摘要
针对河钢矿业中关铁矿超细全尾砂充填采矿法存在的胶结体强度低和胶凝材料成本高等问题,利用钢渣、矿渣和脱硫石膏固体废弃物,开展钢渣基固结粉充填胶凝材料研究。对矿山可以利用的钢渣、矿渣和脱硫石膏等固废物料,进行物化特性分析与质量评价;开展尾砂全固废固结粉胶结充填体强度的正交试验,以及全尾砂充填料浆流变特性研究。试验结果显示,脱硫石膏对胶结体7 d强度的影响大于钢渣微粉,而钢渣微粉对胶结体28 d强度的影响大于脱硫石膏。根据矿山对胶结体强度和充填料浆流变特性的要求,确定钢渣基固结粉胶凝材料的优化配方为:钢渣30%,脱硫石膏10%、矿渣60%。基于胶砂比1∶4和质量分数为64%进行胶结充填体强度测试,其充填体7 d、28 d强度分别达到了1.98 MPa、3.3 MPa,满足矿山对胶结充填强度的要求。固结粉胶凝材料成本分别比42.5水泥和市售胶固粉降低38%、28%,中关铁矿工业化充填试验结果证明其值得在铁矿山推广应用。
Aiming at the problems of low cement strength of filling body and high cost of cementitious materials in the super-fine full tailings filling mining method of Zhongguan Iron Mine,the solid wastes including steel slag,slag and desulfurization gypsum were used to study the steel slag-based consolidation powder filling cementitious material.Firstly,the physical and chemical characteristics and quality evaluation of the solid waste materials of steel slag,slag and desulfurization gypsum which can be used in the mine were analyzed.Then,the orthogonal tests were conducted on the strength of the cemented body with tailings,solid waste materials and consolidation powder.And the rheological characteristics of the tailings filling slurry were studied.The test results show that the influence of desulfurization gypsum on the 7 d strength of cemented body is greater than that of steel slag powder,while the influence of steel slag powder on the 28 d strength of cemented body is greater than that of desulfurization gypsum.According to the mine requirements on the strength of cemented body and the rheological properties of filling slurry,the optimized proportion of steel slag-based consolidation powder cementitious material is determined as follows:steel slag of 30%,desulfurization gypsum of 10%,and slag of 60%.Finally,The strength test of cemented backfill was carried out based on the cement-sand ratio of 1∶4 and the mass concentration of 64%.The strength of the filling body reaches 1.98 MPa for 7 d and 3.3 MPa for 28 d,respectively,which can meet the requirements of cemented filling strength in this mine.The cost of this cementitious material is 38%and 28%lower than that of 42.5 cement and commercial cement-solid powder,respectively.The results of industrial filling test in Zhongguan Iron Mine prove that this cementitious material worths popularizing and applying in iron mines.
作者
冯圣杰
李胜辉
韩汉
高谦
涂光富
FENG Shengjie;LI Shenghui;HAN Han;GAO Qian;TU Guangfu(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Shahe Zhongguan Iron Mine Co.,Ltd,Hebei Iron and Steel Group,Xingtai,Hebei 054100,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第5期44-48,共5页
Mining Research and Development
基金
河北省重大科技成果转化专项项目(19073818Z).
关键词
铁矿山
超细全尾砂
钢渣基胶凝材料
Iron mine
Superfine full tailings
Steel slag-based cementitious material
