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Fundamental Research on a Rational Steelmaking Slag Recycling System by Phosphorus Separation and Collection

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Published/Copyright: April 18, 2013
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Journal for Manufacturing Science & Production
From the journal Journal for Manufacturing Science & Production Volume 13 Issue 1-2

Abstract

Recently, reduction of the steelmaking slag stock in Japan has been required, but utilization of steelmaking slag is restricted due to its chemical properties. On the other hand, the price of phosphorus ore is increasing rapidly due to the very tight supply/demand balance worldwide. In this work, (FetO) and (P2O5) reduction in steelmaking slag and recovery as a phosphorus source were investigated in feasibility studies and laboratory-scale experiments in order to develop a rational recycling process for steelmaking slag. The results are summarized as follows: (a) Steelmaking slag was reduced by carbon under high temperature conditions (1373–1873 K), and high-P hot metal was recovered. The phosphorus content of the reduced slag was <0.3 mass%. (b) Higher temperatures were required for slag reduction with carbon, corresponding to increasing slag basicity. (c) The oxygen partial pressure calculated from the FeO content ranged from 10−13 to 10−17 atm. More than 50 mass% of phosphorus in the slag can be removed under the condition that FeO activity is less than 0.01. (d) From the mass balance of phosphorus, 0–30 mass% of undefined phosphorus was observed, which was estimated by thermodynamic calculations and SEM-EPMA analysis to be caused by gaseous dephosphorization. (e) The gaseous dephosphorization ratio becomes more than 10% at the condition of log LP ≤  0. (f) Phosphorus was enriched in slag to higher than 30 mass% P2O5 by dephosphorization of high-P (1.05 mass%) hot metal.

Keywords: dephosphorization from slag; steelmaking slag; basicity; thermodynamics
Steelmaking Research Dept., Steel Research Laboratory, JFE Steel Corporation, Fukuyama, Japan
Received: 2012-10-01
Accepted: 2012-12-23
Published Online: 2013-04-18
Published in Print: 2013-04-17

©[2013] by Walter de Gruyter Berlin Boston

Articles in the same Issue

  1. Masthead
  2. Effect of Some Lubricants on the Flow Characteristics of ‘EPDM’ Rubber Under Compressive Load
  3. Friction Stir Welds of AA6351-T6 and AA2024-T6 Dissimiler Aluminium Alloys
  4. Effect of Welding Parameters on Pitting Corrosion Rate in 3.5N NaCl of Pulsed Current Micro Plasma Arc Welded AISI 304L Sheets
  5. An Investigation of Flank Wear Land Inclination in Orthogonal Machining
  6. Modeling of Radial Over Cut in Electrochemical Machining of Al-B4C MMC Using Response Surface Methodology
  7. Fundamental Research on a Rational Steelmaking Slag Recycling System by Phosphorus Separation and Collection
  8. KTH Steel Scrap Model – Iron and Steel Flow in the Swedish Society 1889–2010
  9. Direct Electrochemical Reduction of Titanium-Bearing Compounds to Titanium-Silicon Alloys in Molten Calcium Chloride
  10. In Situ Observation of the Evolution of Intragranular Acicular Ferrite at Mg-containing Inclusions in 16Mn Steel
  11. The Physical Properties of Slags for Electro-slag Remelting in CaF2-CaO-Al2O3-SiO2 System
  12. Freeze-lining Formation and Microstructure in a Direct-to-blister Flash Smelting Slag
  13. The Mechanism of Dross Formation during Hot-dip Al-Zn Alloy Coating Process
  14. Solidification Behaviour of Slags: The Single Hot Thermocouple Technique
  15. Investigation of Continuous Casting Slag Films Sampled on Site and Comparison with Laboratory Results
  16. Thermal Conductivity of R-Na2O-SiO2 (R = Al2O3, CaO) Melts
  17. Investigation of Blowing High Silicon Hot Metal by Double Slag Process
  18. An Investigation of Electro-deoxidation Process for Producing Titanium from Dense Titanium Dioxide Cathode
  19. Interaction between Molten Steel, Alumina Lining Refractory and Slag Phase
https://doi.org/10.1515/jmsp-2012-0038
Keywords for this article
dephosphorization from slag; steelmaking slag; basicity; thermodynamics

Articles in the same Issue

  1. Masthead
  2. Effect of Some Lubricants on the Flow Characteristics of ‘EPDM’ Rubber Under Compressive Load
  3. Friction Stir Welds of AA6351-T6 and AA2024-T6 Dissimiler Aluminium Alloys
  4. Effect of Welding Parameters on Pitting Corrosion Rate in 3.5N NaCl of Pulsed Current Micro Plasma Arc Welded AISI 304L Sheets
  5. An Investigation of Flank Wear Land Inclination in Orthogonal Machining
  6. Modeling of Radial Over Cut in Electrochemical Machining of Al-B4C MMC Using Response Surface Methodology
  7. Fundamental Research on a Rational Steelmaking Slag Recycling System by Phosphorus Separation and Collection
  8. KTH Steel Scrap Model – Iron and Steel Flow in the Swedish Society 1889–2010
  9. Direct Electrochemical Reduction of Titanium-Bearing Compounds to Titanium-Silicon Alloys in Molten Calcium Chloride
  10. In Situ Observation of the Evolution of Intragranular Acicular Ferrite at Mg-containing Inclusions in 16Mn Steel
  11. The Physical Properties of Slags for Electro-slag Remelting in CaF2-CaO-Al2O3-SiO2 System
  12. Freeze-lining Formation and Microstructure in a Direct-to-blister Flash Smelting Slag
  13. The Mechanism of Dross Formation during Hot-dip Al-Zn Alloy Coating Process
  14. Solidification Behaviour of Slags: The Single Hot Thermocouple Technique
  15. Investigation of Continuous Casting Slag Films Sampled on Site and Comparison with Laboratory Results
  16. Thermal Conductivity of R-Na2O-SiO2 (R = Al2O3, CaO) Melts
  17. Investigation of Blowing High Silicon Hot Metal by Double Slag Process
  18. An Investigation of Electro-deoxidation Process for Producing Titanium from Dense Titanium Dioxide Cathode
  19. Interaction between Molten Steel, Alumina Lining Refractory and Slag Phase
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