Mechanical properties and microstructure evolution of solidified copper tailings with hydantoin epoxy resin
(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 Metals Co., Ltd., Shangri-La 674400, China;
4. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Yunnan Diqing Nonferrous Metals Co., Ltd., Shangri-La 674400, China;
4. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
Abstract: Based on the strength and microstructure tests, the effects of the hydantoin epoxy resin content and curing time on the mechanical properties and microstructure of copper tailings specimens were studied. The results showed that the strength of the solidified specimens was increased to 20.84 MPa with 30 wt.% addition of hydantoin epoxy resin. When the specimens with 10% hydantoin epoxy resin were cured for 7 and 14 d, the strengths were 6.33 and 6.67 MPa respectively, which met the requirements as foundation filler and building materials. The microscopic tests showed that the agglomeration was enhanced and the porosities of the solidified specimens were reduced with increase in the hydantoin epoxy resin content, which could greatly enhance the strength of solidified specimens.
Key words: copper tailings; hydantoin epoxy resin; mechanical properties; microstructure