Experimental Study on High-phosphorus Hematite Gasification Dephosphorizing in Sintering Process
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摘要: 采用小球烧结方法研究不同因素对高磷赤铁矿烧结气化脱磷的影响。结果表明:气化脱磷反应主要是气固相反应的过程。在弱氧化气氛条件下,高磷赤铁矿的气化脱磷率随反应温度升高、碱度降低、恒温时间延长而增加。在脱磷剂加入量6.8%的条件下,比较适宜的气化脱磷工艺参数为配碳4%、反应温度1 250℃、碱度1.2、恒温时间30 min,此时气化脱磷率达到了23.8%。并对最终焙烧产物进行了XRD微观检测分析,证实了气化脱磷反应的发生。Abstract: The effects of various factors on high-phosphorus hematite gasification dephosphorizing in sintering process were studied through pellet sintering.The results show that gasification dephosphorizing is mainly a gas-solid phase reaction process.Under low oxidizing atmosphere,the rate of high-phosphorus hematite gasification dephosphorizing increases when the increasing reaction temperature,reducing the basicity and extending the holding time.When the the content of dephosphorization agent is 6.8%,the optimal gasification dephosphorizing process parameter are as follows:carbon content 4%,reaction temperature 1 250℃,basicity 1.2,reaction holding time 30 min,and the resulting gasification dephosphorization rate can reach 23.8%.XRD microscopic detection on the finally calcined product confirmed the occurrence of gasification dephosphorization reaction.
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