(1. 中南大學(xué) 有色金屬成礦預(yù)測與地質(zhì)環(huán)境監(jiān)測教育部重點實驗室，長沙 410083；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083；
3. 云南迪慶有色金屬有限責(zé)任公司，香格里拉 674400；
4. 中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 采用海因環(huán)氧樹脂復(fù)合黏土固化處理尾礦砂，基于無側(cè)限抗壓強(qiáng)度、干濕循環(huán)和微觀試驗，研究海因環(huán)氧樹脂和紅黏土摻量以及干濕循環(huán)次數(shù)對固化體強(qiáng)度特性的影響規(guī)律。結(jié)果表明：固化體強(qiáng)度隨海因環(huán)氧樹脂摻量的增加而增大，隨紅黏土摻量的增加先增大后減小；兩者存在最優(yōu)摻入比，海因環(huán)氧樹脂摻量為10%，紅黏土摻量為5%時，固化體強(qiáng)度為8.25 MPa。固化體的抗壓強(qiáng)度隨著干濕循環(huán)次數(shù)的增加而減小，7次干濕循環(huán)后，固化體強(qiáng)度降幅均超過了80%。紅黏土摻量從0%增加至5%時，固化體中形成“粒狀-鑲嵌-膠結(jié)”結(jié)構(gòu)，膠結(jié)程度顯著增強(qiáng)；紅黏土摻量從5%增加至30%時，固化體中的團(tuán)聚體松散度增加，生成的膠結(jié)物分散不均，導(dǎo)致出現(xiàn)較多孔隙。
關(guān)鍵字: 海因環(huán)氧樹脂；尾礦砂；黏土；強(qiáng)度特性；微觀機(jī)制；資源化利用
（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
