Coal seam moistening method based on mussel bionic principle

A bionic principle and coal seam technology, applied in earthwork drilling, safety devices, mining devices, etc., can solve the problems of coal seam water injection wetting effect to be improved, coal seam water permeability is poor, surface free energy is low, etc., to improve coal seam water injection wetting effect, reduction of dust production, good hydrophilic effect

Inactive Publication Date: 2021-02-26
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low surface free energy of coal and the poor water permeability of coal seams, the water injection wetting effect of coal seams has been to be improved.
In the current research on coal seam water injection, adding surfactants to water is a common method to improve the water injection effect. Although this method can reduce the surface tension of water and i...

Method used

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  • Coal seam moistening method based on mussel bionic principle
  • Coal seam moistening method based on mussel bionic principle
  • Coal seam moistening method based on mussel bionic principle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Set up four groups of wetting agents for coal seam water injection with different dopamine concentrations. The dopamine concentrations are set to 0, 1mg / mL, 2mg / mL, and 3mg / mL respectively. At this time, polyacrylamide is added according to the molar ratio of dopamine to 1:1. , the concentration of copper sulfate is 5.3mM, and the concentration of hydrogen peroxide is 26.1mM. The preparation process of the coal seam water injection wetting agent is as described in the summary of the invention. The prepared briquettes were placed in four prepared wetting agents for coal seam water injection with different concentrations of dopamine. After 30 minutes of deposition, the briquettes were taken out and dried, and then the contact angle experiment was carried out. The experimental results are as follows image 3 shown.

[0048] from image 3 It can be seen from the figure that the contact angle of the raw coal used in the experiment is about 70°, and the contact angle changes ...

Embodiment 2

[0050] Set five groups of different deposition times, 0, 15min, 30min, 45min, 60min respectively. At this time, the concentration of dopamine is 2mg / mL, and the molar ratio of polyacrylamide to dopamine is 1:1. The concentration of copper sulfate is 5.3mM, hydrogen peroxide concentration is 26.1mM. The preparation process of the coal seam water injection wetting agent is as described in the summary of the invention. The prepared coal cake was placed in the prepared coal seam water injection wetting agent, deposited and modified according to five groups of time gradients, then the coal cake was taken out and dried, and then the contact angle experiment was carried out. The experimental results are as follows Figure 4 shown.

[0051] from Figure 4 It can be seen that the contact angle of the coal sample decreases significantly after the coal seam water injection wetting agent is deposited and modified. When the deposition time is 15 min, the contact angle of the coal sample ...

Embodiment 3

[0053] Set the molar ratio of five groups of different polyacrylamide and dopamine dosing, respectively set the molar ratio of polyacrylamide and dopamine dosing to 0:1, 0.5:1, 1:1, 2:1, 4:1, this When the dopamine is 2mg / mL, the concentration of copper sulfate is 5.3mM, and the concentration of hydrogen peroxide is 26.1mM. The briquettes were placed in five groups of coal seam water injection wetting agents with different dosing ratios of polyacrylamide and dopamine. After 30 minutes of deposition, the briquettes were taken out and dried, and then the contact angle test was carried out. The experimental results are as follows Figure 5 shown.

[0054] from Figure 5 It can be seen from the figure that compared with the coal samples modified by pure dopamine solution, the contact angles of the coal samples modified by four different polyacrylamide and dopamine dosing ratios are significantly reduced, and with the With the increase of polyacrylamide concentration, the overall...

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Abstract

The invention discloses a coal seam moistening method based on a mussel bionic principle, and relates to the technical field of coal mine dust prevention. The coal seam water injection wetting agent is prepared from the following raw materials: dopamine which is used for generating polydopamine through oxidation auto-polymerization under a weakly alkaline condition, polyacrylamide which is used for carrying out hydrophilic secondary modification on the formed polydopamine, copper sulfate which is used for increasing the speed of generating polydopamine through oxidation self-polymerization ofdopamine; hydrogen peroxide which cooperates with the copper sulfate and is used for increasing the speed of generating the polydopamine through oxidation and autopolymerization of the dopamine; sodium hydroxide which provides an alkaline environment for the solution, so that the pH value of the solution is 8.5-11; and water as a solvent. Dopamine is oxidized and auto-polymerized into polydopamine, and the polydopamine and polyacrylamide are subjected to Michael addition reaction and cross-linked with each other. After the water injection wetting agent is injected into a coal seam, the hydrophilicity of the coal surface can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of coal mine dust prevention, in particular to a coal seam enrichment method based on the mussel bionic principle. Background technique [0002] In underground coal mines, suspended coal dust can cause pneumoconiosis among coal miners and coal mine explosion accidents. With the continuous improvement of coal mining mechanization, the amount of dust produced in the coal mining process is also increasing. The total dust concentration of fully mechanized mining face can reach 1200-1500mg / m 3 , the concentration of respirable dust usually exceeds 300mg / m 3 . Due to long-term exposure to excessive coal dust, pneumoconiosis has become the most serious occupational disease among coal miners, and the number of pneumoconiosis patients is increasing every year. Therefore, how to reduce the concentration of mine dust to protect the health of coal miners has attracted much attention. [0003] At present, many techn...

Claims

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Application Information

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IPC IPC(8): E21F5/02E21F5/16E21F17/00
CPCE21F5/02E21F5/16E21F17/00
Inventor 赵艳云侯娇云胡相明邵志昂程卫民
Owner SHANDONG UNIV OF SCI & TECH
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