矸石、粉煤灰高浓度料浆矸石颗粒悬浮性研究
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摘要
以新阳矿矸石、粉煤灰高浓度胶结充填料浆为研究对象,建立了充填料浆矸石颗粒悬浮态力学模型,分析了矸石颗粒悬浮状态的影响因素,认为调节高浓度料浆的塑性黏度和屈服应力是改善矸石颗粒悬浮性能、调节矸石颗粒悬浮状态最有效的手段;料浆实际配置中添加的悬浮剂正是通过提高料浆塑性黏度来提升矸石颗粒悬浮性,达到阻滞矸石下沉的目的。研究结果表明,悬浮剂使用量要适当,添加过多会影响料浆流动性,造成料浆输送阻力过大。新阳矿矸石、粉煤灰高浓度料浆黏度系数介于3.24～3.40 Pa·s,屈服应力介于107.9～111.9 Pa时,矸石颗粒基本处于悬浮状态,输送性较好。
This paper focus on the Xinyang coal gangue fly ash high concentration backfill slurry characteristics.The mechanic model was established to research the coal gangue suspension within the high concentration slurry and theoretical analysis was carried out to study the potential influence factors to the coal gangue suspension.The results show the most significant method to enhance the coal gangue suspension is to improve plastic viscosity and yield stress of the high concentration slurry.The suspending agent that employed in the slurry configuration is to enhance the slurry plastic viscosity,resulting in improving the coal gangue suspension characteristic and decreasing the coal gangue fall downward speed.The results reveal that the excessive amount of additive less the fluidity of the slurry,increase the slurry pipe transportation resistance.Coal gangue remains suspension characteristic in Xinyang high concentration slurry when the slurry viscosity range from 3.24 to 3.40 Pa·s while the slurry yield stress is between 107.9 to 111.9 Pa.At this level of rheology characteristics,the slurry is adequate to transport.
This paper focus on the Xinyang coal gangue fly ash high concentration backfill slurry characteristics.The mechanic model was established to research the coal gangue suspension within the high concentration slurry and theoretical analysis was carried out to study the potential influence factors to the coal gangue suspension.The results show the most significant method to enhance the coal gangue suspension is to improve plastic viscosity and yield stress of the high concentration slurry.The suspending agent that employed in the slurry configuration is to enhance the slurry plastic viscosity,resulting in improving the coal gangue suspension characteristic and decreasing the coal gangue fall downward speed.The results reveal that the excessive amount of additive less the fluidity of the slurry,increase the slurry pipe transportation resistance.Coal gangue remains suspension characteristic in Xinyang high concentration slurry when the slurry viscosity range from 3.24 to 3.40 Pa·s while the slurry yield stress is between 107.9 to 111.9 Pa.At this level of rheology characteristics,the slurry is adequate to transport.
引文
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[2] 杨宝贵,杨捷.煤矿充填技术发展趋势与选用方法[J]. 矿业研究与开发,2015,33(5):11-15. Yang Baogui,Yang Jie.The development trend and selection method of coal mine filling technology [J]. Mining Research and Development,2015,33(5):11-15.
[3] 徐文彬,杨宝贵,杨胜利,等.矸石充填料浆流变特性与颗粒级配相关性试验研究[J]. 中南大学学报:自然科学版,2016,47(4):1282-1289. Xu Wenbin,Yang Baogui,Yang Shenli,et al. Experimental study on correlativity between rheological parameters and grain grading of coal gauge backfill slurry[J]. Journal of Central South University :Science and Technology,2016,47(4):1282-1289.
[4] 杨宝贵.煤矿高浓度胶结充填开采技术[M]. 北京:煤炭工业出版社,2015.
[5] 姚维信,姚忠亮,刘洲基,等.高浓度大流量管输充填技术与工艺[M]. 北京:科学出版社,2014.
[6] 郭营.浓悬浮体表观流变特性与局部流动机理研究[D]. 上海,上海交通大学,2011.
[7] 刘晓辉.膏体流变性行为及其管流阻力特性研究[D]. 北京:北京科技大学,2014.
[8] 邹履泰.单颗粒在宾汉体中沉降规律的试验研究[J]. 泥沙研究,1989(4):76-83. Zou Lütai.Experimental study on settlement regularity of single particle in Bingham fluid[J] Sediment Research,1989(4):76-83.
[9] 张发爱.纤维素醚及其应用[J]. 化工新型材料,2001,29(11):21-23. Zhang Faai.Cellulose ethers and its application [J]. New Chemical Materials,2001,29(11):21-23.
[10] Frenkel D.Entropy-driven phase transitions[J]. Physica A:Statistical Mechanics and ITS Application,1999,263:26-38.