Choosing a SAG Mill to Achieve Design Performance - Starkey ...
A great deal of effort has been expended in the last 11 years by the authors and others to identify the correct power required to grind ore in a SAG mill, by developing ore hardness variability functions for the ore body to be mined. This paper describes the next step in the SAG design process, which is choosing a SAG mill to...Read More
IMPC 2016, Doll - SAG data set - SAGMILLING.COM
P=K D2.5 L(1−AJtotal)[(1−εB)(ρsoli d s. wC. )Jtotal +0.6Jballs (ρballs− ρsolids. wC )]ϕC(1−. 0.1. 29−10 ϕC ). (1). Where:. A and K are empirical fitting factors.. D is the mill diameter inside the liners, m.. Jx is the mill filling of component x, as a fraction of total mill volume (e.g. 0.3 for 30%).. L is the mill effective grinding...Read More
SAG Mill Testing - Test Procedures to Characterize Ore Grindability
For AG/SAG mills, this may result in a critical size build- up and associated throughput losses. The importance of steady-state testing increases with the ore heterogeneity. On the other hand, the batch .... in a 6' x 1' mill using ten large rocks in five size fractions in the ... by maintaining a pre-set sound level with a microphone...Read More
INCREASING SAG MILL CAPACITY AT THE COPPER ... - CEEC
20' EGL SAG mill, a Raptor 900 pebble crusher and two 24' x 39'6” ball mills. Each mill is equipped with ... (refer to Figure 1). The region has a long history of copper mining dating back to 1923. The Copper. Mountain camp occurs in the 'eastern volcanic belt' of the Nicola Group (Monger, 1989). It is an alkali copper-gold...Read More
Using Fuzzy Control to Optimize SAG Mill Production - WordPress.com
and numbers but in terms of fuzzy sets. These fuzzy terms define general categories, but not rigid, fixed collections. The transition from one category-concept, idea, or problem state-to the next is gradual with some states having greater or less membership in the one set and then another. Specifically, the concept of fuzzy sets...Read More
A structured approach to the evaluation of the energy ... - SAIMM
benefits of HPGRs relative to SAG mills in comminution, and about .... pictures, the simulation produces a comprehensive set of information, among them .... 0.92. 16 428. 7.17. Totals. 25 286. 11.03. Energy savings HPGR circuit—Case A. 25.1%. SABC—Case B. SAG mill—11.6 m D x 5.5 m L ( 38 x 18 ft ). 1. 15 000. 13 766.Read More
1 COPPER MOUNTAIN: OVERVIEW ON THE GRINDING MILLS ...
This paper will first give a short overview of the Copper Mountain project in British Columbia, which just has started commercial operation earlier this year. The grinding process with one 34' x 20' SAG mill and two 24' x 39.5' ball mills will be briefly discussed. All three mills are gear driven by a ring gear, dual pinion and two...Read More
Mill drives - Future of Manufacturing
1 | Page. MILL DRIVES: THE DESIRE FOR INCREASED POWER AND THE ASSOCIATED LIMITS. AND CONDITIONS. *D.J. Barratt1, M.N. Brodie1 and K.Tischler2. 1DJB Consultants, Inc. .... Once the power level for the primary (SAG) mill has been set, i.e., design tonnes per hour (tph) x design E total kWh/t from the...Read More
Grinding Mill Control Types - Grinding & Classification Circuits ...
Apr 4, 2017 ... Having used weight control and power draw to control Mill operations, using Mill Sound to run a mill was a new one for me. I found it unusual and not that ... The trend in mill liner shapes has changed from olden days when the liner/lifter pitch set = 2 x mill diameter in (ft.). Today, the liner pitch set should be...Read More
Mineralogy and Major Ore Types. Abundance of major ore types: Ore Type. Relative Abundance (%). Hypogene. 63. Supergene. 20. Skarn 1. 6. Skarn 2 / High Zn. 11 .... Grinding. • two parallel SAG / ball mill grinding lines with pebble recycle circuits (SAB): o. SAG mills: 10.97 Ø x 7.3 m EGL, 16 MW (dual pinion) o ball mills:...Read More
Continuous Monitoring of Mineral Processes with ... - DiVA portal
Continuous Monitoring of Mineral Processes with a Special Focus on Tumbling Mills – A Multivariate Approach ..... within Y are correlated (Kresta et al.,1991). Consider first the case where only one of the data matrixes is of interest, eg. X. PCA is a procedure (Andersson, 1984; Mardia et al., 1982) which attempts to explain...Read More
sample thesis title with a concise and accurate ... - UQ eSpace
an AG/SAG mill (throughput, product size and power draw) is dependent on the feed composition and it could be ...... describe the feed and product stream, handling only one set of ore hardness parameters A and b. Therefore ...... B(x,y) : describes the cumulative percentage passing size 'x', resulting from the breakage of a.Read More
Overload Detection in Semi-Autogenous Grinding: A Nonlinear ...
with a linear classifier has been proposed to detect the early onset of an overload in a SAG mill. ... 1. INTRODUCTION. In a mineral processing facility, grinding is one of the most fundamental unit operations, and a semi-autogenous grinding. (SAG) mill is often ..... step is to find its K neighbors, Xη, in the training data-set X.Read More
Com 12 - Primary SAG Mill Grind Control Final - Blue Cube Systems
1. Optimization and Control of a Primary SAG Mill Using Real-time Grind. Measurement. C.W Steyn*, K Keet**, W Breytenbach***. *Control Engineer, Anglo American Platinum, Control and Instrumentation ... Each Module at Waterval Concentrator (WvalC) employs a φ7.3 m x 8.2 m EGL SAG mills with 2 x 5200 kW motors in...Read More
MEI Blog: Where are SAG mills going?
Aug 25, 2014 ... SAG mills are under-designed, and this occurs because of simulation techniques that pass one error on to another design, and the mistaken ... Gregg has set the target with his comment that “emerging processes will be to a large extent autogenous and will impart more energy intensity” although, as John...Read More
Modelling and simulation of mineral processing ... - Semantic Scholar
Circuit: 1 x SAG mill /pebble crusher/2 x ball mills in SABC configuration. For this design exercise, JKSimMet was used to build a general model of the proposed SABC flowsheet. Once the model was constructed, different typical and realistic SAG mill diameter / length dimension combinations(available from mill vendors)...Read More
COMPARISON OF HPGR - BALL MILL AND ... - Open Collections
focused on the energy and cost comparisons of the existing AG/SAG ball mill circuits with two proposed ...... Koeppern has developed Hexadur® wear lining, a hard and abrasion-resistant material set into a softer matrix .... comminution circuit consists of one 60” x 113" primary gyratory crusher, four MP-1000 secondary cone...Read More
Slurry discharge capacity of autogenous and semi-autogenous mills ...
then conducted by using sets of independent data. ... 1. Introduction. The degree to which slurry is held up within autogenous (ag) and semi-autogenous. (sag) mills influences their grinding capacity and power draw. The roles of the grate ..... Flowrate from the above equations is in terms of water and solids < x m. However,.Read More
1 TAKING CONTROL OF THE MILL FEED: CASE STUDY - PARTIAL ...
The 8.53 m Ø x 3.92 m EGL (28 x 12.8-ft) SAG mill is fitted with two 1850 kW motors. An operating ball ... grinding circuit. Figure 2 : PFD of Mt Rawdon comminution circuit before optimisation. Pri Crush. Final Product. 8. Ball Mill. 9. 1. 2. 3. 4. 6. 5. 7. 1. Process. Gravity. SAG Mill .... at a coarse closed side set on the secondary...Read More
A COMPARISON OF WEAR RATES OF BALL MILL GRINDING ...
methodology was applied to investigate the wear rates of four grades of grinding media using two small laboratory ... Ball mill balls experience a greater number of impacts, but at lower magnitude than SAG mill balls, due to the smaller ball size, and smaller mill diameter. .... flat 3 x 1 x 0.25 inch piece of SAE chrome-.Read More
Services - EdRockMan IV LLC
Harold one of our members, changed the Roller Bearings on a 5.8 m x 2.29 m 1300 kW EGL Sag Mill and a 3.6 x 6.2 m 1300 kW EGL Ball Mill. Penoles- La Cienega Project – Mexico Responsible for the installation, commissioning and startup of a 4.5 m X 6.6 m EGL 2200kW Ball Mill and I also trained the Maintenance and...Read More
Chapter - M MODELLING, SIMULATION, OPTIMIZATION 02'(//(0 ...
proposed flowsheet consists of existing SAG mill circuit followed by a new proposed ball mill in closed ..... The Plitt's model includes two sets of variables ...... Huang, 2006) . A fuzzy number M. ~ is a convex normalized fuzzy set M. ~ of the real line R such that it exists such that one. R x ∈. 0 with. 1)(. 0. ~. = x. M μ. ( 0 x.Read More
Choosing vibration monitoring methods / Applications / Maintworld
Grinding mill finds continuous online surveillance of vibration to be cost-effective after conversion from offline system. ... The ones used in mining operations in Canada are essentially autogenous, but use grinding balls to aid grinding, like in a ball mill. A SAG ... 3: Installation set-up for the online system and accelerometer.Read More
using the smc test® to predict comminution circuit ... - SMC Testing
www.smctesting.com. 3. Tumbling mills. For coarse particle grinding in tumbling mills equation 1 is written as: ( ). ( ). (. )1. 2. 1. 2. 1. 4 xf xf ia a x x. MK. W. -. = (4) ... x x. MKS. W. -. = (9). Sh. = coarse ore harness parameter as defined by equation 8 and with Ks set to. 35. K3. = 1.0 for all HPGRs operating in closed circuit with a...Read More
Sag mill (Enderio) and the catalyst function : feedthebeast - Reddit
You have the option to boost your sag mill with flint or other items and I'm playing with ozone lite and there I managed to automatically convert... ... Put a drawer on one face of the SAG mill. Lock the drawer. Put flint in it. Set the SAG mill to push/pull on that face. It will automatically put the flint in the drawer...Read More
Evolution of SAG Mill Process Control at the Xstrata ... - WipWare
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. P0M 1S0. PH: (705) 693 2761 X...Read More
SAG Mill Tutorial [EDEM 2.7.2 and older] - DEM Solutions
This tutorial describes how to set-up and analyze a SAG (Semi-Autogenous Grinding) mill simulation. There are 14 short steps that ... The SAG (Semi-Autogenous Grinding) mill is a machine designed to to grind smaller particles and break larger rocks. Particle breakage will ... Step 1: Creator - set up the global parameters. 2...Read More
Yanacocha Gold Single Stage SAG Mill Design, Operation and ...
1/8-10 Chapman Place. Eagle Farm, Brisbane, QLD, Australia. walter.valery@Xinhai.com. 2. OPTIMISATION OF THE SINGLE STAGE SAG MILL CIRCUIT AT THE YANACOCHA. GOLD MILL. ABSTRACT. This paper describes the design, the first three years of operation and optimization of a large,. single stage SAG mill at...Read More
Model Predictive Control of SAG Mills and Flotation Circuits
Precise control of SAG mill loading and flotation cell level is critical to maximize production and recovery .... and applications to SAG mills and flotation cells are presented. ... k +1 k k y = y +cΔx k k −1 k. Where u is the input variable, which is adjusted to control the process variable y . x is the nth- order Laguerre model state.Read More
SAG Mill Optimization using Model Predictive Control
Model predictive control provides an additional tool to improve the control of Semi-Autogenous Grinding mills and is often ... SAG mill, model predictive control, MPC, expert systems, optimization, Laguerre .... one method that involves minimizing an objective (cost) function J(*) of the predicted set point tracking error and...Read More
1 DEM SIMULATION OF MILL CHARGE IN 3D VIA GPU ...
Discrete Element Method simulation of charge motion in ball, SAG and autogenous mills has become a standard for .... the code. These data are usually set with reference to the three dimensional (X, Y, Z) axis. ... Table 1 gives the details of mill design and operating variables for two AG mills, one SAG mill, and one ball mill.Read More
ONLINE SAG MILL PULSE MEASUREMENT AND ... - OSTI
Several experiments were performed in an 8.5 x 9 inch laboratory scale ball mill. This set up is meant for ... Many large mining operations have one or more semi-autogenous (SAG) mills doing bulk of the work in ... motions and interactions of a set of individual particles and moving walls, as affected by gravity, models for...Read More
IMPROVING ENERGY EFFICIENCY VIA OPTIMIZED ... - OSTI.GOV
Operation of SAG Mills. 5. 1.1.1 Field of breakage. 6. 1.1.2 Flow through the grate and pulp lifters. 7. 1.1.3 Charge motion. 7. 1.1.4 Mill power draft. 8. 1.2. SAG Mill Efficiency. 10. 2. EXECUTIVE SUMMARY. 11. 3. EXPERIMENTAL SET-UP. 12. 3.1. Pilot Grinding Mill Set-up. 12. 3.1.1 Discharge Grate and Pulp Lifter. 13.Read More
Optimization of the single stage SAG mill circuit at the ... - Xinhai
The YGM grinding circuit consists of one 9.75 m x 9.75 m (32' x 32' EGL) SAG mill with an installed power of .... set of plates. •. Lifter height varied from tallest lifters in first quarter of mill length to a shorter and rounded top lifter in the last quarter of mill length to account for differential wear rates along the mill length observed...Read More
Mining Mill Braking Technologies | Altra Industrial Motion Newsroom
Figure 1: Sossego 38' x 23' Long SAG Mill ... A typical braking system consists of one or more brake calipers, mounted onto two pedestals, one each side of the mill, symmetrical about the horizontal mill centerline. .... If the stopping time is too severe adjustments can be made during initial set up using the hydraulic system.Read More
case study - Bradken
Case Study_Combating SAG Mill Feed End Wear with White Iron inserts ... The Challenge: Increase the wear life of the Feed End liners in a 32' x 16' SAG ... removal from mill - inner liner with WI insert demonstrates maintained lifter height. Original liners without inserts. Middle liner with white iron insert. Liner. Qty per. Set.Read More