摘要：In this study,modified red mud prepared by calcining at an appropriate temperature was used to remove Fe2+ and Cu2+ from simulated acid mine drainage (AMD) and improve the pH value of the simulated AMD.Among the five different modification temperatures of red mud studied,the red mud modified at a temperature of 450°C achieved the highest treatment capacity.Batch adsorption experiments were conducted to investigate the removal characteristics and mechanisms of Fe2+ and Cu2+ on 450°C-red mud.The results showed that the pH value of the simulated AMD increased to 7.52 from 1.90 and the removal rates of Fe2+ and Cu2+ on 450°C-red mud reached 99.93% and 99.23% with a solid-liquid ratio of 10 g/L,a contact time of 360 min,and a temperature of 25°C.In addition,combined with Fourier transform infrared spectrometer (FTIR) and transmission electron microscope (TEM),the phase composition and microstructure of the red mud before and after modification and 450°C-red mud before and after adsorption were analyzed.The results showed that the -OH and metal-oxyl groups found on the 450°C-red mud surface made significant contributions to the removal of Fe2+ and Cu2+.
关键词：Red mud;high-temperature modification;adsorption;mechanisms;simulated acid mine drainage containing Cu2+ and Fe2+
