Effect of zircon on sintering behavior and alkali corrosion resistance of bauxite-based mullite homogeneous grogs

doi:10.3969/j.issn.1001-1935.2026.05.002

Abstract

Abstract: To improve the alkali corrosion resistance of bauxite-based mullite homogeneous grogs,a series of ZrO₂-doped bauxite-based mullite homogeneous grogs were prepared by wet mixing,shaping and calcining at 1 350-1 650 ℃ for 4 h,using grade Ⅱ high-alumina bauxite as the main raw material and zircon as the modifying additive.The effects of varying zircon additions (0,2%,4%,and 6%,by mass) on the sintering behavior,phase composition,and cold physical properties of the grogs were investigated,and their alkali corrosion resistance was evaluated by the static crucible method.The results indicate that between 1 450 and 1 650 ℃,SiO₂ generated from zircon decomposition forms a SiO₂-rich liquid phase at the ZrO₂ interface,which accelerates the sintering shrinkage of the mullite homogeneous grogs.Concurrently,a portion of this SiO₂-rich liquid phase participates in the mullitization reaction during calcination and is consumed in situ.ZrO₂ decomposed from zircon is dispersively distributed in the glass phase and at mullite grain boundaries,increasing the viscosity of the glass phase.After calcination at 1 650 ℃,the apparent porosity of the homogeneous grogs decreases from 0.63% to 0.20% with the increase of zircon addition.Furthermore,the increased ZrO₂ addition inhibits the diffusion and penetration rate of K⁺ in alkaline corrosion environments,thereby improving the alkali corrosion resistance of the bauxite-based mullite homogeneous grogs.When the zircon addition is 4%,the sample calcined at 1 650 ℃ for 4 h exhibits high density,excellent cold mechanical properties and favorable alkali corrosion resistance.

Key words: bauxite, zircon, bauxite-based mullite homogeneous grogs, alkali corrosion resistance

摘要： 为提升矾土基莫来石均质料的抗碱侵蚀性能,以Ⅱ级高铝矾土为主要原料,锆英石为改性添加剂,经湿混、成型、1 350~1 650 ℃保温4 h煅烧制备了系列ZrO₂掺杂矾土基莫来石均质料,研究了锆英石加入量(加入质量分数分别为0、2%、4%和6%)对其烧结特性、物相组成及常温物理性能的影响,并采用静态坩埚法评估其抗碱侵蚀性能。结果表明:1 450~1 650 ℃煅烧后,锆英石分解产生的SiO₂在ZrO₂界面形成富SiO₂液相,该液相可加快莫来石均质料的烧结收缩进程。同时,部分富SiO₂液相在煅烧过程中参与莫来石化反应并被原位消耗。锆英石分解产物ZrO₂以弥散态分布于均质料的玻璃相及莫来石晶界处,提高了玻璃相的黏度。经1 650 ℃煅烧后,随着锆英石加入量的增加,均质料的显气孔率从0.63%降至0.20%,且增加ZrO₂加入量可抑制碱蚀环境中K⁺的扩散与渗透,从而提升莫来石均质料的抗碱侵蚀性能。当锆英石加入量为4%(w)时,1 650 ℃保温4 h煅烧后试样兼具高致密度、优异的常温力学性能与良好的抗碱侵蚀性能。

关键词: 铝矾土, 锆英石, 矾土基莫来石均质料, 抗碱侵蚀性能

CLC Number:

TQ175

Zhao Fei, Li Ruoxi, Wang Yali, Mai Haixiang, Zuo Yudong, An Jiancheng, Lian Weikang. Effect of zircon on sintering behavior and alkali corrosion resistance of bauxite-based mullite homogeneous grogs[J]. Refractories, 2026, 60(5): 376-382.

赵飞, 李若茜, 王亚利, 麦海香, 左玉冬, 安建成, 连伟康. 锆英石对矾土基莫来石均质料烧结行为及抗碱侵蚀性的影响[J]. 耐火材料, 2026, 60(5): 376-382.

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URL: http://www.nhcl.cn/EN/10.3969/j.issn.1001-1935.2026.05.002

http://www.nhcl.cn/EN/Y2026/V60/I5/376

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