Although the mill weight provides a reasonable and reliable indication of mill loading, it is known to be a challenge to control. Fortunately, the patented BrainWave controller has a unique ability to model SAG mill behavior so that responsive, precise control is possible. BrainWave accounts for changes in mill rotation, recycled pebbles, and ...
Alternatives that provide sound mineral processing routes, provide on-line mill control and are ... SAG mills respond well to a bi-modal feed, as reported in the work of Putland, Siddall and ...
The Manta Controls Advanced Control System, called the SAG Cube, automatically monitors and controls a SAG Mill, keeping track of critical process variables impacting mill throughput. For most sites, one hour of operation provides a revenue between AUD$ 20,000 per hour up to or greater than AUD$ 100,000 per hour.
SAG Mill process control classically maintains the SAG mill volumetric filling within a set operating range. Typically a SAG mill weight measurement, by either bearing pressure transducers or load cells, is used as an inferred measurement of volumetric filling. To maintain volumetric filling within a set operating range the SAG weight setpoint use for process control requires regular review ...
SAG mill control. Then, due to the excellent results obtained, more applications were implemented for other processes along copper concentrators in Chile. Presently, all process operators aim to ...
The filling rate of steel ball in the shell of the semi-autogenous mill is a main item to distinguish SAG mill and autogenous mill. In order to eliminate the impact of the accumulation of rock, the autogenous mill allows to add about 3% of the ball (Φ80 ~ Φ120), SAG mill steel ball filling is generally 8% ~ 12%, even up to 15%.
The microphones for the sound level are typically placed as close as possible to the mill shell at the likely strike point of the balls with a fully charged mill. This closeness helps reduce interference by external noise sources such as crane …
Expert mill control has been successfully installed at AngloGold Ashanti South Africa's Mponeng and Kopanang Gold Plants. Expert control has also been installed at AngloGold Ashanti's …
Advanced Control of SAG Mill Grinding Circuits . Sound is assumed to be a measure of the breakage conditions at the impact zone of balls (and to a lesser extent, rock) in the mill. High sound levels occur when the ball strike point distribution is high on the liner wall and not overlapping the mill charge toe. Low sound levels occur when the ...
Mill Process Control Automation Control System Back. Ore Receiving; Solids Level Measurement Smart Meter Verification Ore Receiving Back. Conveying ... We understand the importance of the SAG mill and have the proper tools to accurately monitor the temperature of the mill's motor. This prevents overheating conditions, reduces lost production ...
SAG Mill Control . SAG mills can be optimized for maximum ore throughput or maximum grinding energy efficiency. In both cases, precise control of the mill filling percentage is critical (Wills and Napier-Munn, 2006). Maintaining constant mill weight, as indicated by bearing pressure, is one approach to stabilize the mill
SAG Mill process control classically maintains the SAG mill volumetric filling within a set operating range. Typically a SAG mill weight measurement, by either bearing pressure transducers or load cells, is used as an inferred measurement of volumetric filling. To maintain volumetric filling within a set operating range the SAG weight setpoint use for process control …
SAG mills typically have higher grinding efficiencies compared to AG mills, but this can vary depending on the ore characteristics and the operating conditions of the mill. ... For example, if the application requires a high degree of control over the grinding process, a SAG mill may be more suitable due to its ability to handle larger volumes ...
and the broader holistic approach to mill control are discussed. The ROM SAG mill circuit—a brief description The typical ROM SAG mill circuit is depicted in Figure 1. The circuit is usually closed with either a screen or, more commonly, a cyclone for product size classification. The focus of control can be divided into two parts, viz. the
Started Control SAG Mill sound detection: https://
The value of investing in the proper sAG mill for start-up and the decision to make this investment, need to include an incremental analysis of the extra ... how to control mill throughput using good mine planning, based on real data. Feed Size, F80: Primary crushed ore is mandatory to feed any SAG mill. Typical feed size range is
By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebble-crushing circuit product to the ball-mill sump for secondary milling: while convenient, this has the ...
For example, HIGH WEIGHT will be more important than HIGH SOUND. Another example is given in the following table. Table 1. ... Considering the above, it is the author's proposition (as well as Jonas, 2008) that regarding SAG mill control the best results are obtained by the use of Multivariable Predictive Control only if an easy, affordable ...
We use electronic ears here on Sag mills. The signal is converted to 4-20 and goes into the PLC and is transfered to the DCS and Expert Control system. The sound is used to …
The SAG mill, also known as the Semi-Autogenous Grinding mill, is a crucial piece of equipment in the mining industry. In this blog post, we will delve into the world of SAG mills, exploring their components, working principles, operation, advantages, limitations, applications, and future developments. ... Limited control over product size ...
A SAG Mill trommel screen lets you control the true discharge size of your SAG mill or the transfer size to the downstream Ball Mill circuit.
To answer this question, let us redefine the goal of the mill operator. The goal of the operator is to optimize performance of the grinding circuit in terms of maximum tonnage, …
Taking care of a SAG mill through proper maintenance and repair is vital for long-term reliability and efficiency in copper ore mining operations. Real-life Examples of SAG Mills in Copper Ore Mining. SAG mills have been a critical component …
The chosen sampling frequency produced a frequency range predominantly within the audible sound range of the normal human ear (from 20 Hz to 20 kHz), as well as the frequency response ... Pethybridge, T., Rivett, T., Dunn, R., 2005. SAG mill control at Northparkes Mines (not so hard after all). MIPAC report. Google Scholar. Umapathy et al., 2010.
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 …
controls downwards; so without the advanced regulatory control layer, the comprehensive plant automation strategy cannot be properly built. In this paper, an industrially proven adaptive model-based predictive control strategy is reviewed and applications to SAG mills and flotation cells are presented. P124 09/03 3 of 12
Towards the development of an improved and more efficient online monitoring system in an industrial AG/SAG grinding mill, the present study employs a laboratory-based …
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Difference Between SAG Mill and Ball Mill, from the working principle, application, structure, etc. Grind and blend solid or hard materials into smaller pieces by means of shear, impact and compression. ... Strict process measures to control the machining accuracy of the joint surface stop, to ensure reliable connection and the concentricity of ...
SAG mill control on two sites in Australia that have adopted the new . control technology developed by Manta Controls called the Manta . Cube. OVERVIEW OF THE MANTA CUBE .
Historically many different signals have been employed in the quest for optimal automatic closed loop mill control. These include mill power, sound, elevator amps, bearing pressure and temperature as a few examples. However, within the last few years, a new technology is emerging that makes all these antiquated techniques obsolete. This new …
Mill Process Control Automation Control System Back. Ore Receiving; Solids Level Measurement Smart Meter Verification Ore Receiving Back. Conveying ... We understand the importance of the SAG mill and have the proper tools to accurately monitor the temperature of the mill's motor. This prevents overheating conditions, reduces lost production ...
Operation of large SAG mills requires a change in the conceptual approach to grinding processes. ... Samples of mill sound spectra, under low- and high- impact conditions ... PERFORMANCE ENHANCMENT TOOLS FOR GRINDING MILLS 107 The Impactmeter signals provide the information needed for mill control. By maintaining the critical impact rate in a ...
34 ft x 18 ft (EGL) SAG mill, 13 MW • Two 24 ft x 38 ft (EGL) ball mills, 13 MW each • SAB circuit • SAG mill limited • High diorite and skarn feed • Circuit grind ~ 106 μm • Theoretical maximum comminution circuit capacity 3100 t/h (SAG Ecs 4.2 kWh/t) • Flotation circuit capacity limit ~ 2700 t/h • Advanced process control ...
Mills require different liner profiles and designs depending on mill size, speed, charge, charge level, type, size of grinding media, expected service life, and – of course – ore size and properties, such as hardness and abrasiveness. SAG mill A SAG mill is usually a primary mill for grinding coarse ore directly from the crushed stockpile.
This document summarizes improvements made to the operation and control of SAG mills at the Batu Hijau copper-gold mine in Indonesia. Soft sensors were implemented to estimate mill load, grinding media levels, and stockpile characteristics in real-time. This provided operators valuable information to better control mill operations amid frequent ore variability. Initial results found …
