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Get PriceSimilar to the impeller design affecting pump capacity the pulp lifter design affects the discharge capacity or mill throughput of AG and SAG grinding mills Generally the discharge from AGSAG mills consists of one or both of the following components slurry water and

- Optimal Control Of Grinding Mill Circuit Using Model
of quality and production rate adequate control of the circuit is required The usual control objectives for a grinding mill circuit are to improve the quality of the product to maximise the throughput to decrease the power consumption to reduce the usage of grinding media and to

Get Price - Reducing The Number Of Size Classes In A Cumulative
for process control 2 Grinding Mill Circuit Description According to the survey by Wei and Craig 2009 ball mills are most common in industrial plants followed closely by FAG and SAG mills A ball mill is usually fed with crushed ore whereas SAG and FAG mills are fed with ROM ore In FAG mills the grinding media consists only

Get Price - Electronic Ear In Sag Mill Automation Control
Aug 25 2004 We have an application in a SAG Mill where we have installed an electronic ear in order to listen the noise produced by the balls falling to the bottom of the mill Our idea is to convert the amplitude and frequency of noise to a 420mA signal or something else in order to determine if the ball is crushing the mineral or the mill lining

Get Price - Publications Smc Testing
Ag And SAG Mill Circuit Selection And Design By Simulation The Decision To Opt For High Pressure Grinding Rolls For The Boddington Expansion An Alternative EnergySize Relationship To That Proposed By Bond For The Design And Optimisation Of Grinding Circuits

Get Price - Optimization Of The Sag Mill Circuit At Kinross Paracatu
The Kinross Paracatu new grinding circ uit consists of one 116 x 67m 38 x 22 SAG mill with installed po wer of 20MW followed by two 73 x 122m 24 x 40 ball mills with

Get Price - Comminution Circuit Optimisation
to grinding inclusive of mining drilling blasting hauling and processing 1 Grinding power alone can account for throughput of the grinding circuit can have economic benefits well beyond the processing plant allowing optimisation of Decreased SAG mill ball diameter Changes to Control and operating philosophy 24 increase in

Get Price - Grinding Mill Modeling And Control Past Present And Future
This paper addresses issues relating to the modeling and control of grinding mill circuits as used in minerals processing with a particular emphasis on semi autogenous grinding or SAG mills SAG mill circuits are generally difficult to control due to the presence of strong external disturbances poor process models and the unavailability of important process variable measurements

Get Price - Grinding Circuit Case Study
The Grinding Circuit Optimization application has been piloted at the Aktogay Plant of JSC AK Altynalmas A Digital Twin of the SAG mill was created which enables improved monitoring performance prediction and optimization to increase profitability

Get Price - An Improved Control Strategy For Ball Mill Grinding
Successful control of SemiAutogenous Grinding SAG mill circuits has been the subject of many researches and main concern of plant operators for years

Get Price - How To Ensure Energy Efficiency In Mining 14 Metso
Dec 04 2018 Therefore a really energy efficient circuit may mean three stages of grinding instead of only two and each stage can be slightly smaller and more efficient than one big one eg a SAG mill or HRC followed by a ball mill and with a tertiary Vertimill These options should at least be considered in the prefeasibility stage to see if the energy

Get Price - Ag Sag Milling Control Kaatsclub Baasrode Va
Ag Sag Milling Controlmayukhportfolio ag sag milling control grinding mill china Conga The world39s first 42foot diameter 28 MW gearless SAG mill failures have not occurred in large GMD SAG mills the

Get Price - Soft Constrained Mpc Applied To An Industrial Cement
MPC for an industrial cement mill grinding circuit and compares the performance of the soft MPC to the existing fuzzy logic controller Conclusions are provided in Section 8 2 Soft MPC Algorithm In this section we describe the Soft MPC algorithm used to control the cement mill grinding circuit Prasath and Jrgensen 2009b

Get Price - A Neural Network Model For Sag Mill Control
achieved via conventional SAG grinding and flotation technology The grinding ball mill circuit The copper concentrate is transported 156 km by pipeline from the mill to the filter and drying plant Dried A Neural Network Model for SAG Mill Control

Get Price - Performance Audit Of A Semiautogenous Grinding Mill Circuit
The audit report will contain contextspecific views on the important measured variables of the SAG mill such that these views reveal interesting events and trends that may form a basis for improving control strategy 21 A grinding mill circuit In the typical grinding mill circuit that deploys a SAG mill the mill is accompanied by a sump and

Get Price - Optimizing Your Sag Mill Operation International Mining
Similar to the impeller design affecting pump capacity the pulp lifter design affects the discharge capacity or mill throughput of AG and SAG grinding mills Generally the discharge from AGSAG mills consists of one or both of the following components slurry water and

Get Price - Sag Mill Optimization Using Model Predictive Control
Control of SemiAutogenous GrindingSAG mill weight is an example of an important process that exhibits many of these aspects Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production Powell MS van der Westhuizen AP Mainza AN 2009

Get Price - Autogenous Grinding Mills Ag Mills Metso
Autogenous mills or AG mills can accomplish the same size reduction work as two or three stages of crushing and screening Often used in grinding at modern mineral processing plants AG mills reduce the material directly to the desired final size or prepare it for the following grinding stages

Get Price - Optimization Of Mill Performance By Using
Optimization of mill performance by using online ball and pulp measurements In the platinum industry by increasing the solid content in the slurry the product becomes finer At a higher percentage solid than 73 to 74 the product becomes coarser again At this level a drop in grinding

Get Price - Simplified Grinding Mill Circuit Models For
Keywords comminution grinding milling modelling model reduction runofmine ore simulation A grinding mill circuit forms a crucial part in the energyintensive comminution process of extracting valuable metals and minerals from mined ore The ability to control the grinding mill circuit is of

Get Price - Modelling Sag Milling Power And Specific Energy
Fig 1 SABC AB milling circuit Scw solid concentration by weight fraction in the SAG mill feed Jb balls charge bulk fraction of the SAG mill volume NNc fraction of the SAG mill critical speed Pc SAG mill power consumption kW 600 100 of the fresh feed in the size range 152 25 mm

Get Price - Optimizing Grinding Circuits Honeywell
Grinding Circuit System Models The Grinding Circuit Simulator has been split into components based largely upon the physical plant figure 1 behavior The c Feed Pumps d Cyclone Model e Control System Figure 1 Grinding Circuit at Cannington This results in

Get Price - Autogenous And Semiautogenous Mills Flsmidth
The mills can be operated in open circuit feeding downstream secondary grinding or operated in closed circuit as single stage mills generating a finer product size Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach

Get Price - Grinding Mill Circuits A Survey Of Control And Economic
1 Introduction Grinding mill circuits are the most energy and cost intensive unit processes in the mineral processing industry and therefore the study of the control systems for grinding circuits remains important Ramasamy et al 2005 Wills and NapierMunn 2006Grinding circuit control objectives range from maintaining system stability to achieving maximum economic benefit

Get Price - Grinding Circuit Improvements At Gold Fields Granny Smith
One of the reasons for their circuit stability is the very fine secondary crushed product size they are sending to their grinding circuit This allowed them to reduce the SAG mill media size and operate at a slower speed without the rock load building and destabilising the mill In turn this provided spare mill capacity which can be used to

Get Price - Control Of Ball Mill Grinding Circuit Using Model
The laboratory grinding circuit consists of an overflow type ball mill 30 cm 30 cm a sump fitted with a variable speed pump and a hydrocyclone classifier 30 mm The schematic diagram of the circuit

Get Price - A Critical Review Of Grinding Design
There are deliberate choices to be made about how much power to put on the SAG mill and how much on the ball mill Measurement and control of the Transfer Size are essential for any design to succeed to its maximum potential When proper control of the Transfer Size is not provided the performance of the grinding circuit cannot be guaranteed

Get Price - Process Diagnostic Studies For Cement Mill
mill liner conditions grinding media charge and product size requirements 42 Working principle Experience over the years has shown that ball mill grinding circuit has a narrow load range in which optimum performance exists Deviating from the optimum load range by under or overloading the grinding circuit

Get Price - Taking Control Of The Mill Feed R2 Orway Mineral
overflow configuration Ball mill discharge slurry gravitates to the feed of the SAG mill discharge screen situated above the mill discharge hopper In 2002 the grinding circuit became SAG mill limited by the competency of the mill feed In consultation with its advisors Orway Mineral Consultants Equigold undertook duplicate circuit

Get Price - White Paper June 2015 Advanced Process Control For
Advanced process control for grinding circuits White paper 3 Introduction Depending on the ore characteristics and the targeted plant capacity the design of the grinding circuit may vary significantly Typically the circuit consists of several mills rod ball SAG AG in series andor parallel with a number of classifiers and

Get Price - Increasing Sag Mill Capacity At The Copper
Copper Mountain first feed to the SAG mill occurred in late May 2011 The circuit began ramp up in midJune of that year with more consistent operating run times on the SAG and Ball mills Plant throughput in the first months was quite variable with throughput tonnage greater than 40000 tons one day and less than 25000 the next on some

Get Price - Expert Mill Control At Anglogold Ashanti
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 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

Get Price - Throughput Optimisation In Milling Circuits
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

Get Price - Pdf Full Precrush To Sag Mills The Case For Changing
grinding mill consists of t wo SAG mills in parallel The product from each SAG mill re ports to the sump and is pumped to the set of Krebs hydrocy clones for classification

Get Price - Supervisory Fuzzy Expert Controller For Sag Mill Grinding
Jan 23 2017 Successful control of SemiAutogenous Grinding SAG mill circuits has been the subject of many researches and main concern of plant operators for years Distributed Control Systems DCS have had some degree of success in the mineral processing circuits but maintaining operation of a SAG mill on the edge of its full capacity is not

Get Price - Quantifying And Improving The Power Efficiency Of Sag
The circuit was performing poorly when originally surveyed It was using considerably more power than would have been expected even for a SAG mill based circuit The factors which were contributing to this were the inappropriate choice of liner material in the SAG mill and the fact that the circuit had been grossly oversized at the design phase

Get Price - Analysis And Validation Of A Runofmine Ore Grinding
2 RunofMine Ore Milling Circuit Description Two types of mills commonly found in the minerals processing industry are ball and semiautogenous SAG mills which use both ore and steel balls as grinding media Wei and Craig 2009b In the case of a ball mill the ore is crushed before it enters the mill whereas a SAG mill re

Get Price - Starkey Associates Inc Leaders In Comminution Design
John Starkey P Eng has worked in SAG mill hardness testing since 1964 where he worked as pilot plant engineer for A MacPhersons projects He invented the SPI and SAGDesign tests The latter is now acknowledged by our clients to be a worldclass method for grinding circuit design and is accepted by our peers as a standard for ore

Get Price - 20150821 Morrell Methodgmgicev01r01 Morrell
Autogenous Grinding AG Ball mill Bond Work Index Wi Comminution circuit High Pressure Grinding Rolls HPGRs Rod mill SemiAutogenous Grinding SAG Specific energy W 4 INTRODUCTION AND BACKGROUND The Morrell method for predicting the specific energy consumption of conventional crushing High Pressure Grinding Rolls HPGRs and

Get Price - Improvements In Sag Mill Throughput From
Ahafo Grinding Circuit Ahafo operate a 54 x 75 in gyratory crusher for primary ore and a toothed MMD sizer for oxide ore This is followed by an SABC circuit comprising a 34 x 164 ft 13 MW semi autogenous grinding SAG mill in closed circuit with two 600 kW pebble crushers SAG milling is followed by a 24 x 39 ft 13

Get Price - An Overview Of The Design Construction
During the study in early 2005 the circuit throughput was set at 9 Mtpa and the key grinding circuit design parameters were as shown in Table 1 Table 1 Initial Grinding Circuit Key Design Parameters SAG Mill Feed Size F100 235mm Feed Size F80 115mm Ore SG 29 Required Mill Discharge Size P80 2000 micron Ball Charge 10 to 18 Total Charge 26

Get Price - Development Of A Control System For A Sagbc Grinding Circuit
A comprehensive automatic control system has been developed and implemented for the twostage grinding circuit at the Paddys Flat gold plant of Dominion Mining Ltd at Meekatharra in Western Australia The circuit comprises a SAG mill in closed circuit with a pebble crusher followed by a ball mill cyclone secondary circuit

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