Regular Article

Sulphide capacity of CaO-SiO₂-8%MgO-Al₂O₃-BaO slags ranging from 0% to 5% in BaO

¹ School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, PR China
² Research Center of Metallurgical Engineering and Technology of Shaan Xi, Xi’an University of Architecture and Technology, Xi’an 710055, PR China

^* e-mail: 2414638027@qq.com

Received: 18 May 2018
Accepted: 24 July 2018

Abstract

The sulphide capacities of CaO-SiO₂-MgO-Al₂O₃-BaO slags were measured at 1773 K and 1823 K using the gas-slag equilibration method to estimate the desulphurization ability of the blast furnace slags that contained barium. The effects of basicity, the Al₂O₃ and BaO content of slags on the sulphide capacity of slags were studied. The relationship between the sulphide capacity and the optical basicity of the slags was also investigated. The experimentally determined results were compared with the sulphide capacities estimated by some previously reported models. The results showed that the sulphide capacity increased significantly when the basicity (CaO/SiO₂) increased from 1.0 to 1.2, but decreased when the Al₂O₃ content increased in the slag. The increasing BaO content increased the sulphide capacity. The desulphurizing ability decreased when the BaO content was more than 3.5%. There was a linearly increasing relationship between the optical basicity and the sulphide capacity. The experimentally determined sulphide capacities were closest to the predicted values obtained by the Sosinsky and Sommerville’s model.