水泥窑用后镁铁铝尖晶石砖中氯化钾的去除研究  

Potassium chloride removal from used magnesia-hercynite bricks in cement kilns

作　　者：贾小东 田琳 高伟 安建成 Jia Xiaodong;Tian Lin;Gao Wei;An Jiancheng

机构地区：[1]辽宁科技大学高温材料与镁资源工程学院,辽宁鞍山114051 [2]北京通达耐火技术股份有限公司,北京100085

出　　处：《耐火材料》2019年第5期384-387,共4页Refractories

基　　金：国家“十二五”科技支撑计划资助项目(2013BAE03B00);国家级大学生创新创业训练计划项目(201810146106)

摘　　要：水泥窑用后耐火材料中由于含氯化钾而限制了其再利用,为了去除水泥窑烧成带用后镁铁铝尖晶石砖中的氯化钾,对经过拣选、破粉碎的用后砖粉料(<0.154 mm)分别进行煅烧法(分别在800、1 000、1 200、1 400℃保温1 h煅烧)和水浸泡法(分别加入占干料质量20%、40%、60%、80%和100%的水常温浸泡8 h)处理,并对处理前后的试样进行化学组成、矿物组成及显微结构分析。结果表明:采用水浸泡法和煅烧法都可以去除水泥窑用后镁铁铝尖晶石砖中的氯化钾,其中水浸泡法的最佳加水量是干料质量的40%~60%,煅烧法的最佳煅烧温度是1 400℃;煅烧法去除氯化钾效果好于浸泡法,<0.154 mm的粉料经1 400℃煅烧1 h处理后的氯化钾去除率达99.60%。The recycle of used refractory materials in cement kilns is limited by potassium chloride.In order to remove potassium chloride from used magnesia-hercynite bricks in the cement kiln firing zone,the selected and crushed used-brick powder(<0.154 mm)was treated by two different methods:calcination(at 800,1 000,1 200,1 400℃for 1 h)and water immersion(cold water accounted for 20%,40%,60%,80%and 100%,by mass,of the dry powder for 8 h).Then the chemical composition,the mineral composition and the microstructure of the samples before and after the treatment were analyzed.The results show that both the water immersion method and the calcination method can remove potassium chloride from the used magnesia-hercynite bricks in cement kilns,in which the optimum amount of water is 40%-60%of the dry powder,and the optimum calcination temperature is 1 400℃;however,the removal effect of potassium chloride by the calcination method is better than that by the immersion method,while the potassium chloride removal rate of the powder(<0.154 mm)reaches 99.60%after calcination at 1 400℃for 1 h.

关 键 词：氯化钾 镁铁铝尖晶石砖 水泥窑 煅烧法 浸泡法 

分 类 号：TQ175.7[化学工程—硅酸盐工业]