The application. Industrial milling of mined ore – from large rocks and boulders to fine particles – is a demanding process. Massive semiautogenous mills – commonly known as SAG mills – use milling balls, as well as the weight of the ore itself, to break down the ore into smaller particles – a process known as comminution.
SAG Mill Charge. Defining the charge weight and height for fully autogenous grinding mill requires allowance for the ore specific gravity (and its variations) and accounting for the water content and the fine ore which will fill the interstitial spaces between the …
If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to ...
Most mills can be converted from metal liners to composite rubber liners. These liners combine the best characteristics of metal alloys and rubber to obtain a superior design for use in AG/SAG, grate discharge, overflow ball mills and grinding ball mills. By using special alloy steel segments moulded into rubber, composite plates
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.
AG/SAG mills for a given feed size distribution and feed rate (Morrell and Morrison, 1996). Hence when using JKSimMet in a design situation, the dimensions of the AG/SAG mill are adjusted until the load in the mill reaches 25 % by volume when fed …
Empty Mill w/Excessive RPMs Case 2. Empty Mill w/Good RPMs Case 3. Full Mill & Cascade Grinding m ill rotation 135O m Ball trajectory Bad Better Best! l iner strike energyl • Left plot shows the mill speed is too high resulting in "metal on metal" condition. • Center plot was the result of slowing the mill down but still unloaded.
SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
SAG Mill. Grinding Solutions offers the following tests for SAG mill testing and/or sizing. JKTech Drop Weight. The JKTech Drop-Weight Test measures the breakage characteristics of an ore for five size fractions in the range of 13 to 63 mm, at various energy inputs (0.1 to 2.5 kWh/t).
the mill weight calculation, particularly the kidney weight, M kidney [t], are found in earlier papers (Apelt et al., 2001a, Apelt et al., 2002b). The shell weight, M ... SAG mill total feed (SMTF) is calculated by mill model inversion. Solids Balance
The SAG mill's steel liners were failing to meet the required service life. To remedy the problem, the supplier had added more material to the liner design. But this created its own challenges, reducing the effective grinding volume and adding weight to the mill that was pushing bearing pressures dangerously close to limitations.
Mill trommels, whether used for sizing or scalping, play a vital role in your grinding circuit. Outotec's robust but light-weight trommel frames consist of carefully selected welded profiles that are covered in a protective layer of wear resistant rubber or polyurethane.
SAG mill discharge is screened with the oversize recycling via a gyratory cone crusher, while the undersize is diluted with water and fed to the primary cyclones for classification. ... [fraction] 0.179 0.02 11.11 16. MV,,,, mill weight measurement [t] 176 10.00 5.68 17. Msh,, mill shell weight [t] 64 5.00 7.81 18. MVkw, mill powerdraw ...
SE = SAG mill specific energy in kWh/t. T 80 = transfer size from SAG mill to ball mill. or the SAG mill product P 80, in millimetre. It is claimed that this equation is applicable to any SAG product size and includes fine grinding beyond 10 mesh (1.7 mm) product size. The correlation was good for four of the five SAG mills studied.
JKSimMet autogenous mill modelling program. The JKTech drop weight test provides ore-specific parameters which are used by the JKSimMet Mineral Processing Simulator software to analyse and/ or predict AG/SAG mill performance. The same test procedure also provides ore-type characterisation for JKSimMet crusher modelling.
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.
The mill will be driven by a Gearless Motor Drive (GMD) which at 28.0 MW is equal to the largest grinding mill power ever used in the mining industry. The SAG mill design is based on Outotec's proprietary grinding mill technology, developed over decades for maximum reliability and performance.
SAG mills semi autogenous grinding mills . 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 …
operation of SAG mills. SAG mills are currently the technology of choice in hard rock milling operations for reducing primary-crushed ore to ball mill feed. In recent years, the trend has been towards larger-sized SAG mills with diameters of 10.4 m (34 ft) and above, with the largest being 12.2 m (40 ft) 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
20' EGL SAG mill, a Raptor 900 pebble crusher and two 24' x 39'6" ball mills. Each mill is equipped with a 2 x 8500HP dual pinion drive system. The plant was designed to process 1585 h mtpof SAG feed. From startup, the mill struggled to meet the required production rates. Over time, a major initiative that involved
The pulp weight in the mill is obtained by subtracting the mill weight during the test from the empty mill weight, including the ball charge, at the start of the test. The pulp volume of the pulp in the mill is then calculated using the mill discharge …
The SAG mill discharge screen oversize conveyor measurement has also been utilised in a formulation that estimates a "mill discharge factor" parameter (Schroder, 2000) which is assumed to be or related to the maximum mill discharge rate coefficient, d 0 (h −1). 6.1. SAG mill weight measurement modelThe SAG mill weight is measured by load ...
In semi-autogenous grinding (SAG), the grinding mill inventory, (i.e. volume of total charge, volume of ball charge, etc.) is important in determining the optimum operating condition for maximum production (tph), minimum specific energy (kwh/t) or lowest cost ($/t). A two-dimensional graphical method is presented for determining the actual ball charge within …
Control of -SemiAutogenous Grinding(SAG) mill weight is an example of an important process that exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009).
on a SAG mill and ball mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure. The solution automatically controls ore master feed rate and water addition to increase throughput, while keeping mill load within
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 ...
SAG mills, the mill weight is tightly controlled around the required set . Page 15 . point. Again the control system works the mill harder by operating at a . higher speed range.
CITIC HIC has recently received following orders for grinding mills, One (1) SAG Mill Ø11m x 5.4m LG - 2 x 6500kW,...
Rubber engineering technologies. Our full-service facility is the Best-Equipped Rubber Laboratory for the mining industry in South-East Asia, managed by a team of highly experienced technical specialists with extensive international experience. Our extensive product testing includes: Dry and wet abrasion. Chipping and chunking.
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