有机酸调控硫氧镁水泥的水化进程  

Organic Acids Modulate the Hydration Process of Magnesium Sulphide Cements

作　　者：马宏宇 姬仁林 马亚丽 郑强 贾松岩 李雪 MA Hongyu;JI Renlin;MA Yali;ZHENG Qiang;JIA Sorgyan;LI Xue(College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Liaoning Engineering Research Center of Inorganic Functional Materials for Magnesium and Calcium Resourees.Shenyang 110142,China;Shenyang Key Laboratory for the Utilization Technology of Magnesium and Calcium Resources,Shenyang 110142,China)

机构地区：[1]沈阳化工大学化学工程学院,沈阳110142 [2]辽宁省镁钙资源无机功能材料工程研究中心,沈阳110142 [3]沈阳市镁钙资源利用技术重点实验室,沈阳110142

出　　处：《硅酸盐学报》2025年第2期396-405,共10页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2020YFC1909302)。

摘　　要：高活性氧化镁(Mg O)为原料制备硫氧镁水泥(MOSC)时迅速发生水化反应,生成大量Mg(OH)_(2),导致MOSC的凝结时间过短,抗压强度较低。本工作采用一系列有机酸和高活性Mg O制备MOSC。探讨了有机酸对Mg O水化进程、MOSC的凝结时间、抗压强度、物相组成、微观形貌、孔结构、水化放热温度等因素的影响。结果表明:酒石酸能有效抑制MgO的水化进程;45℃时加入3%(质量分数)酒石酸对MgO的水化进程的抑制效果良好,Mg O的水化率由58.7%降低到19.2%。采用活性含量为85%的MgO制备MOSC,加入酒石酸能有效延长浆体的初凝与终凝时间、抑制Mg(OH)_(2)的生成、促进5·1·7相的形成,制备的MOSC的7 d和28 d抗压强度较无酒石酸时分别提高111.4%和83.9%。Introduction Magnesium sulfide oxide cement(MOSC)is an air-hardening cementing material,which is produced by the reaction of light calcined MgO with a certain concentration of MgSO_4 aqueous solution.Light calcined MgO raw materials have large differences in the aspect of MgO activity due to different calcination processes,and the MgO activity has a large impact on the performance of MOSC.For the preparation of MOSC,the increased MgO activity usually accelerates the hydration reaction speed of cement paste,leading to the increased exothermic amplitude of the system and the accelerated growth of Mg(OH)_(2)crystals in MOSC.As such,the process of condensation and hardening of MOSC is accelerated,which is unfavorable to the growth of the 5·1·7 phase,leading to an inferior compressive strength of MOSC.Therefore,efficiently inhibiting the hydration process of high-activity MgO plays a crucial role in the preparation of high-performance MOSC.In this work,a series of organic acids and high-activity MgO were used to prepare MOSC.The effects of organic acids on the hydration process of high-activity MgO,the setting time,the compressive strength,the phase composition,the micro-morphology,the pore structure,and the exothermic temperature of hydration of MOSC were investigated in detail.Methods The high-activity MgO powder from Hebei Magnesium Sheng Chemical Technology Co.,Ltd.was used,and the content of active MgO was 85%as determined by the hydration method,with an average particle size of 20.82μm and a specific surface area of 47.45 m~2/g.The MgSO_4·7H_(2)O was of industrial grade with a purity of 99%,and the citric,tartaric,oxalic,lactic,salicylic,lauric,and stearic acids were all analytically pure,purchased from Tianjin Hengxing Ltd.Hydration experiments of high-activity MgO:The hydration reaction was carried out under the conditions involving the temperatures of 45,60,75,90℃,the reaction times of 0.5,1.0,1.5 h and 2.0 h,and stirring rate of 300 r/min,with a fixed solid-liquid ratio(m_(MgO):m_(H2O))of 1:10.The addi

关 键 词：高活性氧化镁 水化进程 水化率 硫氧镁水泥 抗压强度 

分 类 号：TQ172.1[化学工程—水泥工业]