## CONTACT US

### Our Address

Science Avenue, High-tech Zone, Zhengzhou City, Henan Province, China

### Email Us

### Call Us

We Chat:
China-Liming-crusher

Tel:+86 139 3836 4618

## Advantages of SER drives for SAG mills GoHz

Dec 19, 2014 Advantages of the wound rotor/SER drive are: If the SER converter drive fails, the drive can be switched to fixed speed bypass - starting the usual way with the LRS. The converter only needs to be sized for 15-20% of the total motor rating with associated reduction in floor space, air-conditioning etc.

## SER DRIVE

SER Drive is backed up with a starter (LRS or RCD) which allows in case of any event to bumpless transfer to the LRS/RCD. In this way the SER Drive could be isolated, inspected and repaired without stopping the motor and then it could be transfer back. All this process does not requires stopping the motor, keeping the production running.

## Uneven SAG Mill Drive Power Draw - Grinding ...

A set of WRIM's running at 80% speed being controlled by an LRS is not the most energy efficient way to operate. Our last two 'large' drive SAG mills are both using WRIM's connected to SER drives. This solution seems to sit in between WRIM+LRS and SCIM+VSD as a cost effective drive solution.

## SAG Mill LRS Control Unearthed

SAG Mill LRS Control. The Problem Bottle Neck: Hard ore in circuit reducing throughput Major Issue No control of mill rotational speed due to old equipment and no capital expenditure Current System Control System - Mill control power to weight ratio Register for your free account. Login to continue reading ...

## SAG mills (semi-autogenous grinding mills) - Metso

SAG milling extends itself to many applications due to the range of mill sizes available. They 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 done by a ball mill. SAG mills are also an optimum solution for wet grinding since crushing and screening in these ...

## SAG Mill Process Control - Grinding Classification ...

If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to ...

## Starter of SAG Mills with rotor resistance

Sep 17, 2013 Advantages of the wound rotor/SER drive are: 1. If the SER converter drive fails, the drive can be switched to fixed speed bypass - starting the usual way with the LRS. 2. The converter only needs to be sized for 15-20% of the total motor rating with associated reduction in floor

## Difference Between Sag Mill vs Ball Mill - mech4study

Oct 12, 2017 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.

## SAG Mill Grinding Circuit Design

Semi Autogenous Design FactorsSag Mill Operation ExampleProcess Plant DescriptionSag Mill Design and SpecificationOperating Problems Since CommissioningDesign Changes and Future Operating StrategiesThe design of large mills has become increasingly more complicated as the size has increased and there is little doubt that without sophisticated design procedures such as the use of the Finite Element method the required factors of safety would make large mills prohibitively expensive.In the past the design of small mills, up to +/- 2,5 metres diameter, was carried out using empirical formulae with relatively large factors of safety. As the diameter and length of mills increased several crit...## STEPPING FORWARD: USING VARIABLE SPEED DRIVES FOR ...

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

## SAG Mill LRS Control Unearthed

SAG Mill LRS Control. The Problem Bottle Neck: Hard ore in circuit reducing throughput Major Issue No control of mill rotational speed due to old equipment and no capital expenditure Current System Control System - Mill control power to weight ratio Register for your free account. Login to continue reading ...

## How the Modern SER Drive boosts grinding performance - CSE ...

The Modern SER Drive is a compact, powerful, multi-functional and reliable addition to other SAG mill control technologies on the market today. The Modern SER’s lower-cost design, achieved through the reduced need for supporting plant – combined with its lower energy usage and exclusive design benefits results in lower ongoing costs ...

## SAG Mill Components - Mineral Processing Metallurgy

SAG Mill Components. Previous Next. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load and to give the required openings for feeding and discharging the mills. Mill heads are key structural ...

## advantage of sag mill - psasibaritide.it

sag mill advantages jackhiggins.co.za. SAG is an acronym for semiautogenous 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' in diameter, powered by a 28 MW (38,000 HP) motor. Read More

## SAG Mill - Official Feed The Beast Wiki

The SAG Mill is a machine added by Ender IO.It uses Micro Infinity (µI) to grind (or mill) items into their crushed variants, like Ores into Dusts.The SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs. Uniquely, the SAG Mill can use Grinding Balls made from various materials to increase energy efficiency (resulting in ...

## SAG Mill - Metso 22'x10.25' JDS Energy and Mining

Type: SAG Mill; Make: Metso; Model no.: 90012637; Condition: New; Year: 2013; Power: 2463 kW (3300 hp) Frequency: 60 Hz; Voltage: 4000V; Specifications. Effective Grinding 21’x9’ Mill Speed Design 75% of Critical; Motor Speed 1185 RPM; Gear box output 240 RPM; 12% Ball load by Vol. Full Package Includes. Inching drive

## ball mill jacking cradles - schoonwatervoormozambique.nl

sag mill jacking cradle. jacking cradle for ball mills radiusharbourheightsmazgaon Jacking Cradle For Ball Mills sag mill jacking cradle sag mill jacking cradle Request for Quotation You can get the price list and a GME representative will contact you within one business day [Get More] Chat Online Ball Mill Jacking Cradle In South Africa gaurgrandeurco.

## Milling - Energy intensive and high maintenance

• The WRIM + LRS system is causing high transient torques during the start-up. Figure 5. The WRIM + LRS is causing high transient torques during the start-up. Based on a study done by Anglo Technical Division, presented in a technical paper on the occasion of the SAG 2006 in Vancouver, B. C.

## SAG Milling in Australia -Revised Submission

MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill (11 MW) is currently the largest twin pinion single drive mill installed in Australia.

## Electrolytic starter (LRS) for high power slipring motors ...

Electrolytic starter (LRS) for slipring motors from 550 to 20,000 kW. EPM electrolytic starter can be used to start slipring motors from 500 kW to 20,000 kW. It will supply the power necessary to drive the motor by resistance variation. Smooth progressive acceleration; Wide range of applications; Rugged and reliable; Customised for each application

## Outotec awarded contract to supply Kansanshi copper-gold ...

Oct 10, 2008 So the Ball Mill at Frontier was yet again designed with robustness and performance in mind, but the trunnion-supported and high aspect 9.75m (32’) diameter SAG mill was the real technical force. The supply of this dual-pinion driven mill with 12MW of installed power included a Hypersynchronous Slip Energy Recovery Drive (Hyper-SER).

## New Used Sag Mills for Sale Semi-Autogenous Grinding ...

SAG is an acronym for Semi-Autogenous Grinding. SAG mills are essentially autogenous mills, but utilize grinding balls to aid in grinding like in a ball mill. A SAG mill is generally used as a primary or first stage grinding solution. Attrition between grinding balls and ore particles causes grinding of finer particles.

## Autogenous and Semi-Autogenous Mills

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.

## SAG Mill Abbreviation - All Acronyms

Mill SAG abbreviation meaning defined here. What does SAG stand for in Mill? Top SAG abbreviation related to Mill: Semi-Autogenous Grinding

## advantage of sag mill - psasibaritide.it

sag mill advantages jackhiggins.co.za. SAG is an acronym for semiautogenous 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' in diameter, powered by a 28 MW (38,000 HP) motor. Read More

## SAG Mill - Metso 22'x10.25' JDS Energy and Mining

Type: SAG Mill; Make: Metso; Model no.: 90012637; Condition: New; Year: 2013; Power: 2463 kW (3300 hp) Frequency: 60 Hz; Voltage: 4000V; Specifications. Effective Grinding 21’x9’ Mill Speed Design 75% of Critical; Motor Speed 1185 RPM; Gear box output 240 RPM; 12% Ball load by Vol. Full Package Includes. Inching drive

## New Used Sag Mills for Sale Semi-Autogenous Grinding ...

SAG is an acronym for Semi-Autogenous Grinding. SAG mills are essentially autogenous mills, but utilize grinding balls to aid in grinding like in a ball mill. A SAG mill is generally used as a primary or first stage grinding solution. Attrition between grinding balls and ore particles causes grinding of finer particles.

## liquid starter ball mill how does it work

The method of powering mills such as AG, SAG and Ball has a long and technically ... The key issue to operate a mill in a fix speed mode is the starting. ... operation. •. Liquid Resistor Starter (LRS) are containing agitated mechanical. Get Price

## SAG Mill - Feed The Beast Wiki

The SAG Mill is a block added by the EnderIO mod. A machine similar to a Pulverizer or a Macerator.It is used to process resources to produce dust. It accepts energy in the form of Redstone Flux or Minecraft Joule, with an internal buffer of 100,000 RF and consumption of 20 RF per tick.The energy storage capacity and processing speed can be increased by adding one of 3 tier of Capacitor into ...

## Outotec awarded contract to supply Kansanshi copper-gold ...

Oct 10, 2008 So the Ball Mill at Frontier was yet again designed with robustness and performance in mind, but the trunnion-supported and high aspect 9.75m (32’) diameter SAG mill was the real technical force. The supply of this dual-pinion driven mill with 12MW of installed power included a Hypersynchronous Slip Energy Recovery Drive (Hyper-SER).

## Autogenous and Semi-Autogenous Mills

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.

## SAG Milling in Australia -Revised Submission

MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill (11 MW) is currently the largest twin pinion single drive mill installed in Australia.

## ball mill jacking cradles - schoonwatervoormozambique.nl

sag mill jacking cradle. jacking cradle for ball mills radiusharbourheightsmazgaon Jacking Cradle For Ball Mills sag mill jacking cradle sag mill jacking cradle Request for Quotation You can get the price list and a GME representative will contact you within one business day [Get More] Chat Online Ball Mill Jacking Cradle In South Africa gaurgrandeurco.

## Milling - Energy intensive and high maintenance

• The WRIM + LRS system is causing high transient torques during the start-up. Figure 5. The WRIM + LRS is causing high transient torques during the start-up. Based on a study done by Anglo Technical Division, presented in a technical paper on the occasion of the SAG 2006 in Vancouver, B. C.

## Projects Undertaken New Concept Projects

The mill had been stored for a number of years and required refurbishment. NCP International managed the project as well as the mill conversion from 60Hz to 50Hz including replacement of the main drive motors supply of new pinions. The mill is dual drive mill and carries a communal LRS.

## Paper # 25 - Copper Mountain Overview on the Grinding ...

SAG mill rated motor speed 204 rpm, max. motor speed 214 rpm Ball mill rated motor speed 195 rpm, max. motor speed 209 rpm Starting torque: 150% for 15 s Main voltage level where the drive system is connected: 25 kV Excitation power is provided by a 4.16 kV bus As the power requirements for the SAG and ball mill drives are identical and the ...

## SAG Mill Control: It Shouldnt be that Hard

SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. The best way to measure load is to mount the mill on load cells. The load cells are calibrated to measure the total weight of water, grinding media (balls) and ore in the mill ...

## SINGLE STAGE SAG/AG MILLING DESIGN

SAG mill (4% ball charge, 90% Nc) A cross between AG and SAG for average competency, abrasive ores. Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground), Kloof, Jacobina 6 SAG mill with recycle crusher (8 – 15% ball charge) Competent ores, better suited to coarse grind sizes. High aspect mills are recommended to ...

## 1 x Metso SAG Mill Siemens Motor

1 x Metso SAG Mill Siemens Motor For Sale/Re-Assignment Mill Details Type of Mill Metso SAG Mill Mill Dimensions 11,582 mm x 7,759 mm (38’ x 26’) (D x L) Default Mill Speed 7.5-8.0 RPM Mill Speed 7.56-10.08 RPM Liners Excluded Mill Drive Motor Type Wrap Around (included) Mill Drive Motor Size 19,400 KW (26,016 hp) Variable Speed Drive Yes Max.

## Starter of SAG Mills with rotor resistance

Advantages of the wound rotor/SER drive are: 1. If the SER converter drive fails, the drive can be switched to fixed speed bypass - starting the usual way with the LRS. 2. The converter only needs to be sized for 15-20% of the total motor rating with associated reduction in floor space, air-conditioning etc.

## Coal Mill Motor With Rheostat - ACP Bryghia

Coal mill motor with rheostat ball mill waer parts and how to maintenance it grinding machine dukungan construction impact crusher with lowest price simbol part crusher. Live Chat; Ring Motor Sag Mill Samassociates. Of the frequency resolved current spectrum for a coal mill motor.Kd mill [09-11] need a rheostat for my ball mill 1 3.Typical sag ...

## Lrs Principle - Motor Starting - LMPForum

A very basic overview, but the advantage of wound rotor slip ring motor is that, through a LRS u can vary the resistance of the rotor. The advantages are 1. able to manipulate the torque speed curve, allowing u start with a much higher torque. Wound motors are suitable for application with heavy starting duties such as ball/sag mills, crushers etc.

## LOCKED CHARGE STARTS AND YOUR GRINDING MILL Jeff

SAG mill continually pump the finer material out of the mill, lowering ... (LRS) or Variable Frequency Drive (VFD), or it could be a clutch. Regardless ... Test and correctly set VFD or LRS – this prevents the mill starting too fast, causing the inertia to throw the ball charge. Set the clutches correctly - this ...

## suman kundu - AGM - vedanta aluminium and power ltd LinkedIn

- Taken on board to handle the operation, maintenance and trouble shooting of electrical equipments like SAG MILL BALL MILL motors( 5.5 MW and 3.5 MW) with LRS and SER, 11 KV panels, ACB,VCB, conveyor electrical system, relays, PMCC, MCC, Transformer, LT Motors, VFD Earthing Lighting etc.

## Gearless mill drives - Grinding ABB

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 design to provide highest throughput, reliability

## Ball Mill Liquid Rotor Starter - Gill Nagelstyliste en ...

Maquina Mill Motor Starter Lrs Pizzeriailgabbiano. Liquid rotor starter for ball mill alderbuebech liquid starter ball mill how does it work noa4lifenl liquid resistant starters on ball mill starter current ball mills cement liquid rotor starter for ball mill an ac motor is an electric motor driven by an alternating weg provides innovation in ball mill and sag.

## 3 - PAPER - Michael Hamilton - FINAL

Starting of the mill is possible by either using two of the 1250kVA sets or one 1250kVA and the 500kVA set. No theoretical analysis had been performed on the system, due to being an existing plant. Commissioning on site involved testing the LRS for the correct resistance to ensure the mill motor would develop ample torque to accelerate the mill.

## Electrodrives- ElectroDrives SL Ser. Drive Specialist

ElectroDrives is manufacturer of solutions for industrial applications of controls and power electronics in medium voltage (1kV-35kV). We are experts in Slip Energy Recovery Drives (SER Drives), Liquid Resistor Starters (LRS), Induction Motors, Reactive Power Compensation, Static Excitation Systems and Harmonics filters.Find out the solutions we provide to our customers for their SAG mills, AG ...

## Increasing availability through advanced Gearless Drive ...

Mill speed can be adapted to upstream and downstream processes – avoids overgrinding, and optimizes load distribution between SAG and ball mill (Mular, Halbe Barratt, 2002). Power consumption is influenced by load respectively torque and mill speed. This means that further energy can be saved if a mill speed below the rate speed is re-

## Mineral Processing Toshiba International Corporation ...

Application: Ball Mill Equipment: 1 x 44000kW 30 pole 6600 volt Synchronous Motor Location: Kalgoorlie, Western Australia Ernest Henry Mine Application: 1 x 11000kW SAG Mill driven by Dual 5500kW motors, 1 x 5500kW Ball Mill Equipment: 3 x 5500kW 6 pole 11000 volt Wound Rotor Induction Motors Location: Cloncurry, Queensland

## Matthew Youens Unearthed

Matthew Youens is a final year Electronics and Communications (Honours) Student Engineer at Edith Cowan University in Joondalup, Western Australia.

## Preprint 13-050

SAG mill conference, provided details of the then largest gear drive in operation on a SAG mill (34ft x 18ft) at Escondida 13.4MW, which began operation in 1995. The reason for not having larger gear drives was due to the limitation of gear manufacturers not having access to larger single piece special alloy castings. To the benefit of