煤气化渣替代矿渣制备超硫酸盐水泥的可行性研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (8): 2952-2960.

煤气化渣替代矿渣制备超硫酸盐水泥的可行性研究

窦占双¹, 魏力², 王梦梦¹, 王冲³, 贾小龙^1,3, 门光誉¹, 李瑞杰²

1.宁夏交通建设股份有限公司,银川 750004;
2.宁夏公路管理中心,银川 750004;
3.重庆大学材料科学与工程学院,重庆 400044

收稿日期:2024-01-03 修订日期:2024-04-07 出版日期:2024-08-15 发布日期:2024-08-12
通信作者: 贾小龙,工程师。E-mail:1415352949@qq.com
作者简介:窦占双(1981—),男,高级工程师。主要从事道路新材料方向的相关研发工作。E-mail:87024180@qq.com
基金资助:
交通运输行业重点科技项目(2022-MS5-129);宁夏回族自治区交通运输厅交通科技项目(202300193);宁夏回族自治区重点研发计划项目(2023BDE02004)

Feasibility Study on Using Coal Gasification Slag as a Substitute for Blast Furnace Slag to Prepare Super Sulphated Cement

DOU Zhanshuang¹, WEI Li², WANG Mengmeng¹, WANG Chong³, JIA Xiaolong^1,3, MEN Guangyu¹, LI Ruijie²

1. Ningxia Communications Construction Co., Ltd., Yinchuan 750004, China;
2. Ningxia Highway Administration Center, Yinchuan 750004, China;
3. School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Received:2024-01-03 Revised:2024-04-07 Online:2024-08-15 Published:2024-08-12

摘要/Abstract

摘要： 煤气化渣(CGS)富含硅、铝元素,具备作为胶凝材料前体的潜力,但其颗粒形态粗糙,活性较低。为了解决CGS活性低、利用难等问题,利用CGS部分替代矿渣(BFS),探究CGS替代BFS制备超硫酸盐水泥(SSC)的技术可行性,并借助傅里叶红外光谱、X射线衍射仪、热重分析仪、扫描电子显微镜及能谱仪等微观测试技术对SSC水化产物的微观结构进行表征分析。结果表明,CGS作为制备SSC的原料,能提供初始水化所需要的硅、铝元素,驱动SSC发生水化反应。随着CGS掺量的增加,SSC胶砂的抗压强度呈逐渐减小趋势,而抗折强度受影响较小。CGS的最佳掺量为20%(质量分数),在此掺量下胶砂试样的28 d抗折强度最大,抗压强度也达到43.9 MPa。SSC的水化产物主要是水化硅酸钙、水化硫铝酸钙等凝胶。研究结果显示CGS部分替代BFS完全可用于制备SSC。

关键词: 煤气化渣, 矿渣, 超硫酸盐水泥, 胶凝材料, 力学性能, 微观结构

Abstract: Coal gasification slag (CGS) is rich in silicon and aluminum elements, which has the potential to be used as a precursor of cementitious materials. However, the particle morphology of CGS is rough and the activity is low. In this study, in order to solve the issues of low activity and difficult utilization of CGS, the technical feasibility of using CGS as a partial substitute for blast furnace slag (BFS) in the preparation of SSC was explored. The microstructure of the hydrated products of SSC was characterized and analyzed using Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, energy dispersive spectrometry and other microscopic testing techniques. The results show that CGS as a raw material for the preparation of SSC, can provide the silicon and aluminum elements needed for initial hydration and drive the hydration reaction of SSC. With the increase of the dosage of CGS, the compressive strength of SSC sand shows a gradual decrease, while the effect on flexural strength is small. The optimum dosage of CGS is 20% (mass fraction), under this dosage, the 28 d flexural strength of cement sand specimen is the largest, and the compressive strength also reaches 43.9 MPa. The hydration products of SSC are mainly hydrated calcium silicate, hydrated calcium sulfoaluminate and other gels. The results show that CGS can be used to prepare SSC by partially replacing BFS.

Key words: coal gasification slag, blast furnace slag, super sulphated cement, cementitious material, mechanical property, microstructure

中图分类号:

TU525

窦占双, 魏力, 王梦梦, 王冲, 贾小龙, 门光誉, 李瑞杰. 煤气化渣替代矿渣制备超硫酸盐水泥的可行性研究[J]. 硅酸盐通报, 2024, 43(8): 2952-2960.

DOU Zhanshuang, WEI Li, WANG Mengmeng, WANG Chong, JIA Xiaolong, MEN Guangyu, LI Ruijie. Feasibility Study on Using Coal Gasification Slag as a Substitute for Blast Furnace Slag to Prepare Super Sulphated Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2952-2960.

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