镁锆砖的抗侵蚀性能研究

Research on Corrosion Resistance of Magnesia-zirconia Brick

采用两种不同炉渣,用静态坩埚法对镁锆砖的抗侵蚀性能进行了研究,并通过SEM和XRD等分析手段对镁锆砖的侵蚀机理进行了探索。结果表明:两种炉渣对镁锆砖的侵蚀情况略有不同;抗渣试验过程中未发生ZrO2的晶相转变。镁锆砖的侵蚀机理为:渣中的CaO与砖中的ZrO2发生反应生成高熔点物相CaZrO3,CaZrO3的生成在方镁石晶间形成了致密保护层,从而阻止了渣对镁锆砖的继续侵蚀。

The corrosion resistance of magnesia-zirconia brick is studied with two different kinds of slag and by static crucible method and the corrosion mechanism of magnesia-zirconia brick by two kinds of slag is probed by the analysis means, such as SEM and XRD etc. The result shows that the corrosion degrees of magnesia-zircon brick by two kinds of slag are slightly different. No change of crystal phase of zirconia occurs during slag resistance test. The corrosion mechanism of magnesia-zirconia brick by two kinds of slag is that the CaO in slag reacts with ZrO2 in the brick to form high melting point phase CaZrO3 and the formation of CaZrO3 forms the dense protection layer between the crystals of periclase so as to prevent the further corrosion of slag into magnesia-zirconia brick.