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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.
The reaction of ZnFe2O4, an important component of Zn-containing metallurgical dust, with CaCl2 as the chlorine source was investigated. The changes of the reaction surface and microstructure of ZnFe2O4 powder with CaCl2 were analyzed by scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) The reaction mechanism between ZnFe2O4 and CaCl2 was discussed, and the reaction process consisted of a solid-liquid reaction and gas volatilization.ZnFe2O4 particles were encapsulated by molten CaCl2 and chlorinated at the solid-liquid interface, and ZnCl2 was dissolved in the CaCl2 liquid membrane Volatilized and escaped at the gas-liquid interface, while the product layer of CaFe2O4 is continuously increased, accompanied by the adhesion and the fusion between multiple particles.