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首页> 外文期刊>World Journal of Nuclear Science and Technology >Recovery of Rare Earth Elements Present in Mining Tails, by Leaching with Nitric and Hydrochloric Solutions
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Recovery of Rare Earth Elements Present in Mining Tails, by Leaching with Nitric and Hydrochloric Solutions

机译：通过用硝酸和盐酸溶液浸出，挖掘矿尾稀土元素的回收率

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The rare earth elements (REE) include the group of 15 lanthanides, scandium and yttrium and have diverse applications in technological and nuclear areas. The existence of REE in massive solid mining wastes generated in leaching processes of copper minerals in the Atacama region of Chile generates the possibility of creating added value to the treatment of this type of waste and supporting the development of a circular economy, generating a useful by-product in different industries. In order to know the behavior of these elements present in the solid carrier waste, a leaching process was carried out by using two agents separately, corresponding to hydrochloric and nitric acid. The technical feasibility to recover REE from carrier tail was demonstrated, the best leaching agent for these elements being a hydrochloric solution, obtaining a maximum recovery efficiency of 64.5%, for an acid concentration: 3M, temperature: 40 ° C and (liquid/solid) ratio: 4. Lanthanum and cerium present the best individual recoveries compared to the other REE, with a maximum efficiency for a hydrochloric solution of 75.7% and 70.0%, respectively. The interaction of operational parameters that most influence the REE recovery corresponds to the temperature and the (liquid/solid) ratio. After 4 hours of leaching, REE recovery efficiencies remain practically constant. Acid consumptions correspond to 11 (kg HCl/ton mining tail) and 29 (kg HNO_(3)/ton mining tail). The highest amount recovery ratios of these elements correspond to 0.355 and 0.224 (kg REE/ton mining tail), for hydrochloric and nitric solutions, respectively. These results influence the types of reagents and parameters to be studied in the following stages of the global process.
机译：稀土元素（REE）包括15粒镧系元素，钪和钇，在技术和核领域拥有各种应用。在智利Atacama地区铜矿物浸出过程中产生的REE在巨大的实体采矿废物中产生的可能性产生了对这种类型的废物处理的增加的可能性，并支持循环经济的发展，产生有用的 - 在不同行业的产品。为了了解存在于固体载体废物中存在的这些元素的行为，通过分别使用两个试剂进行浸出过程，对应于盐酸和硝酸。展示了从载体尾部恢复REE的技术可行性，这些元素的最佳浸出剂是盐酸溶液，获得64.5％的最大恢复效率，用于酸浓度：3m，温度：40＆＃176; C和（液体/固体）比例：4。镧和铈与其他REE相比，盐酸溶液的最高效率分别为75.7％和70.0％的最佳效率。最大影响REE回收的操作参数的相互作用对应于温度和（液体/固体）比率。浸出4小时后，REE恢复效率仍然是恒定的。酸消耗对应于11（kg HCl /吨矿尾）和29（kg hno_（3）/吨采矿尾巴）。这些元素的最高量回收率分别对应于0.355和0.224（KG REE / TIN开采尾部），用于盐酸和硝酸溶液。这些结果影响了在全局过程的以下阶段进行研究的试剂和参数的类型。

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