Simulation to Recover Niobium and Tantalum from the Tin Slags of the Old Penouta Mine: A Case Study

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Abstract

Demand for niobium and tantalum is increasing exponentially as these are essential ingredients for the manufacture of, among others, capacitors in technological devices and ferroniobium. Mine tailings rich in such elements could constitute an important source of Nb and Ta in the future and alleviate potential supply risks. This paper evaluates the possibility of recovering niobium and tantalum from the slags generated during the tin beneficiation process of mine tailings from the old Penouta mine, located in Spain. To do so, a simulation of the processes required to beneficiate and refine both elements is carried out. After carbothermic tin reduction, the slags are sent to a hydrometallurgical process where niobium oxide and tantalum oxide are obtained at the end. Reagents, water, and energy consumption, in addition to emissions, effluents, and product yields, are assessed. Certain factors were identified as critical, and recirculation was encouraged in the model to maximise production and minimise reagents’ use and wastes. With this simulation, considering 3000 production hours per year, the metal output from the tailings of the old mine could cover around 1% and 7.4% of the world annual Nb and Ta demand, respectively.

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A critical review on solvent extraction of rare earths from aqueous solutions

Feng Xie, David Dreisinger, Fiona M. Doyle … (2014)

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Mapping the frontiers and front lines of global environmental justice: the EJAtlas

Leah Temper, Daniela Del Bene, Joan Martinez-Alier (2015)

This article highlights the need for collaborative research on ecological conflicts within a global perspective. As the social metabolism of our industrial economy increases, intensifying extractive activities and the production of waste, the related social and environmental impacts generate conflicts and resistance across the world. This expansion of global capitalism leads to greater disconnection between the diverse geographies of injustice along commodity chains. Yet, at the same time, through the globalization of governance processes and Environmental Justice (EJ) movements, local political ecologies are becoming increasingly transnational and interconnected. We first make the case for the need for new approaches to understanding such interlinked conflicts through collaborative and engaged research between academia and civil society. We then present a large-scale research project aimed at understanding the determinants of resource extraction and waste disposal conflicts globally through a collaborative mapping initiative: The EJAtlas, the Global Atlas of Environmental Justice. This article introduces the EJAtlas mapping process and its methodology, describes the process of co-design and development of the atlas, and assesses the initial outcomes and contribution of the tool for activism, advocacy and scientific knowledge. We explain how the atlas can enrich EJ studies by going beyond the isolated case study approach to offer a wider systematic evidence-based enquiry into the politics, power relations and socio-metabolic processes surrounding environmental justice struggles locally and globally.Key words: environmental justice, maps, ecological distribution conflicts, activist knowledge, political ecology