矿外,还形成了其他终极产物及中间过渡产物。对反应过程的观察以及对产物X射线衍射、红外光谱及其能谱分析结果的研究表明,在酸性条件下,较高的温度与较高的铀浓度有利于直接形成沥青铀矿,否则会先形成水合氢氧化铀酰、UO2和UO3的混合物、UO3等中间产物,再进一步形成沥青铀矿,或者反应止步于单质S、UO2和UO3的混合物。

20experiments of treating uranium-containing waste indicate that different experimental conditions and uranium concentration,not only form uraninite directly,but also produce other ultimate products and transition products.Analysis by observation of the reaction process and by X-ray diffraction,infrared spectrum and energy spectrum shows that under the acidic conditions,high temperature and high uraninium concentration are favorable for the direct formation of uraninite.Otherwise,it firstly forms the transition products of uranyl hydroxide hydrate,the mixture of UO2 and UO3,and subsequently form uraninite,or the reactions stop at the elemental sulfur,the mixture of UO2 and UO3.