• Monitoring the feed to a SAG or AG mill (e.g. to ensure sufficient proportion of large particles to assist in grinding). • Assessing crusher output (e.g. to ensure crushing / screening is working as expected). • Monitoring the product. • Optimising raw material mix for downstream processing. • Monitoring HPGR feed to ensure fraction
Apr 17, 2018· A typical calculation is given in the following example: Product Size: All passing 6 mesh with 80% passing 20 mesh. Mill, gear and pinion friction multiplier: 1.025. Mill Power required at pinionshaft = (240 x 16.5 x 1.025) ÷ 0.746 = 5440 Hp. 5440 Hp ÷ 0.98 = 5550 HP (required minimum motor output power).
mill contents of an autogenous industrial mill was measured in terms of size and mineral distribution, during a survey conducted at LKAB operations in Sweden. The breakage and transport in AG/SAG mills was found to depend on the physical properties and proportion of the different components in the mill feed.
In this presentation an historical perspective of the origins of Mine-to-Mill is described and is followed by a discussion of how AG/SAG feed size affects throughput and specific energy and the factors that in turn influence AG/SAG feed size, such as ore hardness, Run of Mine (RoM) size distribution …
Distribution of energy between WAM and CDBM mills In 1989, within the framework of the conference on SAG milling, Barratt presented another formula for SEC required for WAM comminution of minerals from F 80 to the size T 80 : E WAM = (6) where T 80 is the size of 80% content of ball mill feed in WAM — CDBM circuit (typically 1000–3000 ...
Rock Size Distribution. Rock Distribution of bulk material ie. mineral ore. ... SAG Mill Discharge. Controlling the feed and discharge of a mill is mostly a stabilisation exercise – you need to be able to quickly and accurately control the mill feed rate. If the mill feed setpoint is changed, then the actual feed rate needs to stabilise at ...
Jan 01, 2015· The feed size distribution is also the implicit result of the ore competence (affecting blasting and crushing performance). This distribution affects the SAG mill load and the load affects directly the mill power and the efficiency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or ...
Ø Manipulation of SAG Mill Operating Parameters (eg. load, ball charge, speed and density) Ø Maximising Pebble Recycle Load and Crusher Interaction With the SAG Mill I-12 Ø Effect of SAG Mill Feed Size Distribution and Ore Variability Ø Mill liner design modifications, and Ø Circuit Design Considerations That Influenced Throughput
operation fluctuations. To sample SAG mill fresh feed, belt conveyor was stopped and a sample was taken by removing material over a two-meter length. Operating condition during sampling was recorded. Particle Size distribution of all samples except mill fresh feed and scats reject was determined using 6730 to 38 µm screens.
Oct 01, 2009· The oversize crusher feed size distribution (oscf) and the primary cyclone feed size distribution (pcfd) are estimated utilising the SAG mill grate size and discharge screen aperture sizes and the Rosin–Rammler size distribution function, which has been selected for its convenience and since it "has been found to fit many size distributions ...
The capacity of the SAG mill is related to lots of factors such as feed size, size distribution, discharge size and grindability, etc., and it should be confirmed according to the actual situation. SM40*14'——means it is a dry mill. Read More Mine-to-Mill: Changing AG/SAG feed size through . 2021-4-27 Mine-to-Mill: Changing AG/SAG feed ...
AG/SAG mill product that needs additional grinding in the ball mill, or "Corrected Ball Mill Feed." T2' is the 80% passing dimension of the Corrected Ball Mill Feed. Figure 1. Comparison of the Particle Size Distribution Slopes Figure 2. Relationship Between the Transfer Size Distribution Slope and T 80 or AWi0/BWi Figure 3.
an 8 m diameter SAG mill with LID = 0.5 grinding a copper ore, and predicted maximum capacity and minimum kWh/ton at about 6070 ball load at 25070 ... complex function of the feed size distribution and specific rates of breakage. However, it is still convenient to define a mean residence time by solid hold-up W divided by solid feed rate, ...
parameters used by the AG/SAG mill model in JKSimMet which permits prediction of the product size distribution and the power draw of the AG/SAG mill for a given feed size distribution and feed rate. In . 0 10 20 30 40 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 3.5 4 t10 (%) Ecs (kWh/t) Weighted Fit 63 x 53 45 x 37.5 31.5 x 26.5 22.4 x 19 16 x 13.2
SAG specific power range of about 3 to 9 kWh/t for this site. The design of the ore stockpiling and conveying system contributes to fluctuating size distribution with significant short-term segregation occurring under certain operating situations. Depending on ore type and feed size distribution, each SAG mill will process between 700 and 3000 tph.
3.3 Cumulative distribution for solids feed, mill charge and sump charge represented by 25, 9, 5 and 3 size classes. (Ref - the reference size class set, l - size classes are log-linearly separated, c - separation between size classes is chosen.) . . . . . . . . . 35 3.4 Manipulated variables MFS and MIW for each controller of the seven size ...
efficient, single stage SAG milling is likely to be the most profitable grinding circuit design. 2. Medium Grind – 80% passing size between 106 and 75 µm. To mill in single stage SAG configuration, the feed must be consistent, not too coarse or too fine. The downstream process must be able to handle fluctuations in the grind size. If these
in a mill should be proportional to grain number N having the definite diameters which they can grind: N b ~ N. (7) The number of grains of the material with determined diameters depends on the grain size distribution. For a great number of materials the grain size distribution at the ball mill feed has been described by Gaudin-Schumann's ...
Jan 01, 2014· The mill reportedly rotates at 70% of critical velocity (Verret et al., 2011), or 54 rpm (Gonzalez, 2000).There is controversy surrounding the mill rotational speed. The calculation of mill critical velocity (V c) is derived from the balance of gravitational force and the centrifugal force acting on a ball, and is given by Eq., after Austin and Concha (1994) (1) V c = 42.2 (D-d) where D is the ...
Apr 01, 2013· The breakage rate distributions are affected by a number of operating conditions. Morrell and Morrison (1996) modelled the effect of ball charge, mill filling, feed size distribution and mill speed on each breakage rate. The resulting 5 empirical equations are embedded in the current JKSimMet Variable Rates AG/SAG model.
Jun 06, 2016· By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebble-crushing circuit product to the ball-mill sump for secondary milling: while convenient, this has the ...
Nov 01, 1993· SAG mill throughput is often a bottleneck to increasing plant productivity. Improved size distribution control in the mill feed can be used to increase mill production. This can be accomplished by controlling blast fragmentation as a function of energy input and rock characteristics. Such an approach requires the integration of rock fragmentation and comminution modeling.
Mar 30, 2018· We describe here one of the very first pioneering SAG Mill Feed Particle Size Analysers: A set of preliminary experiments was carried out in order to assess the hardware-software's behaviour.Static ore was used to obtain the right sequence of image processing algorithms. The camera was installed 3 mts away from the commercial sizer over the feed conveyor of the SAG Mill.
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