文献类型：专利

英文题名：Recovery of associated rhenium resources from tailings of leaching of uranium from uranium deposits involves obtaining ammonium rhenate solution from precipitated ammonium nitrate-leached solution, concentrating and purifying

作者：HUA R;ZHANG Z;LUO M;LE Z;LIU Y;YANG Y;XU Y;JIANG X

机构：[1]UNIV EAST CHINA SCI & TECHNOLOGY

申请号：CN106148737-A

申请日：2016-07-06

公开日：2016-11-23

语种：英文

收录：DERWENT

摘要：NOVELTY - Recovery of associated rhenium resources from tailings of in-situ leaching of uranium from sandstone-type uranium deposits involves adding sandstone-type uranium ore containing associated rhenium resources to dilute sulfuric acid solution, filtering, adsorbing uranium from leach solution, precipitating ammonium nitrate-leached uranium solution using sodium hydroxide, drying, obtaining sodium diuranate, processing in presence of macroporous resin, desorbing rhenium from resin, obtaining ammonium rhenate solution, concentrating, purifying and obtaining potassium rhenium product. USE - Recovery of associated rhenium resources from tailings of in-situ leaching of uranium from sandstone-type uranium deposit (claimed). ADVANTAGE - The method efficiently and economically recovers associated rhenium resources with high purity from tailings of in-situ leaching of uranium from sandstone-type uranium deposit, by simple method with high productivity without affecting the environment. DETAILED DESCRIPTION - Sandstone-type uranium ore containing associated rhenium resources is added to dilute sulfuric acid solution containing preset concentration of oxidant, to ensure that leaching solution has pH of 2 or less, soaked at room temperature for 12-24 hours, and filtering to obtain uranium-rhenium mixed solution. Using D263 anion exchange resin as adsorbent, uranium is adsorbed in the leach solution by saturated re-adsorption process using 6% ammonium nitrate. The resin is then returned to adsorption process after transformation. Ammonium nitrate-leached uranium solution is precipitated using sodium hydroxide, and dried to obtain sodium diuranate product. The resultant mixture is then processed in presence of free amines as adsorbent and macroporous resin to ensure preset contact time, and rhenium in the tail liquid is adsorbed. Using preset concentration of ammonia as desorption agent, rhenium is desorbed from the resin and ammonium rhenate solution is obtained. The concentrated ammonium rhenate is further concentrated at preset temperature by evaporation, and the crystals are maintained at preset temperature. The precipitated mother liquor is recycled to the stripping liquid preparation process, and crystals are filtered and purified by recrystallization, to obtain potassium rhenium product.