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Preparation method of inhibitor for spontaneous combustion of coal based on magnesium ion compound

A compound, magnesium ion technology, applied in mining equipment, earthwork drilling, safety devices, etc., can solve the problems of low stability, generation of combustible or toxic gas, easy oxidation, etc. Effect

Pending Publication Date: 2021-12-14
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, scholars generally believe that taking measures before the critical temperature of coal is the key to preventing coal spontaneous combustion, but most of the physical inhibitors used have the following disadvantages: short inhibition time, low stability, easy decomposition and oxidation, generation of flammable or toxic gases, Fundamental issues such as complex processes

Method used

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  • Preparation method of inhibitor for spontaneous combustion of coal based on magnesium ion compound
  • Preparation method of inhibitor for spontaneous combustion of coal based on magnesium ion compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 22 parts by mass of MgCl that will be weighed 2 ·6H 2 Mix O powder with 50 parts by mass of water, stir for 5~10min, add 6 parts by mass of NaOH powder after completely dissolving, stir for 5min with a glass rod, add 0.37 parts by mass of vinyltriethoxysilane as a dispersant, and stir for 10min with a glass rod Allow it to fully react to obtain a mixed solution; place it in a dark place and seal it for 2 hours, filter, dry, and vacuum dry (85°C, 5 hours) to obtain a coal spontaneous combustion retardant based on a magnesium ion compound.

Embodiment 2

[0030] 30 parts by mass of MgCl after drying 2 ·6H 2 Mix O powder with 50 parts by mass of water, stir for 5 to 10 minutes to completely dissolve, add 8 parts by mass of NaOH powder, stir with a glass rod for 5 minutes, add 0.51 parts by mass of vinyltrimethoxysilane as a dispersant, and continue stirring for 15 minutes to fully react The mixed solution was obtained; placed in a dark place and sealed for 3 hours, filtered, dried, and vacuum-dried (90°C, 3 hours) to obtain a coal spontaneous combustion retardant based on magnesium ion compounds.

Embodiment 3

[0032] 26 parts by mass of MgCl after drying 2 ·6H 2 Mix O powder with 44 parts by mass of water, add 7 parts by mass of NaOH powder after completely dissolving, stir with a glass rod for 5 minutes, add 0.44 parts by mass of vinyl tris(β-methoxyethoxy)silane as a dispersant, and stir with a glass rod Allow it to fully react for 20 minutes to obtain a mixed solution; place it in a dark place and seal it for 2 hours, filter, dry, and vacuum dry (100°C, 4 hours) to obtain a coal spontaneous combustion inhibitor based on a magnesium ion compound.

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Abstract

The invention discloses a preparation method of an inhibitor for spontaneous combustion of coal based on magnesium ion oxide, and relates to the technical field of preparation of inhibitors for spontaneous combustion of coal. The method comprises the following steps: preparing a solution from a magnesium compound, adding a basic compound, carrying out a metal ion replacement reaction, conducting standing for 2-4 hours, carrying out suction filtration, and performing drying to obtain the inhibitor for spontaneous combustion of coal based on the magnesium ion compound. The preparation method is simple, green and safe in process, and a dispersing agent is added in a reaction process to modify the generated inhibitor, enhance adhesion with coal molecules and improve inhibition effect. A relatively stable magnesium hydroxide compound is generated, and redundant Mg<2+> in a solution jointly acts in the spontaneous combustion process of coal, so early-stage spontaneous combustion of coal can be effectively inhibited, and meanwhile, the service life of the inhibitor for spontaneous combustion of coal is guaranteed.

Description

technical field [0001] The invention relates to the technical field of preparation of coal spontaneous combustion retardants, in particular to a preparation method of coal spontaneous combustion retardants based on magnesium ion compounds. Background technique [0002] Coal is a combustible black or brown-black sedimentary rock that usually occurs in rock formations or veins called coal beds or seams. The coal spontaneous combustion process is a self-accelerating oxidation exothermic reaction. Oxygen molecules first form physical and chemical adsorption heat on the coal surface, causing the temperature of the coal body to rise slowly, and the temperature rise will prompt the oxygen molecules to overcome the potential resistance and the surface activity of coal molecules. The functional groups undergo deep oxidation and decomposition reactions to generate small molecular gases and release a large amount of reaction heat, which accumulates inside the coal body and eventually l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K21/02C09K21/06E21F5/00
CPCC09K21/02C09K21/06E21F5/00
Inventor 郭立稳白丽梅程子朦马玉新赵留成李绍英汪衢张梦婷朱令起候欣然
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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