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Efficient coal desulfurization method by flotation and biological coupling

A biological and high-efficiency technology, applied in the field of coal flotation-biological coupling desulfurization, can solve the problems such as the influence of desulfurization efficiency, and achieve the effect of low cost, mild treatment conditions and simple operation

Active Publication Date: 2017-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Desulfurization bacteria such as Rhodococcus erythropolis, Pseudomonas aeruginosa and Corynebacterium sp. are commonly used in biological desulfurization. Due to the simultaneous presence of inorganic sulfur and organic sulfur in coal, the organic sulfur Metabolic pathways are inhibited by inorganic sulfur metabolism, desulfurization efficiency is affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The method described in this embodiment mainly proceeds according to the following steps:

[0018] (1) Take Guizhou Liupanshui high-sulfur raw coal with a total sulfur content of 4.973%, grind it to a particle size below 150 mesh, and use XRD technology to analyze the sulfur phase in the coal, and prepare the medium according to the BSM medium formula;

[0019] (2) Using a composite collector, carry out flotation desulfurization treatment for 1 day according to the coal slurry concentration of 120g / L, and then filter; the formula of the composite collector is 40% dodecylamine, 25% alkylthioamino Formic acid ester, 12% n-octanoic acid, and the balance is water.

[0020] (3) Transfer the clean coal after flotation to the BSM medium containing Pseudomonas stutzeri LH-42 bacterial liquid for shaking flask culture, the initial bacterial concentration is 2×10 7 cells / mL, the culture conditions are initial pH 6.5, temperature 30°C, shaker speed 170r / min, and continuous desulf...

Embodiment 2

[0025] The method described in this embodiment mainly proceeds according to the following steps:

[0026] (1) Take Guizhou Liupanshui high-sulfur raw coal with a total sulfur content of 4.973%, grind it to a particle size below 150 mesh, and use XRD technology to analyze the sulfur phase in the coal, and prepare the medium according to the BSM medium formula;

[0027] (2) Using a composite collector, carry out flotation desulfurization treatment for 1 day according to the coal slurry concentration of 180g / L, and then filter; the formula of the composite collector is 42% dodecylamine, 25% alkylthioamino Formic acid ester, 10% n-octanoic acid, and the balance is water.

[0028] (3) Transfer the clean coal after flotation to the BSM medium containing Pseudomonas stutzeri LH-42 bacterial liquid for shaking flask culture, the initial bacterial concentration is 2×10 7 cells / mL, the culture conditions are initial pH 6.5, temperature 30°C, shaker speed 170r / min, and continuous desulf...

Embodiment 3

[0033] The method described in this embodiment mainly proceeds according to the following steps:

[0034] (1) Take Guizhou Liupanshui high-sulfur raw coal with a total sulfur content of 4.973%, grind it to a particle size below 150 mesh, and use XRD technology to analyze the sulfur phase in the coal, and prepare the medium according to the BSM medium formula;

[0035] (2) Inoculate Pseudomonas stutzeri LH-42 into coal-containing BSM medium for shaking flask culture, with an initial bacterial concentration of 2×10 7 cells / mL, the culture conditions are initial pH 6.5, temperature 30°C, shaker speed 170r / min, and continuous desulfurization treatment for 25 days;

[0036] (3) Use the pH-3C acidity meter to measure the pH and redox potential of the shaker flask desulfurization system every day, and measure the coal desulfurization rate by the Eschka method every 5 days;

[0037] (4) filter the coal handled in step (3), adopt composite collector, carry out flotation desulfurizatio...

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Abstract

The invention discloses an efficient coal desulfurization method by flotation and biological coupling. The method comprises the following steps: firstly pulverizing coal with a pulverizer to a grain size below 150 meshes, then carrying out removal of inorganic sulfur from coal by a flotation technology, and then carrying out removal of organic sulfur from the float coal by pseudomonas stutzeri LH-42; and flushing, filtering and drying the coal subjected to desulfurization treatment. The float coal after desulfurization by flotation and biological coupling has a total sulfur removal rate up to 67.83%. The method disclosed by the invention integrates the advantages of simple operation, high efficiency and rapidness of flotation desulfurization, integrates the advantages of mild conditions and low cost of biological desulfurization, and effectively protects the coal characteristics, such as combustion heat and coking property. The method disclosed by the invention can significantly improve the desulfurization efficiency of coal, brings higher comprehensive utilization values of the coal, and is a desulfurization technology with very promising market prospects.

Description

technical field [0001] The invention belongs to the field of coal clean utilization, and in particular relates to a coal flotation-biological coupling desulfurization method. Background technique [0002] Coal is the most abundant and widely distributed fossil fuel on earth. However, with the rapid development of the economy, high-quality low-sulfur coal is continuously consumed, and a large amount of medium-high-sulfur coal flows into the market. Its use has brought a series of environmental problems, such as acid rain and smog. Therefore, the traditional single desulfurization technology has been difficult to economically and effectively remove the sulfur in coal so that it can be used cleanly. However, people's demand for high-quality coal resources is increasing, making a large number of researchers focus on improving desulfurization technology to increase desulfurization efficiency. Flotation desulfurization has the advantages of fast speed, low cost and easy industri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L9/10C12N1/20C12R1/38
CPCC10L9/10C12N1/20
Inventor 杨宇张梦君高宇胡婷婷华垚堃朱振宇李爱民邱冠周
Owner CENT SOUTH UNIV
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