Title: Technology and Mechanism of Leaching Active Aluminum Occurred in Metakaolin
The coal series kaolinite from Hubei Yichang was characterized using XRD, XRF, TG/DSC. The technical method of activated aluminium leached with the roasted coal series kaolinite has been investigated. Activity of metakaolin was evaluated by rate of aluminum leaching that was examined using compleximetry of EDTA. The study found that the best condition of the preparation of metakaolin to get the maximum activity are heating rate of 5 ℃/min, roasting temperature 750 ℃ and heat preservation for 5 h. The leaching rate of aluminum and content of activated aluminium
were72.93% and 28.13% respectively for the metakaolin as 6.19 mol/L of HCl concentration, leaching for 2 h at room temperature.