SAG Mill Testing
mill. As such, primary ball mills should be designed with the rod mill work index, and single-stage ball mills should be with both the rod mill and ball mill indices. This is because it is common to observe a difference (sometimes significant) between the rod mill and ball mill index values for a given ore type (McKen, Verret, & Williams, 2006). On
A comparison of SAG mill power models
Gross power = 265 + 1.26 × (2,233 + 215) = 3,349 kW. The conversion between motor input (gross) power and mill shell power, described earlier, is 0.931. Therefore, the predicted power at the mill shell is 3,119 kW, which is 71 kW less than the measured shell power (3,190 kW), a difference of 2%.
Ball Charge and Grinding Efficiency
SAG & Ball mill % ball content SAG % ore content SAG grate size and end mill design including grate geometry, location, shape, pan cavity, recycle % in pan cavity, et. al. SAG lifter and end cone geometry - can change SAG mill performance more than 20%-50% depending on P80 transfer size and Axb, some of which is published and some will be ...
Choosing a SAG Mill to Achieve Design Performance
Decreasing the SAG mill diameter by 2 feet from 36 to 34 ft. causes a 2 MW reduction in installed SAG power or an 18% decrease from 11 to 9 MW. This energy can …
SAG Mill Ball Sizing
With high aspect ratio SAG mills total charge to ball charge ratio should be greater than 2 (up to 2.5) for a coarse mill feed (say F80 > 110 mm). If the mill feed size is fine, say 50 mm or 30 mm, then you are looking at a total charge to ball charge ratio of about 1.5-1.6.
Autogenous and Semi-autogenous Grinding Circuits
•Primary SAG (or AG) followed by ball mill This is the most basic type of SAG or AG circuit where the primary crushed ore enters the SAG or AG mill, gets ground to a "transfer …
Difference Between Sag Mill Vs Ball Mill | PDF | Mill …
Difference Between Sag Mill vs Ball Mill - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. the different between of sagmill and ball miil
SAG mill compared to crusher and ball mill product size …
This paper compares the performance of a 25/75 pebble/ball (volume ratio) composite charge to ball-milling, under conditions typical for a ball-mill in SABC circuits, i.e. a large ball top size ...
Difference Between Sag Mill vs Ball Mill
Ball mill is a fine grinder. A horizontal or vertical rotating cylinder which is filled partially with the balls of ceramics, small rocks and balls made from stainless steel. The ball charge of a SAG mill is about 29% to 30%. By …
Overflow VS Grate Discharge Ball or Mill
Grate Discharge Ball Mills have shown 25% to 45% more tonnage ground and a substantial reduction in power consumed per ton of material compared size for size with overflow mills. To illustrate the …
SAG mill VS Ball & Rod Mill
The final product size depends on the retention time and grinding capability of the type of mill. The finer the grind size equates to the decision of a Ball, Vertimill, SMD (e.g. ISAmill). The pairing mill combination of a SAG/Ball mill is common in copper/gold mines for that reason. This combination can aim for a fine product sizes are around ...
SAG Mill Ball Size Evaluator | Evaluation Factors | Calculate …
The SAG Mill has a "small" circulation load of oversize given be the 3/8″ trommel screen and the 1/2″ x 1 1/4″ discharge grates. The load of 4″ balls in this SAG is "good" but un-measured. SAG Ball consumption is "average" at 400 g/t while Ball Mill grinding media (3″ balls) usage in 550 g/t. Yet, you add steel and nothing ...
Ball, Pebble and SAG Mills: A Buyers Guide
The Ball Mill. Much like all types of mills, the Ball Mill's purpose is to grind and blend material into smaller pieces. To do this, the material is fed into the cylinder at an angle and then rotated inside. During rotation, the material travels up the internal wall of the cylinder and then falls back down to the bottom of the structure.
AG Mill and SAG Mill
AG Mill and SAG Mill. Feeding size: ≤25mm. Capacity: 0.65-615t/h. Output size: 0.074-0.89mm. Applications: It is commonly used in the mineral processing industry and ferrous and non-ferrous metal ore and nonmetal ore processing plants. It can also be used in cement plant, refractory plant, fertilizer plant and smelting plant.
Semi-Autogeonous (SAG) Mill Overload Forecasting
1 Introduction. In mining, a Semi-Autogenous Grinding mill (SAG) is the equipment used at mineral processing plants in the size reduction process, making the ore suitable for the next stage of flotation. Its use lies in significant processing and reduction capability offered by this kind of mill, where maximize the operational continuity and ...
Autogenous and Semi-Autogenous Mills
A typical SAG-HPGR-Ball mill circuit suggested by Patzelt et al. [6] is shown in Figure 9.6, where the pebbles from the SAG mill are crushed in the high-pressure grinding rolls. ... SAG mills of comparable size but containing say 10% ball charge (in addition to the rocks), normally, operate between 70 and 75% of the critical speed. ...
Difference Between Sag Mill And Ball Mill Solution For Ore
What's the Difference Between SAG Mill and Ball Mill . 26/11/2019 SAG mills grinding media includes some large and hard rocks, filled rate of 9% – 20% SAG mill grind ores through impact, attrition, abrasion forces In practice, for a given ore and equal processing conditions, the AG milling has a finer grind than SAG mills12/10/2017 The ball charge of …
SAG Mill Liner Design
Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit …
Differences in Properties between Pebbles and …
The results of ball mill grinding tests are shown in Figure 6. Figure 6a,d show the effect of grinding time on the particle size composition of the raw ore and pebbles, respectively. As expected, the grindability of …
SAG Mill Design and Benchmarking Using Trends in the …
It is possible that the different sensitivities of mills in SAB vs. SABC configurations to ball load is due to the role of steel media in breaking pebbles. In the absence of pebble …
Ball Mill vs Rod Mill: Which is the Best for Your Mining …
One of the advantages of a rod mill is that it can handle a higher capacity than a ball mill of the same size. Additionally, the grinding medium in a rod mill is more uniform than that in a ball mill, and this can be beneficial for certain materials. Rod mills are also relatively low-maintenance, making them a cost-effective option for many ...
SAG Mill Testing
This is because it is common to observe a difference (sometimes significant) between the rod mill and ball mill index values for a given ore type (McKen, Verret, & Williams, …
(PDF) Toward a Simple Approach Determining Single Stage SAG mill …
In a SAG mill followed by ball mill circuit configuration, the SAG mill object ive is to maximize the production of ore at a suitable size (typically 12 mm) so the ball mill can treat the ore ...
AG/SAG mill acoustic emissions characterisation under different
However, the difference between the dry and wet grinding condition was reduced, clearly demonstrated below frequency less than 5 kHz. The effect of increasing slurry viscosity could affect the motion of the steel balls in the mill and corresponding mill noise emission. Download : Download high-res image (429KB) Download : Download full …
Key considerations when selecting a mill lining system | Weir
These two types of mills are filled with varying compositions of grinding media. SAG mills contain balls of up to 150mm in diameter that occupy 5%-18% of mill chamber volume. Ball mills, conversely, contain grinding media up to 50mm in diameter, occupying between 25% - 40% of mill chamber volume.
SAG Mill Grinding Circuit Design
Restated, the designed SAG mill size and operating conditions typically control circuit throughput, while the ball-mill circuit installed power controls the final …
Choosing a SAG Mill to Achieve Design Performance
Choosing a SAG Mill To Achieve Design Performance. John Starkey1, Principal Consulting Engineer Sami Hindstrom2, Manager, Grinding Travis Orser2, Project Manager, Grinding. Starkey & Associates Grinding Design and Process Engineering 336 – 268 Lakeshore Rd. E. Oakville, Ontario L6J 7S4 PH: (905) 465-7512 Fax (905) 844-5297.
BOND RWi, BWi, CWi, Ai Work Index: What's the difference
The three tests are: The Bond ball mill work index (Wi BM, or BWi) conducted from a feed size of approximately 2 mm to a product size on the order of 100 µm. The Bond crushing (impact) work index (Wi C, CWi, LEIT or IWi) conducted on specimens of a nominal dimension between 50 mm and 75 mm. The product size is not …
SAG Mill Grinding Circuit Design
AG mills (or SAG mills with low ball charges) are often used in single-stage grinding applications. Based on their higher throughput and coarser grind relative to AG mills, it is more common for SAG mills to he used as the primary stage of grinding, followed by a second stage of milling. AG/SAG circuits producing a fine grind (particularly ...
Influence of feed size on AG / SAG mill performance
When the feed size of a SAG mill becomes coarser, i.e. α r increases, the energy required to break the ore increases, i.e. φ r and φ f increases (Morrell et al., 1996; Morrell and Valery, 2001 ...