Experimental Study on the Desulfurization Performance of Magnesium Slag

An experimental study has been performed on the desulfurization performance of the original magnesium slag (from the process of magnesium production). CaO content is about 50% in the slag, but its conversion rate is below to 30% as desulfurizer directly in the experimental conditions. To enhance the performance of the slag the hydration treatment process is tried. In the hydration process, the slag, additives and water are mixed proportionally in slurry, then dehydrated and dried. By comparing different hydration parameters, the optimal hydration condition is found. The slag performance for desulfurization under different conditions, such as slag types, hydration time, additives and drying temperature, is investigated by TGA. The results show that a much higher calcium conversion rate (about 40%) of the slag is obtained after the hydration process.

By means of XRD, Sorptomtic Instrument and SEM, the related parameters of the original slag and the hydration treated slag are analyzed. It is found that the composition, appearance and surface area changed obviously. The principle is basically studied that the hydration may enhance the desulfurization performance of the slag.