铜渣基铁系草酸盐水泥热稳定性研究  

Performance of copper slag based ferrous oxalate cement after exposure to elevated temperatures

作　　者：田鑫聪 杜新[2] 何欢[1] 周新涛[1] 罗中秋[1] TIAN Xincong;DU Xin;HE Huan;ZHOU Xintao;LUO Zhongqiu(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,P.R.China;Sichuan Metallurgical Geological Exploration Institute,Chengdu 610051,P.R.China)

机构地区：[1]昆明理工大学化学工程学院,昆明650500 [2]四川省冶金地质勘查院,成都610051

出　　处：《重庆大学学报》2025年第2期102-109,共8页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(22366023);昆明理工大学分析测试基金资助项目(2023T20130126)。

摘　　要：基于铜渣基铁系草酸盐水泥具有快凝、早强等特性,在高温窑炉修补和核废物固化等领域具有潜在的应用前景。在前期铜渣基铁系草酸盐水泥基础性能研究的基础上,系统考察了其在150~1000℃热处理条件下性能、物相及结构的演变。结果表明,自然养护28 d时,铜渣基铁系草酸盐水泥抗压强度达55.1 MPa,其物相主要由反应新生成的FeC_(2)O_(4)·2H_(2)O和未完全反应的铁橄榄石相Fe_(2)SiO_(4)组成。经不同温度热处理后,力学性能及结构发生规律性变化。当热处理温度高于250℃时,生成的胶凝相物质FeC_(2)O_(4)·2H_(2)O开始热分解,材料结构发生破坏,力学性能下降,至1000℃时,抗压强度趋于稳定,约为15 MPa。由此可见,铜渣基铁系草酸盐水泥在高温下仍可保持较高的力学性能,具有较好的热稳定性。Copper slag based ferrous oxalate cement(CS-FOC)exhibits significant potential for applications in high temperature kiln repair and nuclear waste stabilization/solidification,owing to its rapid setting properties and high early-age strength.This study comprehensively investigates the evolution of properties,phase compositions,and structure of CS-FOC following exposure to elevated temperatures(150~1000℃),building on prior research.The results show that CS-FOC achieves a compressive strength of 55.1 MPa after 28 days of natural curing,primarily composed of newly-formed ferrous oxalate dihydrate(FeC_(2)O_(4)·2H_(2)O)and unreacted fayalite(Fe_(2)SiO_(4)).Exposure to elevated temperatures induces regular changes in both the compressive strength and structural integrity of CSFOC.At temperatures exceeding 250℃,FeC_(2)O_(4)·2H_(2)O decomposes into iron oxide,leading to structural degradation and a consequent reduction in strength.Despite this,the material maintains a stable compressive strength of about 15 MPa after exposure to temperatures as high as 1000℃.These findings highlight the superior thermal stability of CS-FOC,alongside its ability to retain a relatively high compressive strength under extreme thermal conditions.

关 键 词：铜渣 铁系草酸盐水泥 热稳定性 抗压强度 

分 类 号：TU528[建筑科学—建筑技术科学]