磁化焙烧-磁选法回收循环流化床固硫灰中铁  

Recycling of the iron resources of CFBC fly ash by magnetizing roasting-magnetic separation

作　　者：巫侯琴[1,2] 李军[1] 卢忠远[1] 徐龙华[2,3] 管波[2] 韦燕飞[2] 

机构地区：[1]西南科技大学,四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,绵阳621010 [2]西南科技大学环境与资源学院,绵阳621010 [3]西南科技大学固体废物处理与资源化教育部重点实验室,绵阳621010

出　　处：《环境工程学报》2013年第4期1500-1504,共5页Chinese Journal of Environmental Engineering

基　　金：“十二五”国家科技支撑计划项目(2011BAA04B04)

摘　　要：西南地区原煤中硫铁矿含量相对较高,其燃煤灰渣一般呈暗红色,有一定量赤铁矿存在,有必要回收这部分铁资源。采用磁化焙烧—磁选工艺对循环流化床燃煤固硫灰中的铁资源进行了回收。研究结果表明,焙烧温度800℃,焙烧时间90 min,还原剂用量5%,粗选磁场强度为200 kA/m,精选磁场强度为80 kA/m条件,能够获得品位58.02%的铁精矿,回收率为76.27%。In southwest China, lots of dark red coal-fired ashes with certain amount of hematite are generated because of the presence of pyrites in raw coals. It is necessary to recycle this part of iron resources in coalfired ashes with relatively high content of iron. Iron recycling of circulating fluidized bed combustion （CFBC） fly ashes by magnetizing roasting-magnetic separation was studied. Results showed that iron with content grade of 58.02% and recovery rate of 88.27% could be obtained under the experimental conditions： -800℃ of roasting temperature, 90 min of roasting time, 5% of reducing agent dosage, 200 kA/m of magnetic field intensity and 80 kA/m of magnetic field intensity of cleaning.

关 键 词：固硫灰 磁化焙烧 磁选 铁 

分 类 号：X752[环境科学与工程—环境工程]