Abstract
In view of the fugitive dusts caused by wind disturbance and material handling in coal bunkers, surface plants, and open-air coal stocking yards of coal businesses, the solidifying dust suppressant based on modified chitosan is synthesized and prepared through the chemical modification of –NH2 with chitosan as a raw material and –NH2 was replaced by –CH2CH(OH)CH2N+(CH3)CI− through the technique of Fourier transform infrared spectroscopy. According to viscosity experiment results, the viscosity of the modified solidifying dust suppressant increased significantly. The coal particles suppressed by the dust suppressant as observed with a 50,000X scanning electron microscope were coagulated together, which indicated very good cohesion effect. In addition, wind erosion resistance experiment was conducted to analyze the wind erosion rate of coal powders before and after sprayed with the suppressant at different wind speeds, which indicated that the dust suppressant can effectively prevent fugitive dusts at a wind speed of 17 m/s.
Highlights
According to the statistics of the Ministry of Environmental Protection, the dust pollution caused by material handling; loading or offloading; and wind disturbance in coal bunkers, surface plants, and open-air coal stocking yards of coal businesses has become a major source of pollution from industrial production, traffic and transportation, and storage (Li, 2012; Organiscak and Randolph reed, 2004)
What’s worse, there are a large amount of hydrophobic groups in coal dust which have poor water holding capacity, so a composite dust suppressant cannot solve the issue of fugitive dusts in coal mines with open sources of dust (Gosiewska et al, 2002; Zhu and Wang, 2012)
On the basis of combining the excellent properties of the raw material itself, changing the water solubility, viscosity, and improving the solidifying performance and excellent wind erosion resistance to synthesizing a new solidifying dust suppressant, and it is applicable to the solidification and suppression of coal dusts
Summary
According to the statistics of the Ministry of Environmental Protection, the dust pollution caused by material handling; loading or offloading; and wind disturbance in coal bunkers, surface plants, and open-air coal stocking yards of coal businesses has become a major source of pollution from industrial production, traffic and transportation, and storage (Li, 2012; Organiscak and Randolph reed, 2004). Due to the poor water solubility, CTS is partially limited and cannot be widely applied as a dust suppressant for coal mines (Filipknowskal and Rodziewiczl, 2012; Lasheras-Zubiate et al, 2010; Rabelo et al, 2012) Due to this reason, on the basis of combining the excellent properties of the raw material itself, changing the water solubility, viscosity, and improving the solidifying performance and excellent wind erosion resistance to synthesizing a new solidifying dust suppressant, and it is applicable to the solidification and suppression of coal dusts
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