不锈钢渣胶凝活性分析及其物理活化试验研究

GELLING ACTIVITY ANALYSIS AND PHYSICAL ACTIVATION TEST OF STAINLESS STEEL SLAG

开展不锈钢渣的胶凝性能和活化试验研究,既可解决不锈钢尾渣的堆存问题,也有助于解决相关建材行业的技术及成本等问题,达到节能减排的目的。介绍了胶凝材料的水化机理,利用岩相分析、XRD等技术,对不锈钢渣的化学组成、矿物组成进行了分析,确定了影响胶凝性能的因素。并通过物理活化试验,研究了粉磨时间、混磨工艺、颗粒细度对不锈钢渣胶凝活性的影响,探讨了不锈钢渣的工程性能及安定性。结果表明,不锈钢渣主要矿物组成是硅酸二钙、镁硅钙石、RO相,以及少量硅酸三钙、尖晶石固溶体和金属单质等,主要硅酸盐矿物的岩相特征与硅酸盐水泥熟料特征基本相同,保证其具有一定的胶凝性能;控制粉磨时间为2 h,混掺4%~5%粉煤灰或10%~12%高炉矿渣,可使不锈钢渣具有一定的细度,进而增加比表面积,提高胶凝活性。不锈钢渣作为水泥基材的工程性能符合相关技术标准,安定性合格。

The study on gelling activity and activation test of stainless steel slag can not only solve the tailing storage of stainless steel,but also help to solve the technical and cost problems of construction material industry,so as to achieve the purpose of energy conservation and emission reduction.The hydration mechanism of cementitious materials was introduced.The chemical composition and mineral composition of stainless steel slag were analyzed by petrographic analysis and XRD,and the factors influencing the cementitious properties were determined.The effects of grinding time,mixing process and particle size on the cementitious activity of stainless steel slag were studied by physical activation test,and the engineering properties and stability of stainless steel slag were discussed.The results show that the main mineral composition of stainless steel slag is dicalcium silicate,magnesite,RO phase,and a small amount of tricalcium silicate,spinel solid solution and metal elements.The petrographic characteristics of the main silicate minerals are basically the same as those of Portland cement clinker,which ensures the slag has certain cementitious properties.The fineness of stainless steel slag can be increased by controlling the grinding time at 2 h and mixing with 4%~5%fly ash or 10%~12%blast furnace slag,thereby increasing the specific surface area and gelation activity.The engineering performance of stainless steel slag as cement base material meets relevant technical standards,and its stability is qualified.