AG mills (or SAG mills with low ball charges) are often used in single-stage grinding applications. Based on their higher throughput and coarser grind relative to AG mills, it is more common for SAG mills to he used as the primary stage of grinding, followed by a second stage of milling. AG/SAG circuits producing a fine grind …
The Impactmeter is an advanced SAG mill performance monitoring instrument developed to measure load generated impacts and provide mill liner protection through the use of …
mill dual motor sag mills dentystasosnowieceuball mill drive motor choices amroninternationalin. dual pinion sag mill x lss motor airclutch load sharing system amp concentration large mv motors and drives grinding mills sag mill dual pinion geared drive sag mill ball mill ring gear dual pinion drive systems variable speed each ball mill is …
A SAG mill, or semi-autogenous grinding mill, is a type of machine used in mining and mineral processing operations. It uses the crushing and grinding action of rocks to reduce materials such as copper ore into smaller pieces for further processing. Unlike traditional mills that rely on steel balls or other media to break down materials, SAG ...
This gap becomes wider with increased pole pair construction and lower base speeds. Synchronous motors ope rate with higher efficiency, lower curre nts due to high P F and have usa ble low speed ...
SAG mill drives. There are two types of SAG mill drives. Power is transmitted to the grind-ing mill either through a pinion and ring.
The breakage rate function shape of the SAG mill is largely governed by the mill load particle size distribution and mill speed. The feed in the mill contains fractions of ore that serves as the grinding media. Larger ore fractions break the smaller particles but also breakdown themselves and exit the mill as a product.
This puts the application in the realm of dual motor, dual pinion installations. xPower demand of 16 – 28 MW. ... The SAG mill model in the JKSimMet software has not been shown to accurately reproduce the performance of a single stage mill for greenfield design. A review of most modern power models shows that the prediction of
Smooth, stepless start-up of slip ring motors. Adjustable starting times. Triangular alignment of electrodes for balanced current density. Protection class: IP 55. Global commissioning and service structure. Bushings above water level. Scalable for dual pinion drives. Typical applications of the GINO-AKA starters: Ball Mills.
SAG mill single drive. MW. The new high-powered mechanical solution. The QdX4TM Mill Drive was developed in close collaboration with both CMD and Ferry …
dual pinion gear driven mill; a Drive 5 - A 5000 HP, 1200 rpm synchronous - induction motor with liquid rheostat and dc field excitation to a dual pinion gear driven mill. For the power supply in this study, four different scenarios will be considered as a power system in order to evaluate the different drive systems.
Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust, service-friendly and fit for purpose ...
Induction motors For ball and SAG/AG mills with single or dual pinion configuration, Slip Ring Motors drive the gearboxes and are normally used when fixed speed and low starting current are required. WEG Induction Motors (Master Line) are designed with air cooling system (totally enclosed air-air cooling) or water
Mill application features. Frozen charge protection – Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Stand-still detection – Prevents the motors from re-starting if the mill is still …
Figure 2.6 Typical motor-starting voltage sag . Autotransformer starters have two autotransformers connected in open delta. Taps provide a motor voltage of 80,65, or 50percent of system voltage during start-up. ... Part-winding starters are attractive for use with dual-rated motors (220/440 V or . 230/460 V). The stator of a dual-rated motor ...
SAG mill and two 26 ft ball mills, all made by . The drive systems that enable the mills to operate at benchmark levels of reliability, efficiency and availability were made by ABB, whose solution comprises a 23.5 MW gearless mill drive (GMD) for the SAG mill, and two 13 MW low-speed dual-pinion ring-geared mill drive (RMD) systems for the ...
Variable Speed Drives. Variable speed drives are not new. Many have been used in the cement industry on mills drawing up to 6,525 kW (8,750 hp). There are 39 gearless drive installations worldwide, but …
22 ft x 7 ft (7 x 2 m) Hardinge SAG Mills, - Motor Quoted separately, - Previously ran on two 800 HP motors, - Dual Flender gearboxes, - Shell reconditioned. View ... (13,410 HP) fixed speed dual motor-gearbox-pinion drive. Designed as an overflow ball mill with rubber liners. Includes lube systems, feed chute, jack cradles, currently less ...
dual pinion sag mills – Gold Ore Crusher. 22' x 36.5' Our Company ball mills, (2) dual pinion synch 4650 KW mtrs. CONSTRUCTION & MINING EQUIPMENT BALL, PEBBLE, SAG MILLS, MINING 22' x 36.5' Our Company ball ….
SAG mill 36 ft. dual drive SAG mill 40 ft. QdX4TM Mill Drive Foundation deformation CMD test bench Condition monitoring. d4 TM Mill Drive system3 Foundation ... • Dual motor load sharing between two TM QdX4 Mill Drives. • Low speed synchronous or induction. Motor with Variable Speed Drive (VSD)
Advanced Process Control Systems. With systems, there is an assumption that any issues in the plant's control system will be resolved once the system is installed. However, if the in-place base layer control is operating poorly, the system is not effective at maintaining the operational targets. Any variability created from the base ...
The Copper Mountain SAG mill is 10363 mm [34 feet] in diameter and 6096 mm [20 feet] long. It is a grate discharge mill with an inside diameter of 10363 mm [34 feet] and a grinding length of 5334 mm [17.5 feet]. The mill is driven by two 8,500 horsepower ABB motors. Figure 2 - The 34' x 20' SAG mill. 4.
The second step to decreasing high wear rates was to reduce the maximum operating speed on the SAG mill from 13.2 RPM (78% of critical speed) to 12.7 RPM (75% of critical speed). Justifications were made for the installation of an Omnicone crusher on the SAG pebble oversize material. Conservative estimates were made that as little as a …
drive application is a dual-pinion SAG mill driven by two 5,000 kW wound rotor induction motors (WRIM). Two TMdrive-10SPRs control motor speed by recovering rotor current and returning the power to the utility supply. Confi gured in a twin motor arrangement, the motors share load in the tandem mill. The Customer Need
Secondary Mills. 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 …
SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent …
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TMEIC designs and manufactures two types of AC solutions for this purpose. Salient pole synchronous motors that meet the high power and torque demands of a hot strip mill, as well as roughing and finishing stands. Squirrel cage rotor motor applied to medium power requirements of reels and stands. Meets NEMA MG1 and JEM 1157 standards.
Figure 1 – Top view of SAG mills with alternative drive options; left side: dual pinion drive including motor, gearbox, pinion and girth gear; right side: gearless ring motor: Declining ore grades, leading to increased material transport and …
Understand the key process drivers affecting the SAG mill performance by assessing the SAG mill performance using comminution models. The objective is to identify the key …
Table 1 includes the technical data for the Copper Mountain SAG mill. Table 1 - general SAG mill data Specification Data Mill size 10.363 M [34 feet] diameter by 6.096 M [20 feet] long Mill type Wet grinding, grate discharge Mill drive motor size 17,000 HP Mill drive motor type Synchronous 200 RPM Inside diameter 10,363 mm Length 6,096 mm
Product Size: All passing 6 mesh with 80% passing 20 mesh. Net power from pilot plant: 16.5 KWH/ST. Mill, gear and pinion friction multiplier: 1.025. Mill Power required at pinionshaft = (240 x 16.5 x 1.025) ÷ 0.746 = 5440 Hp. Speed reducer efficiency: 98%. 5440 Hp ÷ 0.98 = 5550 HP (required minimum motor output power).
