Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (7): 1045-1050.DOI: 10.12068/j.issn.1005-3026.2016.07.028

• Resources & Civil Engineering • Previous Articles     Next Articles

Time-Varying Characteristic of Paste-like Super-Fine Unclassified Tailings in Long Self-Flowing Transportation

LI Shuai, WANG Xin-min, ZHANG Qin-li, WANG Shi   

  1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China.
  • Received:2014-11-21 Revised:2014-11-21 Online:2016-07-15 Published:2016-07-13
  • Contact: LI Shuai
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Abstract: A time-dependent rheological model was built based on the H-B rheological model and the slurry flocculent structure theory. Time-varying characteristic of paste-like super-fine unclassified tailings in long self-flowing transportation was explored, and the friction loss formula of pipes was derived. By using the 68% mass concentration paste-like slurry of a deep iron mine, groups of shear rheological tests were implemented, and the pipes friction loss was verified. It is revealed that the paste-like super-fine unclassified tailings show obvious shear thinning under different shear rate. The higher the shear rate is, the faster the balance can be reached and the lower the viscosity is. With a flow of 80m3/h, the friction loss takes 225s to reach a stable value of 5.03MPa/km, which is just 50.6% of the initial resistance. Therefore, it is quite economic and reasonable to calculate the friction loss of paste-like slurry by using the stable value in long distance pipeline transportation.

Key words: time-varying characteristic, H-B rheological model, flocculent structure theory, friction loss of pipes transportation, shear thinning

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