Phosphorus Removal of High Phosphorus Iron Ore by Gas-Based Reduction and Melt Separation

Tang, Huajie; Guo, Zhancheng; Zhao, Zhengzhi

doi:10.1016/s1006-706x(10)60133-1

Cited by 61 publications

(35 citation statements)

References 2 publications

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“…When reduction time reached 5 h, M Fe and M R rose up to 63.2 wt% and 87.1%, respectively. In contrast, Tang et al 13) has reported that after 5 h reduction by high purity of H 2 gas at 1 073 K in the vertical static tube furnace, the iron metallization ratio of 80 g oolitic hematic powder was still less than 70%. The obvious difference in M R attributed to the two different kinetic factors from this work.…”

Section: Evaluation Indices and Analytical Methodsmentioning

confidence: 90%

“…The reduction process, one of the typical processes for the treatment of oolitic hematite ore, including direct 10,11) and indirect reduction, 12,13) has received considerable attention in recent years. The route of direct reduction, mostly used carbon as the reductant and followed by the magnetic separation, was recommended to be a feasible way for the iron recovery and simultaneous dephosphorization from oolitic…”

Section: Introductionmentioning

confidence: 99%

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Slag/Metal Separation from H<sub>2</sub>-Reduced High Phosphorus Oolitic Hematite

Zhao

Wang

et al. 2017

ISIJ International

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Section: Evaluation Indices and Analytical Methodsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Slag/Metal Separation from H<sub>2</sub>-Reduced High Phosphorus Oolitic Hematite

Zhao

Wang

et al. 2017

ISIJ International

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“…Due to the depletion of high quality iron ores with the rapid development of the iron and steel industry, the utilization of refractory iron ores has recently attracted increased attention [1][2][3]. Oolitic hematite ore, a standard type of refractory iron ore, is mainly distributed in America, France, Russia, Pakistan, China, and other countries [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Reaction Behavior of Phosphorus in Coal-Based Reduction of an Oolitic Hematite Ore and Pre-Dephosphorization of Reduced Iron

Gao

Han

et al. 2016

Metals

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Coal-based reduction followed by magnetic separation is an effective way to recover iron from high phosphorus-containing oolitic hematite ore. Given that high quantities of dephosphorization agent are needed to obtain low phosphorus reduced iron, a novel approach is proposed by the authors. Without prior phosphorus removal, the phosphorus was enriched in the reduced iron during a reduction process, then high-phosphorus reduced iron was refined to low phosphorus molten iron and high phosphorus dephosphorization slag to be used as a phosphate fertilizer. The influences of various parameters, including the reduction temperature, the reduction time, and the C/O molar ratio, on the reaction behavior of phosphorus during reduction process were studied. Experimental results indicate that a higher reduction temperature, a longer reduction time, or a higher C/O molar ratio was favorable for the reduction of apatite to phosphorus and the enrichment of phosphorus in reduced iron. X-ray diffraction (XRD) analysis demonstrated that the apatite was reduced to phosphorus and Ca 2 SiO 4 (or Ca(Al 2 Si 2 O 8 )) in the presence of SiO 2 and Al 2 O 3 , whilst the phosphorus enriched in reduced iron formed Fe 3 P. The migration behavior of phosphorus was investigated using line scanning analysis of reduction products at different reduction times. The results show that the phosphorus primarily existed in the slag phase 10 min before reduction, and a large amount of phosphorus migrated into iron phase from slag phase with a reduction time of 40 min. The phosphorus content in the iron phase only slightly changed after 50 min. The pre-dephosphorization of reduced iron was performed at 1873 K, indicating a higher basicity or Fe t O content of CaO-based slag was beneficial to dephosphorization of the reduced iron.

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“…However, high grade iron ores are not rich in China, and the import price of the ores has been rising dramatically, which has threatened the national sustainable development of iron and steel industry. To solve the crisis of resources, utilization of the refractory ores is an urgent need, 1,2) such as oolitic iron ore. The oolitic iron ore is a typical complex resource, which mainly distributes in China, USA, Canada, and Egypt.…”

Section: Introductionmentioning

confidence: 99%

Dephosphorization Treatment of High Phosphorus Oolitic Iron Ore by Hydrometallurgical Process and Leaching Kinetics

Guo

Tang

2013

ISIJ Int.

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Dephosphorization process of high phosphorus oolitic iron ore by acid leaching and leaching kinetics were investigated in the paper. The high phosphorus ore samples (51%T.Fe, 0.52%P) used in this work were analysed by SEM-EDS and XRD, which showed their oolitic structure and mineral phases. Among the three kinds of acids (H2SO4, HCl and HNO3), sulfuric acid was the most appropriate one for dephosphorization, and structure changes after leaching were also investigated through the SEM and EDS analysis. The effects of acidity, particle size, stirring speed and temperature were researched in detail. Through acid leaching, phosphorus could be removed effectively, and iron loss was negligible, which was also studied by thermodynamic calculation. The experimental data could be well described by the unreacted shrinking core model and rate controlling step was found to be chemical reaction between apatite and acid. The apparent activation energy was calculated as 45.02 kJ/mol.

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Phosphorus Removal of High Phosphorus Iron Ore by Gas-Based Reduction and Melt Separation

Cited by 61 publications

References 2 publications

Slag/Metal Separation from H<sub>2</sub>-Reduced High Phosphorus Oolitic Hematite

Slag/Metal Separation from H<sub>2</sub>-Reduced High Phosphorus Oolitic Hematite

Reaction Behavior of Phosphorus in Coal-Based Reduction of an Oolitic Hematite Ore and Pre-Dephosphorization of Reduced Iron

Dephosphorization Treatment of High Phosphorus Oolitic Iron Ore by Hydrometallurgical Process and Leaching Kinetics

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