Desulfurization ability of refining slag with medium basicity
来源期刊：International Journal of Minerals Metallurgy and Materials2014年第12期
论文作者：Hui-xiang Yu Xin-hua Wang Mao Wang Wan-jun Wang
文章页码：1160 - 1166
摘 要：The desulfurization ability of refining slag with relative lower basicity（B） and Al2O3 content（B = 3.5-5.0; 20wt%-25wt% Al2O3） was studied. Firstly, the component activities and sulfide capacity（CS） of the slag were calculated. Then slag-metal equilibrium experiments were carried out to measure the equilibrium sulfur distribution（LS）. Based on the laboratorial experiments, slag composition was optimized for a better desulfurization ability, which was verified by industrial trials in a steel plant. The obtained results indicated that an Mg O-saturated Ca O-Al2O3-Si O2-Mg O system with the basicity of about 3.5-5.0 and the Al2O3 content in the range of 20wt%-25wt% has high activity of Ca O（aCa O）, with no deterioration of CS compared with conventional desulfurization slag. The measured LS between high-strength low-alloyed（HSLA） steel and slag with a basicity of about 3.5 and an Al2O3 content of about 20wt% and between HSLA steel and slag with a basicity of about 5.0 and an Al2O3 content of about 25wt% is 350 and 275, respectively. The new slag with a basicity of about 3.5-5.0 and an Al2O3 content of about 20wt% has strong desulfurization ability. In particular, the key for high-efficiency desulfurization is to keep oxygen potential in the reaction system as low as possible, which was also verified by industrial trials.
Hui-xiang Yu1,2，Xin-hua Wang2，Mao Wang2，Wan-jun Wang2
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
摘 要：The desulfurization ability of refining slag with relative lower basicity（B） and Al2O3 content（B = 3.5-5.0; 20wt%-25wt% Al2O3） was studied. Firstly, the component activities and sulfide capacity（CS） of the slag were calculated. Then slag-metal equilibrium experiments were carried out to measure the equilibrium sulfur distribution（LS）. Based on the laboratorial experiments, slag composition was optimized for a better desulfurization ability, which was verified by industrial trials in a steel plant. The obtained results indicated that an Mg O-saturated Ca O-Al2O3-Si O2-Mg O system with the basicity of about 3.5-5.0 and the Al2O3 content in the range of 20wt%-25wt% has high activity of Ca O（aCa O）, with no deterioration of CS compared with conventional desulfurization slag. The measured LS between high-strength low-alloyed（HSLA） steel and slag with a basicity of about 3.5 and an Al2O3 content of about 20wt% and between HSLA steel and slag with a basicity of about 5.0 and an Al2O3 content of about 25wt% is 350 and 275, respectively. The new slag with a basicity of about 3.5-5.0 and an Al2O3 content of about 20wt% has strong desulfurization ability. In particular, the key for high-efficiency desulfurization is to keep oxygen potential in the reaction system as low as possible, which was also verified by industrial trials.
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