电炉镍铁渣粉对水泥胶砂强度的影响试验研究  

Experimental study on effect of ferronickel slag powder on strength of cement mortar

作　　者：付海峰 李天翮 秦文茜 杨飞 张明星[1,2] FU Haifeng;LI Tianhe;QIN Wenqian;YANG Fei;ZHANG Mingxing(School of Environment and Resources,Southwest University of Science and Technology,Mianyang Sichuan 621000,China;Sichuan Engineering Lab of Non-metallic Mineral Powder Modification and High-value Utilization,Mianyang Sichuan 621000,China)

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621000 [2]四川省非金属矿粉体改性与高质化利用技术工程实验室,四川绵阳621000

出　　处：《化工矿物与加工》2020年第3期51-55,共5页Industrial Minerals & Processing

基　　金：悬浮玻璃新技术国家重点实验室开放基金(2018KF04);西南科技大学龙山学术人才科研支持计划重点支持项目(18LZX659);西南科技大学研究生创新基金资助项目(19ycx0040)。

摘　　要：为探究电炉镍铁渣细粉粒度和掺量对水泥胶砂强度的影响,以广州某公司电炉镍铁渣为原料,通过蒸汽动能磨制备4种粒度的电炉镍铁渣细粉,考察不同粒度和不同掺量的电炉镍铁渣细粉对水泥抗压强度的影响。试验结果表明:在电炉镍铁渣粉掺量一定的情况下,当粒度d50=12~25μm时,试样7、28 d的抗压强度急剧增大,粒度d50=25~38μm时的抗压强度急剧减小;而粒度在25μm时,28 d强度达到最大,为44 MPa,28 d活性指数为80%,说明电炉镍铁渣在用作水泥掺和料时,并非粒度越小活性越高,强度越大,而是存在一个最优的掺和粒度,即d50=25μm;由d50=25μm电炉镍铁渣替代量分别为10%~50%的水泥胶砂强度试验结果可知,随着电炉镍铁渣掺量的增加,水泥抗压强度不断降低,经过热蒸汽粉碎分级后的镍铁渣在20%掺量下的水泥胶砂28 d抗压强度为49.1 MPa,较前人的研究提高了8.9 MPa。In order to explore the effect of the particle size and content of ferronickel slag powder on the strength of cement mortar,four kinds of ferronickel slag powder with different particle size were prepared by steam kinetic energy grinding from the ferronickel slag of a company in Guangzhou to study the effect of ferronickel slag powder with different particle size and content on the compressive strength of cement.Under the condition that the content of ferro nickel slag powder in electric furnace is constant,when the particle size d50=12~25 μm, the compressive strength of the samples increases sharply in 7 and 28 days,and the compressive strength of the samples decreases sharply in 25~38 μm. When the particle size is 25 μm, the maximum compressive strength is 44 MPa and the activity index in 28 days is 80%, which indicates that when ferronickel slag is used as cement admixture, there is not an optimal admixture size, i.e. d50 =25 μm, but the smaller the particle size, the higher the activity and the stronger the strength.The test results of cement mortar strength with d50=25 μm and substitution amount of 10%~50% respectively show that the compressive strength of cement decreases continuously with the increase of the content of ferronickel slag in the electric furnace.The compressive strength in 28 days of the cement performance of ferronickel slag after being crushed and graded by superheated steam at the same content of 20% is 49.1 MPa, which is 8.9 MPa higher than that of the previous studies.

关 键 词：过热蒸汽 电炉镍铁渣 粒度 掺量 水泥胶砂 抗压强度 活性指数 

分 类 号：TQ172[化学工程—水泥工业]