摘要
镍渣提铁尾渣(FETNS)是冶金废渣镍铁渣(FNS)经提铁处理后的二次尾渣.通过等温传导量热法测试FETNS-水泥复合胶凝体系的水化热,利用Krstulovic-Dabic模型构建水化动力学模型.通过宏观和微观两种手段探究复合胶凝体系的基本性能、反应产物和元素溶出.结果表明,该水化动力学模型可以准确地反映FETNS对水化反应的影响,FETNS的掺入降低了水化过程中晶体成核与生长、相界面反应和扩散三个阶段的反应速率和反应程度.FETNS的掺入降低了活性元素的溶出,推迟了复合胶凝体系的凝结,抑制了水化反应产物的生成,增大了体系内部结构的有害孔含量,大幅降低了早期抗压强度.
Ferrous extraction tailing of nickel slag(FETNS)is the secondary tailings of ferronickel slag(FNS)after ferrous extraction treatment.This paper tests the hydration heat of the FETNS-original portland cement composite binder system using isothermal conductive calorimetry and constructs a hydration kinetics model using the Krstulovic-Dabic model.Both macroscopic and microscopic methods are employed to investigate the basic properties,reaction products,and element leaching of the composite binder system.The results indicate that the hydration kinetics model can accurately reflect the impact of FETNS on the hydration reaction.The incorporation of FETNS reduces the reaction rates and extent of crystal nucleation and growth,phase interface reactions,and diffusion during the hydration process.The addition of FETNS decreases the leaching of reactive elements,delays the setting of the composite binder system,inhibits the formation of hydration reaction products,increases the content of harmful pores in the system’s internal structure,and significantly reduces the early compressive strength.
作者
宋彦宁
乔宏霞
冯琼
魏超
郑江华
SONG Yanning;QIAO Hongxia;FENG Qiong;WEI Chao;ZHENG Jianghua(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Advanced Civil Engineering Materials Engineering Research Center,Lanzhou 730050,China;State Key Laboratory of Ni&Co Associated Minerals Resources Development and Comprehensive Utlization,Jinchang 737102,China)
出处
《湖南大学学报(自然科学版)》
北大核心
2025年第9期199-210,共12页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(52178216,52468036)
甘肃省科技计划资助项目(23JRRA799,24JRRA213)。
关键词
镍渣提铁尾渣
废物管理
水化反应
水泥
力学性能
ferrous extraction tailing of nickel slag
waste management
hydration reaction
cement
mechanical properties
