熔融灰渣侵蚀耐火材料的界面特性研究

Morphological and interfacial characterization of molten slags on the refractory surface

研究了碱酸比不同的3种熔融煤灰(A、J1和J2)在莫来石和刚玉两种耐火材料上的界面特性。结果表明,A对莫来石和刚玉都有很好的润湿性,而J1和J2对这两种耐火材料则经历由不完全润湿到润湿的过程。熔渣与耐火材料(S-R)界面宽度随着接触角减小而增大。从灰渣开始熔融至1 520℃,熔融煤灰J1在耐火材料表面上的接触角随着倾角的增加而减小;当倾角为20°时,其接触角突然增大。SEM-EDS分析表明,由于界面反应,A比J1更容易渗透进入耐火材料内部。对于碱酸比不同的煤灰,渗透和酸碱反应是熔渣对耐火材料腐蚀的关键。

The interfacial properties between three types of coal slags（ A,J1 and J2 with various base/acid ratio） and two refractory materials（ mullite and corundum） were studied.The results indicate that the slag A has good wettability on both of refractory materials.While,the slags J1/J2 have experienced the process from incomplete wetting to whole wetting.The contact angles decrease with increasing of interface width of slag and refractory materials（ S-R）.The contact angles of J1 on mullite decrease with increasing of inclination angles from deformation temperature to 1 520 ℃,but significantly increase when the inclination angle is 20°.The SEM-EDS analysis showthat the quantity of slag A permeating into the refractory material is more than that of J1 slags because of interfacial reaction.The infusion and acid-base reactions are the key factors for the refractory corrosion.