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Recovery of niobium and tantalum by solvent extraction from Sn–Ta–Nb mining tailings

机译：SN-TA-NB采矿尾矿溶剂萃取铌和钽瘤

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The slag from the extraction processes of metals from their ores may contain valuable components that, if adequately recovered, can be reintroduced in the technological life cycle. This is the case for the material obtained in Penouta mines in the North of Spain. These mineral sites are a main source of tin obtained from cassiterite. The mineral is submitted to a pyrometallurgical process to separate tin, however cassiterite is not the only mineral present in the veins, and large amounts of other minerals are normally discarded, constituting the slag. In the present case, besides cassiterite, one of the most abundant minerals in the ore is columbo tantalite, the source of the strategic coltan. In this work the raw material (slag) has been treated by acid leaching, using HF/H _(2) SO _(4) as the leaching agent. Then liquid–liquid extraction of Nb and Ta was performed, with Cyanex?923 extractant, so that both metals were obtained separately. Then they were precipitated from the corresponding aqeuous solution, and calcined in order to yield Nb _(2) O _(5) of 98.5% purity and tantalum salt, after calcination and purification, of 97.3% purity. The process described in this work opens a possibility to produce high quality materials that are considered critical by the EU from alternative sources exempt of criticality factors.
机译：来自其矿石的金属的提取过程的炉渣可能包含有价值的组分，如果充分回收，可以在技术生命周期中重新引入。这是在西班牙北部的Penouta地雷中获得的材料的情况。这些矿物位点是从咔铝获得的锡的主要来源。将矿物质提交给Pyrome冶金过程以分离锡，但是咔缕是静脉中唯一存在的矿物质，并且通常丢弃大量的其他矿物质，构成炉渣。在目前的情况下，除了羰基石之外，矿石中最丰富的矿物质之一是Columbo Tantalite，战略科尔坦的来源。在这项工作中，使用HF / H _（2）所以_（4）作为浸出剂，通过酸浸出处理原料（炉渣）。然后进行液 - 液萃取Nb和Ta，用Cyanex？923萃取剂，使得两种金属分别获得。然后将它们从相应的溶液中沉淀，并煅烧以产生98.5％纯度和钽盐，煅烧和纯化后的Nb _（2）O _（5），纯度为97.3％。本工作中描述的过程打开了一种可能产生高质量材料，这些材料被欧盟从替代来源豁免关键因素的替代来源。

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