(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)
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。
关键字: 海因环氧树脂；尾矿砂；黏土；强度特性；微观机制；资源化利用
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Yunnan Diqing Nonferrous Metal Co., Ltd., Shangri-La 674400, China;
4. School of Powder Metallurgy Research Institute, Central South University, Changsha 410083, China）
Abstract: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.
Key words: hydantoin epoxy resin; tailings sand; clay; strength characteristics; micro-mechanism; resource utilization
