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Anglo Centre Core Projects

Core Project 1

  • Optimal energy requirement in comminution on the basis of single particle fracture data

    – Marcelo Tavares’ mechanistic ball mill model framework and single-particle breakage testing method have been applied in a new method for calculating the minimum energy required for size reduction of an ore.
  • Incremental Breakage methodology and modelling

    – Benjamin Bonfils has been refining and testing a procedure to characterise repetitive low-energy impact breakage using the JKRBT (Rotary Breakage Tester). This also encompasses work done to commission and validate the Short Impact Load Cell (SILC) at the JKMRC for acurate measurements of particle strength, particle stiffness, and force to first fracture.
  • Sampling technique for Cut and Blasted rock

    – Comparing rock extracted using various mining methods requires taking large samples from underground without allowing it to become mixed with the production ore. Malcolm Powell and Aubrey Mainza are addressing this unique problem of obtaining representative samples and data that will allow the ores from different mining techniques to be characterised and compared as required for the Core Research Projects 1, 2 and 4.
  • Standard lab operating procedures

    – A critical aspect of laboratory testwork is that work is carried out and reported in a consistent manner regardless of who does the work. Rory McKinnon and Lian Liu have been developing a network-based database of all standard laboratory-related procedures.

Core Project 2

  • Dynamic simulation of the MNC circuit

    – Pekka Itävuo has considered the high-level process control of the MNC crushing circuit and highlighted potential throughput improvements. His work centres on the idea of implementing a control system that maintains a steady total inventory of ore within the circuit in each of the bins and on the conveyors.
  • Vertical Roller Mill (VRM) – Review

    – Vertical Roller Mills (VRM) are high reduction-ratio comminution devices that have for a long time been successfully applied in cement and industrial mineral industries. Deniz Altun and Hakan Benzer have investigated the background and history of the VRM and the range of equipment available in this class of comminution device.
  • Vertical Roller Mill (VRM) – Pilot Plant Tests

    – Deniz Altun and Hakan Benzer report on the latest VRM test work using the Loesche GmbH OGP pilot-scale mill. The pilot-plant activities aim to investigate the VRM performance in a minerals application, and gather process data for VRM model development.
  • Dynamic Modelling update and its application to MNC

    – Gauti Asbjörnsson’s most recent work into the complex interactions between process equipment (such as crushers and ore storage bins) can only be understood by simulating the process dynamics. This work has included development of variable speed conveyors and bin models that accurately predict to bin surface profiles within the crusher bins.

Core Project 3

  • Novel Comminution Devices literature review

    – In Ryan Bracey’s review of Novel Comminution Devices, the focus was to 1. Establish a protocol for assessing novel comminution devices by looking closely at the mechanisms, 2. Compare the claimed benefits such as preferential grain-boundary liberation with the supporting evidence and 4. Determine what critical issues might need to be addressed before the device can be applied in an industrial context

Core Project 4

  • Mineral Characterization in 4D with X-ray Computed Tomography

    – Ying Gu and Deming Wang’s work is advancing the application of X-Ray CT to mineral characterization and liberation analysis for platinum ore samples.

Core Project 5

  • Superficial breakage in comminution to develop an abrasion characterisation methodology

    – Mohsen Yahyaei and Nirmal Weerasekara in their research aimed to understand underpinning mechanisms of superficial damage to enable quantifying abrasion of rock particles in any comminution device. Low energy abrasion breakage, even though it occurs at the lower end of the energy spectrum, has a high frequency of occurrence and plays a significant part during any size reduction process. The surface damage test work will be primarily abrasion, but not limited to it. Quantifying the abrasion characteristic will include an approach in measuring ore response to abrasion by introducing an abrasion index or relationship between its appearance function and low energy surface damage events. This knowledge can then be used to propose a generic methodology to test the abrasion characteristic of ores.

Site Specific Work

  • Minas Rio

    – The GCC is providing technical input to modelling various aspects of the Minas Rio iron ore project, including implementation of a model for VTM fine grinding mills.
  • Confluencia Survey

    – The GCC team performed the first 2 surveys of the recently commissioned Confluencia plant in December 2012 and gave numerous direct recommendations.
  • Mogalakwena North Concentrator

    – Following modifications to the proposed capacity expansion circuit at Anglo Platinum’s Mogalakwena North Concentrator (MNC) dry plant, new simulations have been requested in order to support design decisions and as a separate circuit mass balance.