摘要
铀尾矿水泥固化过程中,经常会遇到混合不均匀而导致强度较低、氡析出率高等问题。为了改善固化体的性能,在固化体中掺入一些其他固化材料,例如粒化高炉矿渣、粉煤灰和生石灰等。通过调整固化体中掺合料的种类、掺量和养护龄期,测试铀尾矿水泥固化体的饱和含水率、力学强度和氡析出率等性能。实验结果表明:单掺粒化高炉矿渣、粉煤灰和生石灰时,铀尾矿固化体7 d、14 d和28 d龄期抗压强度、抗拉强度和抗剪强度均有所提高;从力学性能考虑,效果最好的是养护28 d掺量为25%粒化高炉矿渣固化体,其饱和含水率也最低;掺量越大氡析出率越低,但是效果最好的是掺入25%的粒化高炉矿渣,其次是掺入25%的粉煤灰。该研究成果可为今后铀尾矿库退役治理提供理论参考和决策依据。
In the process of cement solidification of uranium tailings, uneven mixing often leads to low strength and high radon exhalation rate. In order to improve the properties of the solidified body, some other solidified materials such as granulated blast furnace slag, fly ash and quicklime were added into the solidified body. The saturated water content, mechanical strength and radon exhalation rate of uranium tailings cement solidified body were tested by adjusting the type, dosage and curing age of the admixtures in the solidified body. The experimental results showed that the compressive strength, tensile strength and shear strength of uranium tailings solidified body at 7 d, 14 d and 28 d ages are improved with the separate addition of granulated blast furnace slag, fly ash and quicklime. According to the mechanical properties, it is the best to maintain the solidified body with 25% granulated blast furnace slag at 28 d, with lowest saturated water content;The higher the content of radon, the lower the radon exhalation rate, but the best performance is obtained by the addition of 25% granulated blast furnace slag, followed by 25% fly ash. The research results can provide theoretical reference and decision-making basis for the decommissioning treatment of uranium tailings reservoir in the future.
作者
蒋复量
王小丽
黎明
刘永
李向阳
陈冠
郭锦涛
Jiang Fuliang;Wang Xiaoli;Li Ming;Liu Yong;Li Xiangyang;Chen Guan;Guo Jintao(School of Resource & Environment and Safety Engineering,University of South China,Hengyang 421001,China;Hunan Province Engineering Technology Research Center of Uranium Tailings Treatment Technology,Hengyang 421001,China;Hunan Province Engineering Research Center of Radioactive Control Technology in Uranium Mining,Hengyang 421001,China)
出处
《金属矿山》
CAS
北大核心
2019年第4期41-47,共7页
Metal Mine
基金
国家自然科学基金面上项目(编号:11475081
11875164)
湖南省教育厅优秀青年项目(编号:17B228)
铀矿冶放射性控制技术湖南省工程研究中心
湖南省铀尾矿库退役治理工程技术研究中心联合开放课题(编号:2018YKZX1004)
2018年南华大学研究生科学基金项目(编号:2018KYY130)
关键词
铀尾矿
水泥固化体
力学强度
饱和含水率
氡析出率
Uranium tailings
Cement solidification
Mechanical property
Saturated water content
Radon exhalation rate
