硫含量对KR脱硫渣中硫赋存状态的影响

doi:10.13228/j.boyuan.issn0449-749x.20210405

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Abstract The CaO component in KR desulfurization slag is an important slagging raw material in converter smelting process. Its reuse in converter smelting can reduce the CaO raw material consumption as well as the accumulation of KR desulfurization slag for metallurgical enterprise, and save the economic cost of smelting. Moreover, 2CaO·SiO₂ (C2S) in the KR desulfurization slag can form stable C2S-C3P(2CaO·SiO₂-3CaO·P₂O₅) solid solution with phosphorus in the slag to improve the stability of phosphorus during converter dephosphorization smelting. Reusing KR desulfurization slag instead of activated lime as converter slag can promote early slagging in the initial stage of converter smelting and improve the dephosphorization efficiency. However, w((S)) in the KR desulfurization slag was 1.0%-2.5%, reusing it directly in converter smelting would lead to sulfur increase in molten steel. Therefore, in order to clarify the influence of sulfur content on occurrence state of sulfur in molten slag, and to provide a theoretical basis for subsequent effective removal of sulfur from KR desulfurization slag through oxidizing atmosphere,the solidification process of each phase in the molten slag was simulated by FactSage8.0, the basic phase and micro morphology of molten slag were analyzed and detected by SEM-EDS and XRD, and the average grain area of CaS in the slag sample was analyzed by Image-Proplus 6.0. Thermodynamic calculation showed that the crystallization temperature of CaS in molten slag increased from 1 240 to 1 390 ℃ when w((S)) was 0.5%-2.5% in the molten slag. In addition, the content of MeO#1 phase and the viscosity of slag gradually decreased in molten slag with the increase of sulfur content at 1 600 ℃. When w((S)) was 0.5%, the sulfur in the molten slag existed in amorphous structure, while w((S)) was 1.0%-2.0%, the sulfur mainly existed in the form of CaS. When w((S)) was 2.0%-2.5%, the sulfur existed in CaS phase and Ca₁₁ (SiO₄) ₄O₂S phase, and Ca₁₁ (SiO₄) ₄O₂S mainly existed in silicate phase. With the increase of sulfur content, the growth rate and average grain area of CaS in molten slag gradually increased, and the CaS grains gradually evolved from irregular structure to round structure.

Key words： KR desulfurization slag sulfur content occurrence state precipitation behavior microstructure solidification

Received: 16 July 2021

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	ZHU Ren-lin
	LI Jian-li
	YU Yue
	ZHU Hang-yu

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ZHU Ren-lin,LI Jian-li,YU Yue等. Effect of sulfur content on occurrence state of sulfur in KR desulfurization slag[J]. Iron and Steel, 2022, 57(2): 54-62.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210405 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I2/54

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