Rock Crushing Using Microwave Pre-Treatment

Handle URI:
http://hdl.handle.net/10754/622459
Title:
Rock Crushing Using Microwave Pre-Treatment
Authors:
Kim, Seunghee; Santamarina, Carlos ( 0000-0001-8708-2827 )
Abstract:
Crushing and grinding are primary contributors to a high energy demand in the mining industry, yet, both are surprisingly inefficient processes, often with efficiencies as low as 1%. We analyze size reductions during crushing and grinding operations and explore the potential of multiplying internal weaknesses in rock materials by non-mechanical means. In particular, when rock blocks (wet or even dry if polycrystalline) are exposed to microwaves, internal cracks can develop along grain boundaries via differential thermal expansion between grains and volumetric thermal expansion of water in pores. Brazilian tests conducted on granite and cement mortar specimens show that the tensile strength decreases proportional to the duration of microwave treatment. Thermal changes, excessive fluid pressure buildup and induced stresses are analyzed in the context of hydro-Thermo-mechanically coupled processes. Results confirm that both differential thermal expansion of mineral grains and volumetric thermal expansion of water can generate cracks upon microwave exposure. Optimal conditions are suggested to lower the combined consumption of electric and mechanical energy.
KAUST Department:
King Abdullah Univ. of Science and Technology (KAUST), Thuwal, Saudi Arabia
Citation:
Kim S, Carlos Santamarina J (2016) Rock Crushing Using Microwave Pre-Treatment. Geo-Chicago 2016. Available: http://dx.doi.org/10.1061/9780784480151.071.
Publisher:
American Society of Civil Engineers (ASCE)
Journal:
Geo-Chicago 2016
Conference/Event name:
4th Geo-Chicago Conferen Sustainable Materials and Resource Conservation, Geo-Chicago 2016
Issue Date:
11-Aug-2016
DOI:
10.1061/9780784480151.071
Type:
Conference Paper
Additional Links:
http://ascelibrary.org/doi/10.1061/9780784480151.071
Appears in Collections:
Conference Papers

Full metadata record

DC FieldValue Language
dc.contributor.authorKim, Seungheeen
dc.contributor.authorSantamarina, Carlosen
dc.date.accessioned2017-01-02T09:28:32Z-
dc.date.available2017-01-02T09:28:32Z-
dc.date.issued2016-08-11en
dc.identifier.citationKim S, Carlos Santamarina J (2016) Rock Crushing Using Microwave Pre-Treatment. Geo-Chicago 2016. Available: http://dx.doi.org/10.1061/9780784480151.071.en
dc.identifier.doi10.1061/9780784480151.071en
dc.identifier.urihttp://hdl.handle.net/10754/622459-
dc.description.abstractCrushing and grinding are primary contributors to a high energy demand in the mining industry, yet, both are surprisingly inefficient processes, often with efficiencies as low as 1%. We analyze size reductions during crushing and grinding operations and explore the potential of multiplying internal weaknesses in rock materials by non-mechanical means. In particular, when rock blocks (wet or even dry if polycrystalline) are exposed to microwaves, internal cracks can develop along grain boundaries via differential thermal expansion between grains and volumetric thermal expansion of water in pores. Brazilian tests conducted on granite and cement mortar specimens show that the tensile strength decreases proportional to the duration of microwave treatment. Thermal changes, excessive fluid pressure buildup and induced stresses are analyzed in the context of hydro-Thermo-mechanically coupled processes. Results confirm that both differential thermal expansion of mineral grains and volumetric thermal expansion of water can generate cracks upon microwave exposure. Optimal conditions are suggested to lower the combined consumption of electric and mechanical energy.en
dc.publisherAmerican Society of Civil Engineers (ASCE)en
dc.relation.urlhttp://ascelibrary.org/doi/10.1061/9780784480151.071en
dc.titleRock Crushing Using Microwave Pre-Treatmenten
dc.typeConference Paperen
dc.contributor.departmentKing Abdullah Univ. of Science and Technology (KAUST), Thuwal, Saudi Arabiaen
dc.identifier.journalGeo-Chicago 2016en
dc.conference.date2016-08-14 to 2016-08-18en
dc.conference.name4th Geo-Chicago Conferen Sustainable Materials and Resource Conservation, Geo-Chicago 2016en
dc.conference.locationChicago, IL, USAen
dc.contributor.institutionWestern New England Univ., 1215 Wilbraham Rd, Springfield, MA, United Statesen
kaust.authorSantamarina, Carlosen
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