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The software uses the particular power model (Bond/Barratt, Morrell Mi, etc.) to determine what is the transfer size where the ratio of E SAG to E ball matches the ratio of mill power (1: in this example). This is the ''maximum efficiency'' transfer size where the mills will both operate at full power.
applied to the pilot plant data when selecting the SAG mill shell and motor size. Upon resolution of issues related to the mill motor and lifter design, the project only just managed to achieve the target throughput of 17 Mt/y (Figure 1). The contributing factors to higher than expected SAG mill specific energy (lower throughput) were:
representative of the whole grate. [slot] all slots mill slot area x r Rel. Radial Posn. = total open area x R ∑ Equation 1 R mill = mill radius to liner plate R slot = radial dist to centre of ...
Designed for discharge efficiency The role of the grate is to allow the discharge of the material ground in the mill via the slots. With our range of alloys and design experience we can offer the longest possible lifetime with the optimal grinding efficiency. The design of the grates will depend on: Drilling pattern Mill speed (rpm) Maximum grinding media diameter (mm) Grinding media filling ...
In a way, the media size should be selected based on feed size and grate opening. Finer feed ( secondary crushed) justifies a 4" ball but if the grate opening is 60 mm x 100 mm slots then a 4" ball won''t last very long. If the feed topsize is >100 mm, then .
Mar 02, 2010· Similar to slurry flowback, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across the grate slots, they get an equal chance to go back into the mill. Similar to slurry pool formation, pebbles flowback would increase the quantity of critical size material in the mill.
Sag Mill Grate Design. Grate Discharge Sag Mill Fact Jeugd Noord. Grate Discharge Sag Mill. ball mill discharge screenow to calculate the ball mill discharge size distributionand the ball mill discharge combine, in grate discharge type ball mill, a grate is provided at the discharge end of shellthe sag mill discharge is screened on a rotating trommel screenall load, mill speed ...
Keywords: grate, SAGMill, DEMSimulation, flowback, carryover 1. Introduction Size reduction of ores has an important role in the process of obtaining various metals. For example, for copper the ore must be separated from the mineral and must reach sizes smaller than 50 m, and this size reduction process takes place in successive stages and ...
Here I try to explain how ground slurry is discharged from a grate ball mill (or SAG). How it works is, the slurry flows across the grate as it would a screen panel. On the other side of the grate/screens are veins like a pump impeller. As the mill turns/rotates the slurry is "pumped" out and discharged. Discharge Grates The natural flexibility of rubber has allowed rubber manufacturers to ...
Similar to slurry flowback, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across the grate slots, they get an equal chance to go back into the mill. Similar to slurry pool formation, pebbles flowback would increase the quantity of critical size material in the mill.
Grate design should incorporate an integral radial lifter. This lift on a grate can increase the grate life by up to 50 percent. The slot opening size is determined by the lump size to be retained in the mill. Grate plugging is minimized by proper slot taper and alloy selection. See Figure 5.
Ball Mill Power Conversion of the ball mill to a grate discharge unit should allow full motor power ( MW) to be utilised. Further, a coarser product is obtained from a grate discharge mill as a consequence of the lower slurry level present in the mill. Grinding Efficiency and Power Utilisation The circuit was bottlenecked at the SAG mill ...
The discharge end of the Grate Discharge Ball Mill has at least ten times the discharge opening area, through the grate slots, compared to the common trunnion overflow type mill. The discharge grates are designed to run clean and free of any blinding or choking. The pulp level in the mill may be varied by merely changing the pulp dilution.
Thus inlets in sags capture of the flow and produce no bypass flow. Note that Drop Curb inlets are always in a sag. Inlets in sag locations operate as s under low head conditions and as orifices at greater depths. Orifice flow begins at depths dependent on the grate size or the curb opening height.
Interception Capacity of Inlets In Sag Locations Inlets in sag locations operate as s under low head conditions and as orifices at greater depths. Orifice flow begins at depths dependent on the grate size, the curb opening height, or the slot width of the inlet. At depths between those at which flow definitely prevails and
Apr 14, 2016· An increase in slot size and operational stability has increased throughput by 7%. Pebble production increased by 24% during the first 50 days of operation, while the wear rate decreased from mm/day to mm/day. Mill availability has increased thanks to .
Jul 01, 2003· All autogenous (AG) and semiautogenous (SAG) mills use steel or rubber grates to hold back the grinding media, whilst allowing the product slurry to flow through and out of the mill. The total open area, size, shape and position of the holes varies considerably from installation to installation (NapierMunn et al., 1996), as given in Table 1.
Similar to slurry flowback, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across the grate slots, they get an equal chance to go back into the mill. Similar to slurry pool formation, pebbles flowback would increase the quantity of critical size material in the mill.
The discharge end of the Grate Discharge Ball Mill has at least ten times the discharge opening area, through the grate slots, compared to the common trunnion overflow type mill. The discharge grates are designed to run clean and free of any blinding or choking. The pulp level in the mill may be varied by merely changing the pulp dilution.
The load in such a mill typically contains 250,000–450,000 particles larger than 6 mm, allowing correct representation of more than 90% of the charge in Discrete Element Method (DEM) simulations. Most AG/SAG mills use discharge grate slots which are 15 mm or more in width. The mass in each size fraction usually decreases rapidly below grate size.
of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at various aperture sizes and radial positions. It also indicates that in order to advance the understanding in a meaningful way, a more mechanistic ...
Jan 01, 2016· The SAG mill had a 6–8% ball charge and the power consumption was 8 kWh/t, which agreed well with the expected value. Problems. In an SAG mill the dimensions of the mill were m × m and the specific gravities of the mineral and .
Many grates in operation are pegged by grinding media to varying degrees of severity. This paper introduces a comprehensive, accurate and rapid method to measure and track the size and pegging status of each and all grate holes in situ, and therefore provides tracking information on the Open Area of a SAG mill.
SAG Mill Performance Sanjeeva Latchireddi Chief Process Engineer Outokumpu Technology Inc. Centennial Co 80112, USA Phone +1 303 792 3110 x224 ... increases with increasing pebble port or grate slot size. As the pebbles flow down, they slide across the grate slots where they get equal chance to go back into the mill.
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