文献类型：期刊文献

英文题名：Effect of zirconia content and mesoscopic distribution on properties of MgO-MgAl2O4-ZrO2 refractory raw material derived from Mg resources in salt lakes

作者：Liu, Qingzhu[1];Zhang, Ye[1];Yu, Jianguo[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Joint Int Lab Potassium & Lithium Strateg Resource, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：13

期号：3

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20252218516328);WOS:【SCI-EXPANDED(收录号:WOS:001492006900011)】；

基金：The work was financially supported by the National Natural Science Foundation of China (52204268) and China Postdoctoral Science Foundation (2023M741173) .

语种：英文

外文关键词：Bischofite; flowery magnesium hydrate; MgO-MgAl 2 O 4 -ZrO 2 refractory raw materials; spinel-wrapped periclase structure; (MG)4.68 Al (2.64) Zr (1.68) O (12)

摘要：MgO-MgAl2O4-ZrO2 material is a promising and extensively utilized refractory. To address the quality and environmental issues during the traditional synthesis of this material using magnesite single-phase raw materials with high impurities and inadequate phase dispersion, the high bulk density MgO-MgAl2O4-ZrO2 refractory raw materials were directly synthesized at 1600 degrees C using flowery magnesium hydrate prepared by bischofite and explored for resistance to thermal shock and slag erosion. The effect of ZrO2 content on the microstructure, densification, thermal shock resistance, and slag erosion resistance of MgO-MgAl2O4-ZrO2 refractory raw materials was studied, and the relationships between phase distribution characteristics and properties were analyzed. The results indicated that the material exhibited a high bulk density of 3.75 g center dot cm- 3, with an apparent porosity of 0.63 % and a linear shrinkage rate of 19.32 %. The material was predominantly comprised of periclase, spinel, and MgO-stabilized ZrO2 (Mg0.2Zr0.8O2), showing a spinel-wrapped periclase structure within ZrO2 and spinel single crystals embedded in the grain boundaries. The zirconia promoted the sintering ripening of fine spinel particles and limited the development of cracks during thermal shock, resulting in the highest residual strength ratio of 27.20 %. The thermal expansion coefficient of the material was 11.98 x 10-6/K. However, zirconia had no significant effect on slag erosion resistance. An excess of zirconia led to the in-situ development of the metastable phase Mg4.68Al2.64Zr1.68O12 and increased zirconia-spinel interaction, which might have caused material breakdown during thermal shock and a weakened slag penetration. This study provides an eco-friendly method for the preparation of MgO-MgAl2O4-ZrO2 refractory raw materials with high densities, appropriate flexural strength, residual strength ratio, and low slag corrosion and penetration depth.