# of the sag mills for pper minerals

### Authors John Starkey Starkey Associates Inc. and Mike

there is no comparable operating SAG mill treating ore that is this macro-competent. For Aurora the relationship between SAG and ball mill pinion energy is reversed in that the SAG mill requires less than half of the ball mill pinion energy using a transfer size T80 of 1.7mm and a final grind P80 of 90µ.

Get Price### Design for sampling—preliminary exploration

This paper makes the case that investment in sampling and SAG mill load sizing (usually an estimate). Flotation circuits Feed rates Feed grades sample of feed size— especially for AG/SAG mills. As both valuable minerals and moisture tend to be concentrated into finer size fractions it

Get Price### INNOVATION NEWS Mills and GMDsABB Group

This 6.4 MW GMD powered a 16 cement mill in Le Havre (France) which today some 40 years later is still operating. In the mid-1980s the GMD was introduced to the minerals market as the powerful and reliable drive system for SAG mills. Early SAG mills had a diameter of about 32 later increasing to 34 36 38 and 40 . At the same

Get Price### 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

Get Price### AG SAG Mill for Mineral Processing Wet Aerofall SAG

The SAG mill (AG mill) has a large diameter and a small length. It looks like a flat round drum. The diameter of the SAG mill is generally about three times its length. The diameter of the hollow pivots at both ends of the barrel of a SAG mill is large. This SAG mill design can facilitate large-sized materials to enter the barrel smoothly.

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system primary mills and secondary mills. In the second generation SAG mills re-placed the second and third stages of the crushing system and also the primary mills. Example configuration for the second generation. SAG and ball mill for the wet grinding of gold ore in the Dominican Republic.

Get Price### Overload Detection in Semi-Autogenous Grinding A

In these mills total charge volume occupies approximately 35 of the mill interior and the charge is lifted by lifter bars along the interior of the mill shell as the mill rotates. The primary objective for a SAG mill is to maximize the throughput of fresh ore.

Get Price### TECHNICAL NOTES 8 GRINDING R. P. KingMineral Tech

LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e c./ Watts (8.14) In equation 8.14 D is the diameter inside the mill liners and Le is the effective length of the mill including the

Get Price### A mill power equation for SAG mills SpringerLink

where m p is in kW D is internal mill diameter (meters) L is internal mill length (meters) J is total fractional charge loading of the mill J B is the fractional mill filling by balls ε B is the effective porosity of the charge taken as 0.3 ρ s and ρ b are true densities of rock and balls (tons per cubic meter) respectively w c is the weight fraction of rock in water and rock in

Get Price### AN OVERVIEW OF SINGLE STAGE Mineral Consultants

5 Low ball charge SAG mill high mill speed. (4 ball charge 90 Nc) A cross between AG and SAG for competent abrasive ores. As typically operated in RSA. 6 SAG mill (configurations 3 and 5 ) with recycle crusher Competent ores better suited to coarse grind sizes as circulating loads can be high 7 SAG mills treating partially or fully

Get Price### to Design and Supply the World s Largest SAG Mill in

Oct 05 2010 · has been selected to design and supply a 42ft x 25ft (12.8m x 7.6m) 28MW gearless SAG mill plus two 26ft x 42ft (7.9m x 12.8m) 15.6MW ball mills and two VTM-1500-WB VERTIMILLS® for Newmont Mining s Yanacocha Conga copper-gold project in Peru. The 42ft diameter SAG mill is the world s largest and the first of its kind.

Get Price### SAG Milling in Australia -Revised Submission

MW). It has been the industry standard for SAG mills above 13 MW capacity. However pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill (11 MW) is currently the largest twin pinion single drive mill installed in Australia.

Get Price### How Ball Mills Work (Engineering and Mining)YouTube

Jun 20 2019 · For both wet and dry ball mills the ball mill is charged to approximately 33 with balls (range 30-45 ). Pulp (crushed ore and water) fills another 15 of the drum s volume so that the total

Get Price### A comparison of SAG mill power models

The Morrell C-Model is a generalised tumbling mill model and is not specific to SAG mills. The model was adopted for use in the JK SimMet™ software package and this paper is based on the description in a JK Mineral Research Centre publication (Napier-Munn et al 1996).

Get Price### SAG mill ArchivesInternational Mining

Researchers from the Sustainable Minerals Institute s Julius Kruttschnitt Mineral Research Centre (JKMRC) say they are developing a soft sensor to overcome previously-accepted performance challenges facing SAG mills. SAG mills are a key asset for mineral processing operations as one of the critical stages of extracting mineral out of ore and

Get Price### Mill (grinding)Wikipedia

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.

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Autogenous mills or AG mills can accomplish the same size reduction work as two or three stages of crushing and screening. Often used in grinding at modern mineral processing plants AG mills reduce the material directly to the desired final size or prepare it for the following grinding stages.

Get Price### Multi-component AG/SAG mill modelScienceDirect

A comprehensive experimental campaign was conduct with the AMIRA P9O project to understand the behaviour of multi-component ores in AG/SAG mills (Bueno et al. 2010 Bueno et al. 2011a Bueno et al. 2011b. The results were then used in the development of a 2D phenomenological model described in this paper. 2. JKSimMet AG/SAG model overview

Get Price### AG SAG Mill for Mineral Processing Wet Aerofall SAG

The SAG mill (AG mill) has a large diameter and a small length. It looks like a flat round drum. The diameter of the SAG mill is generally about three times its length. The diameter of the hollow pivots at both ends of the barrel of a SAG mill is large. This SAG mill design can facilitate large-sized materials to enter the barrel smoothly.

Get Price### Used Process-plants For SaleGrinding Mills Crushers

6 00010 000 TPD CRUSHING/GRINDING CIRCUIT GOLD PLANT with 32 x 12 SAG Mill 14.5 x 28 Ball Mills 54" x 74" Gyratory 7 SH HD Cone Rock Breaker and More. Manufacturer ALLIS CHALMERS Inventory ID 18C-VI01

Get Price### Minerals Engineering InternationalPlant Operation News

FFE Minerals Awarded Gold Ore Grinding Mills in Mexico . Glamis Gold Ltd. has placed an order with FFE Minerals for a semi-autogenous (SAG) mill and ball mill. FFE Minerals scope includes the design and supply of (1) 24 -0" x 10 -6" SAG mill and (1) 15 -6" x 21 -6" ball mill to process 244 TPH of gold ore.

Get Price### Mineral Comminution fine / ultrafine grinding

Grinding Solutions offers an extensive range of comminution services ranging from SAG mill testing to fine and ultrafine grinding. Tests range from industry standards such as Bond Work Index Testing to cutting-edge techniques such as pulp chemistry monitoring to help optimise comminution circuits.

Get Price### Mineral Comminution fine / ultrafine grinding

Grinding Solutions offers an extensive range of comminution services ranging from SAG mill testing to fine and ultrafine grinding. Tests range from industry standards such as Bond Work Index Testing to cutting-edge techniques such as pulp chemistry monitoring to help optimise comminution circuits.

Get Price### AG millsMetso

Autogenous mills or AG mills can accomplish the same size reduction work as two or three stages of crushing and screening. Often used in grinding at modern mineral processing plants AG mills reduce the material directly to the desired final size or prepare it for the following grinding stages.

Get Price### TECHNICAL NOTES 8 GRINDING R. P. KingMineral Tech

LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e c./ Watts (8.14) In equation 8.14 D is the diameter inside the mill liners and Le is the effective length of the mill including the

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