Preparation and performance characterization of a composite dust suppressant for preventing secondary dust in underground mine roadways

[Display omitted] •Dust control in underground mine roadways.•Starch is grafted with methyl methacrylate and acrylamide.•Contact mode and contact mechanism between dust suppressor and dust layer.•Molecular dynamics simulation verified the relationship between pulverized coal, water, dust suppressor...

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Bibliographic Details
Published in:Chemical engineering research & design 2020-04, Vol.156, p.195-208
Main Authors: Sun, Jian, Zhou, Gang, Gao, Danhong, Wei, Zunyi, Wang, Naiguo
Format: Article
Language:English
Subjects:
Acrylamide
Composite dust suppressant
Composite materials
Crystal structure
Dust
Functional groups
Graft copolymerization
Mines
Molecular dynamics
Molecular physics
Molecular structure
Polymethyl methacrylate
Roads
Roads & highways
Simulation
Starch
Surfactants
Underground mine roadway
Underground mines
Underground roadways
Water chemistry
Wetting-coagulation
Wind resistance
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Summary:[Display omitted] •Dust control in underground mine roadways.•Starch is grafted with methyl methacrylate and acrylamide.•Contact mode and contact mechanism between dust suppressor and dust layer.•Molecular dynamics simulation verified the relationship between pulverized coal, water, dust suppressor and surfactant.•Method for combination of dust suppressor and coal is discussed from the viewpoint of molecular structure force. The purpose of this study is to prepare an environmentally friendly composite dust suppressant that can be used to wet the dust deposited in underground mine roadways, where it can effectively prevent the occurrence of dust. The dust suppressant is prepared by using starch as the raw material and methyl methacrylate and acrylamide as monomers, followed by mixing with a surfactant. FTIR, XRD and SEM are employed to compare the changes in the functional groups, crystal structure and microstructure of starch and the dust suppressant. Through the experimental effect of suppressant on dust, the effect and mechanism of the dust suppressant are determined. Through a wind resistance experiment and coagulum pressure testing, it is concluded that the dust suppressant has very good wind resistance and hardness. Finally, the structure and binding relationships between coal molecules, water molecules, the dust suppressant and the surfactant are verified by molecular dynamics simulations.
ISSN:0263-8762
1744-3563
DOI:10.1016/j.cherd.2020.01.030