ABSTRACT
A novel technique using high voltage pulses (HVP) for ore pre-concentration has recently been reported. The technique utilises metalliferous grain-induced selective breakage and size-based screening to separate the feed ore by grade. Four copper-gold ore samples were tested to demonstrat...
25-Nov-2015
ABSTRACT
Blasting plays a major role in the fragmentation of rock in open pit mining, which is then crushed and processed before the final product is obtained. Tailoring the blasting method to suit rock mass characteristics can lead to significant improvements downstream. Mine to Mill is a method...
25-Nov-2015
ABSTRACT
The inherent conservatism of the mining industry is well understood, but the current hurdles encountered with financing new projects have complicated instances when new technologies such as high pressure grinding rolls (HPGR) are considered, especially if it translates into higher capita...
25-Nov-2015
ABSTRACT
The ability to rank individual mines by comminution energy intensity in an international database was identified as a priority by the Coalition for Energy-Efficient Comminution in 2012 (Napier-Munn, Drinkwater, & Ballantyne, 2012). Providing a tool to compare the comminution energy int...
15-Nov-2015
Abstract
Selective comminution exploits differences in the comminution behavior of the various minerals an ore comprises. The wider the difference in a material property to be exploited the better the components accumulate in different fractions of the comminution product. The waste portion can be...
15-Nov-2015
Abstract
The purpose of a mineral comminution circuit with a ball mill running in closed-loop with a hydrocyclone classification cluster is to feed the downstream process with the target particle size. Maintaining the optimal particle size in the flotation feed can significantly improve plant cash...
10-Oct-2015
Abstract
AngloGold Ashanti Ltd nominated Sunrise Dam Gold Mine as a case study via their involvement with the long-running Australian Mineral Industry Research Association (AMIRA) International P9P research program (AMIRA, 2015) . A group of researchers from the Global Comminution Collaborative (...
10-Oct-2015
Abstract
The comminution of commodity particles such as ore minerals in mining and metals from recycling of slags, armoured concrete, and incinerator slags by crushing, grinding, and milling makes up the biggest single cost factor in mineral processing. In spite of a marked lack in the developmen...
15-Sep-2015
ABSTRACT
In non-ferrous metal mining operations, it is generally necessary to crush and grind the ore to a very fine particle size to effectively liberate the contained mineral from the host rock. Fragmentation by blasting is the first stage of this comminution process. Numerous studies and indepen...
09-Sep-2015
Abstract
Over the last 30 years the average grade of ore bodies has significantly decreased while the proportion of waste removal has in many cases more than doubled. This in turn has led to a major increase in energy consumption and decrease in productivity across mining operations.
Metal preco...
09-Sep-2015
ABSTRACT
The stirred milling of nickel laterites offers possibilities for improving liberation and selective size reduction of soft nickel-bearing minerals in laterites. Batch grinding tests were performed in a netzsch™ lME4 stirred mill on siliceous goethitic, goethitic, and saprolitic nickel la...
13-Aug-2015
Fine grinding, to P80 sizes as low as 7 lm, is becoming increasingly important as mines treat ores with smaller liberation sizes. This grinding is typically done using stirred mills such as the Isamill or Stirred Media Detritor. While fine grinding consumes less energy than primary grinding, it can s...
13-Aug-2015
ABSTRACT
At the regrind or secondary grinding stages of base metal ores, the concern about energy efficiency is usually extremely important. In general, the specific energy consumption at this stage is higher than during the primary grinding stages. In addition, a tendency of finer grinding has bee...
21-Jul-2015
ABSTRACT
To recover more valuable ore and considering the complexity of minerals, the need to grind finer is increasing. To reach the desired fine grinding targets using the existing grinding media size, the energy consumption is increasing exponentially. As already proved at this conference, sma...
21-Jul-2015
Abstract
The UG2 ore in South Africa is exploited for its enrichment in the platinum group minerals (PGMs). Given that the PGMs are typically very fine grained, the potential for poor liberation is high, especially with conventional cyclones providing a poor split of the coarse silicates and fine c...
15-Jul-2015
ABSTRACT
Ore morphology plays a vital role during the milling and liberation of minerals. This study was carried out to understand the role of mineral crystallography and mineral interfaces on the milling and liberation processes. Data related to mineral crystallography, Vickers Hardness Number and...
15-Jul-2015
Abstract
The JKMRC has recently reported a novel ore pre-concentration method using high voltage electrical pulses (Part 1 of this paper). The technique utilises metalliferous grain-induced selective breakage under a controlled pulse energy input, and size-based screening to separate the feed ore i...
15-Jul-2015
Abstract
A novel ore pre-concentration technique using high voltage pulses is proposed in this study. The technique utilises metalliferous grain-induced selective breakage, under a controlled pulse energy loading, and size-based screening to separate the feed ore into body breakage and surface brea...
14-Jul-2015
ABSTRACT
Optimisation and control of comminution, pelletization, and agglomeration processes is a complex task with large potential for gains in productivity, energy efficiency, and particle size distribution quality. One factor in realising these gains is the requirement for fully-automated online...
13-Jun-2015
Abstract
There is increasing demand to optimise yield and increase capacity of crushing plants. Research in this area has resulted in the development of numerous optimisation tools, and recent research has shown that the quality aspects of production have great influence on the optimisation results...
12-Jun-2015
Abstract
A stirred milling model, based on the concept of shear–volume power, was developed and applied to geometries typically found in mineral processing systems. Generalising this model permits its use to model more complex mill geometries, such as those describing a tapered disk mill and the Co...
12-Jun-2015
015 iPAT Institut für Partikeltechnik
12-Jun-2015
ABSTRACT
Pre-concentration of precious metal and base metal ore types is becoming more relevant with the discovery, development and operation of many lower grade deposits around the world. The fluctuations in metal prices expose many mines to risks especially dealing with low and variable ore gr...
02-Jun-2015
Volume Title: 12th Mill Operators' Conference 2014
The Julius Kruttschnitt Mineral Research Centre has conducted an intensive VertiMill® (VTM) survey program at the Cannington mine concentrator as part of the ‘collaborative research in stirred milling technology’ program funded by Metso Minerals. Si...
15-May-2015
Abstract
DRAMP was approached by the ARM/Lion Ore JV during July 2006 to conduct a feasibility study and Control Budget Estimate for a new Greenfield’s project for their NKOMATI Ni mine 45km east of Machadadorp. The scope included the evaluation and review of previous studies as well as a techno-...
17-Apr-2015
There are a lot of good reasons to manage energy use at mining operations. Optimizing process energy use reduces operating costs. Tracking energy use can help identify unplanned process changes or malfunctioning equipment early, which allows problems to be corrected promptly.
Sacré-Davey Engineer...
03-Apr-2015
Orway Mineral Consultants Ltd (OMC) as a consultancy has specialized in comminution circuit design for over 30 years. The OMC Power Model is OMC’s in-house software for specific grinding energy power-based circuit calculations. The model uses ore hardness parameters from testwork, circuit configurat...
03-Apr-2015
Niobec has been using vibrating screens and screw classifiers as a double stage classification in its grinding circuit since the very beginning of its operation in St- Honoré. Most of the other mineral processing plants around the world uses cyclones as the classification device in their grinding ci...
03-Apr-2015
New Gold Inc.’s New Afton concentrator commenced operation in June 2012, producing a copper-gold-silver concentrate. During the first two years of operation, various optimization efforts have improved mill throughput, recoveries and concentrate grade. Daily mill throughput has increased 20% above th...
03-Apr-2015
Abstract
Optimisation and better control of milling circuits require extensive modelling of milling data. This paper extends the enquiry to the use of the attainable region (AR) technique to determine the optimal residence time of ore in a ball mill. It also evaluates the energy requirements of the...
03-Apr-2015
Abstract
The total energy consumption for ore comminution will further increase within the next decades. One contribution to minimise the increase is to use more efficient comminution equipment. Vertical-roller-mills (VRM) are an energy-efficient alternative to conventional grinding technology. O...
03-Apr-2015
Abstract
Stirred mill power has been modelled empirically, adimensionally and computational intensively through the use of the discrete element method and computational fluid dynamics. To this range of power modelling efforts, one more is added through the development of a shear based power for s...
03-Apr-2015
CMP 2015
Orway Mineral Consultants Ltd (OMC) as a consultancy has specialized in comminution circuit design for over 30 years. The OMC Power Model is OMC’s in-house software for specific grinding energy power-based circuit calculations. The model uses ore hardness parameters from testwork, circui...
02-Apr-2015
The key themes for the 2014 Workshop were best practice and benchmarking. The workshop took place in Vancouver over a 2-day period. Each day included keynote speakers who set the scene for the participants prior to break our sessions for discussion. Keynote speaker topics included, but were not limi...
02-Apr-2015
Abstract
The surface chemistry and mineral liberation changes of a porphyry copper ore after high voltage pulse (HVP) electrical comminution have been investigated using X-ray photoelectron spectroscopy (XPS) and mineral liberation analysis (MLA). Previous studies suggest that electrical comminutio...
28-Mar-2015
Edge effect is the widely observed condition of impaired comminution performance at the edges of High Pressure Grinding Roll (HPGR) tires. This effect is caused by a reduction in the local crushing pressure at the edges of the tires resulting from the interaction between the static cheek plates and...
16-Mar-2015
High Pressure Grinding Rolls (HPGR) technology is the continuous version of the confined particle-bed breakage. Feed size distribution has a key role in total specific energy consumption and product size reduction. Fines in the HPGR feed are defined as relatively small particles that should not unde...
16-Mar-2015
CITIC SMCC has developed a comprehensive system for the design and optimisation of comminution circuits, which is primarily based on the broad range of comminution simulation models developed by Dr. Stephen Morrell and validated against CITIC SMCC’s large industrial database generated by over 150 op...
16-Mar-2015
Traditional motors for milling technology has relied on either Wound Rotor Induction, Low Speed Synchronous Motors, or Asynchronous Induction Motors with mechanical gear reducers. A new alternative is now offered: The Low Speed Asynchronous Motor. This alternative provides the benefit of reduced com...
16-Mar-2015
Multi-stage crushing plants, including high pressure grinding roll (HPGR) circuits, require more materials handling equipment than SAG and ball mill circuits. A temptation exists to neglect the energy consumption of materials handling when doing desktop comparisons of HPGR versus SAG milling circuit...
13-Mar-2015
The demand for minerals and metals is increasing. Head grades of ore bodies are dropping. Remaining ores are becoming finer grained, more complex, and more logistically challenging. Mineral processing – in particular comminution – already consumes a huge amount of energy. But in 20 years’ time, it w...
13-Mar-2015
It has been widely accepted to go for grate discharge ball milling when a coarse product is preferred or to avoid production of extreme fines, but overflow discharge mills are preferred for their simplicity of design and production of finer product. In grate discharge mills the product is discharged...
13-Mar-2015
The High Pressure Grinding Rolls (HPGR) is a relatively new comminution technology that has been shown to be more energy efficient compared to semi- autogeneous (SAG) mills. Full and fair consideration cannot be given to HPGR-based comminution circuits in early stage projects, because presently pilo...
13-Mar-2015
Taseko Mines Limited Gibraltar copper-molybdenum mine recommenced operation in 2004 with the initiation of a series of development projects to increase throughput capacity as well as modernize the mine.
In the second staged development project, a VTM- 1250-WB regrind mill was selected to replace...
13-Mar-2015
The Functional Performance Equation for ball milling circuits provides plant staff with a new means to improve circuit performance. However, successful execution of a plant processing performance improvement project, with verifiable improvements, requires a significant number of accompanying steps b...
13-Mar-2015
Abstract
Comminution is known to be an inefficient user of energy. This makes it the largest energy consumer in many mine sites and therefore a large component of cost. One would therefore have thought that improving comminution energy efficiency would be receiving the undivided attention of the mi...
13-Feb-2015
Abstract
This paper describes a methodology to monitor axial mixing in an IsaMill as a function of mill feed flow rate, mill tip speed and media load. Steady state temperature measurements (profiles) along the mill length were used to quantify the degree of mixing during the comminution process. Co...
13-Feb-2015
Abstract
Discrete Element Method (DEM) simulation using a breakage model is applied to study a broad range of existing compression based crushers to better understand machine level operation and to demonstrate that such modelling is now possible. Predictions for five types of crushers: jaw crusher,...
13-Feb-2015
ABSTRACT
Operational grinding mills emit significant acoustic emissions which are a consequence of the dynamic environment prevailing inside them. From a technical perspective, the noise presents an opportunity to determine some details of the processes occurring inside the mills. The noise generat...
11-Feb-2015
The process of grinding in drum mills is directly dependent on the dynamic forces occurring in the free movement of the grinding bodies in the volume. The subject of discussion are the potential impacts between grinding bodies having different shape and equal weight in a drum mill that has a diamet...
04-Feb-2015