Atmospheric leaching of rare earth elements from bauxite residue-process modelling and feasibility study

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This proposal describes the development plan for exploring atmospheric leaching of rare earth elements (REEs) from bauxite residue. REEs, fifteen lanthanides plus yttrium and scandium, have unique magnetic, spectroscopic and catalytic properties, so they are the main building block of many green and technologically advanced products relied upon by the modern society. The demand for REEs is increasing sharply, and some are identified as strategic materials. The accessible primary sources for these elements are limited and concentrated in China; hence many countries, including Canada, have initiated activities to satisfy their demand for these elements. The current proposal is focused on the recovery of these elements from bauxite residue, produced by Rio Tinto. The aim of the research is to maximize the leaching efficiency of REEs from the residue, recycle the leaching agent by removing impurities, and develop a chemical model to simulate the process. The one-year deliverables include: 1) an innovative atmospheric leaching process using microwave assistance; 2) a novel recycling process for the consumed leaching agent; 3) a process model in AspenPlus to simulate the process; and 4) techno-economic analysis outcomes. The proposed research is highly beneficial for Canadians, as it will improve Canada's technical edge in processing of REEs. Furthermore, it has environmental benefits; because it helps process an otherwise waste stream and convert that to a valuable product, while potentially reduce its adverse environmental impact. It will also help Canadian producers satisfy their demand for these materials. In additions, top personnel will be trained in this research for careers in the Canadian Minerals sector or academia.