全尾砂膏体充填早期强度提升措施及微观机理分析  

Early strength enhancement measures and microscopicmechanism analysis of ungraded tailings paste filling

作　　者：朱安 邱贤阳[2] Zhu An;Qiu Xianyang(Wuning County Natural Resources Bureau;School of Resources and Safety Engineering,Central South University)

机构地区：[1]武宁县自然资源局 [2]中南大学资源与安全工程学院

出　　处：《黄金》2024年第1期1-5,共5页Gold

基　　金：“十四五”国家重点研发计划项目(2022YFC2904602);广西壮族自治区重点研发计划项目(2022AB3102)。

摘　　要：为提升膏体充填早期强度,并探索影响充填体早期强度的微观机理,以某矿山为工程背景,分别对添加粗骨料碎石技术方案与采用自主研发的新型胶凝材料技术方案进行了配比试验。试验结果表明:添加粗骨料碎石技术方案大部分工况条件下能够满足矿山28 d强度≥5 MPa的要求,但若要满足3 d强度≥2.5 MPa的要求,则需要添加40%以上粗骨料碎石,且保证浓度74%以上,灰砂比1∶4以上。而采用新型胶凝材料作为胶结剂的技术方案,在浓度72%以上,基本都能够满足3 d强度≥2.5 MPa和28 d强度≥5 MPa的要求。对采用新型胶凝材料的试块进行扫描电子显微镜扫描,发现新型胶凝材料有利于充填体内部钙矾石晶体的发育,对提升充填体早期强度效果明显。试验结论及相关技术参数能够为该矿山未来充填系统建设提供技术支撑。In order to improve the early strength of paste filling and explore the microscopic mechanism affecting the early strength of the filling body,ratio experiments were conducted with a certain mine as the engineering back-ground on the technical schemes,that is adding coarse aggregate gravel and adopting an independently developed new cementitious material,respectively.The test results showed that the scheme of adding coarse aggregate gravel could meet the technical requirements of 28 d strength≥5 MPa under most working conditions.However,to meet the requirement of 3 d strength≥2.5 MPa,it is necessary to add more than 40%coarse aggregate gravel,and ensure a concentration of more than 74%and a cement-sand ratio of 1∶4 or more.On the other hand,the technical scheme using the new cementitious material as a binder could generally meet the technical requirements of 3 d strength≥2.5 MPa and 28 d strength≥5 MPa with a concentration of 72%or above.Scanning electron microscopy(SEM)analysis of the test blocks using the new cementitious material revealed that it promoted the development of calcium aluminate crystals inside the filling body,thereby significantly enhancing the early strength.The conclusions and rele-vant technical parameters of the experiments can provide technical support for future filling system construction in the mine.

关 键 词：全尾砂 膏体充填 早期强度 新型胶凝材料 微观机理 

分 类 号：TD853.34[矿业工程—金属矿开采]