Abstract: Three castables (CA₆,MA and β-Al₂O₃) were heat treated at different temperatures (800,1 000,1 200 and 1 350 ℃) and tested in terms of the K₂CO₃ corrosion test at the corresponding temperatures (800,1 000,1 200 and 1 350 ℃),and then the change rates of the apparent porosity,the bulk density,and the CCS of the samples after K₂CO₃ corrosion resistance test were determined,and the phase composition was analyzed.The results show that:(1)all the three castables present good alkali corrosion resistance at 800 ℃;(2)at 1 200 ℃,CA₆ castable reacts with K₂CO₃ to produce a large amount of β-Al₂O₃,which has poor corrosion resistance to K₂CO₃;spinel castable reacts with K₂CO₃ to produce less β-Al₂O₃ and has good corrosion resistance to K₂CO₃;β-Al₂O₃ castable has the weakest reaction with K₂CO₃ and the best K₂CO₃ corrosion resistance.

Key words: calcium hexaluminate, magnesium aluminate spinel, β-alumina, potash, alkali corrosion resistance

摘要： 采用碱蒸气法,对不同温度(800、1 000、1 200和1 350 ℃)热处理后的3种材质(六铝酸钙、镁铝尖晶石和β-Al₂O₃)的浇注料试样,在对应温度(800、1 000、1 200和1 350 ℃)下进行抗K₂CO₃侵蚀试验,然后检测其抗K₂CO₃侵蚀试验后的显气孔率变化率、体积密度变化率和常温耐压强度变化率,并分析其抗K₂CO₃试验后的物相组成。结果表明:1)800 ℃时,3种浇注料的抗K₂CO₃侵蚀性能都很好。2)1 200 ℃时,六铝酸钙浇注料与K₂CO₃反应生成大量β-Al₂O₃,抗K₂CO₃侵蚀性能较差;尖晶石浇注料与K₂CO₃反应生成的β-Al₂O₃较少,抗K₂CO₃侵蚀性能较好;β-Al₂O₃浇注料与K₂CO₃反应最弱,抗K₂CO₃侵蚀性能最好。

关键词: CA₆, MA, β-Al₂O₃, K₂CO₃, 抗碱侵蚀