The invention provides a desulfurization method of
coal, and belongs to the field of
coal treatment. The method comprises the following steps that high-
sulfur raw
coal is sequentially crushed, screened and ground to obtain coal particles; the coal particles, non-polar oil, a pH value
regulator and water are mixed and then subjected to shear agglomeration, and
coal slurry is obtained; the
coal slurry, a
foaming agent and a
flocculation stabilizer are mixed and then subjected to desulfurization flotation, and
clean coal is obtained. The method is an efficient flotation removal method for fine particles in the coal, especially
pyrite sulfur finely dispersed and embedded in a coking
coal matrix, shear agglomeration is adopted for treatment of the coal particles,
quenching and
tempering and hydrophobic strengthening treatment are carried out in the shear agglomeration process, and therefore the flotation false particle size similar to that under the conventional flotation condition of the coal particles is formed; the pH value
regulator is adopted, so that minerals, especially
pyrite, in the
coal slurry are more hydrophilic; a
flocculation inhibitor is adopted, the minerals, including
pyrite, in the coal
slurry are subjected to hydrophilic
flocculation, and dissociated pyrite minerals in the coal
slurry are effectively inhibited from entering
tailings.