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    Rock Crushing Using Microwave Pre-Treatment

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    Type
    Conference Paper
    Authors
    Kim, Seunghee
    Santamarina, Carlos cc
    KAUST Department
    Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
    Earth Science and Engineering Program
    Energy Resources and Petroleum Engineering
    Physical Science and Engineering (PSE) Division
    Date
    2016-08-11
    Online Publication Date
    2016-08-11
    Print Publication Date
    2016-08-08
    Permanent link to this record
    http://hdl.handle.net/10754/622459
    
    Metadata
    Show full item record
    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.
    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
    DOI
    10.1061/9780784480151.071
    Additional Links
    http://ascelibrary.org/doi/10.1061/9780784480151.071
    ae974a485f413a2113503eed53cd6c53
    10.1061/9780784480151.071
    Scopus Count
    Collections
    Conference Papers; Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC); Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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