sag mill ore hard soft control

sag mill ore hard soft control

Rock Characteristics and Ball Mill Energy Requirements at

Jun 1, 2015 and rock characteristics of the ores being mined from three pits and the results were . groupings were identified; hard, medium and soft ores.


When Bond first developed his comminution law, crushers, rod mills and ball mills . o Extreme sample variability with a mix of extreme hard and soft ores . the potential application to control grind and throughput by maintaining optimum

IMPC 2016, Doll SAG data set SAGMILLING.COM

SAG mill power draw models are used in mill design and grinding circuit modelling to predict how much power will . control system.. Pshell, power . These surveys give a range of density for soft, high density iron ore and hard, low density

How to Improve SAG Mill Tonnage Grinding and Classification

Jun 17, 2018 The control of AG mills, fed by hard ores and soft components of oxide ore, can also be challenging, due to the sensitivity of the mill to the ratio

Continuous Monitoring of Mineral Processes with DiVA portal

the only grinding control is to maximize the power drawn by the mill. .. operator has to run the plant in such a way that the lowest grade crude ore gives an soft particle technique is more efficient than the hard particle approach for all

Integrated approach to monitoring and control of mineral grinding

also been monitored using model based soft sensors, see monitoring of mill feed has centered on the ore type determination, see been applied in the control of SAG mill feed .. ore was harder and too a high rotation speed was applied.

Small Scale Continuous SAG Testing Using the Macpherson SGS

autogenous mill, with an 8% ball charge and controlled by sound at 25% mill charge allow for soft and/or dense ores. . accompanied with a build up of hard.

Comminution Circuit Design vs. Feed Size or 'Mine to Mill 2.0'

pass through SAG mill onto ball mill circuits dilution. final wall control fine What is a competent ore and how does this affect comminution circuit design?,.

MEI Blog: SAG '15 Conference Diary

Sep 26, 2015 This was my first attendance at a SAG conference, MEI being a media divert increments bulk sorting, ore blending and feed forward control to . projects in Russia for hard and soft ores with SAG mills selected from the

Process monitoring with economic performance functions: Feasibility

between key controlled variables mill load, mass pull and particle size and Three faults i.e. increased ore hardness, poor steel ball quality and a load cell drift were simulated .. Fault characteristics and common faults in grinding mill circuits . Economic performance functions are difficult to develop and therefore, rely

sag mill grinding design versus geometallurgy Starkey and Associates

Sep 10, 2010 commercial SAG mill grinding conditions on 4.5 L of ore and Figure 1 highlights ores from two different projects with both soft and hard SAG milling . for risk management and mitigation, during mineral processing plant

SAG Mill Grinding Circuit Design 911 Metallurgist

Jun 4, 2018 AG/SAG mills grind ore through impact breakage, attrition breakage, and . In this case, the harder fraction of the mill feed builds up in the mill load, again on the SAG discharge screens, top size control to the ball mill circuit feed is itself to the SAG circuit as coarser than softer oreless comminution is

SAG Mill Testing Test Procedures to Characterize Ore Grindability

SAG MILL TESTING AN OVERVIEW OF THE TEST test, because harder components may .. This control system to allow for soft and/or dense ores.

SAG Mill Control: It Shouldnt be that Hard WOMP

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

The Selection Design and Application of Mill Liners for Large Wet

Liner design ,with the advent of large diameter SAG mills, the issues of design Softer ores . the hard, discontinuous, X7C3 eutectic carbides present in the.

Expert mill control at AngloGold Ashanti SAIMM

and the broader holistic approach to mill control are discussed. The ROM SAG mill circuita brief description. The typical ROM SAG mill circuit is depicted in.

Locked charge starts and your grinding mill Outotec

ball mills: Insufficient ball charge. A high ratio of ore to ball charge in Hard start of mill motor, a Liquid Resistor Soft Starter LRS Today's mill control.

Characterization and Modeling of Semi Autogenous Mill

Sep 2, 2011 unmeasured disturbances which make the process very difficult to control. applied to control of SAG mills with variable success; at the same time, Keywords: Mineral processing, SAG Mill, Ore size distribution, Process control, Visual sensors. . using model based soft sensors Casali et al., 1998; Apelt.

Autogenous mills, semi autogenous mills and ball mills for Polysius

ores, cement clinker, coal and other materials. Polysius has been Polysius grinding mills can be of the overflow type or of grate dis . ing quality control of the gear toothing . of the art hardware and soft ware economy despite the tough.

JK Drop Weight Test in Detail JKTech

characteristics of a sample of ore in an AG/SAG mill. breakage resistance and is used for comparison with other samples with lower values indicating harder ore in terms of social responsibility, risk management, and sustainability Hard. Hard. Soft. Soft. A*b. <30. 30 38. 38 43. 43 56. 56 67. 67 127 >127 ta. <0.24.

Integrating HPGR into minerals processing circuitsEngineer Live

Oct 17, 2013 The HPGR is ideal for hard competent ores with high resistance to traditional In soft or high clay content ores, a conventional SAG mill with or

Page 4 Manta Controls

control of SAG and AG mills to utilise new advanced control techniques. These techniques are operability and control of grinding circuits where direct tipping and ore . the mill is being worked harder and using more of the available power draw. consists of three coarse ore feeders and one soft ore feeder supplying a.

What Can Go Wrong in Comminution Circuit Design? CEEC

project viability is generally more pronounced when treating hard ores than average to soft ores due to the greater impact on capital and operating costs. SAG mill based grinding circuit for 'typical' ores of a moderate competence range. .. control the discharge from the mill by specifying the pebble port size with the

Grinding Mill Liners An OverviewDamian ConnellyPulseLinkedIn

Jul 22, 2016 Improved liner design can result in improved mill grinding They are manufactured in manganese steel which often spreads metal flow and makes removal difficult. . A new mill and soft oxide ore is an extremely high risk scenario for Sensible and controlled changes in consultation with the operator

MINE TO MILL ResearchGate

case Study #1 Blasting for increased SAG Mill throughputExample C .20 The control and reduction of dilution is an important aspect of M2M, and hardness with lower values of B indicating harder ore. JKSimBlast is supplied by Soft Blast Pty Ltd, Brisbane,.

sag milling in australia focus on the future Orway Mineral

Finally, future developments are anticipated in mill design and control, and mining industry, which was mainly treating soft oxidised ores of low competence. By 1997, the applications were shifting to those capable of processing harder, more


processes vibration from three key points on the SAG mill. From these The rightmost snapshot was taken when clay no hard ore was being . Similarly, if softer material is fed to the mill, the feed will need to be increased to maintain the.

sample thesis title with a concise and accurate UQ eSpace

AG mills exclusively use ore as grinding media, while in SAG mills steel where the control of AG mills fed by ores with harder and softer components.


Sep 30, 2015 Autogeneous AG grinding mills have seen increased application in large much earlier in the process and improved control to optimise size . Perth WA Fig 9a Mill product to DMS from soft and hard ore Fig 9b Mill

SAG Mill Optimization using Model Predictive Control

Semi Autogenous Grinding mills can be optimized for maximum ore However, SAG mill weight is difficult to control as the dynamic response changes.

milling control and optimisation - Mintek

Millstar Ball Load Estimator Smooth operation of a milling circuit is difficult to achieve due to: . MillStar's Segregated Ore Feed Controller is designed to:.

Relationships between comminution energy and - SciELO SA

intensity magnetic separation LIMS, and batch ball milling down to product sizes of . concentrate results are close for the hard and soft ore. Figures 5 and 6 that the ore hardness, expressed by the Bond ball mill work index, is controlled by.

SAG Mill Operation at Cortez - CCS Complete Comminutions

speed LCI drive that can control the mill speed from 36% to 80% of critical speed . Figure 7: Slurry Pooling and Lifter Packing with SAG Mill Limited Ore on 4 faster to grind the harder ore as well as the subsequent unnecessary and .. clearly changed somewhat to a softer ore with more clay, but it is still blocky.

Comminution - Minerals Engineering International

Apr 13, 2010 Mathematical models of grinding mills and crushers are undergoing significant advances in recent years, demanding ever more detailed information characterizing ore .. 08.30 Real-time statistical process control in crushing plants . 11.30 Investigation of the breakage of hard and soft components under

Asarco Ray, Plant-wide Control - KnowledgeScape

Currently because of hard ore conditions the SAG mill speed is run at 100% in fixed speed mode only. In the future, if soft or fine ore conditions are restored, we


throughput, make-up ball size, mill speed, liner profile and ball addition rates. At the same time, it can during best operating conditions, one is able to take control actions and keep the mill at its highest be categorized as direct, indirect, and soft sensors. For example For example when a harder ore is fed to the mill

SAG Mill Control at Northparkes Mines Not So Hard After All

Control is particularly difficult during periods when the feed ore is either But is SAG mill control the exclusive domain of rule-based approaches or can more .. power controller acts as a soft constraint and avoids power excursions above its

Optimisation of a Fully Autogenous Comminution Circuit

The industrial dynamic matrix controller commissioned on the AG mill resulted in a .. is also influenced by various unmeasured disturbances such as ore also difficult to manipulate in open circuit milling Napier-Munn et al., 1999. .. ω(t + k is mostly used to determine a smooth path that the process can follow.

Basics in Minerals Processing -

3:45. Technical data: Spherical roller bearing supported ball mills 4:18. Size control in crushing and grinding circuits . 6:62. Major process equipment components of iron ore pellet plant .. ore or mineral, wear will appear. There is of course a difference whether the minerals are hard or soft, small or large, abrasive or