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SAIMM News

  • Reliability Best practices and Benchmarking Survey: Please share your views

    Image result for gmsghttps://www.surveymonkey.com/r/ReliabilityKPIs

    You are invited to participate in a survey focused on prioritizing collaboration around Reliability Best Practices and Benchmarking. If you’re not the correct person within your organization, please pass this invitation to the appropriate person. Survey deadline is October 31.

    The Reliability Working Group (RWG) of the Global Mining Standards and Guidelines Group is an operator focused group whose purpose is to promote knowledge and best practices sharing related to reliability in a mining context.

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  • We are excited to announce that the SAIMM Online Journal system is now live!

    saimm journal sept2017You can now submit manuscripts and peer reviews online. The OJS assists you with every step of the refereed publishing process, from submission through to online publication. Authors can also check the status of their papers online and referees will receive automated reminders for their reviews.
    We request you to register as an Author and/or Referee on the system.  To access the website please follow the link: http://saimmjournal.co.za/

     

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  • The INTPART Metal Production Project

    INTPARTThe INTPART Metal Production Project aims at strengthening ties and growing networks internationally through joint research and education projects. The three-year project is hosted by the Centre for Research-based Innovation (SFI) and funded by the Norwegian Research Council (NRC) and NTNU. The participating institutions are NTNU and SINTEF in Norway, and MINTEK and the University of North-West (NWU) in South Africa. The two focus areas of the project are fundamental reaction mechanisms for reduction processes and the use of carbon materials in metal production.

    The project resulted from the two SAIMM Schools on Manganese Ferroalloy Production hosted in 2012 and 2016.

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From the President's Corner

  • The last 100 days in the office of the SAIMM Presidency

    When presidents or leaders are elected, it is often customary to expect them to deliver a speech when they attain their first 100 days in office. Barack Hussein Obama was inaugurated on 20 January 2009 as the 44th President of the United States, and gave a speech on his first 100 days in office on 29 April 2009. As is

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  • The modern mining professional – a mining CEOʼs perspective

    I had the opportunity of attending the Annual General Meeting of the Association of Mine Managers of South Africa (AMMSA) on 31 March 2017. Mr Steve Phiri, the Chief Executive Officer of Royal Bafokeng Platinum (RBPlat) delivered the keynote address, which he titled ‘Towards a lasting legacy: the modern mine manager’. This insightful address resonated with my President’s Corner in

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  • Mine of the Future — A mining CEOʼs perspective

    The School of Mining Engineering at the University of the Witwatersrand held its 120th anniversary celebration on 23 March 2017. The keynote speaker at this momentous occasion was the Chief Executive Officer (CEO) of Gold Fields Limited, Mr Nick Holland. He spoke passionately about his vision on the Mine of the Future and indicated how Gold Fields was positioning itself

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  • Advancing international collaboration through the Global Mineral Professionals Alliance (GMPA)

    When Finance Minister Pravin Gordhan was delivering his mid-term budget speech in 2016, he made reference to the following Pedi quote which is relevant to one of SAIMM’s strategic initiatives: ‘Ditau tsahloka seboka di shitwa ke nare e hlotsa’ (translated into English as ‘Lions that fail to work as a team will struggle to bring down even a limping buffalo’).

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Jobs

From the Journal Comments

  • Hydrometallurgy Conference 2016

    ʻSustainable Hydrometallurgical Extraction of Metalsʼ This edition of the Journal features papers that were presented at the Hydrometallurgy Conference, which was held from 31 July to 3 August 2016. The theme of the conference was ‘Sustainable Hydrometallurgical Extraction of Metals’ and it was attended by 150 delegates from around the world. The conference was organized in collaboration with the Western

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  • We have a Problem?

    I start my Journal Comment with the iconic phrase: ‘Houston, we have a problem’. Those with good memories might just recall that these were the words spoken by astronaut Jack Swigert during the aborted Apollo 13 moon mission, when he reported to ground control an undervoltage on the capsule bus. At least that’s what I recall he said. Something in

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2008 Presidential address: How cool are refractory materials?

A._Garbers-CraigBy A.M. Garbers-Craig
Without refractory materials most of the scientific and technological inventions and developments we know today would not have been possible. The existence of virtually everything we see around us, or use in everyday life, is in some way dependent on refractory materials. Refractories are therefore facilitating or enabling materials, and are essential to the successful operation of any industry in which high temperatures are used .
The word ‘refractory’ is derived from the Latin word, ‘refractarius’, which means stubborn . These materials resist high temperatures, have high-quality mechanical and thermomechanical properties, have high corrosion resistance, act as a heat buffer between the walls of the containing vessel and the hot charge, and conserve process heat.
Reliability and long service life are required from materials when put into operation. Refractory cost is therefore expressed in terms of tons of product produced, i.e. the cost of the refractory material is weighed against useful life and replacement cost. A refractory material is a type of engineering ceramic called an ‘industrial ceramic’ . Refractory materials, however, have
coarser grain sizes and higher porosities than engineering ceramics, and consist of aggregate particles, held together by a bonding (matrix) phase, where both the aggregate and the bond can be multiphased .
Download the full PDF here... The particle size distributions are carefully controlled in order to control the microstructure, which directly influences porosity and density, strength, load-bearing capacity, corrosion resistance and thermal shock resistance . A huge range of types of refractory materials, with a variety of intricate microstructures and phase assemblages, is commercially available.
Refractory materials are mostly oxide based materials, but they are becoming increasingly composite materials, which also contain non-oxide components such as graphite, SiC, resin and metallic particles .
When refractories are classified on the basis of composition, a distinction can be made (according to the ISO [International Standards Organization Committee] classification)
between basic, non-basic (or acidic), oxidecarbon and specialized materials (Figure 1) . Refractory materials are fabricated in two forms: shaped and unshaped (monolithic) refractories (Figure 2). Shaped refractories include fired and unfired materials with predetermined shapes, precast shapes and fusion cast refractories. Monolithic materials include plastic mixes, castables, ramming materials, dry vibratables, gunning materials, fettling materials, coatings and mortars .
Monolithic materials differ from refractory bricks in that they are not shaped and fired before use. They therefore do not have high energy requirements, are more readily available, take shorter times to install, can be repaired locally and require less manpower .