高炉矿渣基充填胶凝材料的制备与工业应用  

Preparation and industrial application of blast furnace slag based filling cementitious materials

作　　者：党志超 DANG Zhichao(Laiwu Iron and Steel Group Laiwu Mining Co.Ltd.,Jinan 271100,China)

机构地区：[1]莱芜钢铁集团莱芜矿业有限公司,济南271100

出　　处：《矿冶》2024年第1期21-25,共5页Mining And Metallurgy

摘　　要：以高炉矿渣、尾砂、水泥为原料,用氢氧化钠作为激发剂制备充填材料,研究了养护龄期和原料掺量对充填材料抗压强度的影响。结合工业应用实践要求,确定最佳原料和激发剂掺量,制备充填胶凝材料,并将制备的胶凝材料用于矿山充填采矿过程,研究所制备充填材料的应用可行性。结果表明,充填材料抗压强度随试件养护龄期的延长先快速上升后趋于平缓,推荐充填材料养护龄期在21d以上;随着砂灰比的增加,充填材料的抗压强度降低,建议最佳砂灰比为4;随着料浆质量浓度的增加,充填材料的抗压强度先缓慢升高,后快速升高,推荐最佳料浆质量浓度为62%~70%;随着高炉矿渣掺量的增加,充填材料的抗压强度先升高后趋于平缓,推荐高炉矿渣掺量为20%;随着激发剂氢氧化钠掺量的增加,充填材料的抗压强度先升高后降低,推荐激发剂氢氧化钠掺量为25%;在高炉掺量20%、砂灰比4、料浆质量浓度65%、氢氧化钠掺量25%的条件下制备充填材料并养护21d,养护后充填材料的抗压强度可满足采空区顶板厚度为30m、岩体容重为2.5t/m^(3)、重力载荷计算为0.75 MPa的载荷要求,充填结构稳定,满足强度要求。Using blast furnace slag,tailings,and cement as raw materials,sodium hydroxide was used as an activator to prepare filling materials.The effects of curing age and raw material content on the compressive strength of the tilling materials were studied.Based on the requirements of industrial application practice,the optimal amount of raw materials and activators to prepare tilling cementitious materials is determined,and the prepared cementitious materials in the mining tilling and mining process is used to study the feasibility of the application of the fling materials prepared by the institute.The results show that the compressive strength of the fling material increases rapidly and then tends to flatten with the extension of the curing age of the specimen.It is recommended that the curing age of the fling material be above 21 d.As the sand to cement ratio increases,the compressive strength of the fling material decreases.It is recommended to have an optimal sand to cement ratio of 4.With the increase of slurry concentration,the compressive strength of the fling material first slowly increases and then rapidly increases.The recommended optimal slurry concentration is 62%-70%.With the increase of blast furnace slag content,the compressive strength of the fling material first increases and then tends to flatten.It is recommended that the blast furnace slag content be 20%.As the dosage of sodium hydroxide activator increases,the compressive strength of the fling material first increases and then decrease..It is recommended that the dosage of sodium hydroxide activator be 25%.Under the conditions of 20%blast furnace content,4 sand ash ratio,65%slurry mass concentration,and 25%sodium hydroxide content,the filling material was prepared and cured for 21d.After curing,the compressive strength of the fling material can meet the load requirements of a goaf roof thickness of 30 meters,a rock mass bulk density of 2.5 t/m3,and a gravity load calculation of 0.75 MPa.The fling structure is stable and meets the strength requireme

关 键 词：铁矿 开采 充填 力学性能 抗压强度 

分 类 号：TU432[建筑科学—岩土工程]