煤灰在不同耐火砖表面的润湿性与侵蚀性研究

通过观察煤灰柱在耐火材料表面随温度升高的形态变化和接触角的变化,来判断煤灰在耐火材料表面的润湿性;用扫描电镜(SEM)和能谱分析(EDS)等方法对煅烧煤灰过程中煤灰对耐火材料的侵蚀和渗透进行了观察测试,就渣样的形貌、耐火材料横断面的扫描图像及其元素变化进行了分析。结果表明,温度是影响煤灰在耐火材料表面润湿性和侵蚀性的重要因素;不同耐火材料的抗煤灰侵蚀不同,主要取决于耐火材料的组成和结构,其中结构致密度尤其重要;煤灰对耐火材料的侵蚀其实就是煤灰与耐火材料中各矿物元素互相侵蚀与渗透的结果,在侵蚀过程中还伴随着各种化学反应来抑制或促进侵蚀;煤灰在耐火材料表面的润湿性与煤灰对耐火材料的侵蚀性基本上表现出一致性。

Wettability and erodibility of coal ash on the surface of different refractories

Through observing the change of morphology and contact angle of coal ash column on the surface of refractories with increasing temperature,surface wettability of refractories was determined.The erosion and permeation behavior of coal ash on refractories during coal ash sintering process were observed and analyzed by using scanning electron microscope(SEM) and energy spectrum analysis.The morphology of slag sample,cross-section image of refractories and the change of element were studied.The results show that temperature is an important factor which influences the wettability and erodibility of coal ash on the surface of refractories.The erosion-resistance to coal ash varies between different refractory,which depends mainly on the composition and structure of refractories.Among these factors,compact structure is especially important.In fact,the corrosion of coal ash on refractories is the result of corrosion and permeation mineral elements between coal ash and refractory materials.During the process of corrosion,chemical reaction inhibits or promotes the corrosion.The wettability of coal ash on the surface of refractories is accordant with erosion behavior of coal ash on refractories.