selection criteria for sag mill

selection criteria for sag mill

Mill drives: the desire for increased power and the ...

Mill drives: the desire for increased power and the ...

2020-10-3 · SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option

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Choosing a SAG Mill to Achieve Design Performance

Choosing a SAG Mill to Achieve Design Performance

2013-5-6 · SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates. Typical tests required to define a hardness variability function, are given below in Figure 1.

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Model predictive control of semiautogenous mills …

Model predictive control of semiautogenous mills …

2020-6-25 · The selection of controlled and manipulated variables took into account performance and functional criteria. The power draw, volumetric filling level, and a size reduction percentage were the controlled variables, while the fresh ore feed rate, fresh water feed rate, and the SAG rotation speed were the manipulated variables.

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AG

AG

2020-11-5 · Table of ContentsSAG Mill ChargeSAG Mill Horsepower — Drive PowerOre Testing for AG & SAG Grinding Mill Design Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semi-autogenous grinding, it can be used to establish the exact grinding circuit and mill size. In the pilot plant tests, the tare power of the pilot plant mills should be determined ...

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CMP Paper 16.10.09 Final

CMP Paper 16.10.09 Final

2018-5-9 · When mill diameter and mill power became again increased, only the Gearless Mill Drive (GMD) could be envisaged to cover this requirement above 10 MW. The GMD is by its nature a variable speed drive system. Process operators, once having the facility of adjustable speed, could not live anymore without it for SAG mills.

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Key considerations when selecting a mill lining system

Key considerations when selecting a mill lining system

Figure 1: Sliding-abrasion action in a Ball Mill. Figure 2: Cascading-impact action in a SAG mill. Rubber and composite mill lining systems. In the past, grinding mills were typically lined with cast metal linings of varying steel or iron alloys, and lining system selection was …

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THE EYES HAVE IT: IMPROVING MILL AVAILABILITY …

THE EYES HAVE IT: IMPROVING MILL AVAILABILITY …

2015-10-10 · running SAG/AG mill, using a MillWatch Camera Unit and the Kaltech iBolt, the intelligent mill liner bolt. The considerable and demonstrable value that these tools bring when used in concert is discussed in detail, as are the other possible uses for this technology in …

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Modelling SAG milling power and specific energy ...

Modelling SAG milling power and specific energy ...

2017-12-14 · mill diameter, mill length, grates openings, and pebble ports size; the power equation is also function of all the operational variables selected for this study. The applied force is a function of the mass inside the mill and it is composed of balls, ore and water. The ball charge is a function of the bulk fraction of the SAG mill volume (Jb)

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ARE SAG MILLS LOSING MARKET CONFIDENCE?

ARE SAG MILLS LOSING MARKET CONFIDENCE?

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. A follow up paper by Lane et al. in

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Mill drive selection for semiautogenous grinding mills

Mill drive selection for semiautogenous grinding mills

2019-11-14 · Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pin-ions, 3.7 MPa (5000 hp). The exception to this design was the Hibbing taconite operation. It used two4.47 MPa (6000 hp) motors to drive a 1I-m-diam x 4.5-m long (36-ft-diam x 15 ft) autogenous mill. However, recent SAG mill designs now ...

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sag mill foundation design criteria

sag mill foundation design criteria

SAG Mill Liner Design Know More. 18 Oct 2018 Pulp-lifter design can be a significant consideration for SAG mills, particularly for large mills. As mill Catastrophic damage to structural elements can result. A good discharge end design should meet the following criteria:....

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AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill ...

AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill ...

Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75 – 106 microns.; The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 – 250 microns.; The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges ...

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FLS TMS2010 Final

FLS TMS2010 Final

Specific Power Comparison Circuit Specific Power Consumption (kWh/t) Rod/Ball in open circuit 8.0 to 12.0 Rod and ball mill in closed circuit 6.0 to 9.0 Single stage closed circuit ball mill 5.5 to 8.5 Open Circuit rod mill 4.0 to 6.0 SAG 8.5 to 13.0 SAG/ Ball Circuit 8.0 to 12.0 Comparison of Other Criteria In the final selection of the most ...

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Selection Criteria For Sag Mill Drive System

Selection Criteria For Sag Mill Drive System

Lection Criteria For Ball Mill . A summary of the SAG Mill Design Criteria recommended by Davy is given in Table 4. .. Chat With Sales. selection criteria for coal mill – Grinding Mill China. selection criteria for coal mill [ 4.8 - 4884 Ratings ] The Gulin product line, consisting of more than 30 machines, sets the standard for our industry.

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Selection Criteria For Ball Mill Htm-ball Mill

Selection Criteria For Ball Mill Htm-ball Mill

Key Considerations When Selecting A Mill Lining System. Jan 27 2020 figure 1 slidingabrasion action in a ball mill figure 2 cascadingimpact action in a sag mill rubber and composite mill lining systems in the past grinding mills were typically lined with cast metal linings of varying steel or iron alloys and lining system selection was typically driven by level of wear protection and cost

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GEOMETALLURGY APPLIED IN COMMINUTION TO …

GEOMETALLURGY APPLIED IN COMMINUTION TO …

The selection of wrong design criteria occurs mainly due to lack of quality testwork or misinterpretation of results and orebody variability. ... The trade-off economics of SAG mill and HPGR-based circuits were primarily determined for the average ore hardness, and then the

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Chapter

Chapter

2013-5-9 · 2.1 SAG mill modeling In MODSIM, one of the simulation models used for a SAG mill unit is SAGT (Semi-Autogenous Grinding with Trommel) model. In this model, a SAG mill with a trommel screen at mill discharge is modeled using the full population balance including particle attrition and …

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selection criteria for sag mill drive system

selection criteria for sag mill drive system

SAG is an acronym for semiautogenous 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' in diameter, powered by a 28 MW (38,000 HP) motor.

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The Selection and Design of Mill Liners

The Selection and Design of Mill Liners

multi-stream plants, where mill liner design and selection is only tackled on a cost consumables basis. However, the gains to be had through good liner design and selection are just as great as on the large SAG mills. This paper looks at recognising problems in liner design and selection in …

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(PDF) Design of the 40 foot diameter SAG mill …

(PDF) Design of the 40 foot diameter SAG mill …

PDF | On Sep 1, 2001, R. Dunne and others published Design of the 40 foot diameter SAG mill installed at the Cadia gold copper mine | Find, read and cite all the research you need on ResearchGate

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selection criteria for sag mill drive system

selection criteria for sag mill drive system

Selection criteria for SAG mill drive systems The cho of a drive system is independent on the size of the mill, its critical speed, and the horsepower required. Several areas of concern are outlined for each drive-system design. A criterion for selecting the best design for large mills is developed.

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THE COMMINUTION CIRCUIT DESIGN FOR THE …

THE COMMINUTION CIRCUIT DESIGN FOR THE …

2018-2-20 · feed size (F80) of over 70 mm and a SAG mill throughput of 5200 t/h. The Batu Hijau SAG mill specific energy was a function of point load test and RQD. The point load test substitutes for Axb measurement in that relationship. The Batu Hijau ore is less fractured than the Constancia ore based on the average RQD data and Constancia’s SAG mill ...

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Mill Charge

Mill Charge

In Mineral Processing Design and Operations (Second Edition), 2016. 9.3.4 Mill Speed. During normal operation the mill speed tends to vary with mill charge.According to available literature, the operating speeds of AG mills are much higher than conventional tumbling mills and are in the range of 80–85% of the critical speed.

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SAG MILL GRINDING DESIGN VERSUS GEOMETALLURGY …

SAG MILL GRINDING DESIGN VERSUS GEOMETALLURGY …

2013-5-6 · The SAG test reproduces commercial SAG mill grinding conditions on 4.5 L of ore and determines the SAG mill pinion energy needed to grind ore from 80% passing 152 mm to 80% passing 1.7 mm, herein referred to as macro ore hardness. The SAG mill product is then crushed to passing 3.35 mm and is subjected to

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Cooling tower basics calculation formulas | Cooling …

Cooling tower basics calculation formulas | Cooling …

2018-11-14 · In this article explained about basic concepts of cooling tower, types of cooling towers, formula for cooling tower efficiency. Also brief about Cooling tower mass balance of make-up water requirement in system, Drift Losses or Windage, Evaporation losses & Blowdown or Draw off.

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Gold extraction

Gold extraction

2019-6-28 · A 20Mt/a mill will have a capital cost within $10,000 /t/h and $20,000 /t/h (Lane, Fleay, Reynolds, & La Brooy, 2002). Typical operating costs for mills used in gold extraction are summarized in Table 3. The selection of a mill size is ultimately a function of the economics of the project and which mill size will maximize the project NPV.

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Feasibility study plant design

Feasibility study plant design

2005-1-1 · It is impossible to generalize on the selection criteria between multi-stage crushing/ball mill and primary crush/SAG/ball mill circuit selection. A detailed comparison needs to be conducted for each circuit. Recent comparisons have indicated that the capital and operating costs for three-stage crushing can be favourable.

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Ring-geared mill drives

Ring-geared mill drives

Mill application features. Frozen charge protection – Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Stand-still detection – Prevents the motors from re-starting if the mill is still rocking or moving after a stop ...

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Crushing Plant Design and Layout Considerations

Crushing Plant Design and Layout Considerations

2016-2-24 · circuits, on both greenfield and retrofit projects, to increase feed rate to the SAG mill. In other words, crushing plants, from primary to quaternary circuits, are here to stay. There are three main steps in designing a good crushing plant: process design, equipment selection, and layout.

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