为了将锌焙砂中铁酸锌选择性地分解为ZnO和Fe3O4,研究在CO还原焙烧过程中铁酸锌的分解行为.采用HSC和Factsage软件计算铁酸锌在CO还原气氛下分解的热力学基础,再通过回转窑焙烧试验考察还原焙烧条件对铁酸锌分解行为的影响.结果表明:在适宜的温度和气氛下锌焙砂中的铁酸锌能选择性转化为ZnO和Fe3O4,CO浓度、p(CO)/p(CO+CO2)值、焙烧温度和时间是影响铁酸锌分解的主要因素,提高焙烧温度、延长时间、增加CO浓度和分压有利于铁酸锌的分解,也会促进FeO的生成;在最佳条件下,铁酸锌的分解率近70％,且过还原不严重.经XRD和SEM/EDS分析,产物主要以ZnO、Fe3O4、ZnS和Zn2SiO4为主,且颗粒粒度较小、疏松多孔及互相包裹严重.
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