Selective Heat Ore Treatment

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Jan 28 2020, 12pm EST

Join us Jan 28th for a free webinar to explain the benefits of S.H.O.T and how it can reduce your ore competency leading to less comminution energy, higher mill throughput, less grinding media consumption, and less liner wear. S.H.O.T. also will enhance your liberation with the current grind size or a coarser grind size.

Natural Resources Canada (NRCan) is funding the development of technologies that can result in a transformational reduction in energy usage in grinding and milling mined ores. The applicants were challenged to demonstrate a 20% or better reduction in comminution energy, compared to an established baseline.

S.H.O.T. (Selective Heat Ore Treatment) S.H.O.T. applies a short burst of high-intensity microwave energy to induce thermal stresses primarily at the mineral-grain interface. Since ore is weak in tension, even small thermal stresses create micro-fractures at the mineral-grain boundaries. Selective breakage around grain boundaries rather than random breakage across grains more easily frees the valuable mineral at a larger grain size from competent waste rock around it, thereby enhancing recovery.

Our consortium has proven at large laboratory scale (150 t/hr continuous flowrate) that SHOT treating ore can exceed the expectations of the Crush It! Challenge. SHOT treatment has been shown to deliver the following comminution benefits on a porphyry copper ore at energy inputs of 0.3-3 kWh/t:

  • A minimum reduction of 24% in specific comminution energy and a throughput increase of up to 30%
  • A reduction in: comminution A ∗ b values by up to 7–14%, and the Bond Ball Mill Work Index by up to 3–9%
  • Equivalent liberation at a grind size approximately 40–70 μm coarser than untreated ore, thus resulting in reduced specific energy consumption and increased throughput


Tracy Holmes P.Eng., is President and Senior Project Engineer at Jenike & Johanson Ltd. She received her B.A.Sc. in Civil Engineering from the University of Waterloo in Ontario. She specializes in the design and evaluation of bulk solids handling systems. Since joining JJL in 1994, she has provided consulting services to a broad spectrum of national and international clients, troubleshooting and recommending corrective actions for flow problems, providing recommendations to avoid solid flow related problems in new installations, as well as designing customized handling equipment related to this field. In addition, she has hands-on experience and knowledge of measuring the flow properties of bulk solids.

She frequently lectures on at J&J and directly for clients, as well as through organizations such as Powder & Bulk Solids, American Institute of Chemical Engineers, (AIChE) and Educational Program Innovation Center (EPIC).

She has co-authored and presented technical papers on subjects including reliable bulk solids handling, effective bin and feeder design, shipping of fine moist cargoes, and silo structural failures and maintenance. Her papers have been published in periodicals including Powder & Bulk Engineering, World Coal, and the CIM Journal. She has lectured at mining conferences such as Canadian Mineral Processors (CMP), the Society for Mining, Metallurgy, and Exploration Inc. (SME), and the International Mineral Processing Congress (IMPC).


Professor Sam Kingman is a Pro-Vice-Chancellor at the University of Nottingham He was awarded a personal chair at Nottingham in 2006, which at the time made him the youngest full Engineering Professor in the UK. He was previously the Director of the National Centre for Industrial Microwave Processing (NCIMP) which was one of the largest activities of its type in the world. In the past 12 years, Professor Kingman has published over 175 refereed journal papers and he is an inventor on over 150 patents within 29 patent families in the field of industrial microwave processing. In 2008, the work of the Professor Kingman and his group was recognised through the award of The Engineer Technology and Innovation Prize for Environmental Technology and the Environmental Prize of the Society of Petroleum Engineers and in 2011 Professor Kingman was awarded the Bielby Medal by the Royal Society of Chemistry, Society of Chemical Industries and the Institute of Materials, Minerals and Mining for his work to reduce energy consumption in chemical processing. Other prestigious awards include the Institution of Chemical Engineers Energy Prize in 2012 for work in microwave processing of industrial minerals and the UK Medal for Excellence in Engineering (2001). Microwave processing research at Nottingham has also been recognised by the award of the 2009 Environmental prize by the Society of Petroleum Engineers. In 2018 Professor Kingman led the team that was awarded the Colin Campbell Mitchell Award from the Royal Academy of Engineering, which was awarded for having made the greatest contribution to the advancement of any field of engineering within the period of the four years prior to the making of the award. Professor Kingman has presented numerous international invited and keynote lectures including a Friday Evening Discourse at The Royal Institution of Great Britain a lecture series first delivered in 1826 by Michael Faraday and whose other presenters have included Dorothy Hodgkin, Alexander Fleming, JJ Thomson, Gugliemo Marconi and Ernest Rutherford.

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