The overflow ball mill used here is a 6 m diameter × 10 m long (external shell dimensions) design as was the case in the last section. The belly liner and end wall lifter. Full grinding prediction in a SAG mill including slurry phase size reduction. Finally, we consider prediction of the slurry phase grinding using a batch pilot scale SAG mill.
Figure 2 shows the throughput versus SAG mill load for two different liner designs and operating loads, and the power draw versus SAG mill load for the Cadia SAG mill (Hart et al., 2001). Both ...
In this paper, we develop a state space model of semi-autogenous (SAG) mill systems, which is of great significance to the mineral processing control. According to the practical enterprise ...
Considering the continuous increase in production costs and resource optimization, more than a strategic objective has become imperative in the copper mining industry. In the search to improve the efficiency in the use of resources, the present work develops models of a semi-autogenous grinding (SAG) mill using statistical analysis and …
3. SAG mill fractional total filling, J t, fractional ball filling, J b, and fractional rock charge filling, Jr, ( J r = J t − J b); 4. SAG mill total feed; 5. Oversize crusher product and primary cyclone underflow; and, 6. SAG mill fresh feed, including the feed sizes ( F 80. . . F 20). Step 1: Oversize Crusher Feed, Primary Cyclone Feed and ...
I-217 MILLING CURVES AS A TOOL FOR CHARACTERISING SAG MILL PERFORMANCE André P. van der Westhuizen and Malcolm S. Powell Mineral Processing Research Unit, University of Cape Town,
First, a pilot-scale SAG mill with dimensions of 3.0 m × 1.5 m with no lifter is simulated. Then by adding, respectively, one, two, four, eight, sixteen, and thirty-two rectangle lifter(s), six ...
SAG mill power consumption as a function of the proportion of -152 +25mm in the fresh feed for SAG mills of different diameters (after Casili A. and Silva N.,2015) Mill feed size distribution ...
The DEM and erosion model SIEM were used to predict wear within the SAG mill. The simulation results of the standard case (the rotation speed is 10.5 rpm; the angle of the lifter face is 14°; the lifter height is 152 mm) are quantitively validated against the corresponding experimental data [6], and the effects of the rotation speed and lifter ...
SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills' discharge and pumped to two parallel packs (clusters) of ...
A semi-autogenous (SAG) mill. 4. MODEL IMPLEMENTATION The SAG mill model was available in Simulink as a result of the efforts of Le Roux et al. (2013) and Wakefield et al. (2018). It was decided to extend the model to expose the variables (listed in Table 1) through the industry standard OPC communication interface.
The Morrell C-model is generally regarded as one of the most accurate tumbling mill power-draw models and is ideally suited for this application of estimating fill levels of the SAG mill in real time.
feed rate = 550 t/h, F 80 = 110,000 µm and a target grind P 80 = 125 µm. A SAG mill of 13 MW with D= 36 ft and . L= 18 ft (aspect ratio of 2) was implemented with a pebble crusher.
Optimisation of the Cadia Hill SAG mill circuit. September 2001. Conference: SAG2001 - International Conference on Autogenous and Semiautogenous Grinding Technology. At: Vancouver, Canada....
Investigation Report SAG Mill 20110414 An investigation into the SAG Mill's peak on the – power versus loading curve. Investigation Report Conveyor 20110428 – Discovery of under-designed pebble crusher discharge conveyor, and other conveyors and feeders under-designed when considering process design criteria surplus factors.
Abstract. The present study investigates the propensity of predicting ore grindability characteristics and varying pulp densities through acoustic measurements on the Magotteaux ball mill. Specifically, the grinding behaviour of two different mill feeds (model quartz and iron ore) together with solid loadings (50, 57, and 67 wt% solids) were ...
SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer-based modeling of charge motion in SAG mills and on established good design practice. Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance, i.e., the …
Best Practice Comminution means running a SAG mill under optimal conditions, and avoiding overloading, overspeeding and using excessive steel additions, both during the design and operating stages of the plant. When normal limits for these parameters are exceeded in the design stage, production shortfalls will result, and …
Mill designs are of f the shelf tod ay for a SAG mill of up to 28 MW followed by t wo Ball Mills o f up to 24 MW. It is possible to have a single processing line c apable of handling over 200,000 ...
In general AG and SAG mill researchers have hypothesized that at least two breakage mechanisms are active in a SAG mill – a rounding of particles producing fine progeny and more vigorous breakage producing angular progeny. The mathematical model in common use (Leung et al., 1987; Morrell and Morrison, 1996) provides a continuum …
> Mill throughput and efficiency gains are iterative over time > Mill trajectory modelling based on bar heights, angles, spacing and speed is very predictive > Field trials are the acid test - operator, designer and vendor > Optimisation strategy: – Maximise impact grinding …
2.1 SAG mill model The particles fed to the mill are ground in the milling chamber and subsequently downloaded into the discharge zone, where, according to a classification probability, they are either returned to the milling chamber for further grinding or become part of the mill output stream.
An increase of over 10% in mill throughput was achieved by removing the ball scats from a single -stage SAG mill. These scats are non- spherical ball fragments resulting from uneven wear of balls ...
Machine Learning-accelerated SAG Mill Optimization (P. Shelley) 11:15 11:30 Paper 10 Remote grinding mill operation – a key contributor to the low emission mining society (A. Fernandez) 11:15 11:30 Paper 10 RAPID Diagnostics and Observations of the Internal Operation of a SAG Mill in the Context of its Grinding Circuit. (R. Pax) …
Kidston Gold Mines is a 14 000 tonnes per day rated operation located 280 kilometers west of Townsvilie in Queensland. The principle shareholder is Placer Development Limited. Kidston's orebody consists of 44.2 million tonnes graded at 1.79 g/t gold and 2.22 g/t silver. …
7.0 m length (190) single SAG mill equipped with a 20 MW electric motor. The SAG mill product flows to two 3.6 m (120) by 7.3 m (240) horizontal screens, whose combined oversize (pebbles) is diverted to two Metso MP 800 cone crushers. The crushed product returns to the SAG mill feed, closing the primary grinding circuit. The horizontal …
Metallurgical Energy Requirement - Autogenous Mill/SAG Mills Pc - Power for crushing 10 11 80 80 **Wc (FFr − ).....(1) F80/P80 - AG/SAG feed/product 80% passing size Wc - Crushing work index kWh/t Fr80 - 80% passing size for pseudo rod mill feed Pr Power for rod milling 10 11 80 80 **Wr (FFb r − )
The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size. Considering a typical mining operation processes 10,000 to 100,000 tons per day the energy expenditure in grinding is 50 …
The SAG mill product flows to two 3.6 m (12′) by 7.3 m (24′) horizontal screens, whose combined oversize (pebbles) is diverted to two Metso MP 800 cone crushers. The crushed product returns to the SAG mill feed, closing the primary grinding circuit. The horizontal screen undersize is pumped to two separate secondary grinding …
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 …
along the longer mills incr ease s, as found out in the application to the first 40 foot SAG mill at Cadia (Hart e t al., 2001 ). The obvious alternat ive is to prevent the larger rocks from ever ...