Higher classification efficiency by hydrocyclone control

CIM Journal, Vol. 2, No. 2, 2011
T. Neesse, M. G. Farghaly, M. A. Hararah, G. Proellss, W. Rubarth and P. Kaniut
Abstract This paper presents two new options for hydrocyclone control. Volume split control using a control valve in the overflow is applied for the stabilization of separation results at changing feed conditions. Controlled water injection to the conical part of the cyclone leads to the reduction of fine particles in the underflow. Hydrocyclone monitoring in both cases is performed by optical sensors that indicate the spray angle of the underflow. Applications in mineral processing for desliming, classification in closed-circuit grinding, and dewatering are demonstrated.
Keywords: Hydrocyclone control, Desliming, Classification, Dewatering
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Publication: CIM Journal
Issue: 2
Volume: 2
Year: 2011
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Summary: Joseph (2002) introduced passive seismic monitoring to measure mining equipment performance. This paper evaluates the potential of passive seismic monitoring to correlate mining equipment operation with oil sands surface response, with a mining hauler as the seismic source. When applied to moving haulers, this action–reaction approach is complex. Vibrations from on-board equipment, such as pumps and tires, dirty the signal with noise. To facilitate any correlation, the signal must be cleaned...
Publication: CIM Journal
Author(s): T. G. Joseph, M. Welz
Keywords: Seismic monitoring, Mining equipment, Vibrations, Motion correlation
Issue: 2
Volume: 2
Year: 2011
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Summary: Data were produced from two uranium project studies that were conducted in 2008, both involving uranium recovery from leached slurry by resin-in-pulp (RIP) with strong base resins. In both studies, excellent metallurgical results were produced. The loaded resins were eluted with strong sulphuric acid and recycled through RIP circuits in an integrated process. Resin losses by either abrasion or mechanical breakage were immeasurably low. Metallurgical results from these two campaigns are...
Publication: CIM Journal
Author(s): J. Brown, J. R. Goode, C. Fleming
Keywords: Uranium, Ion exchange, Resin-in-pulp
Issue: 2
Volume: 2
Year: 2011
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Summary: The Canadian oil sands provide some of the harshest mining conditions in the world. As operations demand ever bigger tools, the toll on large mobile mining equipment is high, with structural life often half of that expected. Soft ground conditions predominantly lead to fatigue failure scenarios, poor stability, and inconsistent payload evaluations. These challenges are not solely a concern for Canadian oil sands mines; there are far-reaching implications for surface mining equipment in any...
Publication: CIM Journal
Author(s): T. G. Joseph
Keywords: Haulers, KPI (Key performance indicators), Rack, Pitch, Roll, g level
Issue: 2
Volume: 2
Year: 2011
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Summary: A series of algorithms were developed to perform geometric and kinematic analyses of cable shovel dipper-ground interactions for a given set of mining face conditions. The routines examine and analyze (a) the position of the dipper in relation to the shovel; (b) the dipper in relation to the face conditions; (c) the dipper position in relation to possible interference or collision with crawler tracks during digging cycles; and (d) kinematic and geometric considerations with respect to any...
Publication: CIM Journal
Author(s): T. G. Joseph, N. Shi
Keywords: Cable shovel, Kinematics, Geometry, Trajectory, Collision avoidance
Issue: 2
Volume: 2
Year: 2011
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Summary: Despite many years of practical applications in mineral processing plants, the potential of column flotation has still not been fully exploited. The challenge in measuring some key variables is certainly an important contributing factor to this situation. Reliable online measurement of variables, such as the froth depth, bias, gas hold-up, frother concentration, bubble surface area flux, and bubble size distribution, provides opportunities for the application of various advanced control...
Publication: CIM Journal
Author(s): A. Desbiens and R. del Villar, M. Maldonado, J. Bouchard
Keywords: Column flotation, Froth depth, Bias, Gas hold-up, Frother concentration, Bubble surface area flux, Advanced control, Real-time optimization
Issue: 2
Volume: 2
Year: 2011
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Summary: The Kupol project, located in Far East Russia, treats a high-grade, free-milling ore containing 25.5 g/t Au, 298.3 g/t Ag, and 0.5% pyrite, with a P70 of 53 microns. Most of the gold occurs as electrum and the silver is predominantly present in the forms of acanthite, stephanite, pyrargyrite, and proustite. The mill reached the design throughput of 3,000 tpd six months after start-up. A Knelson concentrator recovers 10.4% gold and 0.5% silver. Leaching (14.5 hours pre-treatment and 116 hours...
Publication: CIM Journal
Author(s): J. Rajala, G. Deschênes, A. Romanov and G. Kolosay
Keywords: Gold, Silver, Sulphide, Minerals, Cyanide, Kupol, Leaching
Issue: 2
Volume: 2
Year: 2011
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