### Ball Mills and Sag Mill problem | AMP Maintenance Forums

Nov 21, 2007· We have two Ball Mills and one Sag Mill. We had some visual inspection on pinion and ring gears, during these inspections we found some abnormal wear on this gears (pictures show this problem in enclosure). After that we decided to do some tests as vibration and oil analysis. Result of the vibration and oil analysis tests are as a below:

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

Nov 26, 2019· 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 the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill’s ...

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### ball mills and sag mill problem - pokazywanieniewidzialnego.pl

SAG Mill vs Ball Mill As the diameter and length of mills increased several critical problem areas were identified One of the most important was the severe stressing which took place at the connection of the millAttrition mill is a type of grinding mill by kinds of media to crush lump to powderlike substances The impact can be rock on rock such ...

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### Difference Between Sag Mill vs Ball Mill - mech4study

Oct 12, 2017· 1. SAG mill is the primary tool for grinding. SAG mill is used before the other mills. Ball mill is a secondary, and it is used after the SAG mill. 2. SAG mill breaks the raw material into pieces for the further grinding. Ball mill is used to grind the pieces of raw material into. powder-like structures. 3.

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### sag mill ball charge calculation - khimarbiru.com

2017-5-13 · optimization of the SABC comminution circuit, focusing on the primary (SAG mill) and secondary (ball mill) grinding mills, and estimating the outcomes of changes to circuit operating parameters (e.g., feed rate, mill load, ball charge, etc.). 2. Problem Validation and Analysis

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### ball mills and sag mill problem - pokazywanieniewidzialnego.pl

SAG Mill vs Ball Mill As the diameter and length of mills increased several critical problem areas were identified One of the most important was the severe stressing which took place at the connection of the millAttrition mill is a type of grinding mill by kinds of media to crush lump to powderlike substances The impact can be rock on rock such ...

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### Solito, Inc. | Sag Mills

Sag Mill Problem: Far too frequent lube oil filter changes were eating into the mill’s productivity due to far too frequent oil and filter changes. Eleven unscheduled changes each year were causing complete shut downs. Solution: $247,500 of lost production was returned to operations.

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### sag mill ball charge calculation - khimarbiru.com

2017-5-13 · optimization of the SABC comminution circuit, focusing on the primary (SAG mill) and secondary (ball mill) grinding mills, and estimating the outcomes of changes to circuit operating parameters (e.g., feed rate, mill load, ball charge, etc.). 2. Problem Validation and Analysis

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### What’s the Difference Between Ball Mill, Rod Mill and SAG ...

Mar 20, 2020· Ball mill： Ball mills are the most widely used one. Rod mill： The rod mill has the highest efficiency when the feed size is <30mm and the discharge size is about 3mm with uniform particle size and light overcrushing phenomenon. SAG mill: When the weight of the SAG mill is more than 75%, the output is high and the energy consumption is low ...

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### SAG Mill Grinding Circuit Design - 911metallurgist.com

Jun 06, 2016· This refers to high-aspect AG/SAG mills. Ball Charge Motion inside a SAG Mill. With a higher density mill charge. SAG mills have a higher installed power density for a given plant footprint relative to AC mills. With the combination of finer grind and a lower installed power density (based on the lower density of the mill charge), a typical AG ...

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### AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...

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. Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill circuit. A diagram of types of AG/SAG ...

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

The standard method for sizing secondary ball mills (usually the overflow type) in AG/SAG circuits follows published mill supplier information with aspect ratios in the range 1:1.5 to 1:2.0, depending upon product sizing and pulp flow, i.e., the highest expected circulating loads (Morrell, 2001). The applied net power, calculated from testwork

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### SAG Mills and Ball Mills - YouTube

Dec 21, 2016· 2 parallel SAG Mills each feeding 2 parallel Ball Mills (4 total). Around 50,000 TPD total grinding circuit capacity.

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### Ball Mills Losing High & Low Lube pressure - Grinding ...

One of our Ball Mills keeps losing pressure on the high pressure pump. It will run fine when starting the Mill and suddenly after a while sometimes 1hrs the pumps will loose pressure. We have just grinded the journal and installed new white metal bearings. After startup this afternoon after about 1hrs the pumps low and high just lost pressure.

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### sag mill pinion vibration problems - farmaciacabanillas.es

sag mill vibrating screens - centurionhandymancoza. sag mill pinion vibration problems , Home >Project Case >sag mill pinion vibration problems , Ball Mills and Sag Mill , …

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### SAG & BALL Mill Maintenance – KIE SARL

SAG Mill make use of steels balls included with some large hard rocks for grinding. These mill utilize the balls in making the large fragments of materials broken into pieces and ball mills are used primary for single stage fine grinding, regrinding, and as the second state in two stage grinding circuits.

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### expression of critical spped of a ball mill

Derivation Of The Expression For Critical Speed Of A Ball Mill. derive expression for critical speed of ball mill derive expression for critical speed of ball mill Ball Mill Critical Speed Mineral Processing Metallurgy A Ball Mill Critical Speed actually ball rod AG or SAG is the speed at which the centrifugal forces equal gravitational forces at the mill shells View All

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### Literature Review: Gearless Motor Failures – A Mill ...

Sep 10, 2014· The Collahuasi motor was for a 40 ft SAG mill. The Antamina 38 ft SAG mill was also driven by an ABB motor and the hanger plates had not failed on that machine after several years of operation. Similarly, the Sossego motor for the 38 ft SAG mill had not failed. It too had an ABB motor and it had operated longer than the Collahuasi motor.

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### How grinding mill design changed over the last 30 years ...

Jun 03, 2020· Note that ball mills are heavier than SAG mills, therefore, it may be misleading to think that large SAG mill designs lead the way. Reference: Autogenous and Semiautogenous Mills, 2015 Update by F. Tozlu, M. Fresko, 2015 SAG Conference, Vancouver, British Columbia, September 2015; and other OEM installation lists.

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### ball mills and sag mill problem - pokazywanieniewidzialnego.pl

SAG Mill vs Ball Mill As the diameter and length of mills increased several critical problem areas were identified One of the most important was the severe stressing which took place at the connection of the millAttrition mill is a type of grinding mill by kinds of media to crush lump to powderlike substances The impact can be rock on rock such ...

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### What is the difference between a SAG mill and ball mill?

A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44′ (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. [9]

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### Fluid mechanics of slurry flow through the grinding media ...

Dec 31, 1995· Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size.

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### sag mill ball charge calculation - khimarbiru.com

2017-5-13 · optimization of the SABC comminution circuit, focusing on the primary (SAG mill) and secondary (ball mill) grinding mills, and estimating the outcomes of changes to circuit operating parameters (e.g., feed rate, mill load, ball charge, etc.). 2. Problem Validation and Analysis

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### Mill Sag Mechanical Failure - greenrevolution.org.in

Following the SAG mill will be two 9,000-hp ball mills, each one 20-ft in diam. and 331/2-ft long, that do the finish grinding.How to analyze gear failures. EDM speeds cutting of precision gears. Right-angle gear drives - Zero-Max Inc.The Essentials of Mechanical Systems.

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### Ball Mill Quartz Grinding Technical Problem

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. Get Price; Ball Mill Quartz Grinding. Ball Mill Quartz Grinding Technical Problem. Ball Mill For Quartz Grinding Crusher Mills, Cone Crusher , Ball Mill used for quartz mining for sale in India,ball mill , Ball mill is an ...

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### Autogenous and Semi-Autogenous Mills - ScienceDirect

Jan 01, 2016· The SAG mill had a 6–8% ball charge and the power consumption was 8 kWh/t, which agreed well with the expected value. 9.6. Problems. 9.1. In an SAG mill the dimensions of the mill were 9.75 m × 3.5 m and the specific gravities of the mineral and …

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### How grinding mill design changed over the last 30 years ...

Jun 03, 2020· Note that ball mills are heavier than SAG mills, therefore, it may be misleading to think that large SAG mill designs lead the way. Reference: Autogenous and Semiautogenous Mills, 2015 Update by F. Tozlu, M. Fresko, 2015 SAG Conference, Vancouver, British Columbia, September 2015; and other OEM installation lists.

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### expression of critical spped of a ball mill

Derivation Of The Expression For Critical Speed Of A Ball Mill. derive expression for critical speed of ball mill derive expression for critical speed of ball mill Ball Mill Critical Speed Mineral Processing Metallurgy A Ball Mill Critical Speed actually ball rod AG or SAG is the speed at which the centrifugal forces equal gravitational forces at the mill shells View All

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### ABB’s new Gearless Mill Drive generation: Maintenance ...

Ball Mill SAG Mill Figure 2 Core pressing system with spring plate/washer and re-tightening statistics in a typical installation Access to the inside of the motor and the cooling system The easier the access to the inside of the motor is, the more convenient and efficient is the work on the motor.

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### Ball Mill - an overview | ScienceDirect Topics

The ball mill accepts the SAG or AG mill product. Ball mills give a controlled final grind and produce flotation feed of a uniform size. Ball mills tumble iron or steel balls with the ore. The balls are initially 5–10 cm diameter but gradually wear away as grinding of the ore proceeds. The feed to ball mills (dry basis) is typically 75 vol ...

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### SAG Milling in Australia -Revised Submission

Pasminco Century SAG-Ball 10.97*5.41 12 ... It has been the industry standard for SAG mills above 13 MW capacity. However, ... (11 MW) is currently the largest twin pinion single drive mill installed in Australia. Problems have been experienced with the twin pinion drive at Fimiston and with the ring motor at Cadia. At Cadia, excessive ...

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### ball mill and sag mill - mentalsportsacademy.pl

What is the difference between a SAG mill and ball mill? 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 ...

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### Dimensionality in ball mill dynamics | SpringerLink

May 01, 1991· 1) Overload in overflow ball mills is due to the approach to a critical axial flow velocity for pulp of 0.072 m/s. 2) While so far important only with 5.0 and 5.5 m diameter mills, it should be found with smaller mills in combinations of very high circulating loads, excessive L/D ratios, very soft ores or coarse grinds. 3. A proper balancing of lower Lf and higher F values can reduce the risk ...

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