Choosing a SAG Mill to Achieve Design Performance
Provide a motor with the capability to deliver design power on a continuous basis by including a suitable service factor, usually 15% to cover any drive losses and …
(PDF) Real-Time Estimation of SAG Mill Charge …
Where they are installed, load cells measure the mill and charge total mass. Where load cells are not installed, the total mass can be inferred from bearing pressure. …
MONSAG: A new monitoring system for measuring the load filling of a SAG
Process variables like bearing pressures or load cell measurement can be applied for better correlation. 3. Actual application and resultsThe outlined method was applied in a 36 × 17 ft −15 000 HP (11.2 MW) variable-speed semiautogenous (SAG) mill for copper ore concentration with nominal throughput of 24 000 tons per day. The mill is …
Optimal mill loading with LoadIQ
Maximise mill throughput with LoadIQ. Automatically determines the optimial SAG mill load for all grinding conditions and sets the load target in real-time.
A Comprehensive Guide to SAG Mill Operation
A SAG mill consists of a rotating drum filled with steel balls or rods, and the rock that needs to be ground. The drum is mounted on a stationary structure, which houses the motor, gear, reducer, and bearings. ... The mill weight is measured by load cells or a strain gauge, and the controller adjusts the feed rate accordingly. SAG mills can be ...
INFERENTIAL MEASUREMENT OF SAG MILL …
SAG mill powerdraw [kW] SAG mill load cell [t] Cyclone feed water addition [m 3/hr] Cyclone feedrate [m /hr] Cyclone feed density [% solids w/w] Oversize c rusher feedrate [t/hr] Ore is fed to the SAG mill for primary grinding. The mill discharge is screened with the oversized material
Integrated advanced process control with a sag mill …
The Impactmeter is an advanced SAG mill performance monitoring instrument developed to measure load generated impacts and provide mill liner protection through the use of …
Toe angle measurement for SAG mill control at Lihir gold …
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 …
Integrated advanced process control with a sag mill …
(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]).
SAG Mill Process Control
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 ...
Process optimisation for your SAG Mill
Conditions inside your mill are automatically adjusted to minimise liner damage, stabilise and then optimise the operation of a SAG Mill. With the combination of ECS/ProcessExpert and LoadIQ, your mill will grind more efficiently, helping to reduce energy consumption while lifting throughput and extending the life of your mill liners and ...
MILLING CURVES AS A TOOL FOR CHARACTERISING …
MILL FILLING AND LOAD As already discussed, SAG mill filling is a critical parameter for SAG mill ... Load Cells Reading, t Mill Filling, % Mar'06; 9.1% ball; Fully worn lifters Jul'05; 7.9% ball ...
AG & SAG Mill Grinding Circuit Automatic Control
More recently, Asea Brown Boveri have introduced a load cell which operates on the principle of a magnetoelastic effect on a susceptible piece of metal. It has no moving parts, and has been used extensively in steel rolling mill applications and recently under a large diameter SAG mill. ... For the high tonnage tests feed rates …
SAG milling & grinding pilot plants
AG/SAG mill: One of the few remaining Hardinge 6' x 2' high aspect pilot 18 kW SAG mills in the world is fully operational at the ALS Metallurgy, Balcatta campus in Western Australia. Installed with a shell hatch to facilitate easy charge removal, the mill is installed on load cells connected to a SCADA system to collect mill weight, mill ...
SAG Mills Load Cells
Yes, you add load cells to existing SAG Mills; it depends on the type of mill bearing support system. They are normally button type compressive cells. With Polysius mills they are integral in the Feed end bearing pedestals and provide a load signal out via an amplifier …
A guide to SAG Mill management
The cornerstone of effective SAG mill control lies in accurately measuring the mill load. There are two primary methods: Direct measurement: This method utilises …
Inferential measurement of SAG mill parameters III: …
This paper discusses inferential measurement models for semiautogenous grinding (SAG) mills. Inferential measurements of SAG mill discharge and feed …
Semi-autogenous mill power prediction by a hybrid neural …
There are few methods of semi-autogenous (SAG) mill power prediction in the full-scale without using long experiments. In this work, the effects of different operating parameters such as feed moisture, mass flowrate, mill load cell mass, SAG mill solid percentage, inlet and outlet water to the SAG mill and work index are studied. A total …
Optimisation of a SAG mill though trajectory and power milling
Mill filling is an important operational parameter in a SAG mill circuit and by its control and optimisation it can produce significant improvements in production capacity and energy efficiency. However, it is industry practice to report mill load as the total output given by load cells, or kPa for systems based on lubrication bearing back ...
understanding size effects of semi-autogenous grinding …
The SAG mill has four load cells installed at . 13TH AUSIMM MILL OPERATORS' CONFERENCE / PERTH, WA, 10–12 OCTOBER 2016 understAnding siZe effects Of semi-AutOgenOus grinding mill OPer AtiOn As A PAthWAy tO sOlVing feed disturbAnces 323 the discharge end of the mill, two at ±16.5° (F1 and F3), and
Bearing pressure to mill load control
To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN; Use Add New Topic to ask a New Question/Discussion about Grinding.; OR Select a Topic that Interests you.; Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.; …
comparison mill load cell readings and calibrated mill filling …
Thereafter, this idea was investigated by Toor, Franke, Powell, , and Waters (2013) on the 32 ft semi-autogenous grinding (SAG) mill at concentrator Two at Newcrest's Cadia Valley Operation (CVO).
Optimisation of a Semi-autogenous Grinding Mill through
Mill filling is an important operational parameter in a SAG mill circuit and by its control and optimisation it can produce significant improvements in production capacity and energy efficiency. However, it is industry practice to report mill load as the total output given by load cells, or kPa for systems based on lubrication bearing back pressure, rather than …
Systematic calibration of a simulated semi-autogenous/ball-mill
Westwood grinding circuit. 2.1 Semi-autogenous mill model The grinding process in a SAG mill as described by Sbárbaro (2010) is st ti li ti f si l t s i- t s ll- ill i i i it . . érez- arcÃa ∗ J. ouchard ∗,∗∗ . oulin ∗,∗∗∗ ∗ niversité Laval, L, entre 4, avillon drien- ouliot ...
MONSAG: A new monitoring system for measuring the load filling of a SAG
The article discusses the topic of the specific power consumption of a drum mill type SAG 8.5x5.3. The purpose of the study is to<br> determine the influence of some basic parameters like angular velocity of the mill drum, the wear on the drum's lining, mass of the mill filling, loading rate of the mill with ore and flow rate of incoming water of the …
Methods to Estimate AG/SAG Mill Power Requirements
A linkedin group was recently discussing this by asking: I've tried to estimate AG/SAG Mill power requirements using several different methods: (1) Using the results of SMC data (2) Using SAG Power Index (SPI) data (3) Using the 1989 Barratt method updated on Alex Doll's Web site (February 16, 2015) (3) Using Don Burgess' …
Developments in the understanding of South African style SAG …
Although this was a low aspect SAG mill operated with a very high ball load in closed circuit, the power response is generic. ... This indicates that for a mill on load cells two points can ...
Ball Mill Circulating Load
Calculating a grinding circuit's circulating loads based on Screen Analysis of its slurries.. Compared to %Solids or Density based Circulating load equations, a more precise method of determining grinding circuit tonnages uses the screen size distributions of the pulps instead of the dilution ratios.Pulp samples collected around the ball mill or rod …
Online SAG Mill Pluse Measurement and Optimization
The load cell package was successfully used to produce impact spectra in an 8.5 inch lab scale mill. The mill speed and the ball size were varied to study their effect on the impact spectra. A good correlation was found between the process variables and the impact spectra. The load cell package was then used in a 16 inch pilot scale mill.
What's the Difference Between SAG Mill and Ball …
A mill is a grinder used to grind and blend solid or hard materials into smaller pieces by means of shear, impact and compression methods. Grinding mill machine is an essential part of many industrial …
Ball Mill vs SAG Mill: What's the Difference?
Here we will give you a complete guide on what is a ball mill vs SAG mill, how they are different, and how they are used. Let's get started! Operating Principle. The operating principle difference between a ball mill and a SAG mill is their specific energy consumption. Ball mills use an induced storage mechanism to grind materials.
Understanding the SAG Mill in Copper Ore Mining Process
While the VSI Mill may have some benefits in certain applications such as tertiary crushing or producing sand for construction purposes, it still remains a relatively niche technology within the mining industry. SAG Mill. A SAG mill, also known as a semi-autogenous grinding mill, is one of the essential equipment used in copper ore mining.
SAG Mill | Autogenous and Semi-Autogenous Mills
Key design features: Robust head castings and shell fabrications resulting in low stress levels and longer operating life; Mill designs are supported by a full suite of design analysis reports including rotating body finite element analysis, main bearing fluid film analysis, drivetrain steady state torsional analysis as well as gearless mill dynamic modal …
How Mill Load/Charge is Estimated
Sag mills in the gold and copper operations would vary from 6%- 15% and are normally grate discharge types in most cases the densities of the slurry in the mill is over 65% and that goes for ball mills also. ... Modern mills operate with load cells and mill optimizer's which synchronize the mill weight, power draw, ore feed and weight with ...
AG – Autogenous & SAG Semi-Autogenous Mill Design …
Because SAG mills rely both on the ore itself as grinding media (to varying degrees) and on ore-dependent unit power requirements for milling to the transfer size, …
Ø Effect of SAG Mill Feed Size Distribution and Ore …
SAG Mill Load Ball Charge - SAG mill power draw was guaranteed by the vendor at 13% ball charge and 30% total volume to be 20.96MW for the 40 foot diameter SAG mill. In practice this power draw was never achieved I-14 (Dunne et al 2001). Power draw ranged between 18.0MW and 19.0MW. In order to draw more power the options immediately …