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作者：Xiangshuai Hou; Zheng Miao; Yifei Du; Junfeng Chen; Yaping Cao; Wen Yan; Yan Xia; Lei Wang; Shaowei Zhang; Nan Li

作者單位：Wuhan University of Science and Technology, Wuhan;Joint International Research Laboratory of Refractories and Metallurgy, Ministry of Education, China;Hebei Guoliang New Materials Co., Ltd, Tangshan, Zhejiang Zili High Temperature Technoligy CO., Ltd, Shaoxing, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, ;College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK;The State Key Laboratory of Refractories and Metallurgy,

刊名：Ceramics International

ISSN：0272-8842

出版年：2024-10-10

卷：50

期：21

起頁：42729-42738

止頁：

分類號：

語種：英文

關鍵詞：Brine magnesium hydroxide;MgO aggregate;Microstructure;Salt lake resources;Corrosion behaviors

內容簡介

High-purity magnesia refractories were fabricated by brine magnesium hydroxide from the salt-lake brine (Qinghai Salt Lake) and Y2O3 as an additive at 1780 °C. It avoided the substantial CO2 emissions and ultra high temperature sintering process (＞1900 °C) when compared with the conventional magnesite-calcination technical approach. The results confirmed that Y2O3 was dispersed on the MgO grains boundaries in the fabricated MgO aggregates, resulting in a decrease in apparent porosity and enhancing the grains' boundaries. With 3 wt% addition of Y2O3, the apparent porosity and bulk density of the sample reached to 15.9 % and 3.10 g/cm³ from 37.9 % to 2.30 g/cm³ of blank control group, respectively. Compared to the blank control without Y2O3-adding, the sample with 5 wt% Y2O3 exhibited a 54.17 % increase in the resistance to molten slag. SEM results indicated that the incorporation of Y2O3 in samples increased the porosity of small pores and enhanced grains boundaries, thereby suppressing slag's penetration. Furthermore, the Y2O3-adding was employed to disperse the MgO grains boundaries and existed as separate phases for grains boundaries enhancement. The slag attack of the fabricated MgO–Y2O3 refractory raw materials were controlled by an inter-crystalline corrosion process.