羟丙基甲基纤维素对煤矸石料浆性能的影响及机理研究

    Effects and mechanisms of hydroxypropyl methylcellulose on coal gangue slurry performance

    • 摘要: 羟丙基甲基纤维素(HPMC)能有效调节料浆性能,在水泥基材料中应用广泛。然而在煤矸石料浆领域,相关研究较少,且已有研究多局限于HPMC对煤矸石料浆宏观性能影响的初步探索,缺乏对其作用机理的系统解析。本文基于扩展度与沉降系数实验,系统研究了料浆宏观性能随料浆浓度、煤矸石粒径上限、HPMC掺量的演化规律,并结合扫描电子显微镜与偏光显微镜观测,揭示了HPMC作用机理。研究结果显示:料浆浓度、煤矸石粒径上限、HPMC掺量对扩展度与沉降系数均具有显著影响,影响程度排序为料浆浓度>煤矸石粒径上限>HPMC掺量;流动性损失率LA、LB、LC分别为1.12、0.87、0.69表明,分别通过改变料浆浓度、煤矸石粒径上限、HPMC掺量提高料浆的稳定性,对料浆流动性造成不利影响的大小排序为料浆浓度>煤矸石粒径上限>HPMC掺量,与调控浓度或改变煤矸石粒径上限的方式相比,HPMC的掺入使得浆体在保持高稳定性的同时,流动阻力的增幅显著降低,实现了稳定性与流动性的协同优化;优化后的料浆配比为:煤矸石粒径上限为2~3 mm、HPMC掺量为0.045%,料浆浓度为76%;细观结构分析显示,HPMC通过吸附架桥作用将离散细颗粒联结为三维絮网结构,该结构形成了贯穿料浆体系的“力学骨架”,有效抵消了粗颗粒沉降趋势,显著提升了料浆的稳定性。研究成果为煤矸石料浆的工程应用提供了理论支撑和优化依据。

       

      Abstract: Hydroxypropyl methylcellulose (HPMC) has proven effective in modifying slurry properties and is widely used in cement-based materials. However, research on HPMC application in coal gangue slurry remains limited, with existing studies primarily focusing on preliminary investigations of its macroscopic effects while lacking systematic analysis of its working mechanisms. This paper systematically investigates the evolution of slurry’s macroscopic properties with varying slurry concentration, gangue gradation, and HPMC dosage through slump flow and sedimentation coefficient tests. The mechanisms of HPMC are elucidated using scanning electron microscopy (SEM) and polarized light microscopy (PLM) observations. The results show that the slurry concentration, the upper limit of gangue particle size, and the HPMC dosage all have a significant impact on the fluidity and sedimentation coefficient. The degree of influence is ranked as follows: slurry concentration > upper limit of gangue particle size > HPMC dosage. The fluidity loss rates LA, LB, and LC are 1.12, 0.87, and 0.69, respectively, indicating that changing the slurry concentration, the upper limit of gangue particle size, and the HPMC dosage to improve the stability of the slurry have an adverse impact on the fluidity of the slurry in the order of slurry concentration > upper limit of gangue particle size > HPMC dosage. Compared with the methods of adjusting the concentration or changing the gradation, the addition of HPMC significantly reduces the increase in flow resistance while maintaining high stability, achieving a synergistic optimization of stability and fluidity. The optimized slurry ratio is as follows: the upper limit of gangue particle size is 2-3 mm, the HPMC dosage is 0.045%, and the slurry concentration is 76%. Mesostructure analysis shows that HPMC connects discrete fine particles into a three-dimensional flocculent network structure through adsorption bridging, which forms a “mechanical skeleton” throughout the slurry system, effectively counteracting the settlement trend of coarse particles and significantly improving the stability of the slurry. The research results provide theoretical support and optimization basis for the engineering application of coal gangue slurry.

       

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