中孔煤基磁性活性炭的制备及性能表征  

Preparation and characterization of magnetic mesopores activated carbon from lignite

作　　者：姜勇[1,2] 张庆伟[2] 王胜[1] 解强[2] 王新乐[1] 姚鑫[2] 

机构地区：[1]中海油能源发展股份有限公司安全环保分公司,天津300451 [2]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《洁净煤技术》2015年第3期1-5,10,共6页Clean Coal Technology

基　　金：中海油能源发展股份有限公司资助科研项目(HFXMLZ-CY201303)

摘　　要：为提高活性炭的回收性能,以褐煤为原料,Fe3O4为赋磁剂,采用一步法制备了中孔煤基磁性活性炭,并通过低温氮气吸附、X射线衍射光谱(XRD)和振动样品磁强计(VSM)对磁性活性炭的比表面积、孔隙结构、赋磁剂晶型、磁性能进行表征,研究了炭化和活化条件对磁性活性炭性能的影响。结果表明,Fe3O4不仅能催化炭烧蚀,而且能赋予活性炭磁性,最终以生成的Fe O、γ-Fe2O3和未反应的Fe3O4形式分散在磁性活性炭内。在Fe3O4添加量6%,炭化温度650℃,炭化60 min,活化温度930℃,活化时间120 min,水蒸气流量0.77 g/(g·h)的优化工艺条件下,煤基磁性中孔活性炭的比表面积达到370 m2/g,中孔率达到55.7%,比饱和磁化强度1.36 emu/g,剩磁0.46 emu/g,矫顽力643.17Oe,比磁化率7.19×10-6m3/kg。该煤基磁性活性炭属弱磁性矿物类,可采用强磁选机进行磁选回收。In order to improve adsorptive property of activated coke,a magnetic activated carbon with developed mesopores was prepared by one-step method taking lignite as raw material,Fe3 O4 as magnetic reagent. The specific surface area,pore structure of activated coke and the crystal type,properties of magnetic reagent were characterized by low temperature nitrogen adsorption,X-ray diffraction and vibrating sample magnetometer. The effects of carbonization and activation conditions were researched. The results showed that the Fe3 O4 in magnetic activated carbon which was able to catalyze ablation of carbon and magnetize activated carbon,existed in the forms of FeO,γ-Fe2 O3 and unreacted Fe3 O4 . The optimized technical parameter was that the carbonization and the following activation of magnetic activated carbon with 6% Fe3 O4 were carried out at 650 ℃ for 60 minutes and 930 ℃ for 120 minutes respectively. The activation vapour flow was 0. 77 g/（g·h）based on the weight of carbonized material. The specific surface area of magnetic activated carbon at the optimized conditions was 370 m2 / g,the ratio of mesopore volume was 55. 7% ,the saturation magnetization was 1. 36 emu/ g,the remanence was 0. 46 emu/ g, the coercivity was 643. 17 Oe and the specific susceptibility was 7. 19x10-6 m3 / kg respectively. The magnetic activated carbon was weak magnetic mineral,and it could be recovered by high intensity magnetic separator.

关 键 词：煤基活性炭 磁性 褐煤 中孔活性炭 

分 类 号：TQ424[化学工程] TD849[矿业工程—煤矿开采]