摘要
以废弃物煤矸石为原料,首先采用湿法工艺提取SiO_(2)制备硅酸钠溶液,然后结合"多相复式非连续生产工艺"快速制备出疏水性SiO_(2)气凝胶,研究了不同体积取代率下(0、60%、70%、80%、90%、100%)水泥砂浆的物理和力学性能。结果表明:煤矸石中SiO_(2)产率高达92.2%,疏水性SiO_(2)气凝胶纯度可达98.96%,孔隙分布均匀,密度约为240 kg/m3;气凝胶水泥砂浆具有较小的导热系数和较好的疏水性,当气凝胶的取代率为100%时,导热系数达到0.127 W(/m·K)。本研究为煤矸石高效高附加值资源化利用指明了一条途径。
It is an innovative method to utilizing waste coal gangue as a raw material to prepare the hydrophobic SiO_(2) aerogel.Firstly,the sodium silicate solution was prepared by the wet processing from the waste coal gangue.And then the hydrophobic SiO_(2) aerogel was rapidly prepared by a"multiphase duplex non-continuous production process".In addition,the physical and mechanical properties of cement mortar prepared with different volumes(0,60%,70%,80%,90%,100%)of SiO_(2) aerogel substituting the fine aggregates in mortar were also studied.The results show that the yield of hydrophobic SiO_(2) aerogel in coal gangue is as high as 92.2%,and the purity of hydrophobic SiO_(2) aerogel can reach 98.96%.The aerogel has uniform pore distribution,and its density is around 240 kg/m3.The cement mortar with aerogel has lower thermal conductivity and better hydrophobicity compared to those without aerogel.When the volume substitution rate of aerogel is 100%,the thermal conductivity is only 0.127 W/(m·K).This study proposes a new way for the effective and high value-added utilization of coal gangue.
作者
朱平华
成程
刘惠
孙浩
陈培鑫
ZHU Pinghua;CHENG Cheng;LIU Hui;SUN Hao;CHEN Peixin(School of Environmental&Safety Engineering,Changzhou University,Changzhou 213164,China)
出处
《混凝土》
CAS
北大核心
2021年第4期104-108,共5页
Concrete
基金
国家自然科学基金(5167080943)。
