表面改性加重质的流化特性与分选特性  

Fluidization Characteristics and Separating Characteristics of Medium Solid after Surface Modification

作　　者：耿文瑞[1] 朱建凤[1] 

机构地区：[1]安徽省琅琊山矿业总公司选矿厂

出　　处：《现代矿业》2013年第5期31-35,共5页Modern Mining

摘　　要：为提高空气重介质流化床对不同外在水分入选煤的适应性,对磁铁矿粉进行表面疏水改性是一条有效的途径。研究了表面改性对磁铁矿粉流化特性的影响,结果表明:表面改性提高了磁铁矿粉的最小流化速度,但对床层压降分布无显著影响;与改性前相比,床层密度更均一、稳定,有利于形成高质量的流化状态;随着入选煤的外在水分的逐渐提高,对改性前后的磁铁矿粉流化特性都有影响,表面改性使入选煤的外在水分上限从2%提高到4%,并且在水分含量为4%时仍然保持较好的流化状态。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,分选试验结果表明,入选煤外在水分为3%时,分选密度为1.55和1.82 g/cm3时,可能偏差E值均为0.075。To increase the adaptability of air dense medium fluidized bed with different external moisture selected coal, surface hydrophobic modification of magnetite powder is a effective way. Influence of surface modification to fluidization characteristics of magnetite powder was studied, the results indicated, surface modification increased the minimum fluidization velocity of magnetite powder, but no apparent influence to distribution of pressure drop; density of bed was more uniform and stable compared with before modification, in favor of formation of fluidized state with high quality ; as gradually increase of ex- ternal moisture of selected coal, had influence to fluidization characteristics of magnetite powder of both unmodified and modified, surface modification made the external moisture limit of selected coal increased from 2% to 4%, and still keep good fluidized state when moisture content 4%. Using modified magnetite powder as medium solid, formed fluidized bed had good separating properties, result of screening test showed, possible deviations E value was all 0. 075 when external moisture of selected coal was 3 % and density of separation was 1.55 g,/cm3 or 1.82 g/cm3.

关 键 词：疏水 加重质 流化特性 分选特性 

分 类 号：TD455.7[矿业工程—矿山机电]