Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009).
As the ball wear rate depends directly on the surface of the media charge, a small variation in power will lead to an important increase of wear rate. The risk of underloading or overloading the mill is an additional factor. ... Mill speed Soft design Aggressive design
The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure. The solution automatically controls ore master feed rate and water addition to increase
The Selection and Design of Mill Liners . ... Mines (WA) 36ft SAG mill the number of Outer Head Liners was reduced from 36 to 18 pieces and in doing so reduced the time to replace them by 9 hours at a cost downtime saving of about U$25,000 per hour. In this case the liners sections are 3.5 t each. ... and wear rate, and provided a more ...
Mill motor gear drives can be offered for AG/SAG grinding mill as dual pinion drives with power deliver of up to 20 MW (2 x 10,000 kW), and this can be accomplished on mill sizes up to 36 ft in diameter.
A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed.  Attrition between grinding balls and ore particles causes grinding of finer particles.
grinding mills. Grinding mills supplied by FL have their origins dating back to the ... 1902 and many of the largest plants operating today have these world renowned SAG and Ball Mills operating in some of the most extreme environments. The Vanderbijl Engineering Corporation (VECOR) was ... The design features cast mill heads with ...
The discharge rate depends on how efficiently the discharge pump (grate and pulp lifters) operates. Similar to the impeller design affecting pump capacity, the pulp lifter design affects the discharge capacity (or mill throughput) of AG and SAG grinding mills.
SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates. Typical tests required to define a hardness variability function, are given below in Figure 1.
focused on grinding rates and the second on discharge in SAG/AG mills. It is important to separate the two and acknowledge the test work was conducted together, with the design of the pilot scale grinding tests being Vijayakumar (2015 expected) individual work. This
SAG mill throughput as a function of grate open area As shown in Figure 2 the grate open area has a strong effect on Sossego SAG mill throughput. The nominal capacity of the circuit should be achieved with a combination of 13.5% ball charge and 10.8% open area with 3 and 3.5 inch apertures.
1 Optimization and Control of a Primary SAG Mill Using Real-time Grind Measurement C.W Steyn*, K Keet**, W Breytenbach*** *Control Engineer, Anglo American Platinum, Control and Instrumentation Department, Johannesburg,
SAG mill operation is more dynamic, and typically requires a higher degree of process control sophistication. ... SAG Mill Grinding Circuit Design. View Larger Image ... Critical-sized particles are those where the product of the mill feed-size distribution and the mill breakage rates result in a buildup of a size range of material in the mill ...
Following a successful commissioning and start-up, we believe that two grinding lines at Las Bambas, Perú, each consisting of one SAG Mill and one Ball Mill (this mill combination is uniquely specific to Las Bambas ore types), are operating at design throughput of close to 140,000 tpd and within the range predicted by DJB from a managed multi ...
AG/SAG mill based circuits and this has impacted on the ability of companies to obtain funding. Bailey et al. (2009) published guidelines on the use of typical SAG mill-based circuit design methods, with particular focus on the use (and misuse) of JKSimMet. A follow up paper by Lane et al. in
Proceedings of the 39th Annual Canadian Mineral Processors Conference – 2007 124 ABSTRACT The Cortez SAG mill liner design was recently modified to improve the mill operating energy efficiency. In addition to the expected benefits, the design change unexpectedly played a
The mill design was then made with consideration for the estimated hardness of each block in terms of both SAG and Ball milling with allowance for annual periods when the ore is harder to grind.
Optimizer is a complete solution for the design, development, simulation ... Increasing Productivity Without Capital Expenditure 4 ... Figure 5 – Long-term trend (1day/interval) for pebble crusher feed rate (SAG mill recycle) Figure 6 – Long-term trend (1day/interval) for cyclone feed rate (from ball
Ø Effect of SAG Mill Feed Size Distribution and Ore, I-13 Figure 1: Concentrator Throughput and Availability Project to Date SAG mill availability has reached the design level, however throughput Uganda market sag mill dual pinion geared drive .
SINGLE STAGE SAG/AG MILLING DESIGN ABSTRACT Single stage semi-autogenous / autogenous (S/AG) milling has become a common design for a variety of ore types with the advantages of being comparatively low capital cost and flexible for future expansion.)
SAG Mill I-12 Ř Effect of SAG Mill Feed Size Distribution and Ore Variability Ř Mill liner design modifications, and Ř Circuit Design, and was commissioned with 70mm grates has been challenging A number of operational and.
Page 769 MINING AND MINERAL PROCESS ENGINEERING, UBC - Vancouver, 6. C. Canada AG AND SAG MILL CIRCUIT SELECTION AND DESIGN BY SIMULATION Dr. S Morrell' and Dr. R D Morrison2
The first step in the design of a robust controller for the SAG mill involves obtaining linear dynamic models (expressed as transfer functions) for the impact of the manipulated variable (i.e. feed flowrate) and the disturbance (i.e. the F 80 parameter) on the variable to be controlled (i.e. the SAG mill power draw).
The effects on mill performance of a varying ratio of these two components in the mill feed are not well described by the current generation of AG/SAG models (Stange, 1996).
increase) the SAG mill would need to increase to: Kutcho Creek is a massive sulphide copper and zinc deposit in Northern BC, Canada, which is being engineered to operate at a milling rate …
Constancia, SAG milling, layout, design . INTRODUCTION . ... Ore Type Maximum Mining Rate, t/h Year 0.5 1 2 4 to 6 7 ; ... Constancia's SAG mill F80 is likely to be less than 70 mm. The average RQD for the Constancia comminution hypogene samples was less than 20%. As a result, Ausenco's standard model was adjusted to
SAGDesign testing provides SAG pinion energy grindability in kWh/t to within +/- 5% from 152 to 1.7 mm, and Bond Ball Mill Work Index on SAG ground ore, from the SAG test on the same sample. Starkey & Associates uses the patented SAGDesign technology
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Sag mill design pdf Computer-based modeling of charge motion in SAG mills and on established good design practice. sag mill design pdf Liner design needs to respond to the process aspects of mill.The test and study work showed that a single line 42 ft SAG mill circuit gave the.
A new autogenous and semi-autogenous mill model for scale-up, design and optimisation. Author links open overlay panel S. Morrell. Show more. ... Variation in the fitted breakage rate distribution from a full-scale SAG mill.
For design operating conditions was required. operated at a lower design processing rates of the Cadia Hill SAG mill circuit and that could volumetric filling 25-27%.
Similar to the impeller design affecting pump capacity, the pulp lifter design affects the discharge capacity (or mill throughput) of AG and SAG grinding mills. Generally, the discharge from AG/SAG mills consists of one or both of the following components: slurry …