The SAIMM is a professional institute with local and international links aimed at assisting members source information about technological developments in the mining, metallurgical and related sectors.
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  • Joburgtv Interview at the Women in Mining Breakfast

    Joburgtv for captured some of the highlights of the Women in Mining Breakfast which was hosted by Women in Mining South Africa and SAIMM at WorleyParsonsTWP on 13 February 2018. View the video to see what Prof Selo Ndlovu, Petro Du Pisani, Zelmia Botha, Anniekie Mpherwane, Tshepiso Ndlovu, Refentse Fensi Molehe and Marinda Hawthorn had to say about the event.

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  • Writing NI 43-101 Technical Reports for the TSX

    It has come to our attention that Members of the SAIMM and both Members and Fellows of the GSSA are not on the current list of Acceptable Foreign Associations and Membership Designations in Appendix A of Companion Policy 43-101CP which is part of NI 43-101.

    This means that no Member of SAIMM and no Member/Fellow of GSSA can use their SAIMM/GSSA registration to compile NI 43-101 documents for the Toronto Stock Exchange.  This does not affect any geoscientist who is registered with SACNASP.  Neither does it affect engineers registered with ECSA or who are Fellows of SAIMM.  This will, primarily, affect GSSA members living/working outside of South Africa, who are not registered with SACNASP.

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  • GMSG Corporate Member Report January 2018

    future mining 2018The Global Mining Standards and Guidelines Group (GMSG) January 2018 Corporate Member Report has been published. It contains an overview of projects which are defining the future of mining and helping to create solutions to industry challenges. This year’s Corporate Member Report features important GMSG news, highlights and an overview of GMSG’s guideline work, and outlines GMSG’s new 2018 strategy. The report is available here.

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From the President's Corner

  • A new year, new reflections

    The start of a new year is always worth celebrating. We celebrate the achievements of the previous year. We also celebrate making it through the previous year’s challenges and, with optimism, look forward to twelve more fruitful months ahead. However, the fact that a year of our life has just passed by also usually leads to introspection. We question our

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  • 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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From the Journal Comments

  • The SAIMM Journal

    The SAIMM organizes a number of conferences every year to promote technological developments in the mining- and metallurgy-related sectors. Selected papers from each of these conferences are published in the SAIMM Journal throughout the year. The SAIMM Journal is not only one of the top journals but also one of the most popular journals in the field of mining and

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  • 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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Market News

  • Anglo American’s renewed partnership with Vuka Marine is a boon for South Africa’s maritime industry

    Thursday, 08 March 2018 - Anglo American renewed its various ocean freight contracts with Vuka Marine, a joint venture between Via Maritime Holdings of South Africa and Kawasaki Kisen Kaisha Ltd (“K” Line) of Japan. Under these freight contracts, Anglo American transports bulk iron ore and coal products to its customers around the world. Vuka Marine operates two capesize bulkers—the Cape Enterprise

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  • PRESS RELEASE: Excavators ready to boost economy

      Rhett O’Neill of ELB Equipment      A large shipment of Sumitomo excavators has arrived in South Africa in anticipation of future growth of the economy ELB Equipment is aggressively gearing its excavator offering to meet an anticipated demand upsurge as the economy turns upwards. “Excavators are at the heart of any construction or mining operation and their availability is

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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 .