Regular Article

Effects of cooling methods on the occurrence of sulfur in the low-titanium slag

¹ School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 100083 Beijing, PR China
² National Engineering and Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, 100081 Beijing, PR China
³ HBIS Company Limited Chengde Branch, 067102 Chengde, PR China
⁴ Hesteel Group Central Iron and Steel Research Institute, 050023 Shijiazhuang, PR China

^* e-mail: zhangmingbo45@163.com

Received: 5 July 2017
Accepted: 19 September 2017

Abstract

The distribution of sulfur existence in the mineral phase and occurrence in the low-titanium slag with different cooling methods (water cooling, air cooling, crucible cooling, and furnace cooling) were studied by XRD, EPMA and XPS. The results show that with the cooling rate decrease, the distribution of S changes from clustering dots to large sheet or surface, and the occurrence of S in the mineral phase transfers gradually from the vitreous, perovskite, merwinite and the intertwined phase of some mineral phases to the gehlenite. During the transfer, the velocity decreases with the increasing of the cooling rate. The S in the water cooling slag only exists in the form of SO₃²⁻ and SO₄²⁻, while the occurrences of S in the air cooling slag, crucible cooling slag, and furnace cooling slag are S²⁻, SO₃²⁻ and SO₄²⁻.