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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (4): 33-38.doi: 10.11872/j.issn.1005-2518.2017.04.033

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Shearing Thinning Behavior of High Concentration Slurry Based on Bingham Model

LI Zongnan，GUO Lijie，YU Bin，SHI Caixing   

  1. Beijing General Research Institute of Mining and Metallurgy，Beijing    100160，China
  • Received:2017-01-12 Revised:2017-04-26 Online:2017-08-30 Published:2017-10-30

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Abstract:

 The activation agitation of high concentration tailings slurry is an important research subject in mine filling technology.High speed stirring is an effective way to destroy the “micro aggregate” in the filling slurry，which can improve the rheological properties and transportability of the filling slurry.High speed stirring means that the filling slurry was sheared rapidly.Different mixing energy，which corresponding to different shear rates，can lead to different physical and chemical properties of filling slurry.To get the law of this phenomenon and find out the best activation energy for high concentration tailings slurry，a kind of copper ore tailing slurry with a mass concentration of 70% has been prepared，stirring tests with different shear rates were carried out by a laboratory blender branded Xinnuo AM300S-H，rheological parameters were tested by Broofield R/S-CCT rheometer，shearing thinning behavior was analyzed based on Bingham model.It is shown that with the agitation speed (n) raised，the viscosity(ηb) and yield-shear-stress(τ0) decreased，showing an obvious shearing thinning behavior.However，the yield shear stress tends to be stable when the stirring speed beyond 400 r/min.It was found that the relation of viscosity and agitation speed can be expressed as ηb=0.3n-0.1 when the stirring speed between 120 r/min and 1 000 r/min.

Key words: shearing thinning, Bingham model, viscosity, yield shearing stress, activation agitation, high con- centration tailing mortar

CLC Number: 

  • TD853 

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