新疆褐煤疏水改性提高其成浆性能

针对新疆褐煤具有较高内水的问题,制备了阴离子AKD改性剂和非离子AKD改性剂,对褐煤颗粒进行疏水改性。研究了改性前后煤粒表面化学成分、孔隙分布、亲疏水性和Zeta电位等煤粒表面特性,并结合NSF分散剂在改性前后煤粒表面吸附量大小,探讨了改性前后褐煤水煤浆的成浆性、流变性和稳定性。结果表明,改性后煤粒孔隙结构降低,煤粒表面碳的相对含量增加,氧的相对含量降低,煤水界面接触角增加,煤粒疏水性能增强。NSF分散剂在改性煤表面吸附量增加,煤粒表面负电性增强。由阴离子AKD改性煤、非离子AKD改性煤制备的水煤浆最大成浆质量分数从原煤56.6%分别增加至61.0%、62.5%,浆体析水率从原煤13.97%分别降低至7.45%、7.89%,同时改性后煤粒制备的浆体均表现出剪切变稀的假塑性流体。因此,改性煤粒更容易制备高浓度、低黏度、高稳定性且易于储存和运输的水煤浆。

Hydrophobic modification of Xinjiang lignite to improve its slurryability

The abundant pore structure and large number of oxygen-containing groups cause high water content of lignite, which limit its efficient utilization. In this paper, high concentration, low viscosity and high stability coal water slurry was prepared by hydrophobic modification of low rank coal to make it have the property of high rank coal. Using anionic surfactant sodium stearate and nonionic surfactant OP-10 as emulsifier emulsified alkyl ketene dimer (AKD), anionic AKD modifier and non-ionic AKD modifier were prepared, which were coated on the surface of microwave drying coal to improve the hydrophobic properties of coal particles. The surface properties of coal particles before and after modification such as chemical composition, pore distribution, hydrophobic properties and Zeta potential were studied. Combined with the adsorption results of NSF dispersant on the surface of coal particles before and after modification, the slurryability, rheology and stability of lignite coal water slurry were discussed. It is found that surface of the modified coal particles has higher carbon content and lower oxygen content, while their pore volumes are reduced, the contact angles of coal-water interface are increased, and hydrophobicity of the coal particles is enhanced. The adsorption capacity of NSF dispersant on surface of modified coal increases, which makes the surface electronegativity of coal particles increases, and coal particles have better dispersion effect in water. The maximum concentrations of CWS prepared by anionic AKD modified coal and non-ionic AKD modified coal increase from 56.6% of raw coal to 61.0% and 62.5% respectively, and the water evolution rates of CWS decrease from 13.97% of raw coal to 7.45% and 7.89% respectively. At the same time, the CWS prepared by modified coal particles show shear-thinning pseudoplastic fluid. Overall, the physical and chemical properties of coal particles have significantly changes after modification, and high-quality slurry fuels with high solid concentration, superior pseudo-plastic behavior, and good stability are easier to be prepared.