Desulfurization method of coal

A technology for coal and raw coal, applied in solid separation and other directions, can solve problems such as difficult desulfurization

Inactive Publication Date: 2021-09-07
许泽胜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0079] A gas-fertilized coal contains 2.83wt% sulfur, and the particle size distribution of fine pyrite in the coal is shown in Table 1 under microscope observation.

[0080] Table 1 The particle size distribution of fine-grained pyrite in gas-fertilized coal

[0081] Distribution particle size <5μm

5~10μm 10~20μm 20~50μm >50μm percentage% 36.6 34.2 10.4 13.2 5.6

[0082] The coal is crushed and sieved and then ground to an average particle size of 30 microns or less. The flotation concentration is 8wt%, kerosene is added, the dosage is 1200g / t raw coal, and the rotating speed of the high-shear agglomeration generator is 35000rad / min for 15min, adding sodium bicarbonate and water to make the pH value of the coal slurry 8.2, at room temperature Stir at low temperature for 1 min, then temper the coal slurry, change the surface potential of the flotation coal particles and pyrite particles, and strengthen the hydrophobicity of the coal particl...

Embodiment 2

[0085] A certain coking coal in Shanxi contains 3.08wt% sulfur. The particle size distribution of fine pyrite in the coal is shown in Table 2 under microscope observation.

[0086] Table 2 The particle size distribution of fine-grained pyrite in coking coal

[0087] Distribution particle size <5μm

5~10μm 10~20μm 20~50μm >50μm percentage% 28.7 35.5 11.8 14.2 9.8

[0088] The coal is crushed and sieved and then ground to an average particle size below 40 microns. The flotation concentration is 8wt%, kerosene is added, the dosage is 1000g / t raw coal, and the speed of the high shear agglomeration generator is 35000rad / min for 15min, and sodium carbonate and water are added to make the pH value of the coal slurry 8.0. Stirring for 1min, tempering the coal slurry, changing the surface potential of the flotation coal particles and pyrite particles, and strengthening the hydrophobicity of the coal particles, so that the coal particles with natural ...

Embodiment 3

[0091] A certain coking coal in Inner Mongolia contains 3.21wt% sulfur, and the particle size distribution of fine-grained pyrite in the coal is shown in Table 3 under microscope observation.

[0092] Table 3 The particle size distribution of fine-grained pyrite in coking coal

[0093] Distribution particle size <5μm

5~10μm 10~20μm 20~50μm >50μm percentage% 12.6 27.8 41.8 11.5 6.3

[0094] The coal is crushed and sieved and then ground to an average particle size of less than 50 microns. The flotation concentration is 8wt%, diesel oil is added, the amount is 1400g / t raw coal is processed by high shear agglomeration generator at a speed of 35000rad / min for 15min, calcium oxide and water are added to make the pH value of the coal slurry at 8.1, at room temperature Stirring for 1min, tempering the coal slurry, changing the surface potential of the flotation coal particles and pyrite particles, and strengthening the hydrophobicity of the coal p...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/00B03B1/00B03B1/04
CPCB03B9/005B03B1/00B03B1/04
Inventor 许泽胜许文昊
Owner 许泽胜
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