| Title |
Phosphate Removal from Aqueous Solution according to Activation Methods of Red Mud |
| Authors |
김이태 ( I Tae Kim ) ; 배우근 ( Woo Keun Bae ) ; 김우정 ( Woo Jeong Kim ) |
| Keywords |
Activation of red mud; Phosphate; Removal |
| Abstract |
Red mud is formed as a waste during bauxite refining known as Bayer`s process. Its main constituents are iron, aluminium, sodium and silica. The disposal of large quantities of wasted red mud causes a serious ecological problem. In this study, the red mud wasted from the bauxite refinery was studied for phosphate removal from aqueous solution according to activation methods. The influence of heat treatment, and neutralization with sea water and acid treatment level for the optimum conditions for phosphate removal have been determined. Heat treatment combined with acid treatment is most suitable for the removal of phosphate from aqueous solution. The optimal condition was activated with 1N HCl solution after heating in 600℃ during 4 hours. Acid and heat treatment causes sodalite compounds which hinder the phosphate adsorption to leach out. The adsorption data obtained followed a first-order rate expression and fitted well with the Freundlich Isotherm well. |