Effect of Li2O on rheological properties, structure, and crystallization of mould flux for high-speed thin-slab continuous casting. (7th February 2022)

• Record Type: Journal Article
• Authors: Yuan, Zhipeng; Zhu, Liguang
• Is Part Of: Ironmaking & steelmaking. Volume 49:Number 2(2022)
• Page Start: 226
• Page End: 237
• Publication Date: 2022-02-07
• Subjects: Crystallization -- mould flux -- rheological properties -- structure of molten slag -- break temperature -- viscosity -- degree of polymerization -- Lithium metaaluminate; Iron industry and trade -- Periodicals; Steel industry and trade -- Periodicals; 669.1
• DOI: 10.1080/03019233.2021.1985911
• Languages: English
• ISSNs: 0301-9233

Abstract

ABSTRACT: The effects of Li2 O content on the rheological properties, melt structure, and crystallization behaviour of mould flux for high-speed thin slabs are systematically studied. The results show that when the Li2 O content increases from 0.86% to 5.81%, the viscosity of the mould flux decreases, the melting range increases, and the break temperature initially decreases followed by an increase. Further study shows that Li2 O can release O 2− and depolymerize complex Si–O–Si and Al–O–Al structural units into Si–O and Al–O structures. Simultaneously, Li2 O can compensate for the charge between Si 4+ and Al 3+ by providing Li + in combination with the mould-flux network structure, making the Si–O–Al structure unit more stable. With the increase in Li2 O content in the slag, the crystallization of the mould flux is inhibited at first, and subsequently, it is enhanced. When the Li2 O content is 4.33%, the precipitation of Lithium metaaluminate enhances the crystallization behaviour of the mould flux.