铁尾矿-钢渣-磷渣协同制备矿物掺合料试验研究

Experimental study on synergistic preparation of mineral admixtures with iron tailings-steel slag-phosphorus slag

为解决铁尾矿利用率低的难题,将铁尾矿用球磨机机械粉磨1.5 h进行活性激发,将粉磨后的铁尾矿、钢渣和磷渣按照设计的配合比例进行协同试验研究,探究协同条件下的最佳配合比例。研究结果表明:铁尾矿、钢渣及磷渣以质量比为1∶2∶2制备新型矿物掺合料,其28 d抗压强度为40.2 MPa,活性指数达到92%;铁尾矿、钢渣、磷渣及矿渣粉以质量比为1∶1∶1∶2制备新型矿物掺合料,其28d抗压强度为44MPa,活性指数达到101%。因此,铁尾矿、钢渣及磷渣间存在协同作用,三者复配可有效提高铁尾矿复合体系的活性,所制成的复合掺合料可满足复合矿物掺合料Ⅰ级技术指标。

To solve the problem of low utilization of iron tailings,the iron tailings were mechanically ground using a ball mill for 1.5 hours to stimulate their activity.The ground iron tailings,steel slag,and phosphorus slag were studied in a coordinated experiment according to the designed ratio to explore the optimal coordination ratio under synergistic conditions.The results show that a new mineral admixture prepared with an iron tailings,steel slag,and phosphorus slag ratio of 1∶2∶2,has a compressive strength of 40.2 MPa and an activity index of 92%at 28 d.Another new mineral admixture prepared with an iron tailings,steel slag,phosphorus slag,and mineral powder ratio of 1∶1∶1∶2,has a compressive strength of 44 MPa and an activity index of 101%at 28 d.Therefore,there is a synergistic effect among the iron tailings,steel slag,and phosphorus slag,and the complex coordination of the three can effectively improve the activity of the iron tailings composite system.The resulting composite admixture can meet the technical requirements of grade I composite mineral admixtures.