Journal of Central South University of Technology

, Volume 15, Issue 6, pp 801–807 | Cite as

Cemented backfilling technology with unclassified tailings based on vertical sand silo

  • Xin-min Wang (王新民)Email author
  • Bin Zhao (赵彬)
  • Qin-li Zhang (张钦礼)
  • Dong-sheng Xu (徐东升)


A new technology characterized by rapidly non-mechanical settlement of unclassified tailings was developed based on a large number of tests, and dynamic settlement and continual slurry preparation without hardening in vertical sand silo were eventually realized by the addition of an effective flocculating agent (NPA). The results show that the sedimentation velocity of interface between unclassified tailings and water after the addition of NPA increases by 10–20 times, the sedimentation mass fraction of unclassified tailings at the bottom of vertical sand silo is up to 64%, the solid particle content of waste water meets the national standard, and the side influences of NPA can be removed by the addition of fly ash. The industrial test result shows that the system, the addition manner and the equipments are rational, and the vertical sand silo is used efficiently. This developed system is simple with large throughput, and the processing cost is 2.2 yuan(RMB)/m3, only 10%–20% of that by mechanical settlement.

Key words

vertical sand silo unclassified tailings flocculating agent settlement concentration industrial test 


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Copyright information

© Central South University Press and Springer-Verlag GmbH 2008

Authors and Affiliations

  • Xin-min Wang (王新民)
    • 1
    Email author
  • Bin Zhao (赵彬)
    • 1
  • Qin-li Zhang (张钦礼)
    • 1
  • Dong-sheng Xu (徐东升)
    • 2
  1. 1.School of Resources and Safety EngineeringCentral South UniversityChangshaChina
  2. 2.Wuhan Institute of Rock and Soil ResearchChinese Academy of ScienceWuhanChina

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