摘要
本研究选取铬刚玉、镁铬刚玉和烧结锆刚玉3种不同材质的耐火砖,在不同酸碱熔渣环境下进行侵蚀试验并探索侵蚀成因。结果表明,酸性熔渣环境下,铬刚玉砖抗侵蚀性能较好,镁铬刚玉砖侵蚀较为严重,烧结锆刚玉砖侵蚀明显;随温度升高、时间延长,铬刚玉砖的抗侵蚀性能最优,镁铬刚玉砖抗侵蚀性能、抗热膨胀性能均较差,烧结锆刚玉砖侵蚀最严重;中性熔渣环境下,铬刚玉砖抗侵蚀性能降低,侵蚀状况略微明显,镁铬刚玉砖侵蚀状况相对较好,液面线上方出现了一定程度的裂缝,烧结锆刚玉砖侵蚀速度较快,液面线处出现明显“凹槽”;碱性熔渣环境下,铬刚玉砖表面被侵蚀恶化明显,镁铬刚玉砖侵蚀状况不明显,烧结锆刚玉砖被侵蚀明显。对侵蚀成因进行分析发现,侵蚀是由焚烧炉渣原渣中含有的NaO非晶态矿物、结晶态石英和外加钙质氧化物与耐火材料中化学成分发生反应导致的,侵蚀速度与耐火材料化学成分有关。
Three kinds of refractory bricks, chrome corundum, magnesia-chromium corundum and sintered zirconium corundum, were selected to conduct erosion experiments and to explore the causes of erosion in different acid-base slag environments. The results show that in the acid slag environment, the corrosion resistance of chrome corundum bricks is better, the erosion of magnesia-chromium corundum bricks is more severe, and the erosion of sintered zirconium corundum bricks is obvious. With rising of temperature and time increase, chrome corundum brick comes the best in terms of corrosion resistance. The performance of magnesia-chromium corundum bricks in terms of corrosion resistance and thermal expansion resistance is not good. The erosion of sintered zirconium corundum bricks is more severe. Under neutral slag environment, the corrosion resistance of chrome corundum bricks is reduced, and the erosion is a little bit obvious. The corrosion condition of magnesia-chromium corundum bricks is relatively good, and a certain degree of cracks appear above the liquid surface line. The sintered zirconium corundum brick erodes faster, and there are obvious “grooves” at the liquid surface line. Under basic slag environment, the surface of the chrome corundum brick is eroded and deteriorated obviously. The erosion of magnesia-chromium corundum bricks is not obvious, and the erosion of sintered zirconium corundum bricks is obvious. The analysis on the causes of erosion shows that the raw incinerator slag contains NaO amorphous minerals and crystalline quartz, and the added calcium oxides reacts with the chemical composition of the refractory material to cause erosion, and the erosion rate is related to the chemical composition of the refractory material.
作者
李兴杰
LI Xing-jie(China ENFI Engineering Corporation,Beijing 100080,China)
出处
《中国有色冶金》
CAS
北大核心
2022年第4期106-114,共9页
China Nonferrous Metallurgy
基金
国家重点研发计划项目(2019YFC1907000)。
关键词
危废焚烧炉渣
耐火材料
镁铬刚玉砖
烧结锆刚玉砖
铬刚玉砖
抗侵蚀性能
侵蚀成因
hazardous waste incinerator slag
refractory material
magnesia-chromium corundum brick
sintered zirconium corundum brick
chrome corundum brick
corrosion resistance
corrosion causes
