Phosphorus Distribution Behavior of Solid Iron Reduced from Molten Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;–CaO–Fe&lt;sub&gt;t&lt;/sub&gt;O–MgO–SiO&lt;sub&gt;2&lt;/sub&gt; System at 1623 K

Maruoka, Nobuhiro; Narumi, Shintaro; Kitamura, Shin Ya

doi:10.2355/isijinternational.55.419

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…the dephosphorization load in the steelmaking process can be greatly reduced. 1,[4][5][6] Establishment of the separation technique is necessary since the P-concentrated phases and other phases in the reduction product exist in a mixed state.…”

Section: Removal Of Phosphorus From High-phosphorus Iron Ore With Prementioning

confidence: 99%

Removal of Phosphorus from High-phosphorus Iron Ore with Preliminary Reduction Treatment and Physical Concentration

2019

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Fundamental experiments were conducted with the aim of crude separation of the phosphorus contained in high-P iron ore prior to the ironmaking process. By reducing high-P iron ore with lime and graphite at an appropriate blending ratio and temperature, a reduction product was obtained consisting of a P-concentrated phase, metallic Fe with low P, and an Fe oxide-containing phase. The reduction product was pulverized by electrical pulse disintegration, and a magnetic separation experiment was performed for each particle group. As a result, 57.5% of the P contained in the reduction product was removed by removing particles of 250 μm or less. Samples simulating the constituent phases of the reduction products were synthesized and subjected to magnetization measurement. It was assumed that the Fe oxide-containing phase was paramagnetic and the P-concentrated phase was diamagnetic. We calculated the magnetic and drag forces acting on the paramagnetic particles in wet magnetic separation. When the magnetic field gradient was low, the magnetic forces acting on the fine particles were low, and attraction was difficult due to the drag force of water.

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Section: Removal Of Phosphorus From High-phosphorus Iron Ore With Prementioning

confidence: 99%

Removal of Phosphorus from High-phosphorus Iron Ore with Preliminary Reduction Treatment and Physical Concentration

2019

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“…[1][2][3][4][5][6] To solve this problem, medium-and high-phosphorus-bearing iron ores have increasingly been employed as raw materials for blast furnaces due to abundant reserves, but this approach has resulted in a high phosphorus content in hot metal, aggravating the dephosphorization burden in the steel making process. [7][8][9][10][11][12] Therefore, it is absolutely imperative to remove phosphorus in the preparation of raw materials, at least before addition to a blast furnace.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Carbon Mixing Ratio on Mineral Evolution and Gasification Dephosphorization during the Pre-reduction Sintering Process of Bayan Obo Iron Ore Concentrate

et al. 2023

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The pre-reduction sintering process is an effective measure to fundamentally solve the detrimental circulating accumulation of phosphorus in iron-and steel-making procedures. The effect of the carbon mixing ratio on the mineral evolution, gasification dephosphorization and pre-reduction degree of sintering products was primarily investigated based on the phosphorus occurrence status in Bayan Obo iron ore concentrate. The obtained results indicated that iron oxide was dominantly transformed from magnetite into wüstite, and metallic iron was basically not detected. Regarding silicate slag, the precipitated dendritic phase accounted for a higher content of FeO and MgO and a lower content of Na 2 O + K 2 O and SiO 2 over the vitreous matrix phase. Moreover, as the carbon mixing ratio was increased from 5 to 25 wt%, the gasification dephosphorization and pre-reduction degree first increased from 11.3% and 30.7%, respectively, to 70.0% and 67.4%, respectively, due to the enhanced reducing atmosphere and then decreased to 45.0% and 59.0%, respectively, led by the increased content of liquid slag and the reduced permeability of the burden layer. Both maximum values were obtained at a 20 wt% carbon mixing ratio. Furthermore, the pre-reduction sintering products as raw materials for blast furnaces could not only largely reduce the phosphorus content in hot metal but could also dramatically decrease coke usage and carbon dioxide emissions, which could be highly beneficial to realize carbon peaking and carbon neutrality.

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“…The authors have previously proposed a process for the removal of P from the iron ore before blast furnace reduction, carried out at a temperature lower than that of the current steelmaking process. [3][4][5] Figure 1 shows the result of a calculation performed using the thermodynamics software Factsage 6.4. It shows the dependence of the reduction equilibrium composition on oxygen partial pressure and the temperature of the blast furnace, which contains the raw material.…”

Section: Introductionmentioning

confidence: 99%

Enrichment of Phosphorus from Iron Ore to Dicalcium-silicate Phase by Partial Reduction

Maruoka

Kubo

2021

ISIJ Int.

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Due to the low quality of available iron ore, it is necessary to develop a new technology to produce high quality steel from ore containing a high concentration of phosphorous. In this study, we propose a new process for producing low-P steel by concentrating P in the dicalcium silicate phase through a partial reduction process. High-P iron ore was mixed with varying quantities of CaO and graphite and heated at 1 573 K in an Ar atmosphere, and the obtained product was analyzed by electron probe microanalysis. It was found that in the reduced product mixture that was obtained under specific conditions of high basicity and a lower amount of added carbon, more than 95% of P was concentrated in the dicalcium silicate phase, and the P content in metallic iron was sufficiently low.

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Phosphorus Distribution Behavior of Solid Iron Reduced from Molten Al<sub>2</sub>O<sub>3</sub>–CaO–Fe<sub>t</sub>O–MgO–SiO<sub>2</sub> System at 1623 K

Cited by 8 publications

References 22 publications

Removal of Phosphorus from High-phosphorus Iron Ore with Preliminary Reduction Treatment and Physical Concentration

Removal of Phosphorus from High-phosphorus Iron Ore with Preliminary Reduction Treatment and Physical Concentration

Effect of the Carbon Mixing Ratio on Mineral Evolution and Gasification Dephosphorization during the Pre-reduction Sintering Process of Bayan Obo Iron Ore Concentrate

Enrichment of Phosphorus from Iron Ore to Dicalcium-silicate Phase by Partial Reduction

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