Rainbow partners with Mosaic to develop REE extraction from phosphogypsum
London-listed Rainbow Rare Earths has signed a memorandum of understanding with the Mosaic Company to jointly conduct a preliminary economic assessment related to the extraction of rare earth elements from Mosaic’s phosphogypsum stack, in Brazil.
Rainbow expects the Uberaba stack to have a similar grade and REE make-up to that of its Phalaborwa project, in South Africa, because both operations involve a hard-rock carbonatite phosphate deposit being mined and processed into a phosphate slurry before being processed into phosphoric acid. While the hard-rock carbonatite does not contain rare earths in sufficient quantities to be mined for these elements alone, the plant processes it undergoes serve to concentrate the quantity of rare earths contained therein, resulting in higher concentrations of rare earths than are in the original hard rock.
The benefit of this is that it can render the rare earths associated with the phosphogypsum amenable to direct acid leaching, which allows for a simpler hydrometallurgical process to produce separated and purified rare earth oxides.
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