Experimental Study on Preparation of Coal Gangue Magnetic Glass-Ceramics by Direct Sintering Method

Coal gangue is the waste generated during coal mining and processing. This paper aims to efficiently utilize coal gangue as a resource and reduce environmental load. Using coal gangue as the main raw material and copper tailings as auxiliary materials, magnetic glass-ceramics is prepared by direct sintering method. We examine the effects of different raw material ratios, sintering temperatures, and holding times on the structure and properties of magnetic glass-ceramics. The results show that when the coal gangue content is MGS-60wt%, the sintering temperature is 1180 ℃, and the insulation time is 50 minutes, the water absorption rate of magnetic glass-ceramics is 0.0028%, the volume density is 1.269g/cm3, and the magnetization strength is 0.533Gs. As the sintering temperature gradually increases and the holding time increases, its volume density shows a decreasing trend. The magnetization strength of magnetic glass-ceramics belongs to the weak magnetic range, with the lowest magnetization strength of 0.1Gs.