Phosphorus slag is an industrial waste produced in the production of yellow phosphorus by the electric furnace method. For each 1 t of yellow phosphorus produced, it is necessary to discharge 8~10 t of phosphorus slag. Coal gangue is a solid waste produced in the coal industry. It is discharged from 10% to 15% of annual coal production. It has accumulated more than 4.5 billion tons of storage, which is the largest solid waste in China. Since a large amount of unexploited solid waste occupied industrial and agricultural land, safety problems and environmental pressures are presented. The disposal of solid waste is an urgent task. Therefore, the effective use of the solid waste resources and turning waste into treasure have important practical significance. In recent years, the glass-ceramics based on solid waste has been widely used in building decoration field. However, the technology has not been widely used due to high cost and defects in the preparation process. In this work, the feasibility of preparing glass-ceramics by the combination of phosphorus slag and coal gangue was studied. The effects of heat treatment temperature on the crystalline phase composition, microstructure and properties of the glass-ceramics were also discussed via differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Powder base glass was obtained by melting phosphorus slag with coal gangue at 1250℃ for 2 h. The results indicated that the sintered glass-ceramics with pseudo wollastonite Ca3(Si3O9) as the main crystallization phase could be prepared after heat treatment at 850℃ for 2 h. The flexural strength, microscopic strength and bulk density of the sample were 74.4 MPa, 566.9 HV and 2.75 g/cm3, respectively. In addition, with the increase of heat treatment temperature, the main crystalline phase of the glass-ceramics changed from Ca3(Si3O9) to wollastonite (CaSiO3), the morphology of the crystal developed from spherical to the needle-like and short column, which were beneficial for improving the flexural strength. Both the microscopic strength and bulk density increased first and then decreased with the increase of heat treatment temperature.
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