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| Study on Innovative Process of High phosphorus Oolitic Hematite Ores Processed by Metallized Reduction Roasting and magnetic Separation and Melting Separation |
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Received:March 07, 2018
Revised:March 08, 2018
Accepted:March 08, 2018
Published Online:September 30, 2018
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| DOI： |
| KeyWord:high phosphorus oolitic hematite ores; metallized reduction roasting; magnetic separation; phosphorus removal; melting separation. |
| Author | Institution |
| Jie Xiao-wu |
Research and Design Institute of Metallurgy,BGRIMM Technology Group;Metallurgical and Ecological Engineering College,University of Science and Technology Beijing |
| Wang Cheng-yan |
Metallurgical and Ecological Engineering College,University of Science and Technology Beijing |
| Zhang Yong-lu |
Research and Design Institute of Metallurgy,BGRIMM Technology Group |
| Ruan Shu-feng |
Research and Design Institute of Metallurgy,BGRIMM Technology Group |
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| Abstract: |
| Focusing on the intractable issue of the separation of the valuable element (iron) and impurity elements(phosphorus, silicon and aluminum from the high phosphorus oolitic hematite ores, this paper develops a new technology including selectively metallized reduction in low temperature and magnetic separation followed by melting seperation,adding composite promoters to improve reduction and promote metallic iron particles migration,accumulation and growing.Through the examinations of the roasting temperature , the roasting time,the dosage of promoters and reducing agent ( coal) for the impurities removal,the grade of Fe and Fe recovery in the magnetic-seperation concentrate,the results indixcate that annexing agent has significant effects on iron enrichment and impurities removal. In the optimum process parameters of the raw ore reduction roasting 150 min at 975℃ with 6% promoters and 25% coal,iron which is bar strip and vermicular,mainly existed in the elemental form, phosphorus still existed as apatite. Calcine was processed by grinding and magnetic seperation, it could get a kind of spong iron concentrate with 86.77% Fe, 0.20%P, 1.81% Al2O3 and 3.86% SiO2,the Fe recovery is more than 88%.Next,spong iron concentrate repassed melting seperation at 1550℃,quality molten iron with P<0.01%, Fe>99% could directly be prduced.The whole process of iron recovery rate is more then 85%, The phosphorus, aluminun and silicon impurity removal rate of more then 99%.This new technology can efficiently recovery iron and effectively achieve the seperation of iron and phosphorus, silicon, aluminum. |
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