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SAG Mill Optimization using Model Predictive Control ANDRITZ AUTOMATION Semi-Autogenous Grinding mills can be optimized for maximum ore throughput or maximum grinding energy efficiency SAG mill model predictive control MPC expert systems optimization Laguerre
Read moreAt the Lihir Gold Mine the concentrator plant was utilizing SAG mill's bearing pressure to calculate load measurement for their mill Following a series of SAG mill overload events that caused significant milling downtime the mill operators and metallurgists lost confidence in the repeatability and accuracy of the load measurements
Read moreVariable Speed Applications | 23 Cement Process overview Pumps A device that raises transfers delivers or compresses fluids or that attenuates gases especially by suction or pressure or both Benefits: l Increases output and performance of SAG mill – l l Cement
Read moreSAG Mill Optimization using Model Predictive Control ANDRITZ AUTOMATION Semi-Autogenous Grinding mills can be optimized for maximum ore throughput or maximum grinding energy efficiency SAG mill model predictive control MPC expert systems optimization Laguerre
Read moreA SAG mill is characterized by its large diameter and short length It rotates tumbling its contents violently causing a breaking action The mill is lined with wear resistant steel liners which are fitted with lifters to assist with raising the load The liners are replaced as
Read moreIt is situated near the Newmont Yanacocha gold mine where installed what was then the world's largest single-stage SAG mill a 32ft x 32ft (9 75m x 9 75m) EGL mill driven by a 16 5MW ABB gearless motor in 2008 That mill design was also the first of its kind and was customized for Newmont
Read moreVariable speed was required for the SAG mill Various options were considered to meet the specified speed range of 65 to 85% of mill critical speed and the final selection was the IES Hyper-Synchronous drive Slip Energy Recovery (SER) in conjunction with Wound Rotor Induction motors (WRIM)
Read moreWhen you hear the term inching drive you may think of a small actuator possibly piezo-driven suitable for short precise movements in applications such as optical inspection But inching drives are so named because of their ability to move very large high-inertia loads at very slow speeds
Read moreTherefore the SAG mill speed could not be controlled using the microphone based signal and instead was manually controlled/set by the control room operator Thus operation/speed of the mill could and would change significantly based on a particular operator running the mill and their overall level of mill operation experience and skill
Read moredone in a SAG/ball mill circuit with no coarse recycle classification of the SAG mill discharge The primary grinding mill is an 18 ft diameter x 9 ft EGL 1500 HP variable speed SAG mill and the secondary mill is a 13 ft diameter x 21 ft long 2000 HP fixed speed ball mill When
Read moreThe model assumes all SAG mills are variable-speed if a fixed-speed mill encounters this condition it will completely grind out and operators will probably be forced to stop the SAG mill Pick your mills sizes to avoid secondary mill limited conditions This transfer size is NOT a prediction
Read moreTherefore the SAG mill speed could not be controlled using the microphone based signal and instead was manually controlled/set by the control room operator Thus operation/speed of the mill could and would change significantly based on a particular operator running the mill and their overall level of mill operation experience and skill
Read moreVariable Speed Single or double pinion driving systems Designed to drive and control the speed of the medium voltage motors coupled to the SAG/AG ball and HPGR mills with single or double pinion the MVW01 frequency drive uses state of the art technology through a multilevel structure with medium voltage IGBTs reducing the harmonic currents on the motor to extremely low levels
Read more27 02 2008There are a number of reasons to select a variable speed drive for a SAG mill If you seek optimal performance over the life of lifters in the mill you need to modify mill speed as mill internal configuration wears Your objective should be: 1 Optimize grinding performance - mfgrs don't know best mill speed
Read moreIn this way all the available energy is used for grinding keeping ball breakage at a minimum and lowering the SAG mill steel consumption The figure 5 shows the effect of the SAG mill speed over the Impactmeter signal If the speed is low the impacts are low if the speed
Read moreAt the Lihir Gold Mine the concentrator plant was utilizing SAG mill's bearing pressure to calculate load measurement for their mill Following a series of SAG mill overload events that caused significant milling downtime the mill operators and metallurgists lost confidence in the repeatability and accuracy of the load measurements
Read moreA SAG mill is characterized by its large diameter and short length It rotates tumbling its contents violently causing a breaking action The mill is lined with wear resistant steel liners which are fitted with lifters to assist with raising the load The liners are replaced as
Read more2 d4 TM Mill Drivesystem 7 MW 7 MW 14 MW 28 MW 7 MW 4 MW 7 MW 7 MW 7 MW 4 MW 7 MW 7 MW SAG mill 32 ft single drive The natural progression in gear/pinion mill drives: The QdX4TM Mill Drive provides the next step in the evolution of change in mill drive architecture while allowing the system to be built with components that are within current manufacturing capabilities
Read moreVariable speed was required for the SAG mill Various options were considered to meet the specified speed range of 65 to 85% of mill critical speed and the final selection was the IES Hyper-Synchronous drive Slip Energy Recovery (SER) in conjunction with Wound Rotor Induction motors (WRIM)
Read moreMill 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-
Read moreMODEL PREDICTIVE CONTROL OF SAG MILLS AND FLOTATION CIRCUITS *Michael G Forbes and Bill Gough including variable ore properties complicated process dynamics interacting process variables (such as rotation speed and ore feed rate on SAG mill weight)
Read moreThe scope of supply includes three 7 4MW squirrel cage induction motors ACS6000 frequency converters with mill application controller and remote diagnostic facilities transformers medium voltage cubicles chiller units and system engineering for 3x30 foot diameter semiautogenous (SAG) mills ABB's variable-speed ring-geared mill drive (RMD
Read moreMill criteria SAG mill: 24 foot nom diam by 12 foot effective grinding length (EGL) ball mill: two 11 foot nom diam by 17 foot (assumed to be EGL) SAG mill single variable speed motor 4500 HP Ball mill single fixed speed motors 1000 HP (each mill) assume rubber liners in SAG
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