A B S T R A C TA process has been proposed for the treatment of apatite concentrate obtained @om tho dephosphorization o j iron ore. In this process, the apatite is acidulated by H N O , to produce high-purity H,PO4. The crude acid obtained is shown to be at least equivalent to, if not better than, the typical wet-process acid. The H3PO4 is purified by extraction and concentrated by evaporation. The spent H N O , is regenerated by H 2 S 0 4 to precipitate gypsum. Rare earths dissolved during the apatite acidu…
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