分级添加矸石颗粒的充填浆料流变学特性研究

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中文摘要：煤矸石是矿山开采后遗留的固体废物,传统的测坍落度已无法解决煤矸石基充填料浆泵送过程出现的离析、堵管等问题.为此,通过Herschel-Bulkley模型拟合流变曲线,对屈服应力、表观黏度和流变特征等进行系统分析,研究了 Talbol连续级配下分级添加矸石颗粒的矸石充填料浆流变学参数变化规律及影响因素.结果表明:1)小粒径范围内连续级配浆料"絮网结构"承载性能更好,非连续级配中大颗粒的配位数比小粒径大,屈服应力更高;2)添加0.5、0.5～1 mm矸石颗粒后,料浆"絮网结构"存在一个临界最大值,是更大粒径矸石颗粒实现悬浮的基础;3)"絮网结构"的承载性能随矸石粒径的增大而减小,表观黏度随剪切速率变化呈现先减小再增加后趋于平缓;4)当y＜50s-1时,料浆状态呈现剪切稀化或近牛顿流体状态,更易于搅拌和输送.该研究为矿山矸石充填料浆管道输送提供了借鉴.

外文标题：Study on the Rheological Characteristics of Backfill Slurry with Graded Addition of Gangue Particles

外文摘要：Coal gangue is a solid waste left over after mining operations,the traditional slump measurement has not been able to solve the pumping process of coal gangue-based cemented paste backfill(GCPB)slurry segregation,plugging and other problems.The Herschel-Bulkley(H-B)model was chosen to fit the rheological curves,and the rheological parameters such as yield stress,apparent viscosity and rheological characteristics were analyzed to study the changes of rheological parameters and influencing factors of GCPB slurry with graded addition of gangue particles under continuous gradation of Talbol theory in this paper.The experimental results showed that,1)the load-bearing performance of continuous graded slurry"flocculent network structure"was better in the range of small particle size,and the coordination number of large particles in discontinuous graded slurry was larger than that of small particle size,and the yield stress was higher,2)after adding 0.5,0.5-1 mm gangue particles,the slurry"flocculent network structure"there was a critical maximum,which was larger size gangue particles to achieve the basis of suspension,3)"flocculent network structure"load-bearing performance with the increase of gangue particle size and decrease,apparent viscosity varies with shear rate,showing a pattern of decreasing,then increasing and then leveling off,4)when γ＜50 s-1,the slurry state presented shear thinning or near Newtonian fluid state,easy to mix and transport.The study provides a reference for mine GCPB slurry pipeline conveying.

外文关键词：

coal gangue-based cemented paste backfillHerschel-Bulkley modelyield stressapparent viscosityrheological characteristics

作者：

张慧峰、鲁成、张思达、刘凌云

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作者单位：

陕西煤业化工集团陕西小保当矿业有限公司,陕西榆林 719302

陕西天地地质有限责任公司,西安 710054

关键词：

矸石充填 Herschel-Bulkley模型屈服应力表观黏度流变特征

基金：

陕西省重点研发计划一般项目陕西省煤田地质集团重大专项项目陕西省煤田地质集团创新能力支撑计划项目

项目编号：

2024SF-YBXM-622SMDZ-2022ZD-1SMDZ-2023CX-18

出版年：

2024

DOI：

10.3969/j.issn.2095-1744.2024.10.015

有色金属工程

北京矿冶研究总院

有色金属工程

CSTPCD北大核心

影响因子：0.432

ISSN：2095-1744

年,卷(期)：2024.14(10)