Spherical magnesium oxide was prepared by aerosol-assisted method using magnesium chloride as the magnesium source and urea as the precipitant. The precursors and magnesium oxide samples prepared at different reaction temperatures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR) and nitrogen adsorption-desorption. The experimental results showed that the specific surface area of the prepared spherical magnesium oxide was 36 m2/g, the average pore size was 34 nm, and the total pore volume was 0.26 cm3/g. The adsorption of Congo red was in accordance with the pseudo-secondary kinetics, and the adsorption equilibrium was reached within 5 min. The adsorption isotherm was in accordance with the Langmuir model, and the saturation adsorption capacity was 764.91 mg/g.
The invention provides a spherical magnesium oxide, said spherical magnesium oxide magnesium oxide purity content ≥ 85%, average particle size 2150μm, sphericity ≥ 0.86, water content ≤ 8%wt, density 3.03.8g/cm; also provides a spherical magnesium oxide preparation method, including the provision of 89%99% purity, particle size 590μm, water content ≤ 3%wt magnesium oxide powder; will magnesium oxide The powder is melted by flame melting method to form a spherical droplet-like melt, and the combustion gas is selected from oxygen and natural gas to form a high temperature flame; cooling and shaping to form spherical magnesium oxide; and grading the spherical magnesium oxide. The beneficial effect of the invention is...
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