Fundamental Research on a Rational Steelmaking Slag Recycling System by Phosphorus Separation and Collection
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 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) Phosphorus was enriched in slag to be higher than 30 mass ％ P2O5 by dephosphorization of high-P (1.05 mass ％) hot metal.
dephosphorization from slag steelmaking slag basicity thermodynamics
Kenji Nakase Akitoshi Matsui Naoki Kikuchi Yuji Miki Yasuo Kishimoto Itsuo Goto Tetsuya Nagasaka
Steelmaking Research Dept., Steel Research Laboratory, JFE Steel Corporation, 1 Kokan-cho, Fukuyama Research Planning Dept., Steel Research Laboratory, JFE Steel Corporation, 1 Kawasaki-cho, Chuou-ku, Faculty of Applied Bio-Science, Tokyo University of Agriculture, 1-1-1 Sakuraoka, Setagaya-ku, Tokyo Graduate School of Environmental Studies, Tohoku University, 6-6-11 Aza-Aoba, Aramaki, Aoba-ku, Send
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-7
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）