Fe_3O_4存在下配煤制备水处理用磁性压块活性炭  

Preparation of magnetic briquetted activated carbon for drinking water treatment in the presence of Fe_3O_4 from blending coals

作　　者：蒋煜[1,2] 解强[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]大同煤矿集团有限责任公司,山西大同037003

出　　处：《中国矿业大学学报》2017年第1期169-176,共8页Journal of China University of Mining & Technology

基　　金：中央高校基本科研业务费资助项目(2009KH10)

摘　　要：在Fe_3O_4存在下以大同烟煤为主料、胜利褐煤为配煤,采用压块活性炭工艺制备了活性炭,表征了活性炭吸附性能、磁性能和孔结构,并通过正交实验,以焦糖脱色率为活性炭净水性能指标研究优化配煤比例及主要工艺参数.结果表明:无Fe_3O_4存在时向大同煤中配入褐煤不利于压块活性炭孔的发育;温度升高可强化活化剂对孔壁烧失作用,导致孔隙扩大;Fe_3O_4的催化作用促进中、大孔发育,提高活性炭焦糖脱色率,并给活性炭赋磁.添加质量分数为6%的Fe_3O_4时获得2组优化工艺参数,即:100%大同煤、活化温度980℃、活化时间3h,或大同煤与胜利褐煤质量比为80∶20、活化温度980℃、活化时间3.5h,可制得易于磁选分离、焦糖脱色率分别为79%和76%的优质水处理用活性炭.A series of activated carbons were prepared by briquetting method from Datong bitu- minous coal and Shenli lignite blending in the presence of Fe3 O4, and their adsorption perform- ance, magnetic properties and pore structure were characterized. Besides, the primary process parameters and coal blending ratio were optimized by means of orthogonal experiment in which caramel decoloration rate was used as an index of water clarifying performance. The results show that the introduction of Shenli lignite to Datong bituminous coal in the case of Fe3 O4-free has negative effects on pore development of activated carbon; higher temperature can effective- ly enhance the burning loss of pore wall by activating agent which results in the enlargement of porosity; the catalytic effect of Fe3O4 accelerates growth of mesopores and/or macropores, im- proves the caramel decoloration rate of activated carbon and gives it magnetic property. Final- ly, two sets of optimized process parameters were obtained with 6% Fe3O4 addition in feed- stock, which are （1） 100% Datong coal with activation temperature of 980 ℃ and activation time of 3 h, and （2） Blending of Datong coal and Shenli lignite with mass ratio of 80 ： 20, acti- vation temperature of 980 ℃, activation time of 3.5 h, by which magnetic-separable high quali- ty activated carbon for water treatment with caramel decoloration rate of 79% and 76 % can beprepared respectively.

关 键 词：磁性活性炭 水处理 焦糖脱色率 配煤 

分 类 号：TQ424.1[化学工程]