焙烧对赤泥比表面积及孔隙结构影响的研究  

Effect of Roasting on the Specific Surface Area and Pore Structure of Red Mud

作　　者：练佳佳 唐庆杰[1] 吴文荣[1] 曹建亮[1] 马名杰[1] 

机构地区：[1]河南理工大学化学与化工学院,焦作454000

出　　处：《硅酸盐通报》2017年第6期2106-2111,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51404097);河南省高校基本科研业务费专项资助(NSFRF140601);河南省高等学校重点科研项目(16B430005)

摘　　要：采用焙烧方法对赤泥进行改性,通过氮吸附、扫描电镜(SEM)、红外光谱(IR)和X射线衍射(XRD)技术分析焙烧条件对赤泥微观结构的影响,例如焙烧温度和时间,并通过铜离子吸附实验对改性赤泥(R-RM)的吸附性能做出评价。结果表明,R-RM的比表面积和平均孔容积随焙烧温度升高和时间的延长都是先增大后减小,在387℃/2h条件下分别达到最大值15.7303 m2/g和0.007946 cm3/g。焙烧能够使赤泥中的碳酸盐化合物分解,提高颗粒孔隙率;使结合水蒸发,从而疏通内部孔道,降低水膜对吸附质的传质阻力。在室温下,R-RM对20 mg/L铜离子的最大吸附容量为1.89 mg/g,去除率达94.5%。The red mud was modified by roasting. The effect of roasting conditions on the micro-structure of red mud was analyzed by N2 adsorption, scanning electron microscopy （SEM）, infrared spectrum （IR） and X-ray diffraetion （XRD） teehnologies, sueh as roasting temperature and time. And the copper ion adsorption property of the modified red mud （R-RM） was also investigated. The results show that, the specific surfaee area （BET） and average pore volume （ P,, ） of R-RM firstly inerease with the rising of roasting temperature and prolonging of time, then deerease. And under the optimal conditions of 387 ℃ and 2 h, they reach up to 15. 7303 m^2/g and 0. 007946 cm^3/g, respectively. The porosity is improved by decomposing the carbonate compounds, and the channels of particles are cleared by evaporating the combined water, thus lowing the mass transfer resistance of water-film upon adsorbate. Under room temperature, the maximum adsorption capacity of R-RM to 20 mg/L copper ion aqueous solution is 1.89 mg/g, and the removal is 94.5%.

关 键 词：焙烧 赤泥 改性 比表面积 孔容积 铜离子 

分 类 号：X801[环境科学与工程—环境工程]