Tuning flotation circuit operation as a function of metal prices

Abstract This paper examines the economic advantages of tuning the operation of a differential Cu-Zn flotation circuit as a function of metal prices. Three operating strategies are considered in the analysis: 1) the operation of the circuit at planned copper and zinc concentrates grade with maximum recovery of both metals; 2) the operation of the Cu circuit at maximum copper smelter return per ton of ore and of the Zn circuit at a maximum zinc smelter return per ton of ore; and 3) the operation of the circuit at maximum copper and zinc smelter return per ton of ore. The second strategy tunes the copper circuit independently from the zinc circuit, while the third strategy tunes both circuits simultaneously.
Keywords: Cu-Zn flotation, Metal prices, Net smelter return, Optimization.
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Summary: There are many critical application issues that affect all AC drives, but there are several that are absolutely mandatory for pulse width modulated (PWM) AC drives. If these rules are not followed, the drive system will have insulation, bearing EMI or noise problems.
Publication: CIM Bulletin
Author(s): A.C. Stevenson
Keywords: AC drive, Pulse width modulated drive, Motors, Cables, Power system.
Issue: 1044
Volume: 93
Year: 2000
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Summary: This paper proposes a new direction to implement an underground mine communication system. It presents actual underground communication systems and discusses their technological limits. A new system based on a wireless local area network (WLAN), together with its main systems characteristics, is then proposed. This paper also presents an experimental protocol for radio frequency propagation measurements. Finally, the paper describes the projected implementation of a WLAN in an experimental mine.
Publication: CIM Bulletin
Author(s): S. Outalha, R. Le
Keywords: Communications cellular, Radio propagation, Radio frequency, Wireless local area network, Institute of Electrical and Electronics Engineers.
Issue: 1044
Volume: 93
Year: 2000
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Summary: Current trends of increased size, complexity, and automation of surface mining equipment necessitate more comprehensive and objective techniques for equipment comparison and selection. The field of reliability analysis provides tools to generate quantitative bases for maintenance and reliability aspects of such comparisons. Results from statistical analyses of failure and repair time data are used to perform the comparison. A case study is presented which analyzes five machines of two...
Publication: CIM Bulletin
Author(s): R.A. Hall
Keywords: Equipment, Maintenance, Reliability, Design, Statistical analysis.
Issue: 1044
Volume: 93
Year: 2000
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Summary: In 1997, damage as a result of Castrol R40 entering the INCO pressure carbonyl plant carrier gas stream was becoming increasingly severe. The oil in the gas stream was adversely affecting both equipment availability and process control resulting in rising unit costs. The main source of the Castrol R40 was determined to be the carrier gas and low pressure gas blowers. Plant personnel initiated a plan to prevent the Castrol R40 from entering the carrier gas stream by replacing the mechanical...
Publication: CIM Bulletin
Author(s): C. Corless, J. Costigan
Keywords: Castroll R40, INCO, Gas blowers, Sealants, Lubricants.
Issue: 1044
Volume: 93
Year: 2000
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Summary: The most common theory is that, since thyristors, diodes, and insulated gate bipolar transistors (IGBTs) are Òsolid stateÓ they will live forever. This is not so. They have wear-out mechanisms (e.g. insulation) and other mechanical parts such as motor bearings. These wear-out phenomena can be easily calculated. In this paper we will look at some of the failures and the failure rate of thyristors in power converters to see what affects them and to see what improvements can be made. If...
Publication: CIM Bulletin
Author(s): A.C. Stevenson
Keywords: Forensic engineering, Thyristors, Diodes, Thermal fatigue, Semi-conductor.
Issue: 1044
Volume: 93
Year: 2000
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Summary: pment employed is one of the key factors in reducing production cost in mining. One of the best ways to achieve it is an increase in availability. In order to identify the most adverse factors affecting it, reliability and maintainability analysis ought to be done. If its results are to be conclusive, a sufficient amount of credible and consistent data is indispensable. Following the experience from field studies done in underground mines, this paper discusses the current status of failure...
Publication: CIM Bulletin
Author(s): J. Paraszczak
Keywords: Mean Time Between Failures (MTBF), Load-haul-dumping (LHD), Failure, Maintenance man-hours (MMH), Equipment.
Issue: 1044
Volume: 93
Year: 2000
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