08/09/2013· 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.

06/09/2013· In a way, the media size should be selected based on feed size and grate opening. Finer feed (i.e. 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 top-size is >100 mm, then typically a 5” ball is suitable. To date, I have not seen any clear evidence ...

SIZE: SAG milling grinding media are available in sizes from 4.0” to 6.5” or 105 mm to 160 mm. CHEMISTRY: The chemistry of the balls is controlled via a robust internal quality system with our bar suppliers to optimize physical properties.

26/11/2019· The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill’s ...

02/08/2013· Based on his work, this formula can be derived for ball diameter sizing and selection: Dm <= 6 (log dk) * d^0.5 where D m = the diameter of the single-sized balls in mm.d = the diameter of the largest chunks of ore in the mill feed in mm. dk = the P90 or fineness of the finished product in microns (um)with this the finished product is ...

* SAG mills are the machines with the highest reduction rate which performs crushing, grinding and washing together. It offers a much higher reduction ratio than 3-stage crushing and screening system. * Feeding material in the dimension of 200-300 mm, is reduced to d100: 2 mm and below. This capability increases the efficiency of the ball mill while reducing the circulating load of the system ...

06/09/2013· In a way, the media size should be selected based on feed size and grate opening. Finer feed (i.e. 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 top-size is >100 mm, then typically a 5” ball …

When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW. Our team of product engineers continually improves SAG/AG Mill designs in order to provide the most robust, safe, and efficient grinding mills …

01/01/2016· A typical SAG-HPGR-Ball mill circuit suggested by Patzelt et al. is ... mill size: 305 × 305 mm with four lifter bars 6.38 mm in height, 2. ore size: –55 mm + 38 mm, 3. sample mass: 3 kg, 4. speed of rotation: 70% of the critical speed, 5. rotation time: 10 min. The product is analysed for size and from the size distribution curve the T 10 value is determined. The specific grinding energy ...

* SAG mills are the machines with the highest reduction rate which performs crushing, grinding and washing together. It offers a much higher reduction ratio than 3-stage crushing and screening system. * Feeding material in the dimension of 200-300 mm, is reduced to d100: 2 mm and below. This capability increases the efficiency of the ball mill while reducing the circulating load of the system ...

The ball mill accepts the SAG or AG mill product. Ball mills give a controlled final grind and produce flotation feed of a uniform size. Ball mills tumble iron or steel balls with the ore. The balls are initially 5–10 cm diameter but gradually wear away as grinding of the ore proceeds. The feed to ball mills (dry basis) is typically 75 vol.-% ore and 25% steel. The ball mill is operated in ...

The SGI equation uses a transfer size between a SAG and ball mill; it is proposed that a synthetic transfer size of 2100 µm be used to model single-stage SAG mills. 5.9ˇ √˙˝ ˛ . ˚ 0.96 0.985˜ !"# ˝ $ ˝ √˙˝ %&’() (2) where: SGI is the SAG Grindability Index, minutes, P80 is the SAG hydrocyclone overflow 80% passing size, µm F80 is the milling circuit feed 80% passing size, µm ...

Sag Sag Mill Ball Size. Ball Mill And Sag Mill Rezidence Quadrio. Oct 12, 2017 sag mill make use of steel balls included with some large and hard rocks for grinding.These mills utilize the balls in making the large fragments of materials broken into pieces.The ball charge of a sag mill is about 9 to 20.This process takes place inside the large rotating drum of sag mill which is filled with balls.

Investigations were carried out in a laboratory ball mill having the size of DxL = 160x200 mm with a ribbed inside surface of the drum. The mill ball loading was 40% by volume, the rotation rate was equal to 85% of the critical speed. Balls were made from steel: S4146, extra high quality, having hardness 62 ± 2 HRC according to Rockwell. Grinding tests were carried out with the samples of ...

20/02/2017· Ball Motion inside a SAG Mill. Ball Motion inside a Ball Mill. Mill speed and grinding charge volume. The critical speed of a rotating mill is the RPM at which a grinding medium will begin to “centrifuge”, namely will start rotating with the mill and therefore cease to carry out useful work. This will occur at an RPM of ncr, which may be determined by the formula . where D is the inside ...

12/10/2017· The ball charge of a SAG mill is about 9% to 20%.This process takes place inside the large rotating drum of SAG mill which is filled with balls partially. Interior of the drum uses the lifting plates. These plates inside the drum are responsible for picking the grinding material up to fall down again throughout the rotations. Repeated collisions between the steel balls and raw materials (ore ...

The analysis of the influence of ball sizes in SAG grinding hasn't been developed in detail by considering the effect on process parameters inside the mill, grinding efficiency or internal classification. Historically a conventional grinding reference has been made on the empirical procedure developed by Azzaroni (1980). Further to Azzaroni's methodology, Sepulveda ( Sepulveda, 2007) developed ...

01/01/2016· A typical SAG-HPGR-Ball mill circuit suggested by Patzelt et al. is ... mill size: 305 × 305 mm with four lifter bars 6.38 mm in height, 2. ore size: –55 mm + 38 mm, 3. sample mass: 3 kg, 4. speed of rotation: 70% of the critical speed, 5. rotation time: 10 min. The product is analysed for size and from the size distribution curve the T 10 value is determined. The specific grinding energy ...

The SGI equation uses a transfer size between a SAG and ball mill; it is proposed that a synthetic transfer size of 2100 µm be used to model single-stage SAG mills. 5.9ˇ √˙˝ ˛ . ˚ 0.96 0.985˜ !"# ˝ $ ˝ √˙˝ %&’() (2) where: SGI is the SAG Grindability Index, minutes, P80 is the SAG hydrocyclone overflow 80% passing size, µm F80 is the milling circuit feed 80% passing size, µm ...

size, ball load, mill speed and % solids will represent the total load. Ball Mill SAG Mill Scw Jb Pc % -6" +1" N/Nc Fresh Feed Water Water Pebble Crusher Screen Cyclones Sump Pump Fig. 1. SABC A/B milling circuit. Scw = solid concentration by weight fraction in the SAG mill feed; Jb = balls charge (bulk fraction of the SAG mill volume); N/Nc = fraction of the SAG mill critical speed; Pc = SAG ...

Grinding media is grinding feed plus 4-12% ball charge (ball dia.100- 125 mm) High capacity (short retention time) Less sensitive to feed composition (critical size material) Semi-Autogenous Mill Note the size of the mill: Why does the diameter need to be so big? [image: (135-6-2)] SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG ...

Our SAG mill & ball mill media are designed and optimized for our customers’ milling environments to improve steel consumption, wear rates, throughput and grind. Tell me more about SGI’s products… 7. SAG Mill Grinding Media Designs. 5. Ball Mill Grinding Media Designs. 20mm - 160 mm. Grinding Media Ø Size Range. Contact SGI today for enquiries regarding our products. Contact SGI. Home ...

Sag Sag Mill Ball Size. Ball Mill And Sag Mill Rezidence Quadrio. Oct 12, 2017 sag mill make use of steel balls included with some large and hard rocks for grinding.These mills utilize the balls in making the large fragments of materials broken into pieces.The ball charge of a sag mill is about 9 to 20.This process takes place inside the large rotating drum of sag mill which is filled with balls.

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. Dry Aerofall mills are run at about 85% of the critical speed. The breakage of particles depends on the speed of rotation. Working with a 7.32 m diameter and 3.66 m long mill, Napier-Munn et al. [4] observed that the breakage rate for the finer ...

80was reduced from 240 mm (split ratio=1) to 45 mm (split ratio=0), ... Installing a 1000kW regrind ball mill increased plant capacity by 56% through treating 29% of the cyclone underflow and reduced the SAG mill specific energy from 20.66 to 16 kWh/t and the investment has a payback period of 1 year and a month, in 10 years the project would have earned the company more than 15 million ...

01/09/2013· gives the optimum composition of 40% 50.8 mm ball and 60% 25.4 mm balls for a 1 m diameter mill, and 27% 50.8 mm and 73% 25.4 mm for a 2 m diameter mill when grinding from a 90% passing 9.5 mm feed to an 80% passing 150 μm product. The portion of 50.8 mm balls decreases as the feed size or the product size decreases. However, this can be a ...