PMID- 23220652
OWN - NLM
STAT- MEDLINE
DCOM- 20130816
LR  - 20130204
IS  - 1095-8630 (Electronic)
IS  - 0301-4797 (Linking)
VI  - 115
DP  - 2013 Jan 30
TI  - Effect of desliming of sulphide-rich mill tailings on the long-term strength of 
      cemented paste backfill.
PG  - 5-13
LID - S0301-4797(12)00599-3 [pii]
LID - 10.1016/j.jenvman.2012.11.014 [doi]
AB  - This paper presents the effect of desliming on the short- and long-term strength, 
      stability and rheological properties of cemented paste backfill (CPB) produced 
      from two different mill tailings. A 28-day unconfined compressive strength (UCS) 
      of >/=1.0 MPa and the maintenance of stability over 224 days of curing were 
      selected as the design criteria for the evaluation of paste backfill performance. 
      Desliming induced some changes in the physical, chemical, mineralogical and 
      rheological properties of the tailings. CPB mixture of the deslimed tailings 
      achieved the required consistency at a lower water to cement ratio. The 
      short-term UCSs of CPB samples of the deslimed tailings were found to be 30-100% 
      higher than those samples of the reference tailings at all the binder dosages and 
      curing times. CPB samples of the deslimed tailings achieved the long-term 
      stability at relatively low binder dosages (e.g. 5 wt% c.f. >/=6.1% for the 
      reference tailings). It was also estimated that desliming could allow a 
      13.4-23.1% reduction in the binder consumption depending apparently on the 
      inherent characteristics of the tailings. Over the curing period, generation of 
      sulphate and acid by the oxidation of pyrite present in the tailings was also 
      monitored to correlate with the strength losses observed in the long term. 
      Scanning electron microscope (SEM) and Mercury Intrusion Porosimetry (MIP) 
      analyses provided an insight into the microstructure of CPB and the formation of 
      secondary mineral phases (i.e. gypsum) confirming the beneficial effect of 
      desliming. These findings suggest that desliming can be suitably exploited for 
      CPB of sulphide-rich mill tailings to improve the strength and stability 
      particularly in the long term and to reduce binder consumption.
CI  - Copyright (c) 2012 Elsevier Ltd. All rights reserved.
FAU - Ercikdi, Bayram
AU  - Ercikdi B
AD  - Department of Mining Eng., Karadeniz Technical University, 61080 Trabzon, Turkey. 
      bercikdi@ktu.edu.tr
FAU - Baki, Hakan
AU  - Baki H
FAU - Izki, Muhammet
AU  - Izki M
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20121207
PL  - England
TA  - J Environ Manage
JT  - Journal of environmental management
JID - 0401664
RN  - 0 (Industrial Waste)
RN  - 0 (Sulfides)
SB  - IM
MH  - Construction Materials/*analysis
MH  - Industrial Waste/analysis
MH  - Microscopy, Electron, Scanning
MH  - *Mining
MH  - Sulfides/*chemistry
EDAT- 2012/12/12 06:00
MHDA- 2013/08/21 06:00
CRDT- 2012/12/11 06:00
PHST- 2012/07/16 00:00 [received]
PHST- 2012/10/22 00:00 [revised]
PHST- 2012/11/05 00:00 [accepted]
PHST- 2012/12/11 06:00 [entrez]
PHST- 2012/12/12 06:00 [pubmed]
PHST- 2013/08/21 06:00 [medline]
AID - S0301-4797(12)00599-3 [pii]
AID - 10.1016/j.jenvman.2012.11.014 [doi]
PST - ppublish
SO  - J Environ Manage. 2013 Jan 30;115:5-13. doi: 10.1016/j.jenvman.2012.11.014. Epub 
      2012 Dec 7.