Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第31卷    第2期    总第263期    2021年2月

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文章编号:1004-0609(2021)-02-0510-10
尾矿膏体流变特性和管输阻力计算模型
侯永强1, 2 ,尹升华1, 2,戴超群1, 2,曹 永1, 2

(1. 北京科技大学 土木与资源工程学院,北京 1000083;
2. 金属矿山高效开采与安全教育部重点实验室,北京 100083
)

摘 要: 为探究不同浓度下的尾矿膏体流变特性行和管输阻力计算模型,在实验室开展了不同料浆浓度的尾矿膏体流变试验及坍落度试验。结果表明:料浆的屈服应力和塑性黏度随着浓度的增加均呈不断增大的趋势;结合模型的拟合结果可知,屈服应力随着料浆浓度(质量分数,%)的增加遵循二次函数递增规律,而塑性黏度随着料浆浓度的增加遵循指数函数递增规律;当料浆浓度低于70%时,充填料浆具有可观的流动性,且流变参数与坍落度具有一定的关联性。采用了四种拟合模型对坍落度与流变参数之间的关系进行拟合分析,发现料浆的屈服应力和塑性黏度随着坍落度的增大遵循Logistic函数递减规律;通过构建的料浆浓度、坍落度与流变参数值之间的数学模型,建立了基于料浆浓度或坍落度的管道输送阻力计算模型;以金川二矿区为工程背景验证了新管道输送阻力计算模型的准确性,表明采用料浆浓度或塌落度去替代流变参数计算管道输送阻力值是可靠的。

 

关键字: 流变特性;尾砂;屈服应力;管输阻力;塑性黏度

Rheological properties and pipeline resistance calculation model in tailings paste
HOU Yong-qiang1, 2, YIN Sheng-hua1, 2, DAI Chao-qun1, 2, CAO Yong1, 2

1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 1000083, China;
2. Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China

Abstract:In order to explore the rheological properties and the pipeline resistance calculation model of the tailings paste at different concentrations, the rheological tests and slump tests of different slurry concentrations were carried out in the laboratory. The results show that the yield stress and plastic viscosity of the slurry increase with increasing slurry concentration. According to the fitting results of the model, it can be known that the yield stress follows an increasing function of the quadratic function as the slurry concentration(mass fraction,%) increases, and the plastic viscosity follows an exponential function as the slurry concentration increases. When the slurry concentration is lower than 70%, the filler slurry has considerable fluidity, and there is a certain correlation between the rheological parameters and the slump. Four fitting models are used to fit and analyze the relationship between slump and rheological parameters, and it is obtained that the yield stress and plastic viscosity of the slurry follow the law of decreasing logistic function as the slump increases. Based on the mathematical model of slurry concentration, slump and rheological parameters, a pipeline resistance calculation model based on slurry concentration or slump is established. Taking Jinchuan No.2 mining area as the engineering background, the accuracy of the new pipeline resistance calculation model is verified, showing that it is reliable to use the slurry concentration or slump to replace the rheological parameters for calculating the pipeline resistance.

 

Key words: rheological property; tailings; yield stress; pipe resistance; plastic viscosity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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