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Centurion, South Africa

Tonzetic I.,Anglo Research | Dippenaar A.,Kumba Iron Ore
Minerals Engineering | Year: 2011

An alternative to the traditional quantification of iron ore sinter mineralogy is presented through the use of QEMSCAN instrumentation. The classification of minerals by QEMSCAN is based on chemical composition whilst the traditional classification of iron ore sinter mineralogy, through point counting, is based on morphology. The classification of iron ore sinter minerals through XRD is based on crystal structure. Advantages of the QEMSCAN technique include the ability to distinguish magnesio ferrites from calcio magnetites and the fact that calcium ferrite and silico-ferrite of calcium and aluminium (SFCA) distinction is not dependant on the sectioning of the sample mount. © 2011 Elsevier Ltd. All rights reserved. Source

Mbele P.,Kumba Iron Ore
Journal of the Southern African Institute of Mining and Metallurgy | Year: 2012

Iron ore concentrate is not easily transported to, or processed in, ironmaking plants, therefore it is necessary to agglomerate. This paper will determine the possibility of agglomerating Sishen concentrate into suitable ironmaking feedstock. Pelletizing is one of the conventional and preferred agglomeration processes for iron ore concentrate investigated at Kumba Value-In-Use Laboratories. Sishen concentrate was mixed with binder, and then pelletized using a laboratory pelletizing disc; afterwards the green pellets were indurated at high temperatures to give strength high enough to survive handling and lessen disintegration in the shaft during ironmaking. Sishen pellets have satisfactory physical and metallurgical properties which make them suitable feedstock for the direct reduction processes. These were tested under Midrex shaft operational conditions and performed well, with a metallization of 94.47% being attained. © The Southern African Institute of Mining and Metallurgy, 2012. Source

News Article | November 6, 2015
Site: http://www.fastcompany.com

Before the world runs short of energy or food, it's likely to run out of usable water. The U.N. says more than 1 billion people live in water-stressed areas, and every forecast shows the situation getting worse because of climate change and population growth. NASA said this year that 21 of the world's most important aquifers have already passed replacement point: more water is being taken out than is going back in. Such numbers aren't lost on the world's largest companies, many of which rely on water to operate. According to a new survey from CDP, a London nonprofit, 27% of global corporations are seeing "detrimental effects" because of water-related issues. In 2015, these impacts had a reported value of $2.5 billion. For example, consumer products giant Unilever says the long-term drought in Brazil will create a "new normal" for its consumers: "For our consumers a lack of access to water is likely to result in a change of behavior such as reduced showering and clothes washing. It is likely that continued drought will further impact on our sales in personal care and home-care categories," it says. Meanwhile, Brazilian utility EDP told investors the drought has hurt its hydropower operations to the tune of $167 to $223 million this year. CDP says 405 out of 1,073 companies "deemed to have high water vulnerability" responded to its survey of water risks—or 38%. And more than half of those haven't done a "comprehensive risk assessment" to understand where the water risks exist. Only 22% of publicly listed oil and gas companies responded to the CDP, even though that sector is often threatened: two-thirds of those reporting say they're vulnerable to "substantive water risks." On the more positive side, CDP picks out eight companies that have achieved an "A" rating its analysis of water risk preparedness. These include Ford, Toyota, Asahi, Colgate Palmolive, Rohm (semiconductors) in Japan, Harmony Gold Mining, Kumba Iron Ore in South Africa, and Metsa Board in Finland. Each has "transform[ed] current standards of corporate water management to meaningful stewardship," the report says. CDP's results show a stark divide between those companies taking water seriously and those assuming it will always be there when they need it. "Just as oil was to the 20th century, water is fast becoming the defining resource of the 21st century. "Unfortunately ... unlike oil, there is no replacement for water," says CDP's Cate Lamb.

Myburgh H.A.,Kumba Iron Ore | Nortje A.,Kumba Iron Ore
Journal of the Southern African Institute of Mining and Metallurgy | Year: 2014

Sishen Iron Ore Mine previously used only A-grade material (>60% Fe in situ value) from the pit for beneficiating in the DMS plant to a final product grade of 66% Fe in lump and 65% Fe fine ore. The B-grade (between 50% and 60% Fe) and C-grade material (between 35% and 50% Fe) were stockpiled separately, owing to the inability of the existing DMS plant to beneficiate material at densities higher than 3600 kg/m3. The ability to beneficiate the B-grade material at densities higher than 3600 kg/m3 was evaluated, and air-pulsed jigs were found to be techno-economically feasible and value maximizing. The beneficiation of B-grade material would add to the existing DMS production of 28 Mt/a, with no additional mining cost and only limited costs for the handling of waste and B-material. The objective of the Sishen Expansion Project (SEP), i.e. the jig plant, was to produce 10 Mt/a of saleable product with six modules to the set physical and chemical specifications by 2009. During the start of construction, it was decided to add another two jig modules to the plant to increase production to 13 Mt/a. During commissioning and ramp-up the shortcomings and advantages of the jigs were fully experienced and understood, resulting in many changes to optimize jigging performance. © The Southern African Institute of Mining and Metallurgy, 2014. Source

Shamaila S.,Anglo Technical Services Research Crown Mines | Ntsoelengoe B.,Kumba Iron Ore | Bachmann J.,Springer | Wurst H.,Springer | Cipold M.,Springer
Journal of the Southern African Institute of Mining and Metallurgy | Year: 2012

The design and efficient operation of density-based mineral processing units requires regular densimetric analysis to be carried out on the various associated process streams. The results obtained from such analyses can have wide application, including the generation of washability and partition curves, which are critical for process design, control, and simulation. This paper describes some of the collaborative efforts that Kumba Iron Ore, in partnership with Springer New Technology and Anglo Technical Solutions Research, is pursuing in developing a novel density determination technique exploiting X-ray transmission (XRT) and optical imaging. This technique is being developed with the aim to determine sample density distributions that apply to washability characterisation of ores. This technique is aimed to be an alternative to the traditional sink and float method. For certain applications sink and float has required the use of tetrabromoethane (TBE) solution-a chemical that has been classified as harmful and environmentally unfriendly. This paper therefore presents some achievements in developing this novel technique which seems to be very promising. © The Southern African Institute of Mining and Metallurgy, 2012. Source

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