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Towards zero-waste valorisation of rare-earth-containing industrial ...

of phosphogypsum produced during phosphoric acid production exceeds the mass of the product, i.e. 4.5e5.5 tonnes .... dioxide and the recovery of a heavy rare-earth concentrate (Preston et al., 1996b), (2) a process for the ..... associated with iron and titanium minerals that remain unchanged. (Derevyankin et al., 1981c).