Journal of Northeastern University Natural Science ›› 2014, Vol. 35 ›› Issue (7): 1028-1032.DOI: 10.12068/j.issn.1005-3026.2014.07.026

• Resources & Civil Engineering • Previous Articles     Next Articles

Dephosphorization Effect of Sodium Carbonate in the Process of Direct Reduction Roasting of High Phosphorous Oolitic Hematite

XU Yan, SUN Tichang, LIU Zhiguo, XU Chengyan   

  1. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
  • Received:2013-08-20 Revised:2013-08-20 Online:2014-07-15 Published:2014-04-11
  • Contact: XU Yan
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Abstract: In order to investigate the effects of sodium carbonate on magnetic concentration and dephosphorization in direct reduction roasting process of a high phosphorous oolitic hematite from Nigeria, the products of direct reduction roasting were analyzed by Xray diffraction(XRD) and scanning electron microscopy(SEM) after sodium carbonate was added. The results showed that the dephosphorization can be realized in the reduction roasting process after the sodium carbonate was added:sodium carbonate added inhibits the formation of fayalite and interdicts the process of the phosphorus entering metallic iron; the oolitic structure is destroyed, promoting aggregation and growth of metallic iron particles and the liberation of metallic iron particles from gangue; phosphorusbearing minerals in the raw ore can react with sodium carbonate in the process of roasting, so that soluble complex sodium phosphate is generated, which is soluble in water in the process of grinding and magnetic separation and lower phosphorus content of direct reduction iron.

Key words: high phosphorous oolitic hematite, crandallite, sodium carbonate, direct reduction roasting, dephosphorization

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