# typical load factor for sag mill motor

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### SINGLE STAGE SAG/AG MILLING DESIGN - Metallurgy

One factor that requires exploration in the piloting phase may be mill speed. If high circulating loads are still encountered following experimentation with the mill density, the effect of reducing mill speed should be assessed. The rate of abrasion grinding may be slower than the rate of impact breakage and the two can be brought into equilibrium by decreasing the impact force available

Get Price### Belt Conveyors for Bulk Materials - Fifth Edition - Chapter 6

and seal resistance. A typical idler roll equipped with antifriction bearings and sup-porting a load of 1,000 lbs will require a turning force at the idler roll periphery of from 0.5 to 0.7 lbs to overcome the bearing friction. The milling or churning of the grease in the bearings and the bearing seals will require additional force. This force,

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### Autogenous and Semi-Autogenous Mills -

01.01.2016· Some dry autogenous mills operating in Canada are 8.5 m in diameter and 1.5 m in length. These are known as Aerofall mills. The Cadia Hill (Australia) wet SAG mill is 12.2 m in diameter with a 20 MW motor and in 2004 was the largest diameter mill in operation in the world.

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I R 1 2 3 4 5 6 7 8 9 10 11 12 13 T 14 15 16 PHONE: 516.328.3300 • FAX: 516.326.8827 • WWW.SDP-SI.COM 01 Inch BALL & ACME LEAD SCREW TECHNICAL INFORMATION This

Get Price### AMIT 135: Lesson 5 Crushing – Mining Mill

Size is specified in terms of the gape and width, typically listed as gape x width. Largest jaw crusher is 1600 x 2514 mm with motor ratings of 250-300 kW. crushers (C200 series) are 1600 x 2514 mm with motors rated at 400 kW. The largest particle that can enter the opening of the jaw crusher can be estimated by: Largest particle size= 0

Get Price### Flicker Analysis and Case Studies

05.08.2008· voltage sag – usually only a few volts on 120-V system Noticeable at low levels – Saw Mills – Large Motors (Car Shredders, pumping systems) – HVAC systems Head-Saw Load Up – 9.6% Vdrop @ Mill Secondary and 6.6 % Vdrop On Primary Case #1

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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Typical motor speeds are either 4 or 6 pole, i.e. 1750 rpm or 1170 rpm for 60 Hz applications and 1450 rpm or 970 rpm for 50 Hz applications. The advantage of using a four pole motor allows for a smaller footprint and a smaller brake if required by the process. A six pole motor will be larger but will have a beneficial impact on thermal ratings of the gear reducer and noise. Based on overall

Get Price### Motor loads calculation - Electrical Engineering

Electrical motor loads are calculated from power in kW and full rated load in kW.Following is the formula how to calculate Motor loads. Example : We have 1 unit Induction Motor with 30 horsepower (hp),running with 34.9 amps for amperage load and 460 volts 3 phase and power factor value is 0.75 and motor efficiency is 85%

Get Price### Factors of Safety - Engineering ToolBox

Factors of Safety - FOS - are a part of engineering design and can for structural engineering typically be expressed as FOS = F fail / F allow (1). where . FOS = Factor of Safety. F fail = failure load (N, lb f) . F allow = allowable load (N, lb f) . Example - Structural Steel Column in a Building. Due to buckling the failure load of a steel column in a building is estimated to 10000 N.

Get Price### Sag and Tension Calculations - Refinements and

Sag-tension programs have traditionally calculated the conductor's sag-tension characteristics using the ALCOA graphic method. By refining the input used in this equation, and augmenting these results with other definable variables and selectable parameters, Trimble has created a more comprehensive tool for the design and operation of transmission lines. This paper discusses the

Get Price### AMIT 135: Lesson 5 Crushing – Mining Mill

Size is specified in terms of the gape and width, typically listed as gape x width. Largest jaw crusher is 1600 x 2514 mm with motor ratings of 250-300 kW. crushers (C200 series) are 1600 x 2514 mm with motors rated at 400 kW. The largest particle that can enter the opening of the jaw crusher can be estimated by: Largest particle size= 0

Get Price### TECHNICAL How to Spec a Mill Gear

mill to be processed, the typical mill speed is ~75% of the theoretical criti-cal speed of that mill. Using the above formulas, significant experience of how the grinding process works, and mate-rial properties of the ore being ground, the mill builder can provide the gear designer with input power and output speed.

Get Price### 29.8 2001 ASHRAE Fundamentals Handbook (SI)

Because of typically high no-load motor current, fixed losses, and other reasons, F LM is generally assumed to be unity, and no adjustment should be made for under- Radiation Factors, and Load Factors Appliance Usage Factor F U Radiation Factor F R Load Factor F L = F UF R Elec/Steam Griddle 0.16 0.45 0.07 Fryer 0.06 0.43 0.03

Get Price### 3 - PAPER - Michael Hamilton - FINAL

motor can be as much as 33% for synchronous motors with constant excitation and 21% for induction motors. It may be preferable in some instances to select a synchronous motor over an induction motor. Table I indicates typical ranges of motor reactances and inrush current per motor type.

Get Price### Factors Affecting Ball Mill Grinding Efficiency

The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency: a) Mill Geometry and Speed – Bond (1954) observed grinding efficiency to be a function of ball mill diameter, and established empirical relationships for recommended media size and mill speed that take this factor into account. As well, mills with different

Get Price### TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL

for the mill bearings, the mechanical mill brake control and the visualization of all parts of the drive system. Figure 1 shows a picture of a ringmotor used in copper concentrators. The poles of the rotor are directly mounted on the surface of the mill flange. Typically, the synchronous motors used in SAG mills have a power higher than 10 MW.

Get Price### Difference Between Sag Mill vs Ball Mill -

SAG mill make use of steel balls included with some large and hard rocks for grinding. These mills utilize the balls in making the large fragments of materials broken into pieces. The ball charge of a SAG mill is about 9% to 20%.This process takes place inside the large rotating drum of SAG mill which is filled with balls partially. Interior of the drum uses the lifting plates. These plates

Get Price### The power factor values for the most common

A high power factor allows efficient use of energy, while a low power factor indicates poor utilization of electrical power. Each equipment or load has its own power factor and depends on the resistive or inductive load, some typical or common values for buildings, appliances and motors are shown below.

Get Price### Belt Conveyors for Bulk Materials - Fifth Edition - Chapter 6

and seal resistance. A typical idler roll equipped with antifriction bearings and sup-porting a load of 1,000 lbs will require a turning force at the idler roll periphery of from 0.5 to 0.7 lbs to overcome the bearing friction. The milling or churning of the grease in the bearings and the bearing seals will require additional force. This force,

Get Price### 5 Most Common Motor Load Types - EEP

02.06.2019· Load profile (speed range, torque and power) Certain load types are characteristic in the industrial world. Knowing the load profile (speed range, torque and power) is essential when selecting a suitable motor and frequency converter for the application.

Get Price### Demand Factor-Diversity Factor-Utilization

Higher the load factor, lesser will be the cost per unit. Load Factor = Load that a piece of equipment actually draws / Load it could draw (full load). Example: Motor of 20 hp drives a constant 15 hp load whenever it is on. The motor load factor is then 15/20 = 75%. Load factor is term that does not appear on your utility bill, but does affect electricity costs. Load factor indicates how

Get Price### Gearless Mill Drives | Beneficiation | Global

Frozen charge detection and automatic loosening with gearless mill drives (SAG Conf. 2015) Mill drives: the desire for increased power and the associated limits and conditions (SAG Conf. 2015) The engineering and process effects of choosing a motor design speed (SAG Conf. 2015)

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