While model-based approaches have been reported for mill control (Sandoz et al., 1999), it was felt that owing to the high variable and disturbance dominated nature of the SAG operation, a rule based approach would deliver more robustness.

2010; 2011). For each grain size there is an optimal ball size (Trumic et. al., 2007). The bigger ball in relation to the optimal one will have an excess energy, and consequently, the smaller ball mill has less energy necessary for grinding. In both cases, the specific power consumption increases and the grinding capacity decreases

The screen oversize is returned to the primary mill feed. This allows the operator to see and measure the plus 13 mm circulating load of critical size material. If the secondary mill is a pebble mill, grinding media for the pebble mill may be removed from the top deck of the screen with any excess returned to the primary mill.

• two stage crush, ball mill, e.g. Pajingo. • a crushing circuit including high pressure grinding rolls (HPGR) at Argyle Diamond Mine. Recent feasibility studies for the Boddington Expansion Project have considered the use of HPGR for hard rock multi-stage crushing and ball mill circuits at high tonnage rates (Parker et al, 2001).

1607Cadia Hill 17.5 Englehardt et al, SAG 2011 speaker notes 1608Ridgeway 18.7 Englehardt et al, SAG 2011 speaker notes 1609Cadia East 20.3 Englehardt et al, SAG 2011 speaker notes 164353392-2 13 SGS Lakefield Alacer Gold NI43-101 July 29, 2014 4

Dec 30, 2016· Looking for leakers on SAG Mill shell. Jim Rickards: economic freeze is here, get gold, silver if you can and get ready - Duration: 25:41. Kitco NEWS Recommended for you. New

To use the Bond ball mill work index to determine the ball mill specific energy required for a particular ... et al, 2009. Figure 4: A*b vs SAG kWh/t for operating AG/SAG mills (after Veillette and Parker, 2005) 0 2 4 6 8 10 12 14 16 18 ... AG and SAG Mill Circuit Selection and Design by Simulation, in .

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An increase of over 10% in mill throughput was achieved by removing the ball scats from a single-stage SAG mill. These scats are non-spherical ball fragments resulting from uneven wear of balls with included porosity. 30t of scats were removed from a total charge load of 70t. Surveying and modelling the mill revealed that the breakage rates

Inventory ID: 6C-CM02. UNUSED 22' x 38' (6706mm x 11582mm) Ball Mill, 10,000 kW (13405 HP) Twin Pinion 50 Hz Motors and Gear Reducers

30 mm. Installed grinding power is split equally between the two mills with the SAG mill fitted with a variable speed drive (VSD). SAG discharge screen oversize (‘pebbles’ or ‘scats’) was recycled through an 185 kW pebble crusher. The circuit was characterised by a high circulating load around the ball mill…

AG/SAG mill based circuits and this has impacted on the ability of companies to obtain funding. Bailey et al. (2009) published guidelines on the use of typical SAG mill-based circuit design methods, with particular focus on the use (and misuse) of JKSimMet.

The product size distribution is narrower than a ball mill but significantly coarser. Most are overflow discharge type. Length-to-diameter= 1.4 to 2.3. Mill length = 7 meters. Rod Mill-Ball Mill Circuits Diagrams of mill circuits [image: (135-8-2)]

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

of large AG/SAG mills and large ball mills. However, it is necessary to discuss their operation because a Rod mill product has a similar slope to AG/SAG mills. This product slope averages less than 0.5 when plotted on log/log paper and therefore contains an extra amount of ne material fi compared to a PSD, having a 0.5 slope. This fi ne material,

Oleg D. Neikov, in Handbook of Non-Ferrous Metal Powders, 2009. Tumbling Ball Mills. Tumbling ball mills or ball mills are most widely used in both wet and dry systems, in batch and continuous operations, and on a small and large scale.. Grinding elements in ball mills travel at different velocities. Therefore, collision force, direction and kinetic energy between two or more elements vary ...

The main grinding circuit at Les Mines Selbaie consists of two mills, one SAG mill in closed circuit with an 8’ x 20’ vibrating screen with 700 micron deck, and one ball mill. The SAG mill is 8.23m (27’) diameter x 3.75m (12.3’) long. The Holt-McDermott grinding circuit uses a large primary SAG mill which is 5.03m (16.5’) diameter x

Oct 22, 2012· Before the Esperanza order, FL’s largest SAG mill measured 38’ and its ball mills, 26’. To the average person, the difference between a 38’ and a 40’ SAG … Autogenous mills, semi-autogenous mills and ball mills for wet … SAG and ball mill for gold ore grinding. One of three SAG mills with 9.75 m diameter and 2 x 4000 kW drive power.

8 Ft x 21 Ft Traylor Ball Mill, one extra head in good condition, Bull Gear: 266 tooth excellent condition, Pinion: 20 tooth one spare pinion in good condition, 500hp Synchronous Motor, speed 300 RPM, 4000v, spare Bearing Housings, One spare motor, single door but could support a second door, two complete sets of new rubber liners, shell can be resize to any size.

FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 0.5 1 1.5 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore’s compentency. Figure 8 plots this ratio versus UCS; no trend is apparent ...

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

the ball mill; this can be caused for example by required inspections performed on the SAG mill (shell, bearings, etc.), which leads to a relative short shutdown of the SAG mill. If the ball mill would be equipped with fixed speed motors, then they will have to be washed out, isolated and stopped.

CSIRO Minerals has used non-intrusive, shell-mounted (contact) accelerometers to scan load behaviour in industrial SAG/AG mills (Spencer et al 1999 (Spencer et al , 2000 (Spencer et al ...

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. ... Romankov et al. ... A ball mill is an effective means of dispersing solid materials in solids or liquids. 8, 9 Ball mills have several advantages which include versatility, low cost of labor ...

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 …

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semi-autogenous (SAG) mill and two ball mills, each with 13 megawatts (MW) of installed power, was expected to be SAG mill limited when treating competent basement rock. Ausenco Services Pty Ltd (Ausenco), was engaged to help optimise and enhance the productivity of the Phu Kham comminution circuit over an eight-month period.

Steyn et al. (2010) explains the Anglo American Platinum (AAP) control philosophy for Run-of-Mine ball mills as implemented at Mototolo Joint Venture. This includes a layered approach that involves synchronizing the regulatory and supervisory control layers. The latter is administered by a rule-based administrator that allows on-

upsets such as mill spills and/or power excursions in SAG mills, “centrifuging” in ball mills, etc. The constant need to adjust plant operation objectives because of frequent problems with equipment upstream (such as primary crushers) or downstream (such as performance of ... Gopinath, Mathur et al, 1995 and Le Page, Freeman et al 1996 ...

Apr 22, 2016· Mechanochemistry using ball mills is a promising technique with applications in organic and inorganic chemistry as well as material sciences [1–4].During ball milling, up to 80 % of the energy that is generated in the mill is dissipated as heat [].This is why measurement and control of the temperature in the ball mills is important, for example, if heat-sensitive products are formed that ...

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