机械粉碎矿渣微粉颗粒性质的实验研究

发布时间：2018-03-28 20:00

本文选题：高炉矿渣　切入点：机械粉磨　出处：《武汉理工大学》2013年硕士论文

【摘要】：矿渣是冶炼生铁时排放出的工业废渣,是一种具有良好潜在活性的胶凝材料,广泛应用于建筑材料领域。但是,这种潜在活性必需用机械粉磨的方式来激活。由于采用不同的粉磨方式及机理,矿渣微粉的宏观和微观性能存在很大的差异,而宏观和微观的差异是影响矿渣水化过程和结果的主要因素。因此,对机械粉碎矿渣微粉颗粒性能进行深入的研究与分析,总结粉磨过程中的变化规律及影响粉磨效果的微观特性因素,可为改善矿渣的易磨性和降低矿渣微粉粉磨能耗提供理论基础,同时对提高我国矿渣现有的应用水平,促进钢铁和水泥工业节能、减排发展具有重要的实际意义。本文全面、系统的研究与分析了不同方式机械粉碎的矿渣微粉颗粒性质,对粉磨过程矿渣微粉的粒度和粒度分布特征、微观形貌进行了实验研究,对微观形貌进行了量化分析,论文研究成果可为不同粉磨设备和工艺的产品特征分析和微观形貌量化提供一定的理论与实验研究基础。论文首先分析了机械粉碎矿渣常用的粉磨设备和粉磨工艺,论述了影响矿渣粉磨效果的因素。在此基础上,采用球磨和搅拌磨对矿渣进行了粉磨实验；对所获得的不同的矿渣微粉样品及工业立磨矿渣微粉产品,进行了激光粒度分析；运用电子显微成像原理,通过粉末制样方法的研究,获得了矿渣微粉的SEM图像,对不同粉磨方式的矿渣微粉的微观形貌进行了定性和定量分析。粒度分析及粒群特征参数研究结果表明：实验球磨、实验搅拌磨以及工业立磨矿渣粉颗粒粒群均符合RRB分布,工业立磨的粒度分布最窄,球磨矿渣微粉的粒度分布最宽,其均匀性比搅拌磨和工业立磨立磨矿渣粉差。随着粉磨时间的延长,矿渣微粉颗粒分布逐渐趋于均匀合理,颗粒中位径变小,80μm筛余减小,比表面积增加,粉磨到一定程度,应结合比表面积和特征粒径评价矿渣粉磨效果。微观形貌分析及定量研究结果表明：球磨和搅拌磨在粉磨初期,颗粒多为粗大砾石状,有部分多角状颗粒和磨蚀痕迹,随着粉磨时间的延长,接近等轴状的细小颗粒增多,多角状颗粒和磨蚀痕迹均减小。采用形状指数、圆度系数、扁平度、棱角度和表面粗糙度可定量表征矿渣粉体的微观形貌,球磨和搅拌磨粉磨过程中,随粉磨时间的延长,矿渣粉体群形状指数、扁平度、棱角度和表面粗糙度均减小,圆度系数增加,矿渣微观形貌将越趋于球形。实验球磨和搅拌磨矿渣微粉粉磨相同时间时,搅拌磨形貌优于球磨,球磨和搅拌磨矿渣粉圆度系数均高于我国水泥企业水泥的圆度系数平均值,工业立磨圆度系数明显低于球磨和搅拌磨,形状指数、扁平度、棱角度和表面粗糙度偏高。球磨和搅拌磨粉磨过程中的矿渣粉体群圆度系数、棱角度和表面粗糙度分布均符合正态分布,粉磨过程分布变化趋势基本相似。但搅拌磨圆度系数0.4以下颗粒相对球磨少,变化小；棱角度系数和表面粗糙度系数分布较球磨窄。
[Abstract]:Industrial waste slag is emitted when smelting pig iron, is a good potential activity of cementitious materials, widely used in the field of building materials. However, the potential activity required by mechanical grinding way to activate. Due to the use of different grinding methods and mechanism, there are great differences between the macroscopic and microscopic properties of slag powder however, the macroscopic and microscopic differences are the main factors that influence the slag hydration process and results. Therefore, in-depth research and Analysis on the mechanical grinding of slag particle properties, microscopic characteristics of regularity and influencing factors of grinding effect summed up in the process of grinding, can improve the grindability and reduce slag slag grinding the energy consumption and provide a theoretical basis, at the same time to improve the application level of our existing slag, steel and cement industries to promote energy-saving emission reduction, which has important practical significance.
In this paper, systematic research and analysis of different ways of mechanical grinding of slag particle properties, particle size and particle size distribution of slag powder grinding process, microstructure was studied. The microstructure of the quantitative analyses, provide the theoretical and Experimental Research on certain products based feature analysis and morphology of quantitative research for different grinding equipment and technology.
This paper first analyzes the mechanical crushing and grinding equipment and grinding process of slag used, discusses the factors influencing slag grinding effect. On this basis, using ball milling and grinding experiment of stirring mill slag; the different slag samples and industrial mill slag powder products, the use of electronic laser particle size analysis; microscopic imaging principle, through the study of powder sample preparation method, SEM image of slag powder was obtained, the microstructure of slag powder of different grinding methods of qualitative and quantitative analysis.
Particle size analysis and particle swarm parameters the results show that the experimental milling experiment, stirring mill and industrial mill slag powder particle swarm conformed to RRB distribution, industrial mill narrow particle size distribution, particle size distribution of slag powder is the widest, the uniformity ratio of stirring mill and industrial mill grinding slag powder difference with the grinding time, the particle size distribution of slag powder tends to be uniform and reasonable, the size of smaller particles, 80 m sieve residue decreases, the specific surface area increased and grinding to a certain extent, should be combined with the specific surface area and particle size characteristics evaluation of slag grinding effect.
The micro morphology analysis and quantitative research results indicate that the ball milling and mixing mill in grinding stage, particles are coarse gravels, some angular particles and abrasion mark, as the grinding time, fine particles near equiaxed polyhedral particles and increase abrasion mark decrease. The round shape index. Coefficient of flatness, edge angle, and surface roughness of the micro morphology of quantitative characterization of slag powder, ball milling and mixing mill grinding process, the grinding time, slag powder group shape index, flatness, edge angle and surface roughness decreased, roundness coefficient increases, the microstructure of slag the more spherical. The experiment of ball milling and mixing mill slag powder grinding the same time stirring mill is better than that of morphology milling, milling and grinding of slag powder mixing coefficient was higher than the number of roundness Department of cement enterprises of China's cement industry to establish the average. Roundness coefficient was significantly lower than that of ball milling and mixing mill, shape index, flat degree, high degree of angularity and surface roughness. The stirring ball milling and grinding process of slag powder group roundness coefficient, edge angle and surface roughness distribution accord with the normal distribution, distribution and changing trend of grinding process is similar. The mixing degree of roundness coefficient below 0.4 particle relative small changes; ball milling, edge angle coefficient and surface roughness coefficient distribution is milling narrow.

【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU521.4

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