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Title: Field investigation of evaporation from freshwater tailings

Abstract

Safe and economical storage of tailings is now a major consideration in the operation of many mining operations. Tailings in slurried form, particularly if they have a significant clay content, can take a very long time to consolidate under the action of self-weight consolidation alone. However, if the operation is located in an area of high potential evaporation, this can be used to accelerate the rate of tailings densification. This paper presents a study of the evaporation behavior of a clayey tailings slurry deposited into an evaporation pond in the southwest of Western Australia. Over a six-month period, the rate of evaporation from the tailings surface was monitored using the Bowen Ratio method and the microlysimeter method. This was compared with the evaporation from a Class A pan located nearby. The tailings underwent very significant cracking as drying proceeded, and it was found that these cracks had a significant influence on the overall rate of evaporation once the top surface of the deposit started to desaturate. A large strain consolidation model was used to model the behavior, and the algorithm used in this model to include the effects of evaporation is shown to provide a reasonable prediction of the observedmore » evaporation behavior.« less

Authors:
; ;
Publication Date:
Research Org.:
Kiso-Jiban Singapore Pte Ltd. (SG)
OSTI Identifier:
20076048
Alternate Identifier(s):
OSTI ID: 20076048
Resource Type:
Journal Article
Journal Name:
Journal of Geotechnical and Geoenvironmental Engineering
Additional Journal Information:
Journal Volume: 126; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 1090-0241
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; SETTLING PONDS; EVAPORATION; TAILINGS; STORAGE; WESTERN AUSTRALIA; MATHEMATICAL MODELS; WASTE MANAGEMENT; MINERAL INDUSTRY

Citation Formats

Fujiyasu, Yoshimasa, Fahey, M., and Newson, T. Field investigation of evaporation from freshwater tailings. United States: N. p., 2000. Web. doi:10.1061/(ASCE)1090-0241(2000)126:6(556).
Fujiyasu, Yoshimasa, Fahey, M., & Newson, T. Field investigation of evaporation from freshwater tailings. United States. doi:10.1061/(ASCE)1090-0241(2000)126:6(556).
Fujiyasu, Yoshimasa, Fahey, M., and Newson, T. Thu . "Field investigation of evaporation from freshwater tailings". United States. doi:10.1061/(ASCE)1090-0241(2000)126:6(556).
@article{osti_20076048,
title = {Field investigation of evaporation from freshwater tailings},
author = {Fujiyasu, Yoshimasa and Fahey, M. and Newson, T.},
abstractNote = {Safe and economical storage of tailings is now a major consideration in the operation of many mining operations. Tailings in slurried form, particularly if they have a significant clay content, can take a very long time to consolidate under the action of self-weight consolidation alone. However, if the operation is located in an area of high potential evaporation, this can be used to accelerate the rate of tailings densification. This paper presents a study of the evaporation behavior of a clayey tailings slurry deposited into an evaporation pond in the southwest of Western Australia. Over a six-month period, the rate of evaporation from the tailings surface was monitored using the Bowen Ratio method and the microlysimeter method. This was compared with the evaporation from a Class A pan located nearby. The tailings underwent very significant cracking as drying proceeded, and it was found that these cracks had a significant influence on the overall rate of evaporation once the top surface of the deposit started to desaturate. A large strain consolidation model was used to model the behavior, and the algorithm used in this model to include the effects of evaporation is shown to provide a reasonable prediction of the observed evaporation behavior.},
doi = {10.1061/(ASCE)1090-0241(2000)126:6(556)},
journal = {Journal of Geotechnical and Geoenvironmental Engineering},
issn = {1090-0241},
number = 6,
volume = 126,
place = {United States},
year = {2000},
month = {6}
}