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SAIMM News

  • SAIMM Banquet 2018

  • World Leader in New Steel Research Visits the University of Pretoria

    world leader11dec17

    Photo: Prof Roelf Mostert, Sir Prof Harry Bhadeshia, Prof Charles Siyasiya, Prof Pieter Pistorius and Dr Johan Westraad

    Next-generation bainitic steel with remarkable properties was the central theme of a colloquium hosted by the Department of Materials Science and Metallurgical Engineering at the University of Pretoria on the 4th of December 2017. Sir Harry Bhadeshia, a global leader in metallurgy and the Tata Steel Professor at Cambridge University, was the main speaker. Sir Prof Bhadeshia was on a visit to South Africa as a result of an application made by the Microscopy Society of Southern Africa and the trip was funded through a NRF instrument.

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  • Report Calls for Open Standard for 3D Applications in Mining Industry

    Image result for gmsgUser Interviews and Analysis Highlight Common Challenges

    Wednesday, November 15, 2017 – A new report released by Global Mining Standards and Guideline Group (GMSG) says a survey of more than 18 3D software applications shows the users experience significant difficulties and delays working with the software, collaborating with peers and learning multiple proprietary programs. A solution to these difficulties is an Open Mining Format (OMF) that would encompass a set of guidelines and recommended steps.

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From the President's Corner

  • A Christmas gift for the Institute

    It is the end of the year and Christmas is in sight. We have all had a busy year and thus look forward to a restful break, which we will fill with new memories with our families and friends. Above all, we all look forward to receiving that well-chosen wonderful gift from loved ones. A gift is always treasured. It

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  • Women in the mining and minerals industry

    Summer is finally here and Christmas is around the corner. I do hope that you are all enjoying the warm weather that is prevalent in Southern Africa at this time of the year and, at the same time, have started shopping for those elusive but perfect Christmas gifts for friends and families. Since taking over the reins as the President

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  • Singing the praises of our SAIMM members

    I would like to welcome you all to the new 2017/2018 term of the SAIMM. I hope you are all as excited as I am about what lies ahead. I am greatly looking forward to spending the next twelve months with you as we discuss and delve into different topics that interest us as members of this marvellous Institute. As

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From the Journal Comments

  • The SAMREC/SAMVAL Companion Volume Conference

    This edition of the Journal features papers that were presented at the SAMREC/SAMVAL Companion Volume Conference held on 17 and 18 May 2016 and attended by some 100 people. The intention of the conference was to provide Competent Persons and Competent Valuators with the opportunity to prepare and present details of recognized standards and industry benchmarks in all aspects of

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  • The 6th Sulphur and Sulphuric Acid Conference

    The 6th biennial Sulphuric Acid Conference and Workshop was held in Cape Town between 9 and 11 May 2017. Approximately 90 delegates attended with regional representation from South Africa, Namibia, Zimbabwe, and the DRC and from further afield with delegates from Germany, the USA, UK, The Netherlands, Canada, and Denmark. Delegates representing plant operations management, technical experts, traders, transporters, and

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Market News

  • Preventative maintenance: key to productivity and sustainability

    Operations within the mining, petrochemical, construction, food and beverage, and pharmaceutical industries that use compressed air equipment are confronted with numerous hazards daily, often resulting in varying degrees of injuries and in some cases fatalities. Although there are a number of underlying causes of these accidents - improper maintained air compressors is one of the common causes of equipment-related injuries. In

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Jobs

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 .