摘要
尾砂胶结排放技术作为尾砂处置利用的一种新形式,主要应用在干旱少雨的地方,充填体长时间暴露于高温环境中,围绕这一特点,针对尾砂胶结充填体开展了多尺度温度-强度耦合特性研究。研究结果表明:水化反应早期,高温养护能够促进胶凝材料水化反应,从而提高充填体强度,但对充填体后期强度会造成负面影响;高温养护对充填体早期和后期的水化产物量呈现出不同的影响,但并不会影响水化产物的种类。水化产物的增加会使得充填体的结构更致密、颗粒之间的联结更为牢靠,细观上表现为SEM图像呈现出的结构更为紧凑,宏观上则表现为强度的提升和孔隙率的降低。
As a new form of tailings disposal and utilization,cemented tailings discharge technology is mainly applied in arid and rainless places,and the backfill body is exposed to a high-temperature environment for a long time.Based on this characteristic,this paper carried out research on the multi-scale temperature-strength coupling char acter-istics of cemented tailings backfill bodies.The results show that in the early stage of the hydration reaction,high-temperature curing can promote the hydration reaction of cementitious materials,thus improving the strength of the backfill body,but it will have a negative impact on the strength of the backfill body in the later stage;high-temperature curing has different effects on the amount of hydration products in the early and late stages of backfill body,but it does not affect the type of hydration products.The increase of hydration products will make the structure of the backfill body denser and the connection between particles become more solid,which is manifested as a more compact structure in SEM images on the micro level while on the macro level an increase in strength and a decrease in porosity.
作者
李智
郭勤强
杨勇
潘一硕
金克飞
林佶鹏
Li Zhi;Guo Qinqiang;Yang Yong;Pan Yishuo;Jin Kefei;Lin Jipeng(No.1 Institute of Geological&Mineral Resources Survey of Henan;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing)
出处
《黄金》
CAS
2023年第12期5-9,13,共6页
Gold
基金
国家自然科学基金项目(51674263)。
关键词
尾砂胶结排放
温度-强度耦合特性
力学性能
水化产物
孔隙率
细观形态
cemented tailings discharge
temperature-strength coupling characteristics
mechanical property
hydration products
porosity
micromorphology
