超细化铁尾矿——钢渣水泥基复合材料的制备及其性能研究  

Study on the Preparation and Properties of Ultra-fine Iron Tailings-Steel Slag Composite Cementitious Materials

作　　者：李华伟 王荣 王玉林 黎恒杆 LI Huawei;WANG Rong;WANG Yulin;LI Henggan(School of Civil Engineering and Architecture,Wuyi University,Wuyishan 354300,China;School of Civil Engineering Architecture and Environment,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]武夷学院土木工程与建筑学院,福建武夷山354300 [2]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《金属矿山》2022年第12期246-252,共7页Metal Mine

基　　金：福建省自然科学基金项目(编号:2020J01403,2019J01824)。

摘　　要：尾矿资源及冶金固废大量堆存,未能高效利用,从而造成了空气、土壤污染等重大环保问题。针对低活性的铁尾矿、钢渣固废材料,对铁尾矿进行超细化处理,并以经济简单的方式处理钢渣,用以制备复合胶凝材料。通过固定铁尾矿、钢渣复合体系的总掺量,研究了不同比例超细化铁尾矿、钢渣对复合胶凝材料体系力学性能与抗侵蚀性能的影响;利用扫描电镜(SEM)和X射线衍射仪(XRD)等微观手段,开展了铁尾矿—钢渣—水泥基三元复合胶凝材料的侵蚀机理及水化机理研究。研究表明:120 min的研磨时间可制得中值粒径为0.89μm的超细化铁尾矿;当超细铁尾矿∶钢渣为1∶3时,所制备的复合体系3 d、28 d抗压强度为9.7 MPa、29.8 MPa;钢渣的碱度有利于激发超细化铁尾矿中硅铝相的活性,所产生的协同效应有利于促进复合体系中水化产物的生成,提升结构性能。出于对材料力学与耐久性能的综合考虑,超细化铁尾矿∶钢渣∶水泥的掺入比例建议为1∶3∶6。若对所制备材料的抗侵蚀性能要求较高,可以适当提升超细化铁尾矿的掺入比例,但不宜超过胶凝材料总量的20%。Tailings and metallurgical waste are piled up in large quantities,which can not be used efficiently,resulting in air and soil pollution and other major environmental problems.For iron tailings and steel slag solid waste materials with low activity,iron tailings were treated with super refinement,and steel slag was treated in an economical and simple way to prepare composite cementitious materials.By fixing the total content of iron tailings and steel slag composite system,the effects of different proportions of ultra-refined iron tailings and steel slag on the mechanical properties and corrosion resistance of composite cementitious material system were studied.By means of scanning electron microscopy(SEM)and X-ray diffractometry(XRD),the erosion mechanism and hydration mechanism of iron tailings,steel slag-cement based ternary composite cementitious materials were studied.The results show that ultrafine iron tailings with a median particle size of 0.89μm can be prepared by grinding time of 120 min.When ultrafine iron tailings∶steel slag is 1∶3,the compressive strength of the prepared composite system is 9.7 MPa and 29.8 MPa for 3 d and 28 d.The basicity of steel slag is beneficial to stimulate the activity of Si-Al phase in super-refined iron tailings,and the resulting synergistic effect is beneficial to promote the generation of hydration products in the composite system and improve the structural properties.For the comprehensive consideration of material mechanics and durability,the mixing ratio of ultra-refined iron tailings∶steel slag∶cement is suggested to be 1∶3∶6.If the corrosion resistance of the prepared material is required to be higher,the incorporation ratio of ultra-refined iron tailings can be appropriately increased,but it should not exceed 20%of the total cementitious material.

关 键 词：超细化铁尾矿 钢渣 抗压强度 抗蚀系数 水化产物 

分 类 号：TD98[矿业工程—选矿]