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The reduction roasting followed by magnetic separation process is considered to be a suitable method to treat the high-phosphorus oolitic iron ore. Currently, the dephosphorization mechanism of additives such as CaCO 3 , Ca(OH) 2 , Na 2 SO 4 , and Na 2 CO 3  on the reduction roasting of the iron ore in which phosphorus occurs in apatite have been thoroughly studied. The effect of sodium salts (Na 2 CO 3 , NaCl and Na 2 SO 4 ) on reduction roasting and magnetic separation of high-phosphorus oolitic iron ore containing phosphorus in iron oxides was investigated, and the mechanisms of sodium salts were expounded using XRD and SEM-EDS. The results show that the dephosphorization ability of sodium salts was in the order of Na 2 SO 4 &gt; Na 2 CO 3 &gt; NaCl&gt;no sodium salts. Na 2 CO 3  and Na 2 SO 4  transferred Fe 3 PO 7  from the iron oxides to nepheline, which upgraded the separation of iron and phosphorus. However, NaCl did not inhibit the reduction of phosphorus in the iron minerals. In addition, Na 2 CO 3  strengthened the reduction of iron oxides. However, a small amount of wustite failed to be reduced to metallic iron with the addition of NaCl, and troilite and wustite formed hindered the reduction of iron minerals after adding Na 2 SO 4 .

Influence of Sodium Salts on Reduction Roasting of High-Phosphorus Oolitic Iron Ore