Monday, 30 September 2013

Polish conference celebrates its 50th year

The annual Physical Problems of Mineral Processing Symposium celebrated its 50th anniversary early this month, and this year’s event was dedicated to Prof. Janusz Laskowski, the founder of the symposium and the journal bearing the same name. This year’s event held in conjunction with the 18th International Conference of Minerals Processing (MEC 2013) and was attended by 132 delegates, 23 from outside Poland.
Prof. Laskowski opens the conference
MEI was a media sponsor for the event, and the organisers have sent me these photos, to supplement the full report, which can be found on MEI Online.
MEC '13 Conference Delegates

Below is the hydrometallurgical group:from left: D. Hiam-Galvez, T. Chmielewski, Erik Spiller, David Dixon, David Dreisinger, Corby Anderson and B. Krysa
and below the organizers of MEC2013 (from left: A. Bakalarz, F. Koncur, M. Duchnowska, O. Sahbaz, A.Meisinger, D. Szyszka, P. Kowalczuk, K. Kozinski, A. Luszczkiewicz and Jan Drzymala)

Sunday, 29 September 2013

World Gold Award to Dr. Megan Becker

Megan receives her award from
conference chairman Leon Lorenzen
Good news in from World Gold '13, which finishes today in Brisbane. MEI's Process Mineralogy '14 consultant Megan Becker was yesterday presented with an award for the best presentation by a young person at the conference. Her paper Use of mineralogy to interpret laboratory-scale acid rock drainage prediction tests - A gold case study, was co-authored by two other MEI consultants, J-P Franzidis (Flotation '13) and Sue Harrison (Biohydromet '14).  The other two University of Cape Town co-authors were N. Dyantyi and J.L. Broadhurst.

Megan will be reporting on Geomet 2013 which starts tomorrow in Brisbane.

Saturday, 28 September 2013

The effect of water quality on flotation

As water resources become scarcer and society’s demands to reduce freshwater extraction have increased, mine sites have been increasing water reuse and accessing multiple water sources for mineral processing to save freshwater, particularly in froth flotation. Implementation of either strategy may lead to water quality variation that may impact flotation efficiency. In general, flotation is most effectively undertaken with clean water. As a second preference, metallurgists seek a consistent water quality so that reagent regimes for flotation can be developed and applied consistently. Variation in water quality is undesirable because it could complicate operating conditions and compromise flotation performance. This is all discussed in an excellent review of the effect of water quality on flotation, published in Minerals Engineering, by researchers at the Sustainable Minerals Institute of the University of Queensland.
More and more flotation plants have to use groundwater, sea water and recycle water with a high concentration of electrolytes. Despite a number of studies that have been conducted to investigate the effect of saline water on mineral flotation, effective ways to solve many problems encountered in mineral flotation plants using saline water are not currently available. Other University of Queensland researchers will present a review at Flotation ’13 of published articles addressing the effect of saline water on the interfacial phenomena taking place in the flotation process, such as surface wettability, bubble-particle collision and attachment, mineral particle interactions and frothing. They will provide an overall picture of current status of studies in this area and pinpoint directions of future researches addressing different problems associated with using saline water in mineral flotation.

Flotation '13 is only seven weeks away now.  The updated timetable can be viewed here, and the current list of delegates registered here.

Friday, 27 September 2013

A new volume of the classic Hydrocyclones text


Ladislav Svarovsky’s book  Hydrocyclones was published in 1984 and quickly became the leading teaching text for this ubiquitous device. 
Now, almost three decades later, the second volume has been published, updated to take into account further developments and research. 
I have not seen a copy myself, but Paul Salter, MD of Salter Cyclones Ltd, and formerly with Richard Mozley Ltd, writes “(Chapter 7) is a glorious chapter. I’m really grateful to have access to it and it will be a valuable contribution to the level of understanding ‘out there’.” 

If any one “out there” has a copy of the new volume, your comments and views would be appreciated.

Wednesday, 25 September 2013

The end of an illustrious era for South African gold mining


World Gold '13 starts tomorrow in Brisbane. MEI consultant Dr. Mike Adams will be reporting and it will be interesting to see what the general mood is, and how delegate numbers have been affected by the fall in gold price over the past year. Mines all over the world have suffered, but perhaps none more than those in South Africa.
South Africa's gold mining history began in the late 19th century, with the discovery of relatively small deposits in Mpumalanga (see posting of September 21st), but when the prospector George Harrison discovered the outcropping Witwatersrand reef on Langlaagte Farm in 1886 it heralded the dawn of a long era in which gold mining and South Africa would become synonymous.

Although incredibly rich, the goldfields were from the start difficult to mine, requiring deep shafts and high capital investments. Experts in deep mining were drafted in, notably from Cornwall, whose tin mines at that time were the deepest in the world. The shift of economic dominance from the British Cape to the Boer Republic of the Transvaal made gold the catalyst for the Anglo-Boer War and the eventual formation of the Union of South Africa.

South Africa dominated world gold supply throughout the 20th century. I remember that in my early days at Camborne School of Mines virtually every graduate was snapped up by the South African gold mining companies, and I often look back and wonder how the press did not get wind of the fact that this small mining college in the remote south-west of England was training and supplying British students for the Apartheid regime.

In 1970 80% of global gold production was from South Africa. Now it produces only 6% of the world's supply. Only a decade ago South Africa was the world's number 1 producer, now it ranks only 6th, behind China, Australia, USA,  Russia and Peru,  with Canada set to overtake within the next few years at the current rate of decline.

It looks highly unlikely that gold will ever again dominate South African mining. The mines are old and deep and reaching the end of their economic lives, and there is little incentive for massive capital investment. The gold and PGM mines are facing increasingly violent labour disputes, with demands for very high wage increases stimulated by inter-union rivalries.

Unfortunately nothing lasts for ever. Cornwall was once the world's largest producer of copper and tin, but now not a single copper or tin mine survives in the county. Coal was once king in Britain, but all that ended with Margaret Thatcher in the mid 1980s. Coal is now king in South Africa in terms of annual sales value, with platinum second and gold languishing 4th behind iron ore. The decline of the highly labour intensive gold (and platinum) mines must be a cause for great concern for South Africa, where metals and minerals contribute greatly to export earnings and gross domestic product.

Tuesday, 24 September 2013

Comminution '14- Final Call for Abstracts

Mineral processing legend Prof. Alban Lynch recently forecast that comminution would be the most important area for mineral processing this century. There is certainly a lot happening in this field, with equipment and circuits evolving rapidly. At the recent ESCC ’13 in Germany it was interesting to see the ultrafine grinding machines that are used outside the mining industry, but which may feature in future fine grinding circuits.
 Next year’s Comminution ’14 in Cape Town promises to be the biggest in the series, with 22 major companies already providing corporate support.

 We expect a large international audience, mainly from the minerals industry, but hopefully also from other industries who can bring fresh ideas to the meeting. Prof. Tim Napier-Munn, formerly Director of Australia’s JKMRC, will present the first keynote paper “Is progress in energy-efficient comminution doomed?” and Alan Muir of AngloGold Ashanti, South Africa will present the second keynote “The next stage of evolution in comminution”.
Comminution '12 special issue
There is now a final call for abstracts for the conference. Abstracts should be submitted by the end of October. All accepted papers will be published in draft form in the conference Proceedings, and after the conference all authors will be invited to submit final papers for peer-review for a special comminution issue of Minerals Engineering.
 Registration for the exhibition has been open for some time. There are only 4 booths available at the moment, so if you would like to exhibit, please register as soon as you can.