添加剂对改性含钛高炉渣氯化过程的影响  

Effect of Additives on Chlorination of Modified Titania-Containing Blast Furnace Slag

作　　者：付念新[1] 娄太平[1] 都兴红[1] 隋智通[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2012年第5期698-701,共4页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究发展计划项目(2007CB613503)

摘　　要：针对高钙镁改性含钛高炉渣氯化过程物料易粘结问题,通过热力学分析及X射线衍射检测研究了添加剂防止粘结的作用机制,并考察了温度、配碳量、气体（N2＋Cl2）流量和氯气分压对氯化行为的影响.结果表明：氯化过程中添加剂磷酸优先与CaO作用生成高熔点的Ca3（PO4）2以及后者与CaCl2反应生成Ca5（PO4）3Cl,避免了低熔点钙镁氯化物富集而造成的物料粘结.当反应条件为温度850~900℃、配碳过量15%、气体流量400 mL/min和氯气分压40 kPa,得到最佳的氯化结果,60 min内氯化率可达到90.8%~93.5%.To solve the easy sticking of the particles in the chlorination of modified titania-containing blast furnace slag,the mechanism of preventing the sticking by additives was studied by XRD and thermodynamics analysis.Meanwhile,the effects of temperature,excessive carbon content,gas flow rate（N2＋Cl2） and chlorine partial pressure on the chlorination behavior were investigated.The results showed that the prior reaction of phosphoric acid as an additive with CaO occurs to form Ca3（PO4）2 with a high-melting point,and the latter reacts with CaCl2 to give Ca5（PO4）3Cl.Thereby the sticking of the particles caused by the aggregation of low-melting point calcium and magnesium chlorides is avoided.The best chlorination results are obtained at 850~900 ℃ with the excessive carbon content of 15%,the flow rate of 400 mL/min and the chlorine partial pressure of 40 kPa,and the chlorination ratio reaches 90.8%~93.5% in 60 min.

关 键 词：含钛高炉渣 氯化率 物料粘结 添加剂 磷酸钙 氯磷灰石 

分 类 号：TF111.19[冶金工程—冶金物理化学]