Gasification and Migration of Phosphorus from High-phosphorus Iron Ore during Carbothermal Reduction

Zhang, Yuanyuan; Xue, Qingguo; Wang, Guang; Wang, Jingsong

doi:10.2355/isijinternational.isijint-2018-372

Cited by 11 publications

(6 citation statements)

References 26 publications

(26 reference statements)

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“…Wang et al reported the calcium-ferrite with low SiO 2 and High MgO contents. 6) It has a possibility that MgO in SFCA has different function from CaO.…”

Section: Microstructure and Mineral Phases In Sintermentioning

confidence: 99%

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Effect of Hydrogen Concentration in Reducing Gas on the Changes in Mineral Phases during Reduction of Iron Ore Sinter

et al. 2020

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“…Wang et al reported the calcium-ferrite with low SiO 2 and High MgO contents. 6) It has a possibility that MgO in SFCA has different function from CaO.…”

Section: Microstructure and Mineral Phases In Sintermentioning

confidence: 99%

“…The researches on the properties of the composites are reported by many research groups. [4][5][6] However, the decrease amount of carbon dioxide emission is less than 10%.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen Concentration in Reducing Gas on the Changes in Mineral Phases during Reduction of Iron Ore Sinter

et al. 2020

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“…The Fe t O, in the steelmaking slag is furthermore, a potential source for ferrous feedstock if it could be seperated. Various techniques such as flotation, 4) magnetic separation, 5) super gravity separation, [6][7][8] carbothermal reduction, 9) and selective leaching [10][11][12] have been employed to extract phosphorus from steelmaking slags. However, none of these approaches have achieved simultaneous recovery of both iron and phosphorus.…”

Section: Introductionmentioning

confidence: 99%

A Novel Process for Separation of Magnetite and Phosphorous Phases from a CaO–SiO2–FeO–P2O5 Slag

Liang

Long

et al. 2022

ISIJ Int.

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Iron and phosphorus were successfully separated from CaO-SiO 2 -FeO-P 2 O 5 slag through atmospheric control, B 2 O 3 addition and a combination of magnetic separation and flotation. For the slag with basicity (CaO/SiO 2 ) of 2.5 and B 2 O 3 addition of 6% (weight percentage), iron and phosphorus in the slag were enriched in the form of magnetite (Fe 3 O 4 ) and calcium phosphate (Ca 10 P 6 O 25 ) phases respectively under Ar atmosphere. Using a combination of magnetic separation and flotation, the concentrates were obtained with Fe 3 O 4 and P 2 O 5 content of 92.84% and 37.66% respectively, corresponding to the recovery ratios of 85.8% for iron and 91.3% for phosphorus.

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“…As a potential resource, there are abundant reserves of medium-high phosphorus iron ore in the world, and effective exploitation and utilization of these phosphate ores is an important guarantee for the sustainable development of the iron and steel industry. [1][2][3] However, the main forms of phosphorus in phosphorous ore are monazite and apatite, which are closely surrounded by gangue. The ore has high inclusion, small particle size and complex chemical composition, which makes it very difficult to concentrate.…”

Section: Introductionmentioning

confidence: 99%

Gasification Behavior of Phosphorus during Pre-reduction Sintering of Medium-high Phosphorus Iron Ore

Chen

Zuo

2021

ISIJ Int.

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The effects of dephosphorization agents (SiO 2 , Na 2 CO 3 and Al 2 O 3 ) and reduction time on phosphorus gasification during pre-reduction sintering gasification dephosphorization were studied. The results indicate that the dephosphorization rate of apatite by carbothermal reduction is 23%, the dephosphorization rate of adding SiO 2 and Al 2 O 3 is 25%, and the optimal dephosphorization rate is 36% by adding SiO 2 and Na 2 CO 3 . The dephosphorization rate increased from 13% to 31% with the reduction time increased from 20 min to 60 min. Thermodynamic analysis shows that the promotion effect of Na 2 CO 3 on apatite reduction is stronger than that of Al 2 O 3 , and the thermodynamic conditions of apatite reduction are optimized to the greatest extent by adding SiO 2 and Na 2 CO 3 , with the starting temperature of carbothermal reduction of apatite decreased from 1 464°C to 746°C. P and C have the same variation and change trend, and the migration of phosphorus ito metallic iron is related to the carburizing reaction. The good heat storage of the sinter layer in pre-reduction sintering increases the time for maintaining the apatite reaction temperature and promotes the occurrence of dephosphorization reaction, however part of the phosphorus gas is absorbed by liquid metallic iron to form stable iron phosphorus compounds,which leads to the decrease of dephosphorization rate. Besides addition of dephosphorization agent, restricting migration of phosphorus into iron phase is the key point to increase gasification dephosphorization efficiency in sintering process.

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Gasification and Migration of Phosphorus from High-phosphorus Iron Ore during Carbothermal Reduction

Cited by 11 publications

References 26 publications

Effect of Hydrogen Concentration in Reducing Gas on the Changes in Mineral Phases during Reduction of Iron Ore Sinter

Effect of Hydrogen Concentration in Reducing Gas on the Changes in Mineral Phases during Reduction of Iron Ore Sinter

A Novel Process for Separation of Magnetite and Phosphorous Phases from a CaO–SiO<sub>2</sub>–FeO–P<sub>2</sub>O<sub>5</sub> Slag

Gasification Behavior of Phosphorus during Pre-reduction Sintering of Medium-high Phosphorus Iron Ore

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