梯级粉磨制备铁尾矿矿渣基胶凝材料

运用梯级粉磨技术制备铁尾矿矿渣基胶凝材料(TSBC），研究了梯级粉磨时间组合、材料配比和助磨剂对TSBC粉料粒度分布与浆体强度的影响，通过压汞、X射线衍射(XRD）和扫描电镜(SEM）研究了TSBC浆体的亚微观结构及水化产物，探讨了利用TSBC和铁尾矿砂制备活性粉末混凝土的可行性.结果表明：合理的梯级粉磨时间组合有利于TSBC粉料的颗粒分布宽化和亚微米级铁尾矿颗粒含量的增加，可改善TSBC浆体的孔结构和提高强度；材料配比主要通过影响TSBC的水化活性而影响浆体早期强度；掺入适量助磨剂使TSBC粉料粒径细化，增强组分的胶凝活性和填充效应，利于改善TSBC浆体的孔结构和提高强度；TSBC和原状铁尾矿砂可用于制备活性粉末混凝土.

Iron Tailings Slag Based Cementitious Materials Preparedby Cascade Grinding

Cascade grinding technology was used to product iron tailings slag based cementitious materials(TSBC).The influence of cascade grinding time, ratio of raw materials and grinding aids on cascade grinding in production of TSBC was studied in terms of particle size distribution, particle parameters and mechanical properties.The submicroscopic structure and hydration products of TSBC were observed by mercury porosimetry, XRD and SEM.The results show that reasonable cascade combination of grinding time is conducive to widening the particle size distribution of TSBC and increasing the content of submicron iron tailings in TSBC, and then improving its paste pore structure and strength. The material ratio mainly affects the early strength of TSBC slurry by influencing its hydration activity. The particle size of TSBC can be refined by adding appropriate grinding aids, which may help to enhance cementitious activity of the component and the filling effect.TSBC and original iron mine tailings can be used to prepare reactive powder concrete.