The application of high pressure grinding rolls (HPGR) has been growing in the mining industry for the last 10 to 15 years. The major benefits supporting this trend are better energy efficiency, improved grinding capacity, and higher metal recovery in downstream processes such as heap leaching and f...

30-Aug-2008

The successful commissioning of the Cerro Verde project in Peru at the end of 2006 marked the culmination of the efforts of many in the industry over many years to have high pressure grinding roll technology recognized and accepted as a legitimate alternative to the conventional approach to large-sc...

30-May-2008

Metso Minerals Process Technology Asia-Pacific (MMPT-AP) has been working with many mining companies worldwide performing ‘Mine to Mill’ or Process Integration and Optimisation (PIO) studies. MMPT-AP has developed a proven methodology to improve the efficiency of the mine-mill interface and gain max...

28-Oct-2007

The resources sector has come to accept that the global quest for sustainable development is one of the key shapers of its future development and business success. While much uncertainty remains regarding the full ramifications of sustainable development, it is uncontested that preventive environmen...

23-Aug-2007

The current status of the modelling of comminution processes is assessed in light of its capabilities and weaknesses. The principles required for a major upgrade in modelling capability are proposed. The use of advanced computational techniques to provide detailed information on the mechanical envir...

23-Aug-2007

CEEC Technical Review Committee comments: Another great paper reminding us that we already have the tools, data and knowledge to start implementing some energy saving strategies not only in grinding, but the all the way through to smelting. A holistic approach is taken and the question asked: Where...

23-Jul-2007

Since October 2003, the BHP Billiton Cannington mill has operated a grinding circuit consisting of an AG mill, pebble crusher and a Vertimill®which in this paper will be referred to as an AVC circuit. What is unique about this circuit is that it utilizes a Vertimill® for secondary grinding rather th...

01-Dec-2006

Oscillatory unstable behaviour in a SAG mill is characterised by the mill constantly cycling between an overload condition and recovery from that condition by a substantial reduction in feed rate tonnes. Such behaviour is commonplace with SAG mills and gives rise to a significant overall reduction i...

30-Nov-2006

Energy consumption and mineral recovery are among the most important factors affecting the mineral processing economy. There are a number of emerging new technologies which have proven to be more energy efficient for comminution, such as High Pressure Grinding Rolls (HPGR) and stirred milling techno...

23-Sep-2006

Johnson   Abstract In achieving the necessary liberation for separation of valuable minerals from ores, metallurgists have traditionally selected from the competing options for size reduction devices by making decisions based on various types of costs. While these costs remain important in s...

23-Aug-2006

Abstract Green, S and Smyth, E (2006) "Developing innovative technologies in support of sustainable minerals processing", presented at MCA Sustainable Development 2006 Conference: Operating for Enduring Value, Perth, Australia, 23-27 October 2006 (invited). CEEC Technical Review Committee comment:...

22-Aug-2006

A finite difference quasi-static thermo-mechanical 2-D model of a theoretical 2-phase mineral is constructed. The aim is to simulate the thermal stresses generated and subsequent thermal damage when a rock particle is exposed to high electric field strength microwave energy. The influences of power...

23-Dec-2005

Significant improvements in design and wear abatement technology combined with escalating energy and steel media costs are making High Pressure Grinding Rolls (HPGR) increasingly attractive for applicable “hard rock” ore applications relative to SAG-Ball milling. In addition, HPGR offers significant...

30-Aug-2005

Extensive in-situ testings has shown that blast fragmentation influences the performance of downstream processes in a mine, and as a consequence, the profit of the whole operation can be greatly improved through optimised fragmentation. Other unit operations like excavation, crushing and grinding ca...

23-Jun-2005

The “functional performance equation for ball milling” was first presented in 1988. It has now been used successfully in a substantial number of mineral- processing plants. This powerful, yet simple, tool provides a new level of understanding of closed circuit grinding. It shows how grinding circuit...

02-Mar-2005

On behalf of the Mining Industry’s Task Force of the Canadian Industry Program for Energy Conservation (CIPEC), the Mining Association of Canada (MAC) retained the Competitive Analysis Centre Inc. to work with mining companies to establish energy benchmarks for underground bulk mining. Companies par...

04-Feb-2005

Public demand for the “Sustainable Development” and CO2 reduction will increase the pressure for more energy efficient comminution. To assess the avenues for reduction of energy required for comminution with already available technologies, modeling and simulations were undertaken using data from a n...

23-Sep-2002

This paper examines the design of comminution circuits and the issues that impact on comminution circuit efficiency.Circuit efficiency is discussed, principally from the perspective of power efficiency. However, operating efficiency, maintenance efficiency, capital expenditure and return on investme...

23-Sep-2002

The paper examines the current state of equipment and circuit design, with reference to Australian practice. Following a review of the changes in milling applications over the last fifteen years, developments in mill design are examined. Current issues include trunnion versus shell support; drive ty...

28-Jan-2002

30-Nov-2001

23-Nov-2001

This paper provides some basic guidelines for comminution circuit selection from a range of alternatives. Factors itemised in the decision making matrix include: Project type and size Ore characteristics and properties Circuit cost considerations Test work costs and impact on project schedule S...

23-Nov-1999

The Julius Kruttschnitt Minerals Research Centre (JKMRC) has been involved in the study and modelling of industrial autogenous (ag) and semi-autogenous (sag) mills for over 20 years. Recent research at the JKMRC has developed a new ag/sag mill model which is based on charge dynamics. The model relat...

28-Nov-1996