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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第10期    总第290期    2018年10月

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文章编号:1672-7207(2018)10-2519-07
基于环管实验的膏体流变特性及影响因素
王少勇,吴爱祥,阮竹恩,陈顺满

(北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京,100083)

摘 要: 为研究膏体的流变特性与影响因素,自主设计研发小型膏体环管实验平台,测试不同工况条件下膏体管道输送的τw-dv/dr流动曲线,并采用Hershel-Bulkey模型(简称H-B模型)进行回归分析,获得膏体管道输送的流变参数,分析水泥掺量、尾砂颗粒粒径及料浆质量分数对膏体屈服应力τ0、塑性黏度μ的影响。研究结果表明:膏体流变模型属于n<1,τ0>0屈服伪塑性体,用H-B模型描述更为精确,其屈服应力τ0和塑性黏度μ都随着膏体料浆的质量分数增加呈指数增加,随着水泥掺量的增加先增大后降低;膏体料浆质量分数一定的情况下,构成膏体的尾砂粒径越细,屈服应力越大,与尾砂的比表面积呈幂指数关系。

 

关键字: 环管实验;膏体;流变特性;屈服伪塑性体

Rheological properties of paste slurry and influence factors based on pipe loop test
WANG Shaoyong, WU Aixiang, RUAN Zhuen, CHEN Shunman

Key Laboratory of High-Efficient Mining and Safety of Metal, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China

Abstract:To study the rheological properties of paste slurry and influence factors, the mini pipe loop experiment platform was designed. τw-dv/dr rheological characteristic curves were drawn under different working conditions. The Hershel-Bulkey model (H-B model) was used for regression analysis, and the rheological parameters of the paste were obtained. The influences of the cement content and particle size of tailings and mass fraction of paste slurry on the yield stress τ0, plastic viscosity μ of the paste slurry were investigated. The results show that the rheological model of paste slurry is pseudo plastic fluid with n<1, τ0>0, and H-B model describes more precisely. The yield stress and plastic viscosity exponential function increase with the increase of mass fraction of paste slurry. With the increase of cement dosage, the yield stress and plastic viscosity first rise and then drop. Keeping constant mass fraction of paste slurry, the diameter of the tailings of the paste is smaller and the yield stress is greater, and the yield stress power exponent increase with the increase of specific surface area of tailings.

 

Key words: pipe loop test; paste slurry; rheological properties; pseudo plastic fluid

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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