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As a new type of spherical glass functional material, hollow glass microspheres have broad application potential in many fields. In this paper, three kinds of hollow microspheres were obtained by spray drying-flame sintering method using waste flat glass as raw material and their corresponding strength were 5.34, 7.50 and 6.26 MPa, respectively. The physical and chemical properties, morphology, size and structure of the microspheres were analysed. It was found that the chemical compositions, particle size distribution and sintering temperatures of the microspheres had different effects on the strength of the microspheres. When sintering temperature was 900 °C and magnesium sulphate was added, the true density and the compressive strength of hollow glass microspheres were 0.94 g/cm³ and 8.03 MPa, respectively. [ABSTRACT FROM AUTHOR]

The porous ceramic was prepared by dry pressing with diatomite porous microspheres and glass powder porous microspheres as raw materials. The effect of sintering temperature on its open porosity, specific surface area, median pore diameter, compressive strength and crystal phase was studied, and its filtration performance including total bacterial removal efficiency, turbidity and chroma was studied. The research showed that the porous ceramics calcined at 800 °C had a compressive strength of (1.91 ± 0.09) MPa, a median pore diameter of 7.4 μm, a specific surface area of 2.91 m²/g, and an open porosity of 75%, which was beneficial to the improvement of water flux. The removal efficiency of more than 99% for the total number of colonies was achieved in this experiment using the filtration of the porous ceramics. The turbidity and chroma of the filtered water met the hygienic standard of drinking water. It was expected to be applied to the advanced treatment process of the water plant and the coarse filters in the terminal water treatment equipment, and had a good application prospect. [ABSTRACT FROM AUTHOR]

Using waste glass as raw material, hollow glass microspheres were prepared by spray drying. The effects of the types of foaming agents, sintering temperatures, particle size and feeding speed on the surface morphology and yield of hollow glass microspheres were studied. Results show that the particle size distribution was an vital factor limiting beads yield, and using inorganic salt and organic compound as composite foaming agent could increase the decomposition of foaming agent temperature range, which improved the efficiencies of microspheres, body foaming and yield. Furthermore, with the increase of sintering temperature and feed speed, the beads yields increased rapidly and then decreased gradually. In this study, when the quality fraction of foaming agent was 3%, sintering temperature was 850 °C and feeding wind speed was 1.6 m/s, the microbeads owned the maximum yield of 91%, the bulk density of 0.26 g/cm³, the true density of 0.55 g/cm³, and the compressive strength of 4 MPa. [ABSTRACT FROM AUTHOR]