Abstract
In this paper, a highly efficient and environmentally-friendly dust depressor was developed based on the sodium lignosulfonate–acrylic acid graft copolymer. Using the grafting ratio as an index, a three-factor and four-level orthogonal experiment was conducted to optimize the fabrication conditions of the graft copolymer. At a reaction temperature of 60 °C, feed ratio mSLS–AA of 1 : 3, and FeSO4·7H2O content of 2.5%, the prototype produced the highest grafting ratio. The microstructure of the graft copolymer was measured using Fourier transform infrared spectrometry (FTIR) and nuclear magnetic resonance (1H-NMR). Furthermore, the influence of glycerol and the JFC penetrant on the contact angle between the compound solution and coal powder was investigated. Finally, four formulas of dust depressor were selected based on the experimental results. The dust-control performance of the four dust depressors was then tested on a large-scale spray dust suppression simulation platform. The results show that after applying formula 1 at various distances from the spray field, the average dust reduction rates of the total dust (respirable dust) at each point increased. Compared to the water-spraying dust suppression technique, the dust concentration is significantly reduced after the graft copolymer dust depressor is applied.
Highlights
IntroductionThe crosslinking structure formed from the reaction between carboxyl and hydroxyl in the molecule chain or SLS can greatly enhance the viscosity of the copolymer.[17,18,19] the inclusion of SLS in a chemical dust depressor has a number of advantages
In recent years, there has been an ever-increasing environmental issue in industrial working areas, due to pollutants that consist mainly of inhalable particles (PM10) and ne particles (PM2.5)
The Fourier transform infrared spectrometry (FTIR) spectrum con rms the introduction of acrylic acid (AA) into SLS, the 1H-NMR spectrum shows that the variation of the group peak position for the gra copolymer is consistent with the FTIR results
Summary
The crosslinking structure formed from the reaction between carboxyl and hydroxyl in the molecule chain or SLS can greatly enhance the viscosity of the copolymer.[17,18,19] the inclusion of SLS in a chemical dust depressor has a number of advantages. Most of the studies in this area concentrated on the conversion of glycerin, while little has been explored with regard to utilizing it in new ways.[22] It has been reported that glycerin can act as an auxiliary to increase the crosslinking degree among the large molecule chains of the gra copolymer, and expand the threedimensional water-absorption space by forming a network structure.[23,24] in this paper, based on GSS–A, a new type of highly efficient and environmentally-friendly dust depressor is synthesized using glycerin as a wetting agent and the JFC penetrant as excipients. A er separation and puri cation, the product was weighed, and the GCS–A yield was calculated following the process in ref
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