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47th ©Annual Canadian Mineral Processors Operators Conference, Ottawa, Ontario, January 2022, 2015 SAG MILL: OPERATING PHILISOPHY Prior to the expansion, Bell Creek was a twostage crushing and ball milling operation. The fact that the operational team was new to SAG milling, accentuated the need for the development of a ''site best
(EGL) SAG mill driven by a 24,000 kW gearless drive. The SAG mill feeds two FL ball mills each 26 ft. in diameter × 40 ft. long (EGL), each driven by a 16,400 kW drive. The SAG mill is one of the largest volumetric capacity SAG mills in the world and represented the first 40 ft. SAG mill in Peru (Garcia Villanueva, 2013 [1]).
The instrumentation installed on a SAG mill is integral to control. For example, the mill load and noise sensors are instruments that provide essential information for an optimized SAG mill operation. Insufficient understanding of the ore characteristics and feed composition can result in an ineffective SAG mill .
Nov 01, 2004· Fig. 2 shows a typical grinding circuit with a SAG mill and two ball mills. Grinding power is split into the SAG and ball mills. Commonly, when the SAG mill stops its operation, the other two ball mills should also halt Fig. 3 outlines the charge motion in the mill. The lifters lift the load and produce cascade and cataracting.
Improve the stability of the grinding (SAG / Ball Mills) and flotation plant (conventional and Jameson cells), through improved instrumentation and control strategies. Mipac Scope: Design, install and commission control loop in grinding and flotation plants; Specify novel instrumentation solutions (Flash flotation density control)
There is a great deal of activity directed toward improving ore characterization to predict AG/SAG mill energy requirements, as well as developing improved models and instrumentation for optimization and control of comminution circuits. Instrumentation, modeling, and control functions in particular have benefited from rapidly advancing computer ...
Figures 8 and 9 on the right show results from a gold plant''s SAG mill achieved with MillStar''s Segregated Ore Feed Controller combined with the Power Optimiser: • The standard deviation of the mill feed control is greatly reduced. • The cyclone feed is more stable, allowing for consistent size separation and feed to downstream processes.
instrumentation of sag mill. Measurement and control of the rate of addition of new feed and water to the primary mill is relatively easy Instrumentation is simple accurate and reliable If the primary mill is run in open circuit the only additional information the operator needs to properly control this circuit is the particle size distribution in the mill discharge
DESCRIPTION Saw to all mechanical installation work, including the installation of: A 38'' x 22''½", 26,000HP ABB/ SAG mill; Three 24'' x 37'' twinmotor ball mills of 16,000 HP each; An FL XL 1100 crusher; and Two XL 2000 crushers, the largest cone crushers in the world.
The project (total project value ≈ USD billion), includes crushing, SAGBall milling, bulk flotation, selective flotation, concentrate transport, tailings disposal and water management. This position is responsible for the approval of all engineering design made by Industrial Construction Group, ICG Kazakhstan, based on Ausenco ...
your SAG mill. Output signals tied to the control system make the mill react to the acoustic data, and other existing SAG mill instrumentation. Robust mill liners Utilising new technologies, we have designed mill liners that increase safety and enable you to more accurately plan your liner''s life.
MillSlicer has been developed for the mining industry, specifically for use on SAG/AG mills. The MillSlicer utilises vibration sensors and digital signal processing technology to provides information about the inlet and outlet conditions, and what is happening at each of the 360° of the mill.
Each milling circuit is unique, and as such the goals and most optimal control strategy might differ for individual cases. Process IQ is an expert in implementing control systems for SAG and Ball milling circuits, making use of advanced stabilisation and optimisation strategies developed by Mintek.
Piping and Instrumentation Diagrams 110PI001 Area 1101 Run of Mine (ROM) – Coarse ore Storage and Reclaim 120PI001 Area 1201 SAG Mill Grinding and Screening
Specifically designed for the SAG mill, a new device is presented that digitizes and processes vibration from three key points on the SAG mill. From these three realtime signals, it is possible to measure the volumetric material fill level in the mill and the material flow through the mill.
The SAG mill reduces ore fragments with a maximum size of 250 mm (P 80 = 152 mm) down to 2 mm, and the ball mill reduces the SAG mill product to about 74 µm. Grinding is followed by flotation. The ball mill measures x 14 m; Get Price; ag ore grinding mill motor types. SAG Mill Grinding Circuit Design. Grinding The ore is ground into a fine ...
Instrumentation and control of a continuous 06m SAG mill circuit Int J Miner Process 24 217234 A 60cm semiautogenous grinding SAG mill was designed for continuous wet operation in closed circuit with a vibrating screen The circuit is fully instrumented and automated .
SKF supplied a customdesigned heavy duty bearing housing assembly and two IMXS conditioning monitoring systems for a 12 MW SAG mill operating on a gold mine in West Africa. "This is the first combination online condition monitoring system and drive train solution for a SAG mill supplied by SKF," says project manager, John Storm.
Nov 01, 1988· Instrumentation and control of a continuous SAG mill circuit. Int. J. Miner. Process., 24: 217234. A 60cm semiautogenous grinding (SAG) mill was designed for continuous wet operation in closed circuit with a vibrating screen. The circuit is fully instrumented and automated.
The power draft of a SAG mill and its consequences are illustrated in Figure 2, wherein 5 days of operating data in a 32u14ft SAG mill is plotted. The power draft of the mill is held between 6 and 7 MW, whereas tons per hour (tph) of ore feed to the mill shows wide variations between 1,000 and 1,600 tph.
Nov 01, 2004· Fig. 1 depicts a gearless mil drive, where the mechanical power is transferred electromagnetically between the stator and poles of the rotor (Errath et al., 2003).Due to the mass flow, materials, and power involved in the process, SAG mills face the problem of highenergy impacts caused by steel balls cataracting against the shell of the mill, with loss of energy and accelerated breakage of ...
Instead, SAG mill process control systems that aim to maximize SAG mill federate should target operation at the optimal volumetric mill filling for the prevailing feed. Despite the importance of volumetric mill filling, a measurement is not traditionally provided to the mill operator or metallurgist by instrumentation (Toor, 2015).
The SAG mill controller precursors were assessed for low and high feed rates. • The Phu Kham SAG mill control philosophy was referred to during the PI data evaluation. • The baseline operating conditions were then ranked based on low (<2000 t/h), medium (2000 – 2500
For SAG and AG mills there is an inverse parabolic relationship between mill power and mill load as shown in Figure 3. Thus maximum grinding efficiency, and therefore maximum production rate, occurs at the point of maximum power on the power/load relationship.
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