PRODUCTS

  • Literature Review: Gearless Motor Failures A Mill

    10-09-2014· 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.

    Cadia Girth Gear Failures eand.au

    22-09-2014· This is an update of work presented at the SAG 2001 conference on the Cadia gears [1]. Both gears and pinions on twin ball mills failed almost simultaneously. Our 2001 paper showed that the location of the failures is explained by the shape of the girth gear blanks. Fresko et. al. [2] shows that T-gears are in fact better than Y-gears in terms of

    Ball Mills and Sag Mill problem AMP Maintenance Forums

    21-11-2007· 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:

    What's the Difference Between SAG Mill and Ball Mill

    26-11-2019· Both the autogenous grinding mill and the ball mill feed parts are welded with groove and embedded inner wear-resistant lining plate. As the sag mill does not contain grinding medium, the abrasion and impact on the equipment are relatively small. The feed of the ball mill contains grinding balls.

    Case Study Grinding Mill Bearing Failure

    31-07-2013· The drive spindle has three (3) bearings: two (2) cylindrical roller bearings and one (1) ball bearing. The mill is being belt driven by a 100 hp, two-pole motor. The mill normally operates at 3,150 rpm. 1.Outboard Motor Bearing Legend 2.Inboard Motor Bearing 3.Inboard Mill Bearing* 4.Outboard Mill Bearing * Bearing that was failing.

    Uneven SAG Mill Drive Power Draw Grinding

    Ball load may be a cause too. Ball load can change because of feed rate change or wearing rate change. Ore property can also change hardness, clay content, etc. There are many paper talking about SAG mill optimization that can give you clue how the process data changes the power draw.

    Frozen charge detection and automatic loosening with

    Chile equipped with one 40ft SAG Mill of 22 MW and two 26ft Ball Mills of 16.4 MW commissioned in 2011. In the light of increasing interest in that technology various further Gearless Mill Drives with FCS are presently being erected or are in fabrication phase. Los Bronces suffered a Frozen Charge in their expansion plant Confluencia on 10th

    Case Study Grinding Mill Bearing Failure

    31-07-2013· The mill rotor bearings, which are mounted in a steel housing, are two (2) cylindrical roller bearings, NU 316 ECM/C3, and one (1) grooved ball bearing, SKF 6316 C3. The bearings have failed several times over a period of two (2) years. Before this time, the mill had no recorded bearing failures (as confirmed by the CMMS).

    TECHNICAL NOTES 8 GRINDING R. P. King

    LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. The no-load power accounts for all frictional and mechanical losses in the drive system of the mill and can be calculated from No load power 1.68 D 2.05 [3 c(0.667 Ld L)] steel balls in a ball mill, or large lumps of ore in an

    When it Comes to Mining, Bigger is Best

    Gearless mill drives may be the key to maintaining throughput Venkat Nadipuram (SAG) mill, ball mill, and crusher. A ball mill is a slightly inclined, horizon- Figure 2 Ball mill at Boliden Aitik copper mine. Figure 3 SABC flow sheet.

    Stepping forward: Using variable speed drives for

    Stepping forward: Using variable speed drives for optimising the grinding process in SAG and ball mills. ABSTRACT Comminution is usually the heaviest energy-consuming process in the mine site.

    Selecting Inching Drives for Mill and Kiln Applications

    auxiliary drive, is an important component of any mill or kiln installation. It is used for maintenance and inspection purposes, as well as an emergency auxiliary drive to keep kilns rotating when the main motor fails. This paper covers what data the end user needs to provide for proper selection of a drive as well as

    Grinding Mills an overview ScienceDirect Topics

    SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills’ discharge and pumped to two parallel packs (clusters) of

    Autogenous and Semi-Autogenous Mills FLSmidth

    Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.

    SmartMill Grinding ABB

    Combine ABB's variable-speed drive system with advanced process control ABB Ability™ Expert Optimizer for grinding to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ring-geared mill drives (RMD) or gearless mill drives (GMD).

    How Ball Mills Work (Engineering and Mining) YouTube

    20-06-2019· Learn how a ball mill works, all of its main parts and some of its design features! This 3D animated video allows you to see all the internal parts of a ball...

    Mechanical impacts analysis in SAG mills due to small

    This paper analyzes how electrical failures (related to high power gearless drives) affect the structural and mechanical behavior of the grinding process. Nowadays, high power multipulse cycloconvertes are widely used to feed big mills (SAG mills beyond 20MW).

    TECHNICAL NOTES 8 GRINDING R. P. King

    LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. The no-load power accounts for all frictional and mechanical losses in the drive system of the mill and can be calculated from No load power 1.68 D 2.05 [3 c(0.667 Ld L)] steel balls in a ball mill, or large lumps of ore in an

    Improved Relationships for Discharge in SAG/AG Mills

    (SAG) mills. In order to optimize this section, the skills to accurately model and understand its underlying mechanisms are required. The literature exposed a clear lack of previous research on the influence and performance of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from

    Selecting Inching Drives for Mill and Kiln Applications

    auxiliary drive, is an important component of any mill or kiln installation. It is used for maintenance and inspection purposes, as well as an emergency auxiliary drive to keep kilns rotating when the main motor fails. This paper covers what data the end user needs to provide for proper selection of a drive as well as

    When it Comes to Mining, Bigger is Best

    Gearless mill drives may be the key to maintaining throughput Venkat Nadipuram (SAG) mill, ball mill, and crusher. A ball mill is a slightly inclined, horizon- Figure 2 Ball mill at Boliden Aitik copper mine. Figure 3 SABC flow sheet.

    Grinding Mills an overview ScienceDirect Topics

    SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills’ discharge and pumped to two parallel packs (clusters) of

    Ball mill/SAG mill drive lubrication system IEEE

    Abstract: This paper describes the function and operation of lubrication systems for Ball Mill and SAG Mill Drives. Provided within this paper are hydraulic schematics, functional description and a general overview of system layout as well as some of the important features and factors relevant to improving the reliability of this very critical part of the grinding mill drive system.

    Stepping forward: Using variable speed drives for

    Stepping forward: Using variable speed drives for optimising the grinding process in SAG and ball mills. ABSTRACT Comminution is usually the heaviest energy-consuming process in the mine site.

    SmartMill Grinding ABB

    Combine ABB's variable-speed drive system with advanced process control ABB Ability™ Expert Optimizer for grinding to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ring-geared mill drives (RMD) or gearless mill drives (GMD).

    DuraFlex Coupling, V-Belt Drive Ball & Sag Mills

    Dura-Flex couplings connect the motor to the speed reducer on ball and sag mills. TB Wood's v-belt drives are heavily utilized in underground and processing applications including ball & sag mills, crushers, conveyors, cooling towers, winders and hoists.

    Mechanical impacts analysis in SAG mills due to small

    This paper analyzes how electrical failures (related to high power gearless drives) affect the structural and mechanical behavior of the grinding process. Nowadays, high power multipulse cycloconvertes are widely used to feed big mills (SAG mills beyond 20MW).

    Wear and Failure Analysis of Semi-Autogenous Grinding

    27-02-2017· Grinding is one of the most important and expensive steps of mineral processing. Therefore, different types of grinding mills such as rod mills, ball mills, semi-autogenous (SAG) mills and autogenous (AG) mills can be utilized for comminution of mineral ores [].Up to today, SAG mills and AG mills have been widely used to reduce operation costs and increase throughput.

    TECHNICAL NOTES 8 GRINDING R. P. King

    LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. The no-load power accounts for all frictional and mechanical losses in the drive system of the mill and can be calculated from No load power 1.68 D 2.05 [3 c(0.667 Ld L)] steel balls in a ball mill, or large lumps of ore in an

    Stepping forward: Using variable speed drives for

    Stepping forward: Using variable speed drives for optimising the grinding process in SAG and ball mills. ABSTRACT Comminution is usually the heaviest energy-consuming process in the mine site.

    UNICAST.CA Drives, Gears, Pinions, Bearings

    Ball Mill / SAG Mill Wear Parts Cast replacement wear parts with improved wear life. 250-807-7999 [email protected] UNICAST.CA Drives, Gears, Pinions, Bearings Unicast ball mill drive systems, including gears, pinions, and bearings. BALL MILL DRIVES, GEARS, PINIONS, AND BABBITTED BEARINGS Accurate and customized to fit. With in-field

    DuraFlex Coupling, V-Belt Drive Ball & Sag Mills

    Dura-Flex couplings connect the motor to the speed reducer on ball and sag mills. TB Wood's v-belt drives are heavily utilized in underground and processing applications including ball & sag mills, crushers, conveyors, cooling towers, winders and hoists.

    Mill Bolting

    The mill manufacturer specifies a load which is designed to be the optimum load applied to the bolts to hold the mill together for its entire life, which can be in excess of 20 years, some mill manufacturers specify an elongation, unfortunately they usually specify a torque figure which should in a best case produce the correct elongation, but rarely does.

    GRINDING MILLS BALL Mills, SAG Mills, AG Harcliff

    GRINDING MILLS BALL Mills, SAG Mills, AG Mills & ROD Mills. We refurbish, design and manufacture an extensive range of high-quality mills and mill components to exacting standards, offering you a turnkey service that’s backed by two decades of engineering expertise. BROCHURE. Finite Element Analysis (FEA) Ball Charge Trajectory Modelling

    Mill Lubrication System SlideShare

    13-01-2014· Mill Lubrication System 1. OBJECTIVES: To identify the definition and importance of a hydraulic lubrication system. To be familiarized with the lubricant and equipment used in the system. To understand the process and various design of Mill lubrication system. To identify some problems encountered by the system, and formulate some recommendation to help fix the problems.

    Ball mill Wikipedia

    A ball mill, a type of grinder, is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials and paints.Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Different materials are used as media, including ceramic balls, flint pebbles, and stainless steel balls.