Abstract

In this paper, the effects of open-air and hot-air oven drying on the development of fibers of bentonite were studied using scanning electron microscopy (SEM), X-ray diffraction (XRD) and environmental scanning electron microscopy (ESEM). The fiber bonding mechanism of bentonite in iron ore briquettes was studied after drying at different temperatures (105, 150, and 250 °C, respectively) in a hot-air oven. The formation of interparticle fiber bonding was observed at 105 °C while, above this temperature breakage of fiber bonds takes place that tends to lower compressive strength. This also shows that the formation of interparticle fiber bonds was significant at 105 °C. When the iron ore briquette was dried in a hot-air oven, the formation of fiber bonds and increased compressive strength of 4.018 N/mm² was observed. The hot-air oven drying was found to be much more favorable for bentonite fiber bond formation than open-air drying.

摘要

本文利用扫描电子显微镜（SEM），X射线衍射（XRD）和环境扫描电子显微镜（ESEM）研究了露天和热风干燥对膨润土纤维生长的影响。在热风炉中于不同温度（分别为105、150和250℃）下干燥后，研究了膨润土在铁矿石团块中的纤维粘结机理。在105℃下观察到颗粒间纤维粘结的形成，而在该温度以上，发生了纤维粘结的断裂，这倾向于降低抗压强度。这也表明颗粒间纤维键的形成在105℃下是显着的。当铁矿石团块在热风炉中干燥时，纤维键的形成和增加的抗压强度为4.018 N / mm ²被观测到。发现热风烤箱干燥比露天干燥更有利于膨润土纤维粘结的形成。