KR脱硫渣高温矿物组成及含硫相的析出行为

doi:10.13228/j.boyuan.issn0449-749x.20210185

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Abstract KR desulfurization slag is a by-product of the desulfurization pretreatment process about hot metal, in which the mass percent of CaO in the tailings after magnetic separation is more than 50%. It can be used as a slag-making material by recharging to converter steelmaking process to reduce the economic cost of converter steelmaking. However, the sulfur in the KR desulfurization slag (w((S))=1.0%-2.5%) has become an obstacle to the recycling of converter smelting, and its direct use in converter smelting will increase the sulfur content in the steel. Therefore, according to the chemical composition of industrial KR desulfurization slag, the mineral composition and precipitation behavior of sulfur-containing phase in KR desulfurization slag were investigated in the form of synthetic slag. The purpose is to clarify the mineral phase composition of KR desulfurization slag, the precipitation behavior and occurrence state of sulfur in slag, so as to provide theoretical reference for the subsequent effective removal of sulfur in KR desulfurization slag through oxidizing atmosphere. FactSage 8.0 was adopted to simulate the solidification process of CaO-SiO₂-CaS-CaF₂-based slag, and XRD and SEM-EDS were employed to analyze the mineral composition and microscopic morphology respectively. The thermodynamic calculation results show that the crystallization temperature of CaS is 1 320 ℃, which is lower than that of MeO#1 phase, MeO#2 phase and 2CaO·SiO₂phase. The results of surface scanning analysis of slag samples show that a small amount of sulfur in slag did not precipitate to form CaS crystal due to the increase of residual liquid viscosity during the actual solidification, and it exists in the matrix phase in the form of amorphous state. KR desulfurization slag mainly composes of C₃S, MeO#1 (based on CaO), MeO#2 (based on MgO), matrix and CaS. The sulfur element mainly precipitates along the boundary of the silicate (C₃S) phases.

Key words： KR desulfurization slag CaS occurrence matrix solidification mineral composition

Received: 06 April 2021

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	ZHU Ren-lin
	LI Jian-li
	SHEN Jia-hao
	YU Yue
	ZHU Hang-yu

Cite this article:

ZHU Ren-lin,LI Jian-li,SHEN Jia-hao等. Mineral composition of KR desulfurization slag and precipitation behavior of sulfur-containing phases[J]. Iron and Steel, 2021, 56(11): 72-77.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210185 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I11/72

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