1 College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
Properties of ten-year-aged argon oxygen decarburization stainless steel slag
1 College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
摘要 The characteristics of argon oxygen decarburization slag (AODS) for smelting stainless steel that has been aged for10 years were analyzed. Three types of AODSs distributed at three positions in a slag heap were sampled for comparison experiments. Chemical analysis, mineral phase identification, thermo gravimetric analysis, and micromorphology analysis were used to study the element migration trends and carbonation behavior of AODS after long-term aging. Sequentialleaching tests were performed to study the chromium leachability of the aged AODS. The results show that during the longterm aging process, the AODS heap had undergone oxidation and carbonation, accompanied by element migration andmineralogical evolution. The surface slag had the highest degree of carbonation but the weakest chromium leachability.The chemical composition of the middle slag was the closest to that of the original slag. In the bottom steel slag, in additionto magnesium, certain depositions of other elements were present. The matrix phases in the aged slag were dicalciumsilicate and merwinite, and the chromium was mainly wrapped in these matrix phases in the form of oxides, spinels, oralloys. Under the combined effects of carbonation and oxidation, the leaching characteristics of the chromium in the aged slag varied greatly depending on the location. The bottom slag had the strongest chromium leachability, and the hexavalentchromium had long-term continuous leachability.
Abstract:The characteristics of argon oxygen decarburization slag (AODS) for smelting stainless steel that has been aged for10 years were analyzed. Three types of AODSs distributed at three positions in a slag heap were sampled for comparison experiments. Chemical analysis, mineral phase identification, thermo gravimetric analysis, and micromorphology analysis were used to study the element migration trends and carbonation behavior of AODS after long-term aging. Sequentialleaching tests were performed to study the chromium leachability of the aged AODS. The results show that during the longterm aging process, the AODS heap had undergone oxidation and carbonation, accompanied by element migration andmineralogical evolution. The surface slag had the highest degree of carbonation but the weakest chromium leachability.The chemical composition of the middle slag was the closest to that of the original slag. In the bottom steel slag, in additionto magnesium, certain depositions of other elements were present. The matrix phases in the aged slag were dicalciumsilicate and merwinite, and the chromium was mainly wrapped in these matrix phases in the form of oxides, spinels, oralloys. Under the combined effects of carbonation and oxidation, the leaching characteristics of the chromium in the aged slag varied greatly depending on the location. The bottom slag had the strongest chromium leachability, and the hexavalentchromium had long-term continuous leachability.
Ya-jun Wang,Ya-nan Zeng,Jun-guo Li, et al. Properties of ten-year-aged argon oxygen decarburization stainless steel slag[J]. Journal of Iron and Steel Research International, 2021, 28(10): 1233-1242.