摘要
为了探究酸性腐蚀对全尾砂胶结充填体物理力学性质的影响,采用工业浓硫酸分别配置pH为1,3,5的酸性溶液,将全尾砂胶结充填体放入酸性溶液中进行浸泡腐蚀,测试腐蚀后全尾砂胶结充填体的质量、纵波波速及抗压强度。结果表明:受酸性溶液腐蚀的影响,全尾砂胶结充填体抗压强度先增大后减小,在pH为1时充填体达到强度最大值的时间比pH为3,5时早;质量变化率在前30d出现先增大后减小再增大周期性变化,在30~60d阶段,pH为1时充填体质量变化率缓慢减小,腐蚀程度不断在增加;pH为3,5时充填体质量变化率则是减少后再增大;pH为3,5时纵波波速变化率在前30d快速增长,后30d增长缓慢,60d时变化率分别为16.63%、15.72%;pH为1时纵波波速变化率在前40d不断增加,并在40d达到最大值12.8%,随后开始急剧降低。
In order to explore the impact of acid corrosion on the physical and mechanical properties of the full tailings cemented backfill, industrial concentrated sulfuric acid was used to respectively prepare acidic solution with pH values of 1, 3, 5. The full railings cemented backfill were immersed in acid solution for corrosion, and then the mass, longitudinal wave velocity and the compressive strength of the full tailings cemented backfill were tested after corrosion. The results showed that, due to the cor- rosion of acidic solution, the compressive strength of the full tailings cemented backfill increased firstly and then decreased. The time that the filling body reached to the maximum strength in pH = 1 was earlier than that in pH values of 3, 5. The mass change rate showed a periodicity from increase, decrease and then increase in previous 30 days. In the stage of 30-60 days, with the pH value of 1, the mass change rate of the filling body decreased slowly and the corrosion rate increased. With the pH values of 3, 5, the mass change rate of the filling body decreased and then increased gradually. With the pH values of 3, 5, the longitudinal wave velocity rate rapidly grew in the first 30 days, and slowly grew in the 30-60 days, and the change rates were 16.63% and 15.72% on the 60th day. With the pH value of 1, the longitudinal wave velocity rate was increased continuously in the previous 40 days, and reached the maximum of 12.8% on the 40th day, and then began to decline sharply.
出处
《矿业研究与开发》
CAS
北大核心
2018年第3期91-94,共4页
Mining Research and Development
关键词
酸性腐蚀
全尾砂胶结充填体
质量变化率
纵波波速
抗压强度
Acidic corrosion, Full tailings cemented backfill, The mass change rate, Longitudinal wave velocity, Compressive strength
