57 / 2023-05-15 22:19:54

Research on the Optimization Formula Performance and Dust Reduction Effect of Mine Dust Suppressant based on Response Surface Analysis

Dust suppressant; Single factor test; Compound solution; Response surface analysis; Performance characterization

The concentration of coal mine dust exceeding relevant national standards is the main cause of pneumoconiosis and explosions among coal miners. During underground mining, it is necessary to reduce the concentration of coal dust by adding dust suppressants. Currently, the dust reduction effect of chemical dust suppressants is not ideal, and the speed of wetting coal dust after spraying is slow. After achieving dust reduction, secondary dust is prone to occur, and further optimization is needed.In the single component experiment, four concentration gradient solutions of wetting agents were prepared to determine the settling time of the reagents on coal dust, two concentration gradient solutions of binders were prepared to determine the viscosity of the reagents, and three concentration gradient solutions of water retaining agents were prepared to determine the water absorption and water retention of the reagents. Based on this, the composite raw materials were selected: triton and sodium dodecylbenzene sulfonate as wetting agents, guar gum as binder, and sodium polyacrylate as water retaining agent, Determine the concentration level of the mixture test. In the mixing experiment, the design expert 13 software model was used for experimental design. Multiple experiments were conducted on the 15 given reagent formulations. Based on the performance data of the reagents in four factors: coal dust settling rate, water retention, surface tension, and dynamic contact angle, response surface analysis was conducted. The optimal ratio was determined to be sodium dodecylbenzene sulfonate: triton: guar gum: sodium polyacrylate=39:8:53:3.9:3.3. In the optimization formula characterization experiment, the dust suppressant was diluted with water to 0.1%. The infrared spectrum results indicate that the concentration of dust suppressants has a significant impact on the content of hydrophilic functional groups, hydroxyl groups, and hydrophobic ether bonds in coal dust. The results of scanning electron microscopy indicate that the dust suppressant has good wettability and adhesion to coal seams, and has strong encapsulation ability for coal dust. In the simulated sedimentation experiment, the initial dust concentration of the three groups of experiments of natural sedimentation, water spraying dust suppression and dust suppression agent spray dust suppression were 454.6 mg/m3, 431 mg/m3 and 410 mg/m3 respectively. The dust concentrations after 20 minutes of dust suppression were 149.0 mg/m3, 64.2 mg/m3, and 19.2 mg/m3, respectively. The dust reduction efficiency of the three methods is 67.2%, 85.1%, and 95.3%, respectively. The dust suppression efficiency of the dust suppression agent spray was 28.1% and 10.2% higher than that of natural sedimentation and water spray, respectively. The dust suppressant prepared in this study has practical value and can significantly improve the dust reduction efficiency in coal mines. The use of response surface analysis method for formula optimization opens up new ideas for the development of chemical dust suppressants.