关键词: 焙烧;赤泥;改性;比表面积;孔容积;铜离子

Abstract: 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 diffraction (XRD) technologies, such 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 surface area (BET) and average pore volume (Pv) of R-RM firstly increase with the rising of roasting temperature and prolonging of time, then decrease.And under the optimal conditions of 387 ℃ and 2 h, they reach up to 15.7303 m2/g and 0.007946 cm3/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%.

Key words: roasting;red mud;modification;specific surface area;pore volume;copper ion