A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44′ (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. [9]

And because the ball mill feed grain size is larger, ball mill feeding groove must have a larger slope and height, so that feed smooth. Bearing. Since the power of the autogenous tumbling mill is relatively small, it is appropriate to choose dynamic and static pressure bearing. The ball bearing liner is made of lead-based bearing alloy, and the

Ball mill: When the particle size of the product is less than 0.5mm, the grinding effect of the ball mill is greater than that of a rod mill of the same specification. SAG mill: The SAG mill has a wide range of feeding particle sizes and can process larger minerals, but at the same time, its output particle size

Attrition mill is a type of grinding mill by kinds of media to crush lump to powder-like substances. The impact can be rock on rock such as in an Autogenous Grinding (AG) mill, rock and a small ball charge (~10%), used in Semi Autogenous Grinding (SAG) mills, balls of various sizes in Ball Mills and less commonly these days, steel rods in Rod Mills.

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 partially.

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Lets calculate/select/pick a new ball for your SAG mill. Now, lets suppose you have a SAG Mill and Ball Mill that are not drawing full kW Power. 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

SAG milling extends itself to many applications due to the range of mill sizes available. They can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill and some or all of the work done by a ball mill. SAG mills are also an optimum solution for wet grinding since crushing and screening in these

Dec 21, 2016 2 parallel SAG Mills each feeding 2 parallel Ball Mills (4 total). Around 50,000 TPD total grinding circuit capacity.

For example, the SAG mill may have 10 MW of power draw available and the two ball mills each of 7.5 MW of power draw available for a total of ratio of 10:15 (1:1.5). 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

Ball mill: When the particle size of the product is less than 0.5mm, the grinding effect of the ball mill is greater than that of a rod mill of the same specification. SAG mill: The SAG mill has a wide range of feeding particle sizes and can process larger minerals, but at the same time, its output particle size

In this case, the SAG mill design can do that. In general, the SAG mill manufacturers will control the addition amount of medium such as steel ball at 2-8%, so that the capacity of semi SAG mill to process materials can be increased by 10-30%. The SAG mill liners wear will increase by 15% due to the impact of medium such as steel ball during

ball mill and sag circuit mining diagram dec. AGSAG mills can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work of a ball mill Because of the range of mill sizes available AGSAG milling can often be accomplished with fewer lines than in a conventional rod millball mill circuit A diagram of types of AGSAG

SAG mill drive systems used on the same size grinding mill: ball mills, 18x27 drive with an air clutch. motor, $602,000 6050 D Primary SAG, 34x1 6 Two vafiable speed dc motors coupled mill, $4 million 22,500 to a gear drive with air clutches. motor, $1.28 million each 6000

W Total = WSAG + W Ball Mill (2) Where W is the grinding mill work input in kWh/t. For the above reason, the Starkey SAG mill was built in 1991 to measure the energy required to grind ore to a size of 80% passing 10-mesh or 0.17 mm (T80) by grinding small drill core samples to precisely that size.

Overflow discharge ball mill can grind ores into the size under 0.2 mm, so it is very suitable for the second grinding system. The capacity of it is about 15% lower than grate discharge ball mill in the same specification, and the loaded grinding medium is also less than that one. Rod mill Fote rod mill

Glass balls or ceramic balls (such as vertical ceramic ball mill) can also be used according to the grinding requirements. For the case where the finished product has special purity, the grinding medium can also be the raw material with a larger size (such as SAG mill).

Feb 01, 1994 With the ball mill power specified, a ball mill of appropriate dimensions can be selected. At this stage no "insurance" allowances have been made in the design. After the following discussion on breakage mechanisms in the SAG mill the implications of getting the SAG mill product size wrong will 144 G. JOHNSON et al. become clear, and the

Nov 19, 2019 When the rod mill speed is lower than the working speed of the same size ball mill, the medium in the rod mill is in a sloping working state. For the ball mill, depending on the specific requirements, you can choose the overflow type and grate type of discharge method. 5 Ways to Control the Ball Mill Noise

However, in this situation the ball mill has to supply this energy and it has a different (higher) work index than the crusher (ie the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction). Hence from equation 7, to crush to the ball mill circuit feed size

SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

SAG mill (4.6 MW installed power) to produce 3,000 mtpd. The circuit was to be expanded in later mine life through the addition of an 18 ft diameter by 29.5 ft ball mill (also 4.6 MW installed power) in order to double the throughput. KEYWORDS Feasibility Study, Grindability Testing, SAGDesign, Turnaround Time AUTHORS

US3180581A US210975A US21097562A US3180581A US 3180581 A US3180581 A US 3180581A US 210975 A US210975 A US 210975A US 21097562 A US21097562 A US 21097562A US 3180581 A US3180581 A US 3180581A Authority US United States Prior art keywords trommel discharge annulus mill opening Prior art date 1962-07-19 Legal status (The legal status is an assumption and is not a

identify where the opportunities were greatest and what effect the combined changes would have on mill performance. Initially, the focus was to reduce the SAG mill feed size while processing the lower tonnage Subika ore and improve the grinding circuit product size while processing the ball mill

Ball mill: When the particle size of the product is less than 0.5mm, the grinding effect of the ball mill is greater than that of a rod mill of the same specification. SAG mill: The SAG mill has a wide range of feeding particle sizes and can process larger minerals, but at the same time, its output particle size

SAG mill (4.6 MW installed power) to produce 3,000 mtpd. The circuit was to be expanded in later mine life through the addition of an 18 ft diameter by 29.5 ft ball mill (also 4.6 MW installed power) in order to double the throughput. KEYWORDS Feasibility Study, Grindability Testing, SAGDesign, Turnaround Time AUTHORS

ball mill and sag circuit mining diagram dec. AGSAG mills can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work of a ball mill Because of the range of mill sizes available AGSAG milling can often be accomplished with fewer lines than in a conventional rod millball mill circuit A diagram of types of AGSAG

other methods. The ball mill correction factor (CFnet) is empirical and one way of estimating it was presented by Amelunxen at the Procemin 2013 Short Course by Doll & Amelunxen. 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

Overflow discharge ball mill can grind ores into the size under 0.2 mm, so it is very suitable for the second grinding system. The capacity of it is about 15% lower than grate discharge ball mill in the same specification, and the loaded grinding medium is also less than that one. Rod mill Fote rod mill

Nov 19, 2019 When the rod mill speed is lower than the working speed of the same size ball mill, the medium in the rod mill is in a sloping working state. For the ball mill, depending on the specific requirements, you can choose the overflow type and grate type of discharge method. 5 Ways to Control the Ball Mill Noise

AG/SAG Wio, AWio (kWh/t) 28.5 Ball Mill Wio, BWio 8.6 Circuit Wio, OWio 14.6 Bond Ball Mill Work Index, BWi, kWh/t 13.4 Bond Rod Mill Work Index, RWi, kWh/t 18.1 Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have

However, in this situation the ball mill has to supply this energy and it has a different (higher) work index than the crusher (ie the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction). Hence from equation 7, to crush to the ball mill circuit feed size

US3180581A US210975A US21097562A US3180581A US 3180581 A US3180581 A US 3180581A US 210975 A US210975 A US 210975A US 21097562 A US21097562 A US 21097562A US 3180581 A US3180581 A US 3180581A Authority US United States Prior art keywords trommel discharge annulus mill opening Prior art date 1962-07-19 Legal status (The legal status is an assumption and is not a

The ball mill dimensions are 4.8 x 11.75 m. The ball load and pulp load have a significant influence on the ball mill product size and production capacity. but at the same time increase

Aug 18, 2019 Supplementing the ball mill media according to changes in ball mill current, grinding sound, output and quality during daily production. Generally, a warehouse can be used with 3-4 grade balls, and fine grinding bins can be 2-3 grades. Three types of ball mill grinding. Control the fineness of the finished product

The design of mill liners and SAG mill discharge grates will have a large effect on how efficiently the mill operates and the circuit throughput. All models generally assume that a mill is fitted with "efficient" liners and that the grate design neither limits passage of pebbles (and pulp) nor permits re-circulation of pulp back into the mill.

ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION SEMI throughput, make-up ball size, mill speed, liner profile and ball addition rates. At the same time, it can also be used to design balls and liner systems that can survive longer in Figure 5.13 Comparison of impact spectra with ball size at 20% mill filling and 70% mill

Comminution circuits for mining have evolved from basic circuits consisting of simple crushing machines to the current multistage, semi-autogenous (SAG) and ball mill circuits. This progression, however, has not always been accompanied by an improvement in the efficiency of power usage in achieving the target grind size.

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