铜渣基磷酸盐胶凝材料的力学性能与微观结构

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (5): 1750-1757.

所属专题：资源综合利用

铜渣基磷酸盐胶凝材料的力学性能与微观结构

薛兴勇^1,2, 韩要丛^1,2, 苏俏俏^1,2, 徐梦雪³, 崔学民⁴

1.广西民族大学化学化工学院广西多糖材料与改性重点实验室,南宁 530006;
2.广西民族大学化学化工学院广西高校化学与生物转化过程新技术重点实验室,南宁 530006;
3.广西科学院,南宁 530007;
4.广西大学化学化工学院,南宁 530004

收稿日期:2023-01-28 修订日期:2023-03-01 出版日期:2023-05-15 发布日期:2023-06-01
通信作者: 韩要丛,博士,讲师。E-mail:yc-han@163.com
作者简介:薛兴勇(1985—),男,博士。主要从事新型无机胶凝材料的研究。E-mail:315254042@qq.com
基金资助:
广西民族大学科研基金引进人才科研启动项目(2020KJQD15);2022年度广西高校中青年教师科研基础能力提升项目(2022KY0160);广西自然科学基金(2021GXNSFBA196065)

Mechanical Properties and Microstructure of Copper Slag-Based Phosphate Cementitious Materials

XUE Xingyong^1,2, HAN Yaocong^1,2, SU Qiaoqiao^1,2, XU Mengxue³, CUI Xuemin⁴

1. Guangxi Key Laboratory for Polysaccharide Materials and Modification, School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530006, China;
2. Guangxi Higher Education Institutes Key Laboratory for New Chemical and Biological Transformation Process Technology,School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530006, China;
3. Guangxi Academy of Science, Nanning 530007, China;
4. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

Received:2023-01-28 Revised:2023-03-01 Online:2023-05-15 Published:2023-06-01

摘要/Abstract

摘要： 磷酸盐胶凝材料力学性能好,制备工艺简单,为资源化利用铜渣提供了新的途径。本文以铜渣和磷酸二氢钠(NaH₂PO₄)为原料制备了磷酸盐胶凝材料,采用电子万能试验机、X射线粉末衍射仪及扫描电子显微镜研究了原料配合比和养护条件对铜渣基磷酸盐胶凝材料抗压强度、物相和微观形貌的影响,并采用同步热分析仪考察了磷酸盐胶凝材料的热稳定性。结果表明,原料配合比对磷酸盐胶凝材料的力学性能和微观结构有重要影响,适当提高养护温度有利于强度发展。当NaH₂PO₄/铜渣质量比为0.30、水/(NaH₂PO₄+铜渣)质量比为0.15、60 ℃下养护7 d时,铜渣基磷酸盐胶凝材料抗压强度高达54.70 MPa。铜渣基磷酸盐胶凝材料优异的力学性能源自铜渣中铁橄榄石(Fe₂SiO₄)与NaH₂PO₄反应生成的致密无定形结构相。铜渣基磷酸盐胶凝材料热稳定性较好,空气气氛下467 ℃开始被氧化分解,无定形结构相发生相转变。

关键词: 磷酸盐胶凝材料, 铜渣, 磷酸二氢钠, 力学性能, 微观结构, 热稳定性

Abstract: Phosphate cementitious materials have good mechanical properties, and simple preparation process, which provide a new way for resource utilization of copper slag. Phosphate cementitious materials were prepared using copper slag and sodium dihydrogen phosphate (NaH₂PO₄) as raw materials. And the effects of raw material mix ratio and curing conditions on compressive strength, phase and microstructure of copper slag-based phosphate cementitious materials were studied by universal testing machine, X-ray powder diffractometer and scanning electron microscope. Besides, the thermal stability of copper slag-based phosphate cementitious materials was also investigated by simultaneous thermal analyzer. The results show that raw material mix ratio has an important influence on mechanical properties and microstructure of phosphate cementitious materials. And appropriately increasing the curing temperature is conducive to strength development. When the mass ratio of NaH₂PO₄ to copper slag is 0.30, the mass ratio of water to NaH₂PO₄ and copper slag is 0.15, and the curing temperature is 60 ℃, the 7 d compressive strength of copper slag-based phosphate cementitious materials is as high as 54.70 MPa. The excellent mechanical properties are due to the dense amorphous phase formed by the reaction of fayalite (Fe₂SiO₄) in copper slag with NaH₂PO₄. Furthermore, the copper slag-based phosphate cementitious materials have good thermal stability. It begins to be oxidized and decomposed at 467 ℃ under air atmosphere, and the amorphous structure phase undergoes phase transition.

Key words: phosphate cementitious material, copper slag, NaH₂PO₄, mechanical property, microstructure, thermal stability

中图分类号:

TQ177

薛兴勇, 韩要丛, 苏俏俏, 徐梦雪, 崔学民. 铜渣基磷酸盐胶凝材料的力学性能与微观结构[J]. 硅酸盐通报, 2023, 42(5): 1750-1757.

XUE Xingyong, HAN Yaocong, SU Qiaoqiao, XU Mengxue, CUI Xuemin. Mechanical Properties and Microstructure of Copper Slag-Based Phosphate Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1750-1757.

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铜渣基磷酸盐胶凝材料的力学性能与微观结构

Mechanical Properties and Microstructure of Copper Slag-Based Phosphate Cementitious Materials

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