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Metal Mine ›› 2012, Vol. 41 ›› Issue (03): 6-9+14.

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Study on the Properties of the Unclassified Tailings Cemented Backfill Materials in a Mine

Sun Demin1,Ren Jianping1,Jiao Huazhe2,Hui Lin3   

  1. 1.China Nerin Engineering Co.,Ltd.;2.School of Civil and Environment Engineering,University of Science and Technology Beijing;3.Dongguashan Copper Mine of Tongling Nanferous Group
  • Online:2012-03-27 Published:2012-04-18

Abstract: The backfill system with classified tailings in a mine was in low efficiency with its complex process and the supply shortage of tailings.The test on tailings parameters was carried out,the four concentration sample slurry(66%,68%,70% and 72%)were prepared with 3 different dosage of cements(1∶〖KG-*2〗4,1∶〖KG-*2〗8,1∶〖KG-*2〗12)for the capability test of settlement,infiltration,concretion and strength.The results show that the physical characteristics of the tailings were the porosity 39.71%,natural rest angle 40°,average particle size 0.0497 mm,the tailings were finer,the water effusion rate by settlement was 6.39%~23.76%,and concentration increased by 1.81%~8.77%; Penetration speed of 0.25~0.36 cm/h; When cements dosage is 25%,the final concreted time of 26.2~23.9 h; while 12.5%,the concreted time of 41.4~40 h,the final concreted time does not exceed 2 h; the slump height of all samples were 24.9~26.8 cm,the slurry can flow better.The 28 d uniaxial compressive strength were 0.38~1.9 MPa.And the UCS was positive related with slurry concentration,the cements dosage.the suggested ratio was 12.5% cements dosage,backfill concentration was 70%~72% according to the require of mining methods on the concretion time and UCS.The results in the paper was coming to a standard for the determination of cemented fillings slurry performance made by unclassified tailings in similar mines.

Key words: Unclassified tailings, Cemented filling, Fillings performance, Adaptability