### SAG Mill Grinding Circuit Design - 911metallurgist

2016-6-6 The ratio of the trunnion thickness to trunnion diameter in a mill of 2,134 m diameter is almost twice that of a mill of 5,8 m diameter, i.e. a ratio (T/D) of 0,116 to 0,069 for the large mill. However the design stress levels at the trunnion/head transition in the case of the large mill are almost 250% of those in the small mill.

More### how to calculation critical speed of sag mill

2018-4-17 Obviously, the SAG mill is consuming more and the ball mill less power than was predicted by the empirical method, but the overall total is 99.5% of the predicted total. ... ball mill calculation of a ball mill load Quarry Crusher Machine For TON crushing equipment is designed to achieve maximum productivity and high reduction ratio.

More### What's the Difference Between SAG Mill and Ball Mill ...

2019-11-26 SAG mill vs Ball mill Crushing ratio. The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of

More### Mill Charge - an overview ScienceDirect Topics

Rod mill charges usually occupy about 45% of the internal volume of the mill. A closely packed charge of single sized rods will have a porosity of 9.3%. With a mixed charge of small and large diameter rods, the porosity of a static load could be reduced even further. However, close packing of the charge rarely occurs and an operating bed ...

More### Reduction Ratio - an overview ScienceDirect Topics

Friction reduction ratio is the function of the average velocity of fracturing fluid, the gelled agent concentration, and the proppant concentration. Based on the linear regression of 1049 experimental and field data, Lord et al. put forward the following empirical formula to calculate the friction reduction ratio of HPG fracturing fluid (Lord, 1987):

More### AG - Autogenous SAG Semi-Autogenous Mill Design

2018-4-17 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 before and after each test run. The tare power should be for the empty mill.

More### Optimization of a SAG Mill Energy System: Integrating

2019-7-1 An optimization is carried out to minimize the yearly cost of energy for the operation of the SAG mill. This cost includes the energy consumption cost in $/kWh and the capital cost for the PV-BESS infrastructure, prorated over the life of the battery system, accounting for the discount rate through an annuity factor (Pamparana et al. 2019a, b).The energy requirements are defined by the SAG ...

More### (PDF) Acoustic emissions monitoring of SAG mill

ACOUSTIC EMISSIONS MONITORING OF. SAG MILL PERFORMANCE. S.J. Spencer, J.J. Campbell, K.R. Weller and Y. Liu. CSIRO Minerals, PO Box 883,

More### The engineering and process effects of choosing a motor ...

2021-8-20 The SAG mill power draw model of Austin (using the cali-bration by Doll, 2013) is used to predict the process power draw at the mill shell, Pshell, and the efficiency losses for the drive’s mechanical components based on Doll (2012) are used to determine the motor output power, P. The effect of varying the mill speed as a fraction of the critical

More### Caluclating Forging Reductions Forging

2006-10-26 A: Forging reduction is generally considered to be the amount of cross-sectional reduction taking place during drawing out of a bar or billet. The original cross-section divided by the final cross-section is the forging ratio (say 3:1). There is an equivalent reduction on upsetting for forgings being upset during forging (gear blanks, for example).

More### how to calculation critical speed of sag mill

2018-4-17 Obviously, the SAG mill is consuming more and the ball mill less power than was predicted by the empirical method, but the overall total is 99.5% of the predicted total. ... ball mill calculation of a ball mill load Quarry Crusher Machine For TON crushing equipment is designed to achieve maximum productivity and high reduction ratio.

More### processing plant using dry aerofall sag mill

processing plant using dry aerofall sag mill meaning of sag mill . processing plant using dry aerofall sag mill grinding circuit design at kubak using spi and bond Ciros crushing equipment is designed to achieve maximum productivity and high reduction ratio From large primary jaw crusher and impact crusher, processing plant using dry aerofall ...

More### [Solved] Compare and contrast the working principle of a ...

CRUSHING RATIO- The crushing ratio of a SAG mill is larger than the ball mill; the former can reach up to 3,000:1 while the latter is known to operate up to a maximum of 200:1 size reduction ratios. FEED CHARACTERISTIC- As previously stated, SAG mills have feed materials that are of significant hardness compared to the feed material of ball mills.

More### The Effect of Aspect Ratio on the Grinding Efficiency of ...

and Closed Circuit AG/SAG Mills S Morrell1 ABSTRACT The aspect ratio (mill diameter/mill length) of autogenous and semi autogenous mills varies widely and can be as high as three or as low as 0.5. The literature on the subject of what effect aspect ratio has on grinding mill performance or energy efficiency is almost non-existent.

More### The engineering and process effects of choosing a motor ...

2021-8-20 The SAG mill power draw model of Austin (using the cali-bration by Doll, 2013) is used to predict the process power draw at the mill shell, Pshell, and the efficiency losses for the drive’s mechanical components based on Doll (2012) are used to determine the motor output power, P. The effect of varying the mill speed as a fraction of the critical

More### (PDF) Multi-component AG/SAG mill model

Tracking the mill performance showed that the mill power consumption decreased from 9.49 to 6.63 kWh/t (a nearly 30% reduction), P80 of the mill product decreased from 611 to 355μm, and the mill ...

More### (PDF) Acoustic emissions monitoring of SAG mill

ACOUSTIC EMISSIONS MONITORING OF. SAG MILL PERFORMANCE. S.J. Spencer, J.J. Campbell, K.R. Weller and Y. Liu. CSIRO Minerals, PO Box 883, Kenmore, QLD 4069, Australia. ABSTRACT. Particle grinding ...

More### MILLING CONTROL OPTIMISATION - Mintek

2012-2-7 Figures 8 and 9 on the right show results from a gold plant’s SAG mill achieved with MillStar’s Segregated Ore Feed Controller combined with the Power Optimiser: • The standard deviation of the mill feed control is greatly reduced. • The cyclone feed is more stable, allowing for consistent size separation and feed to downstream processes.

More### Caluclating Forging Reductions Forging

2006-10-26 A: Forging reduction is generally considered to be the amount of cross-sectional reduction taking place during drawing out of a bar or billet. The original cross-section divided by the final cross-section is the forging ratio (say 3:1). There is an equivalent reduction on upsetting for forgings being upset during forging (gear blanks, for example).

More### Rolling of Metals

2015-5-12 •Maximum draft possible: h o –h f = m2R •Coefficient of friction m •Roll radius R •The strip thickness is reduced at each rolling pass and the strip width increases slightly (around 2%) •h 0 V 0 w 0 = h f V f w f. Typically w f = 1.02 w 0

More### sag mill ball size - Kettenreime

2021-9-30 SAG Mill Ball Sizing Grinding Classification Circuits. With high aspect ratio SAG mills total charge to ball charge ratio should be greater than 2 up to 25 for a coarse mill feed say F80 110 mm If the mill feed size is fine say 50 mm or 30 mm then you are looking at a total charge to ball charge ratio of about 1516

More### Page 1 Page 2 INTRODUCTION SAG

2014-10-1 Reduction in the high capital cost associated with comminution circuits ... limitations are the single stage AG/SAG mill circuit and the rod mill circuit. However, all circuit types eventually reach a maximum single . ... maximum size of quality steel rods and the required aspect ratio of the mills. This typically has the effect of limiting the ...

More### AMIT 135: Lesson 6 Grinding Circuit – Mining Mill

The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG 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.

More### SAG Mill Testing - Test Procedures to Characterize Ore ...

SAG MILL TESTING - AN OVERVIEW OF THE TEST PROCEDURES AVAILABLE TO CHARACTERIZE ORE GRINDABILITY AUTHOR: F.O. VERRET, G. CHIASSON AND A. MCKEN - SGS KEYWORDS Comminution, grindability, grinding, SAG mill, AG mill, milling, HPGR, work index, pilot plant INTRODUCTION The resistance of ore samples to breakage (or hardness) is

More### The Effect of Aspect Ratio on the Grinding Efficiency of ...

and Closed Circuit AG/SAG Mills S Morrell1 ABSTRACT The aspect ratio (mill diameter/mill length) of autogenous and semi autogenous mills varies widely and can be as high as three or as low as 0.5. The literature on the subject of what effect aspect ratio has on grinding mill performance or energy efficiency is almost non-existent.

More### (PDF) Multi-component AG/SAG mill model

Tracking the mill performance showed that the mill power consumption decreased from 9.49 to 6.63 kWh/t (a nearly 30% reduction), P80 of the mill product decreased from 611 to 355μm, and the mill ...

More### The engineering and process effects of choosing a motor ...

2021-8-20 The SAG mill power draw model of Austin (using the cali-bration by Doll, 2013) is used to predict the process power draw at the mill shell, Pshell, and the efficiency losses for the drive’s mechanical components based on Doll (2012) are used to determine the motor output power, P. The effect of varying the mill speed as a fraction of the critical

More### Mill power draw models - SAGMILLING.COM

2020-3-22 Most mills (outside of Australia) use synchronous motors. These motor have the following characteristics (in general) The maximum power indicated on the name-plate is the power on the output shaft of the motor (or mill shell for gearless). The maximum power indicated can only be evolved at the rated speed indicated on the name-plate.

More### Caluclating Forging Reductions Forging

2006-10-26 A: Forging reduction is generally considered to be the amount of cross-sectional reduction taking place during drawing out of a bar or billet. The original cross-section divided by the final cross-section is the forging ratio (say 3:1). There is an equivalent reduction on upsetting for forgings being upset during forging (gear blanks, for example).

More### Rolling of Metals

2015-5-12 •Maximum draft possible: h o –h f = m2R •Coefficient of friction m •Roll radius R •The strip thickness is reduced at each rolling pass and the strip width increases slightly (around 2%) •h 0 V 0 w 0 = h f V f w f. Typically w f = 1.02 w 0

More