采用碱介质湿法处理高铁赤泥,脱除赤泥中钠硅渣并使其中的氧化铁在渣相中富集.考察了反应温度、反应时间、初始溶液Na2O浓度、苛性比(Na2O与Al2O3的摩尔比)及液固比等对终渣化学组成及物相的影响.结果表明,在250℃、初始溶液Na2O浓度530 g/L、苛性比15、液固比6 mL/g、反应30 min的条件下,赤泥终渣Fe2O3含量由33.56%提高到46.27%,Na2O含量由4.99%降至0.87%.经碱介质处理后赤泥的主要物相由方钠石和钙铁榴石转化为较单一物相钙铁榴石. The red mud of high-speed railway was treated wet by alkaline medium, the sodium-silicon slag was removed and the iron oxide was enriched in the slag phase.The reaction temperature, Molar ratio) and liquid-solid ratio on the chemical composition and phase of the final residue.The results showed that the initial solution Na2O concentration 530 g / L, caustic ratio 15, liquid-solid ratio 6 mL / g, reaction time 30 min, the content of Fe2O3 in final red mud increased from 33.56% to 46.27% and the content of Na2O decreased from 4.99% to 0.87% .The main phase of red mud was converted from sodalite and dicalcium to More than a single phase of the same.