表面改性加重质的流态化及其分选性能  

Fluidization of medium solids after hydrophobic surface modification and its separating characteristics

作　　者：骆振福[1] 郭进[1] 赵跃民[1] 陈增强[1] 梁春成[1] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221116

出　　处：《中国矿业大学学报》2011年第1期111-115,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(90510002);国家自然科学基金委员会创新研究群体科学基金项目(50921002);国家高技术研究发展计划(863)项目(2007AA05Z318);中国矿业大学中央高校基本科研业务费专项资金项目(2010ZDP01A06)

摘　　要：用离子性改性药剂改性磁铁矿粉,再用非离子性改性剂聚乙二醇-4000（PEG-4000）进行二次包覆,提高磁铁矿粉表面疏水性.结果表明,油酸钠和PEG-4000使磁铁矿粉表面由亲水性变为疏水性,以油酸钠作改性剂,最佳改性条件为：80℃,30 min,2%改性剂用量,20%矿浆浓度;以PEG-4000作改性剂,最佳改性条件为：40℃,30 min,2%改性剂用量,20%矿浆浓度.改性后磁铁矿粉临界水分可由0.5%提高到0.8%.以改性磁铁矿粉作为加重质,形成的流化床具有良好的分选性能,采用6~13 mm原煤,分选密度为1.57 g/cm3时,可能偏差E值达0.068.The ionic modification agent was used to modify magnetite powder,and the nonionic modification agent polyethylene glycol-4000（PEG-4000） was used to coat the modified magnetite powder.The results show that the hydrophobicity of modified magnetite powder was improved obviously.The optimal modification conditions treated at 80 ℃ for 30 minutes with a dosage of 2% and pulp concentration of 20% were achieved using sodium oleate as agent,and that treated at 40 ℃ for 30 minutes with a dosage of 2% and pulp concentration of 20% were also achieved using PEG-4000 as agent.The critical surface moisture of modified magnetite powder was allowed from 0.5% to 0.8%.The fluidized bed using modified magnetite powder as medium solids is of good separating performance with E value of 0.068 for the 6-13 mm feedstock under separating density of 1.57 g/cm3.

关 键 词：表面改性 加重质 流化床 分选 

分 类 号：TQ028.6[化学工程]