Abstract
In an effort to control dust pollution in open-air environments such as pit coal mines and coal transportation systems, a new dust suppressant with a cross-linked network structure was prepared. Graft copolymerization of soy protein isolate (SPI) and methacrylic acid (MAA), using potassium persulfate (KPS) as the initiator and hexametaphosphoric acid (SHMP) as the cross-linking agent, formed the network structure. The optimal MAA/SPI mass ratio for the dust suppressant was determined through a single-factor experiment to be 3:4, with 0.8 and 0.2 g of SHMP and KPS, respectively. The grafting reaction required 30 min at 60 °C. Scanning electron microscopy, energy-dispersive x-ray spectroscopy, Fourier-transform infrared spectroscopy, and differential scanning calorimetry were used to characterize the structure and application performance of the dust suppressant. The experimental results showed that the graft copolymerization reaction successfully formed the desired cross-linked network, and that when the cross-linked network material was sprayed on coal dust, it formed a dense, solidified shell, which effectively resisted wind erosion and served as a dust suppressant. The average reduction of the total suspended particulate matter of an open-air coal pile reached 79.95%, demonstrating effective dust suppression.
Highlights
China is one of the countries where coal is the main power source
The optimal methacrylic acid (MAA)/soy protein isolate (SPI) mass ratio for the dust suppressant was determined through a single factor experiment to be 3:4, with 0.8 and 0.2 g of sodium hexametaphosphate (SHMP) and KPS, respectively
The experimental results showed that the graft copolymerization reaction successfully formed the desired cross-linked network, and that when the cross-linked network material was sprayed on coal dust it formed a dense, solidified shell, which effectively resisted wind erosion and served as a dust suppressant
Summary
China is one of the countries where coal is the main power source. In the future, coal will still play a major energy role in China. North China is China’s main coal mining area, and the coal produced is stacked in open-air coal storage yards [1,2,3,4]. A new dust suppressant for use in open-pit coal mines has been synthesized with graft copolymerization so that it has a cross-linked network structure. The main material selected in the experiment is soy protein isolate (SPI), which has abundant sources, low cost, and biodegradability [19, 20]. It plays an important role in the development of environmentally friendly materials. We characterized its performance and tested its dust suppression capability in a field application[25,26,27]
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