Abstract: The phosphorus occurrence states of high phosphorous oolitic hematite in Nigeria were studied by soak leaching and electrodialysis test. The characteristics of roasted products in the beneficiation by direct reduction roasting with dephosphorization agent Na2CO3 was also analyzed using the XRD and SEM. It showed that phosphorusbearing minerals mainly existed as crandallite (CaAl3(OH)6(HPO4)(PO4)) and vauxite (FeAl2(PO4)2OH·6H2O)， which embedded in the fissures and holes of oolitic iron ore particles， or existed as the form of isomorphism interfusing in the ore mechanically. Separation of phosphorus and iron can be realized by direct reduction roasting (adding dephosphorizing agent Na2CO3) and magnetic separation. Phosphorus can be removed in two ways: part of the phosphorus was separated with iron and existed in the gangue mineral，which could be removed by grinding and magnetic separation. The other part of the phosphorusbearing minerals was transferred into the soluble phosphorus by reacting with the dephosphorization agent Na2CO3. Then the phosphorus content of the reduced iron products was reduced.

Key words: high phosphorous oolitic hematite, crandallite, vauxite, direct reduction roasting, phosphorus removal