以煤矸石亚熔盐法提铝尾渣为原料,采用水热法脱钠制备介孔硅酸钙。考察了碱浓度、液固比、反应温度和反应时间对终渣氧化钠含量和介孔硅酸钙生成的影响。对提铝尾渣水热反应前后分别做XRF、XRD、SEM和BET分析,结果表明：在反应温度为190 ℃、碱质量浓度为30 g/L、液固质量比为8时,尾渣氧化钠质量分数可由反应前的19.28%降至0.92%,物相由反应前的硅酸钠钙（NaCaHSiO₄）转化为水化硅酸钙[Ca₅（OH）₂Si₆O₁₆·4H₂O],其孔径主要分布在2~20 nm。反应符合化学反应过程控制,表观活化能为23.11 kJ/mol。

Mesoporous calcium silicate was prepared by hydrothermal method using alumina-extracted coal gangue by sub-molten salt as raw material.The effects of NaOH concentration,liquid-solid ratio,reaction temperature and reaction time on content of Na₂O in final residue and formation of calcium silicate were studied.The properties of the residues before and after reaction were characterized through XRF、XRD、SEM and BET.Result indicated that the tailing Na₂O mass fraction decreased from 19.28% to 0.92% and the main phase transformed from NaCaHSiO₄ to Ca₅（OH）₂Si₆O₁₆·4H₂O under optimal conditions as follow：reaction temperature of 190 ℃,NaOH mass concentration of 30 g/L and liquid-solid mass ratio of 8.Result sho-wed that the pore size distribution of the calcium silicate ranged from 2 nm to 20 nm.The formation reaction of calcium silicate,with apparent activation energy of 23.11 kJ/mol,was controlled by the chemical reaction in the initial reaction pro-cess.