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A kind of pulverized coal biological oxidation desulfurization method

A technology of biological oxidation and pulverized coal, applied in biochemical equipment and methods, microorganism-based methods, microorganisms, etc., can solve problems such as poor removal of organic sulfur

Active Publication Date: 2018-01-30
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical method mainly uses magnetic separation, electrostatic separation and jigging method, etc., and basically uses the parameters of magnetic properties, electric charge and density of coal powder to separate. The main purpose is to remove sulfur-containing particles, mainly for It is pyrite, but the removal effect on organic sulfur is poor

Method used

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  • A kind of pulverized coal biological oxidation desulfurization method
  • A kind of pulverized coal biological oxidation desulfurization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for biological oxidation desulfurization of pulverized coal, the sulfur content of the pulverized coal to be treated is 0.9%, carried out according to the following process steps, the process flow chart is as follows figure 1 Shown:

[0042] (1) Prepare 9K and Starkey medium:

[0043] Add (NH 4 ) 2 SO 4 , K 2 HPO 4 , MgSO 4 ·7H 2 O, Ca(NO 3 ) 2 , KCl, after all dissolved, adjust the pH to 2.0, sterilize at 121°C for 20min, add filter-sterilized FeSO after sterilization 4 ·7H 2 O, where (NH 4 ) 2 SO 4 , K 2 HPO 4 , MgSO 4 ·7H 2 O, Ca(NO 3 ) 2 and FeSO 4 ·7H 2 O concentrations were 3 g / L, 0.5 g / L, 0.5 g / L, 0.01 g / L, 10 g / L, and 0.01 g / L to obtain 9K medium;

[0044] Add (NH 4 ) 2 SO 4 , K 2 HPO 4 , MgSO 4 ·7H 2 O, CaCl 2 , sulfur powder, adjust the pH to 2.0 after fully dissolved, sterilize at 121°C for 20min, add filter-sterilized FeSO after sterilization 4 ·7H 2 O, where (NH 4 ) 2 SO 4 , K 2 HPO 4 , MgSO 4 ·7H 2 O, CaCl ...

Embodiment 2

[0057] A method for biological oxidative desulfurization of pulverized coal. The sulfur content of pulverized coal to be treated is also 0.9%. In the process steps, the medium preparation, the bacterial strain cultivation of ore leaching bacteria, the preparation of ore pulp, the bacterial inoculation amount of the ore leaching system, The ore leaching process, coal dust collection method, freezing-thawing, acid ultrafiltration, alkali ultrafiltration and the drying process before the sulfur content measurement are all the same as in Example 1.

[0058] Measurement of desulfurization rate of pulverized coal: The content of sulfur element in pulverized coal was measured by infrared sulfur detector to be 0.43%, and the desulfurization rate reached 64.98%.

Embodiment 3

[0060] A method for biological oxidative desulfurization of pulverized coal. The sulfur content of the pulverized coal to be treated is as high as 3.37%. In the process steps, the preparation of the medium, the cultivation of bacteria for ore leaching, the preparation of ore pulp, the amount of bacterial inoculum in the ore leaching system, and the leaching The drying process before the mine process, coal dust collection method, freezing-thawing, acid ultra, alkali ultra and sulfur content determination is all the same as in Example 1.

[0061] Measurement of desulfurization rate of pulverized coal: The content of sulfur element in pulverized coal was measured by an infrared sulfur detector to be 1.18%, and the desulfurization rate reached 64.99%. Due to the high content of sulfur in high-sulfur coal, the removal rate of sulfur is relatively high.

[0062] Table 1

[0063]

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Abstract

The invention provides a desulphurization method of coal dust via biological oxidation. The process comprises the following steps: (1) preparation of a medium; (2) culture of bioleaching bacteria; (3) preparation of pulp; (4) inoculation of bacteria in a leaching system; (5) ore leaching; (6) collection of coal dust; (7) freezing-thawing treatment; (8) ultrasonic treatment with alkali for the coal dust; (9) ultrasonic treatment with acid for the coal dust; (10) drying of the coal dust; (11) determination of desulfurization rate of the coal dust. The ore leaching is carried out with synergistic effects of three species of bacteria at normal temperature and normal pressure, freezing-thawing, ultrasonic treatment with alkali, and ultrasonic treatment with acid are combined, so that sulfur in the coal dust is oxidized into sulfate and dissolved in water for separating from the coal dust; the desulfurization rate of the coal dust after treatment reaches above 50%, the sulfur content of the coal dust after treatment is below 1.2%, the lowest sulfur content is 0.35%, and the discharge meets the environmental protection requirements.

Description

technical field [0001] The invention belongs to the technical field of biometallurgy, relates to microbiology and mineralogy, and provides a method for biological oxidation desulfurization of pulverized coal. The chemoautotrophic bacteria used in the ore leaching process are Thiobacillus ferrooxidans ( T. f ), Leptospira ferrooxidans ( L. f ) and Thiobacillus thiooxidans ( T.t ). Background technique [0002] As an important chemical raw material and fuel, coal has always occupied an important position in the national economy. The sulfur content in coal in my country is generally 0.38-5.32%, and with the increase of coal seam mining depth, the sulfur content tends to increase. With the decreasing fossil fuel resources at home and abroad, it is inevitable to use high-sulfur coal resources. The sulfur in coal is divided into inorganic sulfur mainly composed of pyrite and organic sulfur represented by dibenzothiophene (DBT). environmental pollution. 90% of sulfur dioxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L9/00C12N1/20C12R1/01
CPCC10L9/00C12N1/20
Inventor 朱宏飞
Owner LIAONING TECHNICAL UNIVERSITY
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