海因环氧树脂复合黏土-尾矿砂固化体强度特性及微观机制  

Strength characteristics and micro-mechanism of hydantoin epoxy resin composite clay tailings sand solidified body

作　　者：贺勇[1,2] 蒋文强 陈科平 吴练荣[3] 张可能 甘雪萍[4] HE Yong;JIANG Wen-qiang;CHEN Ke-ping;WU Lian-rong;ZHANG Ke-neng;GAN Xue-ping(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,Central South University,Changsha 410083,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Yunnan Diqing Nonferrous Metal Co.,Ltd.,Shangri-La 674400,China;School of Powder Metallurgy Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083 [2]中南大学地球科学与信息物理学院,长沙410083 [3]云南迪庆有色金属有限责任公司,香格里拉674400 [4]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2022年第11期3528-3540,共13页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(42072318,41972282,41807253);湖南省自然科学基金资助项目(2021JJ30804);中国科学院环境地球化学国家重点实验室开放课题(SKLEG2021208);云南迪庆有色金属有限责任公司科研项目(DQYSZYB-09-(2021)001)。

摘　　要：采用海因环氧树脂复合黏土固化处理尾矿砂,基于无侧限抗压强度、干湿循环和微观试验,研究海因环氧树脂和红黏土掺量以及干湿循环次数对固化体强度特性的影响规律。结果表明:固化体强度随海因环氧树脂掺量的增加而增大,随红黏土掺量的增加先增大后减小;两者存在最优掺入比,海因环氧树脂掺量为10%,红黏土掺量为5%时,固化体强度为8.25 MPa。固化体的抗压强度随着干湿循环次数的增加而减小,7次干湿循环后,固化体强度降幅均超过了80%。红黏土掺量从0%增加至5%时,固化体中形成“粒状-镶嵌-胶结”结构,胶结程度显著增强;红黏土掺量从5%增加至30%时,固化体中的团聚体松散度增加,生成的胶结物分散不均,导致出现较多孔隙。The hydantoin epoxy resins composite red clay was used to solidify the tailings,based on unconfined compressive strength tests,cyclic drying-wetting tests and microscopic tests,the effects of the content of hydantoin epoxy resin and red clay and drying-wetting cycles on the strength characteristics of the solidified body were studied in this work.The results show that the strength of solidified body increases with the increase of the hydantoin epoxy resin content,and first increases and then decreases with the increase of red clay content.An optimal mixing ratio is found that,when the content of hydantoin epoxy resin is 10%and the content of red clay is 5%,the strength of the cured body is 8.25 MPa.The compressive strength of the solidified body decreases with the increase of the number of drying-wetting cycles.After 7 drying-wetting cycles,the strength of solidified body decreases by more than 80%.When the content of red clay increases from 0%to 5%,a strong structural connection is formed in the solidified body,forming a"granular mosaic cementation"structure,and the degree of cementation is strengthened.When the content of red clay increases from 5%to 30%,the dispersion of aggregates in the solidified body increases,and the generated cement is unevenly dispersed,resulting in a large number of pores.

关 键 词：海因环氧树脂 尾矿砂 黏土 强度特性 微观机制 资源化利用 

分 类 号：P66[天文地球—地质学]