Desulfurization method of coal

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of coal treatment, in particular to a coal desulfurization method. Background technique [0002] Coal accounts for more than 50% of my country's energy structure. With the increase of coal mining depth, the proportion of high-sulfur coal production in my country is also increasing. The composition and form of sulfur in coal are changeable, and the sulfur in coal can usually be divided into two categories: inorganic sulfur and organic sulfur according to the form of sulfur in coal. Inorganic sulfur is sulfur that exists outside the coal matrix in the form of inorganic minerals, including sulfide sulfur and sulfate sulfur, and a small amount of elemental sulfur. The main minerals are pyrite (FeS 2 ) mainly, a small amount of marcasite (FeS 2 )Wait. Organic sulfur is the sulfur existing in the coal matrix in the form of organic sulfide, which cannot be removed by physical beneficiation. At present, coal des...

AI Technical Summary

Problems solved by technology

Desulfurization by physical beneficiation mainly uses gravity separation (such as heavy medium, jigging, shaking table, etc.) to reduce ash and desulfurize. Generally, it can only remove pyrite sulfur with large particles. For fine particles, especially finely dispersed Pyrite sulfur in the coal matrix (embedded particle size is less than 100 microns), it is difficult to effectively desulfurize by gravity separation

Images