高硅高钙钒渣钠化焙烧工艺的优化研究

OPTICAL RESEARCH ON VANADIUM SLAG WITH HIGH Si HIGH Ca SODIUM ROASTING PROCESS

针对某钒厂钒渣精粉中SiO_2、CaO含量增加的情况,在实验室以现有工艺参数进行了钠化焙烧,在获得实验室试验基准参数条件下进行了正交和单因素优化试验,较全面考察了焙烧高温区间、碱比、全钒含量和保温时间对钒渣钒焙烧转化率的影响,同时以优化参数进行了验证试验。结果表明,以钒硅比V_2O_5/Si0_2=0.8,钒钙比为V_2O_5/CaO=4.6的高硅高钙钒渣精粉进行钠化焙烧,最优焙烧工艺为:焙烧高温区间:550～820℃,碱比:1.8～2.0;全钒含量:4.8%～5.2%;保温时间:120～140 min,可以使钒焙烧转化率达到85%以上。

According to the increase of Si02, CaO content of vanadium slag powder from some vanadium factory, in the laboratory, sodium roasting was carried out to obtain basic parameters based on the existing process parameters, both orthogonal and single factor tests were conducted, and the effect of roasted high-temperature range, alkali ratio, total vanadium content and holding time on roasting conversion rate of vanadium slag was investigated comprehensively, moreover, validation test was done based on optimal parameter. The research results show that using V205/SiO2=0.8, V20J CaO =4.6 vanadium slag powder to conduct sodium roasting, the optimum roasting process is as follows： roasted high temperature range： 550-820 ℃, alkali ratio： 1.8-2.0, total vanadium content： 4.8%-5.2%, holding time： 120-140 min, the vanadium roasting conversion rate could reach more than 85%.