실리카계 물질에 의한 산화철 입자의 표면개질 = Surface Modification of Iron Oxide Particle by Silica - contained Meterials

다국어 초록 (Multilingual Abstract)

The surface modification of iron oxide particle produced from steel-pickled acid by sodium silicates as silica-contained materials was studied. The molar ratio of SiO₂ to Na₂O of sodium silicate was 1, 2, 3.5, respectively. The dispersion stability of iron oxide suspension as functions of amount of silica and pH was evaluated by surface charge and sedimentation velocity of iron oxide particle. Then, the amount of sodium silicate was determined to provide a dispersion stability of iron oxide particle above pH 7. Finally, the surface modification of iron oxide particle with sodium silicate as silica-contained materials was done by wet ball milling. In the results of study, the dispersion stability of silica modified iron oxide particle was largely depended on amount of silica and pH together. The untreated iron oxide was unstable at pH 8, i.e. isoelectric point, but, the surface modified iron oxide particle with 0.8wt% silica was stable above pH 5. The dispersion stability was enhanced with 0.2wt% of anionic polyelectrolyte.