Diffusion and pollution of multi-source dusts in a fully mechanized coal face

J of Applied Polymer Sci

et al. 2018

Self Cite

To mitigate the dust dispersion pollution in the open-pit coal mines, this study experimentally develops a novel environmentally friendly coal dust suppressant. The experiment uses naturally biodegradable soybean protein isolate (SPI) as the main material and utilizes anion surfactant sodium dodecyl sulfate (SDS) to modify SPI. In the carboxymethylcellulose sodium and sodium silicate and other auxiliary agents, this process produces gives rise to the SDS-SPI coal dust suppressant. Experimental characterization of the developed dust suppressant reveals that the viscosity of the 5% dust suppressant solution can reach 24.6 mPa s. Correspondingly, the compressive strength reaches 0.48 MPa, and the dust suppression efficiency can reach 93.47% with the presence of force 9 wind. Furthermore, this study uses Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) to analyze the dust suppression mechanism of the developed dust suppressant. It is observed that a layer of compact hardened shell is formed at the surface of the coal powder treated with the newly developed dust suppressant. Also, there exists a strong cementing effect among dust particles, yielding a decent cementing performance. Therefore, the present dust suppressant can effectively suppress dust dispersion in the open-pit coal mines, allowing a mitigation of the environmental pollution.

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a novel environmentally friendly coal dust suppressant

Nie

J of Applied Polymer Sci

et al. 2018

Self Cite

“…Zhang [9] et al studied the law of dust and the distribution of dust concentration during the operation of a belt conveyor and proved the rationality of the Euler-Lagrangian method to simulate the distribution of dust in the roadway. Nie [10][11][12] et al studied the dust diffusion law through the CFD-DPM airflow coupling method. Du [13][14] et al used a computational fluid dynamics (CFD) model to study the law of dust movement and proposed corresponding control measures.…”

Section: Introductionmentioning

confidence: 99%

Study on Dust Migration Law and Spray Dedusting Technology in Parallel Double Belt Transportation

Jing

et al. 2022

Preprint

To effectively solve the problem of dust pollution caused by the parallel double-belt transportation of coal in a coal preparation plant, taking the Huangyuchuan coal preparation plant as an example, a numerical model of the air flow-dust distribution was established by means of simulation. The flow lines between the strips of tape and the tail of the tape machine will gather, and there will be backflow on the right side of the 3001 tape and left side of the 3002 tape. Under the action of wind current, most of the dust particles larger than 10 μm are distributed in the range of 0~5 m on both sides of the tape; dust particles smaller than 10 μm spread to the entire preparation workshop. Combined with field test verification, dust pollution is mainly concentrated at the guide trough, the feed inlet, the rear of the machine, and the joint of the belt corridor. Based on this, a targeted spray dust reduction treatment plan is proposed. By measuring the dust concentration before and after the treatment of dust-polluted areas, it is proven that the dust reduction efficiency of this plan can reach more than 90%.

“…Besides, as for coal piles, the dust dispersion can adversely impact the normal operation of electric and mechanical equipment as well as the monitoring system, leading to a shortened lifespan. More seriously, the increase of dust concentration can pose a major threat to operational safety, triggering the occurrence of accidents [13][14][15][16][17]. The traditional dust suppression methods include water spray and tarp coverage, which are unfavorable due to high cost and poor long-term dust suppression performance.…”

Section: Introductionmentioning

confidence: 99%

Development of Environmental Friendly Dust Suppressant Based on the Modification of Soybean Protein Isolate

Nie

et al. 2019

Processes

Self Cite

Aiming to further improve the dust suppression performance of the dust suppressant, the present study independently develops a new type of biodegradable environmentally-friendly dust suppressant. Specifically, the naturally occurring biodegradable soybean protein isolate (SPI) is selected as the main material, which is subject to an anionic surfactant, i.e., sodium dodecyl sulfonate (SDS) for modification with the presence of additives including carboxymethylcellulose sodium and methanesiliconic acid sodium. As a result, the SDS-SPI cementing dust suppressant is produced. The present study experimentally tests solutions with eight different dust suppressant concentrations under the same experimental condition, so as to evaluate their dust suppression performances. Key metrics considered include water retention capability, cementing power and dust suppression efficiency. The optimal concentration of dust suppressant solution is determined by collectively comparing these metrics. The experiments indicate that the optimal dust suppressant concentration is 3%, at which level the newly developed environmentally-friendly dust suppressant solution exhibits a decent dust suppression characteristic, with the water retention power reaching its peak level, and the corresponding viscosity being 12.96 mPa·s. This performance can generally meet the requirements imposed by coal mines. The peak efficiency of dust suppression can reach 92.13%. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to analyze the dust suppression mechanism of the developed dust suppressant. It was observed that a dense hardened shell formed on the surface of the pulverized coal particles sprayed with the dust suppressant. There is strong cementation between coal dust particles, and the cementation effect is better. This can effectively inhibit the re-entrainment of coal dust and reduce environmental pollution.