# tpical charge lifting angle fopr sag mills

### TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS

SAG mills have a power higher than 10 MW. Even ball mills have a power larger than 10 MW. For this reason they have an important impact in energy consumption and in the operation of the power distribution system. Figure 1. Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor.

Get Price### Sag and Tension CalculationsRefinements and

designers with the information needed to assess the cost and performance of line designs. 3.1 Creep In addition to providing sag-tension information for the standard ten year creep Trimble s new program also can determine creep after any number of years of operation (refer to Graph 2). The

Get Price### The SAG grindability index testScienceDirect

Jan 01 2014 · The mill reportedly rotates at 70 of critical velocity (Verret et al. 2011) or 54 rpm (Gonzalez 2000).There is controversy surrounding the mill rotational speed. The calculation of mill critical velocity (V c) is derived from the balance of gravitational force and the centrifugal force acting on a ball and is given by Eq. after Austin and Concha (1994) (1) V c = 42.2 (D-d) where D is the

Get Price### Communition Handbook to prove highly useful for students

The three plates enable the lifting profile to be adapted to different operating parameters thereby optimising grinding efficiency. Liners are light plates weighing from 18-24 kg. They are used in mills from 3.0 to 5.4 m diameter. Reference. Royston D 2007. Semi-autogenous grinding (SAG) mill liner design and development.

Get Price### Predicting Liner Wear in a SAG Mill using Rocky DEM

As SAG and other types of mills are power hungry even a marginal reduction in power draw can translate to massive energy savings. Conventional approaches to achieve these goals are based on a combination of practical experience and trial-and-error studies that modulate design features and/or operating conditions.

Get Price### Semi-autogenous grinding (SAG) mill liner design and

the trend in large SAG mills has been to use wide-spaced shell lifters with large lifter face angles primarily to reduce packing and ball/liner damage and to use larger hence fewer mill liner parts to reduce downtime at liner change-outs. Key words Comminution Grinding SAG mill Mill liners Paper number MMP.

Get Price### Comparison of DEM and experiment for a scale model SAG

Jan 01 2003 · The experiments were conducted using a basalt ore with specific gravity of 2.84. The size distribution for the experimental charge is given in Table 1.The particle sets for the simulations were constructed using this specific gravity and this size distribution information assuming that particle diameters were uniformly distributed between the limits given for each of the size fractions.

Get Price### GrindingExpert™WordPress

just about SAG mills. Our GrindingExpert™ solutions include ball mill strategies that achieve the target grind size while maximizing throughput or when the circuit is SAG mill limited achieve the ﬁnest grind size possible thus increasing mineral liberation and recovery. GrindingExpert™ has been shown to typically increase throughput by

Get Price### The influence of mill speed and pulp density on the

Graph 5. Pulp charge and ball charge angles 205 200 195 190 185 180 175 170 165 media angle pulp angle 68 70 72 74 76 78 solids Angle The pulp volume on the other hand increases linearly with the pulp solids. Conclusions The influence of mill speed

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cost AU 000 and more depending on special lifting requirements. Items in a tool container could include temporary power generator customised lifting equipment computerised laser alignment equipment a hydraulic torque multiplier (for the large critical fasteners) and temporary oil lube

Get Price### AN UPDATED DATA SET FOR SAG MILL POWER MODEL

White (1904) and Davis (1919) and assumes that the surface of the charge of the mill that is in contact with the mill shell can be approximated as a chord of a circle connecting a charge "shoulder" to a charge "toe". This charge geometry is calculated by the mill charge level and a manually-input angle that

Get Price### AMIT 135 Lesson 7 Ball Mills CircuitsMining Mill

For overflow ball mills the charge should not exceed 45 of the mill volume . For grate discharge mills the charge should occupy about 50 of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge He and the radius of the mill R i.e.

Get Price### typical lift in trunnion bearings of sag mills

TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS . Sag mills have a power higher than mw even ball mills have a power larger than mw for this reason they have an important impact in energy consumption and in the operation of the power distribution system figure picture of a typical gmd system for a sag mill figure presents the power circuit of a cycloconverter fed synchronous motor

Get Price### Pontificia Universidad ólica de Chile

The Net Power Demand of a SAG mill may be well estimated by the simple Hogg and Fuerstenau Model ("Power Relations for Tumbling Mills" Trans. SME-AIME Vol. 252 pp. 1972) here expanded from its original formulation to represent the independent contribution of each component of the mill charge (balls rocks and slurry) to the

Get Price### UTILITY LINE DESIGN CALCULATIONS

Utility Line Design has over twenty-five planned calculations that will be added to the website at no added charge in the coming months. Standards and Design Criteria. SURVEYING Measuring Angles by Tape Measure Method Measuring Small Angles from Adjacent Pole by Tape Measure Method Deflection Angle from Two Traverse Bearings

Get Price### CMP Paper 16.10.09 Final

Number of mills Power MW 4 Figure 1 Typical mechanical mill configurations The central driven mill solution is found on the lower power range of the mills due to the high torque that has to be transmitted to the mill through the torque tube at the charge or discharge side of the mill.

Get Price### Mineral movement simulation through the grates and pulp

Nowadays SAG mills are the machines that are most frequently found in operation in concentrating plants. Their large sizes allow processing large volumes of materials with flows of the order of 5000 tph. These kinds of equipment have the function of reducing the size of the material to a maximum of 75 mm.

Get Price### GrindingExpert™WordPress

just about SAG mills. Our GrindingExpert™ solutions include ball mill strategies that achieve the target grind size while maximizing throughput or when the circuit is SAG mill limited achieve the ﬁnest grind size possible thus increasing mineral liberation and recovery. GrindingExpert™ has been shown to typically increase throughput by

Get Price### Optimization of the design of AG Mill shell liners at the

1 Optimization of the design of AG Mill shell liners at the Gol-E-Gohar concentration plant M. Maleki-Moghaddam1 M. Yahyaei 2 A. Haji-Zadeh 3 H. Asadi 4 and S. Banisi 5 1- University of

Get Price### Pontificia Universidad ólica de Chile

Represents the so-called Dynamic Angle of Repose (or Lift Angle) adopted during steady operation by the top surface of the mill charge ("the kidney") with respect to the horizontal. A reasonable default value for this angle is 40° but may be easily "tuned" to specific applications against any

Get Price### TECHNICAL NOTES 8 GRINDING R. P. King

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### TECHNICAL NOTES 8 GRINDING R. P. King

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### The influence of mill speed and pulp density on the

Graph 5. Pulp charge and ball charge angles 205 200 195 190 185 180 175 170 165 media angle pulp angle 68 70 72 74 76 78 solids Angle The pulp volume on the other hand increases linearly with the pulp solids. Conclusions The influence of mill speed

Get Price### Editor Laura White laura.whiteoutotec 1 OUTOTEC

cost AU 000 and more depending on special lifting requirements. Items in a tool container could include temporary power generator customised lifting equipment computerised laser alignment equipment a hydraulic torque multiplier (for the large critical fasteners) and temporary oil lube

Get Price### MODULE 4LIFTING AND RIGGING

n Describe the proper use of swivel hoist steel angle brackets and concrete screws. n Understand the proper use of wire ropes wire rope fittings end terminations and tighteners. n Explain the use of slings and sling arrangements. n Describe the use of chains for rigging and lifting.

Get Price### GUIDE FOR INSTALLATION OF ACSS ACSS/TW CONDUCTOR

typical sizing criteria are discussed below. A minimum bottom groove diameter of 20 times the conductor diameter is recommended although higher tension pulls or structures with a turning angle greater than 20° may warrant larger sheaves. For angles between 20-45° a bottom groove diameter of 25 times the

Get Price### UTILITY LINE DESIGN CALCULATIONS

Utility Line Design has over twenty-five planned calculations that will be added to the website at no added charge in the coming months. Standards and Design Criteria. SURVEYING Measuring Angles by Tape Measure Method Measuring Small Angles from Adjacent Pole by Tape Measure Method Deflection Angle from Two Traverse Bearings

Get Price### Mineral movement simulation through the grates and pulp

Nowadays SAG mills are the machines that are most frequently found in operation in concentrating plants. Their large sizes allow processing large volumes of materials with flows of the order of 5000 tph. These kinds of equipment have the function of reducing the size of the material to a maximum of 75 mm.

Get Price### MODULE 4LIFTING AND RIGGING

n Describe the proper use of swivel hoist steel angle brackets and concrete screws. n Understand the proper use of wire ropes wire rope fittings end terminations and tighteners. n Explain the use of slings and sling arrangements. n Describe the use of chains for rigging and lifting.

Get Price### TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS

SAG mills have a power higher than 10 MW. Even ball mills have a power larger than 10 MW. For this reason they have an important impact in energy consumption and in the operation of the power distribution system. Figure 1. Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor.

Get Price### Comparison of DEM and experiment for a scale model SAG

Jan 01 2003 · The experiments were conducted using a basalt ore with specific gravity of 2.84. The size distribution for the experimental charge is given in Table 1.The particle sets for the simulations were constructed using this specific gravity and this size distribution information assuming that particle diameters were uniformly distributed between the limits given for each of the size fractions.

Get Price### Communition Handbook to prove highly useful for students

The three plates enable the lifting profile to be adapted to different operating parameters thereby optimising grinding efficiency. Liners are light plates weighing from 18-24 kg. They are used in mills from 3.0 to 5.4 m diameter. Reference. Royston D 2007. Semi-autogenous grinding (SAG) mill liner design and development.

Get Price### Types of Mills

A SAG mill is generally used as a primary or first stage grinding solution. 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. A SAG mill with a 44 diameter and a power of 35 MW (47 000 HP) has been designed.

Get Price### TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS

SAG mills have a power higher than 10 MW. Even ball mills have a power larger than 10 MW. For this reason they have an important impact in energy consumption and in the operation of the power distribution system. Figure 1. Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor.

Get Price### MODULE 4LIFTING AND RIGGING

n Describe the proper use of swivel hoist steel angle brackets and concrete screws. n Understand the proper use of wire ropes wire rope fittings end terminations and tighteners. n Explain the use of slings and sling arrangements. n Describe the use of chains for rigging and lifting.

Get Price### Development of a method to measure charges in tumbling mills

Morrell (1994) demonstrated that Equation 1 presents errors when measuring charge levels below 20 a common situation in SAG mills. In addiction to that many times there are practical limitations for measuring the heights of large diameter mills.

Get Price### The influence of mill speed and pulp density on the

Graph 5. Pulp charge and ball charge angles 205 200 195 190 185 180 175 170 165 media angle pulp angle 68 70 72 74 76 78 solids Angle The pulp volume on the other hand increases linearly with the pulp solids. Conclusions The influence of mill speed

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