The invention belongs to the technical field of utilization of high-
sulfur and high-ash
coal, and particularly relates to a desulfurization and deashing method of high-
sulfur and high-ash
coal, which comprises the following steps: carrying out physical
coal dressing on the high-
sulfur and high-ash coal to obtain low-sulfur and low-ash coal of which the particle size is less than 0.5 mm, and carrying out photocatalytic oxidation on the low-sulfur and low-ash coal of which the particle size is less than 0.5 mm to obtain ultra-low-sulfur and low-ash coal; the photocatalytic oxidation method comprises the following steps: preparing low-sulfur and low-ash coal with the particle size of less than 0.5 mm into 4-12% ore pulp, putting the ore pulp into a reactor which has the
ultraviolet band of 200-300nm and is subjected to
photocatalysis through a modified TiO2 photocatalyst at normal temperature and normal pressure, continuously stirring for 6-12 hours at the speed of 800-1500rpm, adding or mixing H2O2 with the concentration of 5-50%, KHSO5 with the concentration of 0.01 mol / L-0. 20mol / L, Fe4 [Fe (CN) 6] 3 with the concentration of 0.2-1.0 mol / L or O3 oxidant with the concentration of 50-1000mg / L, and continuously stirring for 6-12 hours at the speed of 800-1500rpm. And reacting again at normal temperature and normal pressure for 3-6 hours to obtain the ultra-low-sulfur low-ash coal with
sulfur content of less than or equal to 0.3% and ash content of less than or equal to 8.0%. Through the synergistic effect of
ultraviolet, the photocatalyst and oxidation, the
sulfur content of the ultra-low-sulfur low-ash coal obtained through the flotation method is smaller than or equal to 0.3%, the ash content is smaller than or equal to 8.0%, and the
sulfur content of the ultra-low-sulfur low-ash coal obtained without the flotation method is smaller than or equal to 0.5%, and the ash content is smaller than or equal to 10.0%.