| 1. |
- Asbjörnsson, Gauti, 1985, et al.
(författare)
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Different perspectives of dynamics in comminution processes
- 2022
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Ingår i: Minerals Engineering. - : Elsevier BV. - 0892-6875. ; 176
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Forskningsöversikt (refereegranskat)abstract
- The performance of a comminution and classification process depends on the design and configuration of each process unit, the configuration of the plant, the design of the control and physical properties of the incoming feed. Comminution processes should be designed to have a stable and efficient production over a wide range of conditions. However, demands from the management, operational cost, investment, maintenance or any other related field can result in process alterations that are not beneficial for the stability of the circuit and, therefore, utilization and efficiency of the production. Furthermore, advanced process control and optimization rely heavily on understanding the dynamic behaviour of the process in achieving a more stable and consequently efficient process. This review aims to explore different dynamic aspects from particle, bulk, unit and process perspectives, their origin, and what consequences they may have on the operation. The aim is to illustrate a holistic view of process dynamics that should be considered when evaluating circuit performances and identifying risk zones that affect the process, considering the state-state performance and dynamic behaviour. Based on that, several dynamic related issues were formulated and ranked by experts within the field to get a subjective perspective. Issues such as process control design and configuration, ore variability, segregation and upstream disturbances ranked high in possible gains for comminution processes.
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| 2. |
- Asbjörnsson, Gauti, 1985, et al.
(författare)
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Understanding Different Perspectives of Dynamics in Comminution Processes
- 2021
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The performance of a comminution and classification process depends on the design and configuration of each process unit, the configuration of the plant, the design of the control and physical properties of the incoming feed. Comminution processes should be designed to have a stable and efficient production over a wide range of conditions. However, demands from the management, operational cost, investment, maintenance or any other related field can result in process alterations that are not beneficial for the stability of the circuit and therefore utilization and efficiency of the production. Furthermore, advanced process control and optimization rely heavily on understanding the dynamic behavior of the process in achieving a more stable and consequently efficient process. The objective of this review is to explore different dynamic aspects from particle, bulk, unit and process perspectives, their origin, and what consequences they may have on the operation. The aim is to illustrate a holistic view of process dynamics that should be considered when evaluating circuit performances and identifying risk zones that affect the process, both considering the state-state performance as well as the dynamic behaviour.
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| 3. |
- Bhadani, Kanishk, 1991, et al.
(författare)
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Experimental and simulation-driven improvements for coarse comminution circuit using Plantsmith process simulator - A case study of Geita Gold Mine, Tanzania
- 2021
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Continuous improvements are a key aspect of driving an industrial process plant at a profitable state. The performance of the crushing plant is driven by each equipment’s (crusher, screen conveyors, bin, etc.) operation, raw material properties, operational strategies, control system, maintenance, and so on. To bring improvements for full-scale industrial units, a thorough investigation is needed. In the considered case study, a need was posed by the industry operating coarse and fine comminution circuit to investigate the opportunities for upscaling and downscaling of the plant capacity along with evaluating the performance of the existing circuit. The need is driven by the change in ore characteristics from the mining segment. As the decision’s in the industry is driven by the cost, it is important to find opportunities which will increase the profitability and produces a viable solution(s). The paper presents a methodological approach for evaluating the performance of the crushing plant by carrying out: • Physical investigation and observation • Experimental survey and laboratory data analysis • Evaluating historical production data • Simulation configuration and calibration in Plantsmith process simulator • Evaluating alternative concepts using Plantsmith process simulator The evaluation presents possible improvements in the existing plants, and alternative concepts with their opportunities and pitfalls. The results show that a methodological approach can bring a wide understanding of the plant operations and simulation tool is useful for evaluating operational scenarios. Also, multiple practical aspects are presented concerning the investigation process.
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| 4. |
- Bhadani, Kanishk, 1991, et al.
(författare)
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Simulation-Driven Development for Coarse Comminution Process - A Case Study of Geita Gold Mine, Tanzania using Plantsmith Process Simulator
- 2021
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Ingår i: Proceedings of the Design Society. - : Cambridge University Press (CUP). - 2732-527X. ; 1, s. 2681-2690
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Konferensbidrag (refereegranskat)abstract
- A comminution process is a material size reduction and separation process which is primarily used in the aggregates and the minerals processing industry. Knowledge related to equipment’s operation, raw material properties, operational strategies, control system, maintenance, etc. is needed to design a capable plant. New needs are arising from the industry for existing operational crushing plants such as investigation for improvements, upscaling, and downscaling of the capacity. The paper presents an application of simulation-driven development for a crushing plant in an existing gold processing plant. Due to the change in ore characteristics and the need for optimizing the cost of operation, it is required to investigate the opportunities for improvement and alternative options for downscaling the capacity of the plant. A systematic process for configuring, developing, and evaluating alternative concepts using a process simulation tool is presented. The results show the process of generating knowledge for alternative crushing plant operation settings and how the choices can be selected and eliminated using boundary conditions. The evaluation presents possible improvements and alternative concepts with their opportunities and pitfalls.
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| 5. |
- Powell, Malcolm, et al.
(författare)
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Redesigning SAG Mill Recycle Crusher Operation
- 2019
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Recycle crushing is used extensively to boost SAG mill throughput, by rapidly reducing the competent pebbles that would otherwise build up in a SAG mill. Although applied with considerable success, it is the Authors observation that the crushers are generally poorly utilised: operating well below installed power; switching on and off; and set at large closed side settings. Application of good design and control practice has the potential to increase crusher efficiency in terms of reduction ratio and thus in turn increase SAG mill throughput and unload overloaded Ball mills to open up circuit capacity. Examples of operating practice and potential are provided to illustrate this.
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| 6. |
- Powell, Malcolm, et al.
(författare)
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Transforming the effectiveness of a HPGR circuit at Anglo Platinum Mogalakwena
- 2011
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Ingår i: Proceedings International autogenous and semiautogenous grinding technology 2011.
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Konferensbidrag (refereegranskat)abstract
- was one of the first three hard rock mineral processingapplications to utilise a HPGR circuit in preference to aSAG milling circuit. This was driven by the extremecompetence of the ore that had given rise to throughputissues on the original South plant.Despite more than adequate capacity and performanceof the individual comminution units, the circuit hasstruggled to obtain full design capacity. A thoroughreview of the integrated performance of the circuitrevealed a wide range of bottlenecks and underutilisedparts of the circuit.Interestingly, the major opportunities lie in materialshandling issues and mismatch of loads about thecircuit. This paper presents the high-level outcomesand the associated opportunities, and is pertinent to allnew HPGR circuit designs.
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