期刊论文

Li, Mi(enemy_1983@163.com)

中文

中国矿业大学学报

1000-1964

2016

45

3

639-645

10.13247/j.cnki.jcumt.000521

51404141:国家自然科学基金 2015RS4039:湖南省科技计划 2015M572255:中国博士后科学基金 2014KS32:衡阳市科学技术发展计划

本校为第一且通讯机构

为了从低品位铀尾矿中回收铀资源,在详细分析了铀尾矿工艺矿物学性质的基础上,提出了以硫酸为浸出剂,HF和HClO_4为强化剂的氧化强化浸铀工艺,研究了工艺参数对铀浸出的影响,并通过X射线衍射仪、激光粒度仪及扫描电镜等手段分析铀尾矿浸出过程中的物相、粒度及形貌特征变化,揭示了HF和HClO_4对铀尾矿浸出的强化作用机理.研究结果表明:HF可分解硅酸盐类矿物结构,而HClO_4可对脉石颗粒表面造成"溶蚀",二者均可促进脉石颗粒与铀的解离,但HClO_4的作用效果低于HF.当浸出温度为50 ℃,硫酸浓度为1.5 mol/L,浸出时间为80 min,液固质量比为12时,HF和HClO_4对铀的浸出率分别为96%和78%.

Based on the process mineralogy of uranium tailings, extraction of uranium using sulfric acid with HF and HClO4as oxidant agents were proposed to recover uranium resources from uranium tailings. Technological parameters affecting the extraction rate were investigated. Besides, the strengthening mechanism of HF and HClO4during leaching process were revealed by analyzing the variety of phase transformation, particle size distribution and morphology features in residues through X-ray difraction, laser particle analyzer and scanning electron microscrope. Results indicate that both HF and HClO4have...