硅锰渣人造骨料的制备工艺及性能研究

硅锰渣是铁合金产业的工业废渣之一。本研究采用冷黏结法制备硅锰渣人造骨料,通过探究造粒机倾角、频率和成球时间对硅锰渣骨料性能及粒径分布的影响,确定出最佳造粒工艺条件倾角为50°、频率为15 Hz和成球时间为70 min,在此基础上研究了固体和液体碱激发剂加入量、养护温度和两种硅锰渣类型(TYGM、BLGM)对骨料性能的影响,采用抗压强度试验机测试骨料单球和筒压强度,并按照其它标准测试骨料的堆积密度、颗粒密度和吸水率。结果表明,当液体激发剂、固体激发剂加入量分别为16.2%、20%,养护温度为室温时,制备出的骨料性能最优,其堆积密度分别为1397.5、1422.7 kg/m3^,7 d吸水率分别为5.3%、5.4%,7 d筒压强度分别为17.6、8.9 MPa。由TYGM制备的骨料单球强度优于BLGM,TYGM在112 d时骨料强度达到最大为18.88 MPa,而BLGM在119 d时骨料强度达到最大为13.31 MPa。

Study on preparation technology and properties of silicon manganese slag artificial aggregate

In this study, the cold bonding method was used to prepare silico-manganese slag artificial aggregate. By exploring the influence of granulator inclination angle, frequency and pelletizing time on the performance and particle size distribution of silico-manganese slag aggregate, the optimal granulation process condition was determined as the inclination angle. 50°, frequency 15 Hz and ball formation time 70 min. On this basis, the effects of solid and liquid alkali activator additions, curing temperature and two kinds of silicon manganese slag on aggregate properties were studied. The results show that when the liquid activator and solid activator are added in an amount of 16.2% and 20%, respectively, and the curing temperature is room temperature, the prepared aggregate has the best performance. The compressive strength of the 7-day cylinder is 17.6 ~ 8.9 MPa. The single ball strength of the aggregate prepared from TYGM is better than that of BLGM. The aggregate strength of TYGM reaches a maximum of 18.88 MPa at 112 d, while that of BLGM reaches a maximum of 13.31 MPa at 119 d.