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De-yong Wang Jun Liu Mao-fa Jiang Fumitaka Tsukihashi Hiroyuki Matsuura 《矿物冶金与材料学报》2011,18(6):646-651
Al-Ti-O inclusions always clog submerged nozzles in Ti-bearing Al-killed steel. A typical synthesized Al2TiO5 inclusion was immersed in a CaO-SiO2-Al2O3 molten slag for different durations at 1823 K. The Al2TiO5 dissolution paths and mechanism were revealed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).
Decreased amounts of Ti and Al and increased amounts of Si and Ca at the dissolution boundary prove that inclusion dissolution
and slag penetration simultaneously occur. SiO2 diffuses or penetrates the inclusion more quickly than CaO, as indicated by the w(CaO)/w(SiO2) value in the reaction region. A liquid product (containing 0.7–1.2 w(CaO)/w(SiO2), 15wt%–20wt% Al2O3, and 5wt%–15wt% TiO2) forms on the inclusion surface when Al2TiO5 is dissolved in the slag. Al2TiO5 initially dissolves faster than the diffusion rate of the liquid product toward the bulk slag. With increasing reaction time,
the boundary reaches its largest distance, the Al2TiO5 dissolution rate equals the liquid product diffusion rate, and the dissolution process remains stable until the inclusion
is completely dissolved. 相似文献
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ZnFe2O4与CaCl2氯化反应机理 总被引:1,自引:0,他引:1
利用CaCl2为氯源与含锌冶金粉尘的重要组分ZnFe2O4进行反应,并利用扫描电镜(SEM)和能量色散谱仪(EDS)分析了ZnFe2O4粉体与CaCl2反应面和反应产物微观形貌的变化,讨论了ZnFe2O4与CaCl2的反应机理.认为反应过程包括一个固液反应和气体挥发过程.ZnFe2O4颗粒被熔融CaCl2包裹,在固液界面发生氯化反应,生成的ZnCl2溶解在CaCl2液膜中,并在气液界面挥发逸出,而CaFe2O4的产物层不断增大,同时伴随着多个颗粒间的黏结和融合长大. 相似文献
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