Synthesis and performance characterization of an efficient coal dust suppressant for synergistic combustion with coal dust

Synthesis, performance, and adsorption mechanism of an environmentally friendly dust suppressant derived from guar gum for effective soil dust control

In this study, a novel dust suppressant (CMGG-AM) was synthesized by grafting acrylamide (AM) onto carboxymethyl guar gum. The synthesis process was optimized to determine the ideal conditions for the grafting reaction, and the optimal reaction conditions of the CMGG-AM were 2 g of carboxymethyl guar gum, 0.06 g of N, N'-Methylenebisacrylamide, 6 g of AM, and 0.2 g of potassium persulfate at 60 °C. The dust suppressant was characterized using XRD, TG-DTG, and FTIR analyses. CMGG-AM exhibited significantly superior resistance to wind erosion and water retention compared to conventional treatments. Following treatment with CMGG-AM, the sample demonstrated a 90 % dust suppression rate at a wind speed of 15 m/s and a 15 % moisture content after evaporation at 40 °C for 10 h. Particle size analysis and SEM imaging revealed that CMGG-AM facilitated the aggregation of dust particles and formed a robust protective film on the dust surface. Additionally, adsorption experiments and molecular dynamics simulations were meticulously designed to investigate the binding of CMGG-AM to soil dust. Adsorption experiments elucidated a single-layer physical adsorption mechanism, predominantly governed by hydrogen bonding forces. Molecular dynamics simulations further illustrated the spontaneity of the adsorption and the characterization of hydrogen bonds as the main driving force. These findings not only validate the practical applicability of CMGG-AM as an eco-friendly dust suppressant but also pave the way for future advancements in the sustainable management of soil dust pollution.

Preparation and performance study of carboxymethylated Napier grass (Pennisetum purpureum) cellulose dust suppressant

Coal mines generate significant amounts of dust during production, transportation, and stockpiling, leading to health hazards and environmental pollution. To address the inefficiencies and environmental impact of current chemical dust suppressants, a novel dust suppressant was developed utilizing cellulose derived from Napier grass (NG), modified through carboxymethylation, and supplemented with polyvinyl alcohol (PVA) and polyacrylamide (PAM). Orthogonal experiments identified the optimal ratio of sodium carboxymethyl cellulose (CMC), PAM, PVA, and octyl phenol polyoxyethylene ether (JFC-1) as 1:0.2:8:0.48. The resulting formulation exhibited a coal shell strength of 82 HA and a solution viscosity of 12.4 mPa·s. Structural changes and reaction mechanisms were elucidated using infrared spectroscopy and scanning electron microscopy. The performance evaluations demonstrated a water retention time of 7 h at 50 °C, a dust suppression efficiency of 99.56 % at a wind speed of 12 m/s, and a penetration depth of 10.2 mm within 1 h. Furthermore, the suppressant achieved a degradation rate of 38.46 % after 10 degradation cycles, representing a 28.31 % improvement compared to similar products. Molecular dynamics simulations provided insights into the dust suppression effect and interaction mechanism with coal. The novel dust suppressants satisfy dust suppression requirements during the unloading process of surface coal mining and mineral storage operations, while introducing an innovative application for NG.

Wetting-consolidation type dust suppressant based on sugarcane bagasse as an environmental material: Preparation, characterization and dust suppression mechanism

Coal mines generate a lot of dust during production and transportation, which not only damages the health of personnel, but also causes environmental pollution. Based on the problems of low extraction efficiency of cellulose matrix and low economy of existing dust suppressants for biomass materials, this paper uses bagasse extracted cellulose from sugar production waste as a matrix and adds polyvinyl alcohol and polyacrylamide as monomers to prepare a wetting-crusting type highly efficient environmental protection dust suppressant for coal mine production and transportation process. The dust suppression effect of the product was analyzed by the performance tests of dust suppression efficiency, consolidation layer strength and permeability. The dust suppression rate of the product prepared in this paper remained above 90% at the simulated wind speed of 10 m/s, the consolidation layer strength of 42.3 KPa was much higher than that of the pure water solution, and the average permeation rate within 30 min was greater than that of the surfactant solution. It is proved that the dust suppressant prepared in this paper has good dust suppression effect, high consolidated layer strength and good permeability, and the product prepared in this paper using environmentally friendly biomass raw materials has good degradability, and the mechanism of the dust suppressant is illustrated by MS simulation. The biomass dust suppressant can meet the requirements of dust suppression in the process of coal mining and transportation and is non-toxic and environmentally friendly.

Preparation and performance characterization of a new dust suppressant with a cross-linked network structure for use in open-pit coal mines

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.

Preparation and characteristics analysis of an ecoenvironmental protection cyclic solidification dust-fixing agent extracted from waste shrimp shells to suppress dust in coal resource-based cities

There are a lot of coal cinder and dust in the development of coal resource-based cities. Improper handling will cause dust flying, which has a great impact on urban residents and the environment. The purpose of this research is to follow the principle of waste recycling, to use waste shrimp shells to extract chitosan as a raw material, to carry out graft polymerization with acrylic acid and polyvinyl alcohol-1788, and to carry out amidation crosslinking reactions with ethylenediamine tetraacetic acid to produce products. The results showed that the degree of deacetylation of chitosan reached 85% with the optimized extraction method, which greatly shortened the process cycle. Through orthogonal experiments and osmotic wetting experiments, the best preparation process was determined. The reaction process, structure of the product and adhesive structure of the solidified layer were analyzed by FTIR, XPS and SEM. The thermal stability of the product was analyzed by thermogravimetry. Relevant performance tests showed that the product had good adhesion with dust, the hardness of the solidified layer could reach 98 HA, and the dust fixation rate was 92.67% when the wind speed was 15-18 m/s. It has the advantage of circulating dust fixation, which improves the utilization rate of resources.