xstrata zinc sag mill power load control

as the mill rotates, providing a combined crushing and grinding effect on the ore. One of the main reasons for the use of SAG mills is the elimination of the secondary and tertiary crusher stages, and the substantial reduc-tion in consumed power over conventional milling. A typical SAG mill with a smaller conventional ball mill shown in the

Is it advisable to use a SAG mill for small, say 2000 TPD concentrator operations? The processing, in this case, is a complex zinc/tin mineral and we are afraid a SAG would P80 produces too much fines (since the tin is to soft brittles) (tin …

Xstrata Zinc: SAG Mill Power / Load Control - Mipac. Model-based control technology to account for long process dead tim Loop-tuning and commissioning skills Results The result is a stable robust control strategy which has the confidence of the operating staff By allowing the SAG mill to be operated safely at higher power draws the feed rate has increased by 15 tonnes per …

Average Std Dev. Minimum Maximum SAG Feed SAG Load mpth kPa 131.3 4 454 9.7 24 100.5 4 392 152.7 4 503 42 Figure 7 SAG `Basic' Feed Rate Control (Early) (McKee, 1999). "In grinding, control of AG/SAG mill circuits is the dominant area.

throughputs for given mill sizes and motor power combinations. Review of mill and motor specifications and bids. Antamina, "Interested Underwriters" c/o Crawford & Company (SA)(Pty)Ltd., Johannesburg, R.S.A. (2008) An Opinion on tripping of the SAG Mill and its Motor during 2007 and 2008.

1. If the SAG mill is too small, capital revisions will be required. Either pre-crushing, pebble crushing or both may be required. Operating costs will also be higher due to higher steel load required and/or higher mill speed which can be …

Xstrata's Nth Qld Operations Ernest Henry is a modern open-cut ... SAG mill, ball mill, floatation cells (rougher and 3-stage cleaning process), as well as a pressure filter. ... improvement in the identification and control of hazards and overall safety improvement.

The power requirement differs between grinding mills and conveyors. The power needed for the conveyor is much smaller. "A SAG mill requires 30 MW and these types of converters are water-cooled," Dirscherl said. "These conveyors require a maximum of 6 to 8 MW and we can use an air-cooled system for the cycloconverter.

Benchmarking: SAG Mill Power Draw, Valle, R and Nozawa, E, Yanacocha Gold Single Stage SAG Mill Design, Operation, and Optimization,, FAG Mill. ... load and power. ... Evolution of SAG Mill Process Control at the Xstrata. Evolution of SAG Mill Process Control at the Xstrata Nickel Raglan Operation, an Optimization Project (FAG to SAG ...

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 …

By allowing the SAG mill to be operated safely at higher power draws the feed rate has increased by 15 tph. Assuming a Zn price of $3,300 (AUD) per metric tonne and a head grade of 6%, this equates to $70,000 (AUD) of extra metal entering the concentrator over 24 hours. SAG Mill Power / Load Control Customer Glencore - Mount Isa Mines, Zinc

Xstrata will provide the IsaMill™ as a packaged Grinding Plant, consisting of the mill, slurry feed and discharge systems, media handling system, all instrumentation and control and all structural steel and platforms. Some of the IsaMill™ Grinding Plant components are shown in Figure 3 and 4. The

GRINDING - CIRCULATING lOAD PROCESS CONTROL - View presentation slides online. Scribd is the world's largest social reading and publishing site. Open navigation menu

This quantity is small compared to the power used by a semi-autogenous mill and a ball mill in a primary grinding circuit; a ball mill can have an installed power of up to 15 MW, while installed power for a SAG mill can go up …

Power (kW) Figure 3. Vertimill® VTM 1500 power draw increase with media load Data from the Vertimill® grinding media loading operation were collected to study the mill power response with load. Figure 3 shows the mill power as a function of media load in water. It can be seen that the power equation accurately fits the mill power trend.

461 PAPER 28 Design and Implementation of Advanced Automatic Control Strategy Based on Dynamic Models for High Capacity SAG Mill Ivan Yutronic N.1, Metallurgical Engineer, Process Engineer Rodrigo ...

Effective SAG mill control will maximise throughput, minimise damage to mill internals (liners and lifters) and contribute significantly to achieving maximum recovery in flotation. Well designed and implemented SAG control will payback in weeks not years. SAG mill control is essentially the stabilisation of mill load (and/or power) and density

ABB, one of the leading power and automation technology groups, recently won an $11 million order to supply a complete ore hoisting solution for Xstrata Copper's Ernest Henry Mining (EHM) copper-gold operation in north …

445 PAPER 28 Evolution of SAG Mill Process Control at the Xstrata Nickel Raglan Operation Erik Bartsch1, Chief Engineer Guy Comeau2, Senior Metallurgist Colin Hardie3, Former Chief Metallurgist 1 Process Control Group, Xstrata Process Support 6 Edison Rd, Falconbridge, Ontario

While many mills today are mounted on load cells, others employ bearing oil pressure as a proxy measurement of mill load. A control strategy recently implemented on a large variable-speed SAG mill at MMG's Century Zinc operation in Australia is shown in the chart (found on pg. 32). In this case, mill speed is the primary manipulated variable ...

The Brunswick lead/zinc mine, located 35km southwest of Bathhurst, New Brunswick, was formerly owned and operated by Noranda. In June 2005, Noranda merged with its 59%-held subsidiary, Falconbridge, with the 'new Falconbridge' …

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 required.

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 ...

The two main variables for controlling the SAG mills are feed and speed. Feed is presently controlled automatically via an expert system that adjusts the amount according to readings taken off of multiple bearing pressure load cells …

The power requirement differs between grinding mills and conveyors. The power needed for the conveyor is much smaller. "A SAG mill requires 30 MW and these types of converters are water-cooled," Dirscherl said. "These …