高硫尾砂充填体强度变化规律实验研究

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英文篇名：Experimental Study on the Strength Variation Law of High-sulfur Tailings Backfill 作者：陈鑫政 ; 郭利杰 ; 史采星 ; 许文远 ; 李文臣 英文作者：Chen Xinzheng;Guo Lijie;Shi Caixing;Xu Wenyuan;Li Wenchen;BGRIMM Technology Group;National Center for International Joint Research on Green Metal Mining; 关键词：充填体 ; 高硫尾砂 ; 配比试验 ; 抗压强度 ; 扫描电镜 ; 钙矾石 英文关键词：Backfill;;High-sulfur tailings;;Proportioning test;;Compressive strength;;SEM;;Ettringite 中文刊名：金属矿山 英文刊名：Metal Mine 机构：北京矿冶科技集团有限公司;国家金属矿绿色开采国际联合研究中心; 出版日期：2019-04-15 出版单位：金属矿山 年：2019 期：04 基金：国家自然科学基金项目(编号:51774040);; 国家重点研发计划项目(编号:2016YFC0600709) 语种：中文; 页：17-20 页数：4 CN：34-1055/TD ISSN：1001-1250 分类号：TD853.34

摘要

国内某铜矿尾砂含硫偏高,为论证该矿山能否采用尾砂胶结充填,通过尾砂充填配比实验研究高硫尾砂充填体强度变化规律。结果表明:高硫尾砂充填体在不密闭条件下养护,随龄期的增长逐渐开裂,强度先增加后逐渐减小;在密闭环境下养护,充填体未出现开裂现象,强度随龄期的增长逐渐增加至相对稳定。在不密闭条件下养护,充填体前期强度随料浆质量浓度和灰砂比的变化呈规律性增加或减小,后期强度随灰砂比或质量浓度的变化无明显规律;扫描电镜分析显示高硫尾砂充填体开裂主要是因充填体内含有大量的钙矾石和石膏等膨胀性物质。
        In order to demonstrate whether tailings cemented filling with high sulfur content can be used in a copper mine in China,the strength variation of high-sulfur tailings filling body was investigated by adopting the tailings filling ratio experiment. The results showed that the high sulphur tailings filling body cracks gradually with the growth of curing age under unclosed environment,and its strength increases first and then decreases gradually. Under closed environment,the filling body does not crack,and its strength increases gradually to a relatively stable level with the growth of curing age. Under unclosed condition,the strength of filling body increases or decreases regularly with the change of slurry mass concentration and lime-sand ratio at the early stage,but it has no obvious variation law with the change of lime-sand ratio or mass concentration at the later stage. Scanning electron microscopy analysis shows that the cracking of high sulfur tailings filling body is mainly caused by the large amount of expansive materials such as ettringite and gypsum in the filling body.

引文

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