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A novel method to separate As from high As-Sb dust using Fe2O3 as a fixative under an O2-N2 atmosphere is proposed. Here, Sb is oxidised and converted to Sb2O4 and FeSbO4 that remain in the roasted residue, and As is volatilized in the form of As4O6. The Sb2O3 can be selectively oxidised from the dust by using 21 vol% O2, but the formation of amorphous substance (As-Sb-O) hinders the effective separation...
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