Abstract
To control the dust pollution caused by open-pit coal mining and reduce or avoid the secondary hazards of existing dust suppressants to the environment, a biological dust suppressant was prepared through the synergistic effect of a surfactant and an enzyme-induced carbonate precipitation. The optimal ratio of biological dust suppressant was determined, and the dust suppressive effect and dust consolidation mechanism of the biological dust suppressant were investigated. The results showed that the optimal biological dust suppressant had an alkyl polyglycoside (APG) concentration of 0.3 wt.%, a urea-CaCl2 concentration of 0.6 mol/L, and a urease to urea-CaCl2 volume ratio of 1:3. The wind erosion resistance of coal dust treated with this dust suppressant was enhanced by 86.69%. The adsorption of the biological dust suppressant by coal dust was mainly due to the electrostatic interaction between the surfactant and coal dust. The mineralization product of the dust suppressant was calcite-type CaCO3, which consolidated coal dust due to the formation of intermolecular hydrogen bonds between CaCO3 and coal dust.
Highlights
In recent years, with the progress of science and technology and the improvement of mechanical automation level, the production efficiency of the open-pit coal mine has been improved rapidly (DixonHardy et al, 2008)
The effect of surfactant on urease activity is attributed to the electrostatic interaction between surfactant and urease and the electrostatic potential generated by surfactant
A biological dust suppressant was prepared based on the synergistic effect of surfactant and enzyme-induced carbonate precipitation
Summary
With the progress of science and technology and the improvement of mechanical automation level, the production efficiency of the open-pit coal mine has been improved rapidly (DixonHardy et al, 2008). Studies have shown that long-term exposure to high concentrations of coal dust has serious effects on the body, such as chronic stomach disease and noise induced deafness (Musselman et al, 2016; Zhang et al, 2019; Wang et al, 2020; Fu et al, 2021). This shows that the control of coal dust in open-pit coal mine is imminent. It is of great significance to find a dust suppressant that is simple to prepare and environmentally friendly
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