高性能复合矿渣微粉的研究

发布时间：2018-04-29 04:04

  本文选题：矿渣 + 锰渣　； 参考：《河北科技大学》2016年硕士论文

【摘要】：矿渣微粉是一种重要的建筑材料,主要用于水泥、混凝土和砂浆生产。随着社会的发展,建筑物正朝着高层化、大跨度等方向发展,对于高强度、高活性建材的需求量日益增加。本文以矿渣和锰渣为主要原料,通过物理激发和化学激发,制备高性能复合矿渣微粉,实现废物的高值化利用。首先,在对高炉矿渣和水淬锰渣理化分析的基础上,采用物理激发(粉磨)的方法提高矿渣及锰渣活性。从众多助磨剂中筛选出丙三醇、硬脂酸钠、三乙醇胺、三异丙醇胺四种试剂并且经过复配制备出分别针对矿渣、锰渣高效专用助磨剂HB-1和HB-2。基于助磨机理分析,利用某增塑剂厂排放的废酸渣,经脱甲醇、中和及混料成型工艺,制备固体助磨剂HB-3,用于矿渣和锰渣的粉磨,效果良好。与其他助磨剂相比,该产品具有突出的成本优势,同时可以解决相关厂家废酸渣的排放问题。为了解决胶砂试块28d抗压强度测试周期过长的问题,建立了矿渣-锰渣微粉活性快速评价方法,该方法将实验周期缩短到24小时。操作方法为先常温养护4h然后60℃下蒸养24h。利用最小二乘法对实验数据进行拟合,得到两者关系式:R模拟28d=0.82R快速+28.23。模型与实际数据相关系数为0.99。研究了矿渣、锰渣的细度和配比对复合微粉性能的影响。结果表明:矿渣、锰渣的最佳比表面积为分别为519m2/kg、563m2/kg,最佳矿渣、锰渣物料配比为7:3。为了进一步提高微粉的活性,开发出矿渣、锰渣体系复合激发剂(硅铝酸盐4%、烧石膏3%、柠檬酸钠0.03%)。由此制备出高性能复合矿渣微粉,可以达到GBT12957-2005《用于水泥混合材的工业废渣活性试验方法》中的S105的等级,其物料配比为:矿渣65.1%、矿渣27.9%、复合激发剂7%。采用XRD以及SEM复合矿渣微粉的水化产物,探讨了体系的水化反应机理。该胶凝材料的水化产物主要是钙矾石、C-S-H、C-A-H以及一些无定形的凝胶类物质。体系的水化过程主要经历了三个阶段:(1)锰渣、矿渣解离及水化初期;(2)水化反应后期;(3)水化反应产物及未参与水化反应物料的凝聚及硬化。
[Abstract]:Slag powder is an important building material, mainly used in cement, concrete and mortar production. With the development of society, buildings are developing towards high-rise and large-span. The demand for high-strength and high-active building materials is increasing day by day. In this paper, high performance composite slag powder was prepared by physical and chemical excitation using slag and manganese slag as main raw materials, and the high value utilization of waste was realized. Firstly, based on the physical and chemical analysis of blast furnace slag and water-quenched manganese slag, the activity of slag and manganese slag was improved by physical excitation (grinding). Four kinds of reagents, propanetriol, sodium stearate, triethanolamine and triisopropanolamine, were selected from many grinding aids, and the specific grinding aids HB-1 and HB-2 were prepared respectively for slag and manganese slag. Based on the analysis of grinding mechanism, the solid grinding aid HB-3 was prepared by using the waste acid slag discharged from a plasticizer factory through methanol removal, neutralization and mixing molding process. It was used in grinding slag and manganese slag with good effect. Compared with other grinding aids, this product has outstanding cost advantages and can solve the problem of waste acid slag emission. In order to solve the problem that the test period of compressive strength of cement sand block is too long in 28 days, a fast evaluation method for activity of slag and manganese slag micro-powder is established, which shortens the experimental period to 24 hours. The operation method is: curing at room temperature for 4 hours and then steaming at 60 鈩，

本文编号：1818291