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The demand for rare earth elements (REEs) in the global economy has incentivised many researchers to search for alternative sources of those metals. For many years fly ashes have been the subject of such research, which indicate that they might be fit for REE recovery. One of the primary problems with recovering those metals from fly ashes faced by process engineers is the form in which they occur. As research shows, REEs occur in fly ashes in the glass and other mineral components (e.g. monazite, xenotime and oth...