Regular Article

The viscous behavior and potassium removal capacity of CaO–SiO₂–8wt%MgO–17wt%Al₂O₃–2.5wt%BaO–K₂O slag

¹ State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, PR China
² School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, PR China

^* e-mail: zuohaibin@ustb.edu.cn

Received: 24 October 2019
Accepted: 17 February 2020

Abstract

The viscous behavior and potassium removal capacity of CaO–SiO₂–8wt%MgO–17wt%Al₂O₃–2.5wt%BaO–K₂O slag system with CaO/SiO₂ of 1.07 were studied. The effect of K₂O content ranging from 0 to 5 wt% on the viscosity, slag structure, apparent activation energy and potassium removal rate of present slag were analyzed. The results showed that with increase of K₂O content in slag, the viscosity and apparent activation energy tended to increase. When adding K₂O into the present slag, K⁺ ion rather than Ba²⁺ could preferentially compensate [AlO₄] tetrahedron and more complex network structures would be formed, leading to higher polymerization degree of slag. The potassium removal rate was related to the reduction degree of K⁺ by carbon, and with rising of temperature and increasing of K₂O content there was a decreasing trend for the potassium removal capacity of slag.