THE VALUE OF RIGOROUS SURVEYS THE LOS BRONCES
A large part of SAG 2 sump slurry is pumped to ball mill 3. plex transfer arrangement is set up to allow the workload to be shifted around the circuit, and especially to ball mill 3.
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Goulds SRL
External oil level sight gauges on both sides Shaft Sleeve Hard Ni Cr coated XH 800 alloy sleeve 64 Rockwell C coating will not chip or crack Ground 6 8 RMS surface finish 316 SS base alloy for corrosion resistance Special alloys available Bearing Cartridge Assembly XH 800 Shaft Sleeves Optional Natural Rubber CRM Wearplate for 10� SRL XT Suction Wearplate Liner
Modification of SAG mill liner shape based on 3 D liner
16/05/2009· The discharge of the SAG mill goes to a vibrating screen with the openings of 5 mm. The oversize material is recycled to the SAG mill and the undersizebined with the ball mill 6.71 × 9.91 m discharge and is sent to the cyclones. The SAG mill uses two 5500 hp synchronous motors and works with constant 10.5 rpm rotational speed in two directions. Some important characteristics of this
Outotec® MH Series Grinding Mills Outotec
Outotec® MH Series Grinding Mills offer a cost effective, and easy to operate and maintain grinding solution across the mill lifecycle. The MH Series includes a range of SAG, ball, and rod mills in standardized sizes with a capacity of up to 3.1 MW installed power, and is based on over 100 years of experience with grinding technologies.
Ball Mill Critical Speed Working Principle
19/06/2015· The tendency of the charge to slip back along the rising side of the shell is reduced as charge level increases, until reaching between 30 to 40 percent of mill volume in one particular test mill
Outotec® MH Series Grinding Mills Outotec
Outotec® MH Series Grinding Mills offer a cost effective, and easy to operate and maintain grinding solution across the mill lifecycle. The MH Series includes a range of SAG, ball, and rod mills in standardized sizes with a capacity of up to 3.1 MW installed power, and is based on over 100 years of experience with grinding technologies.
Grinding Mill an overview ScienceDirect Topics
Mill discharge arrangement. If the SAG and ball mills feed separate pump systems this is not an issue. If the two stages feed the same pump system, the SAG mill usually drives the discharge arrangement. This is because the SAG mill is usually of larger diameter and may have a requirement for screening of pebbles to protect the mill discharge pumps and cyclones, and to facilitate pebble
EXPERT SYSTEMS IMPLEMENTATION AT PEÑOLES GROUP
feed and the particle size measurement of the cyclone overflow. SAG/BM CIRCUIT. Flowsheets of the second grinding circuit are shown in figures 2 and 3, also . indicating control loops and installed instrumentation. The overall SAG/BM circuit consists of a SAG milling circuit, followed by a . secondary and tertiary grinding stage utilizing two ball mills. The SAG/Ball Mill Circuit has an
The Art and Science of Operator Less, Plant Floor, Rougher
Two flotation cells and a discharge box constitute the flotation bank shown in Figure 2. Rougher flotation circuits are often configured with multiple stages of flotation banks containing various flotation cells to provide the required retention time for flotation. Each bank will have instrumentation and controls similar to that shown in Figure 2. The item labeled LE represents the level
Resources Control Southern
Solids Level Measurement Smart Meter Verification Ore Receiving Back. Conveying Reliability/Machinery Health Bulk Flow Measurement SAG Mill SAG temperature measurement Semi Autogenius Grinding SAG Mill Back. Cyclone Control Expert Cyclone Control Cyclone Control Back. Acid Plant Emissions Analysis
RESPONSE OF PRIMARY GRINDING MILL PERFORMANCE TO
operating conditions of a SAG mill and how the vibration response and hence mill operating conditions vary as a function of time, including during mill equipment failures such as a broken discharge grate. Opportunities for improved mill control based on the data from the on line monitor are also discussed, as well as the implications in terms of mill processing and
The Art and Science of Operator Less, Plant Floor, Rougher
Two flotation cells and a discharge box constitute the flotation bank shown in Figure 2. Rougher flotation circuits are often configured with multiple stages of flotation banks containing various flotation cells to provide the required retention time for flotation. Each bank will have instrumentation and controls similar to that shown in Figure 2. The item labeled LE represents the level
Optimum SAG Mill Discharge Density Grinding
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 aplete input. Usement = to
Inferential Measurements for SAG Mills
The development of inferential measurement models of SAG mill total charge and ball charge levels, feed rate and size distribution, and, mill discharge rate and size distribution and the further developmentbined state and parameter estimation for SAG mills are the objectives of this research. Consultation with industry and a review of developments in this area found
SWS SAG Mill and Discharge Feeder
Originally designed to measure wear in coatings within SAG mills, the Smart Wear Sensor SWS
KnowledgeScape
The throughput and efficiency of a SAG mill depends on the volumetric load: An overloaded mill has reduced coarse ore breakage, as the cascading balls and rock cannot drop far enough, reducingic energy for breakage. An underloaded mill will break coarse ore well, but at the expense of added grinding ball consumption and increased risk of liner damage. Also, if underloaded, significant
Outotec® Open Ended Discharge Grinding Mill Outotec
Optimized discharge end serviceability is particularly important for an open ended mill as the grate design is the primary mechanism to control the slurry pool level. Therefore, the ability to easily iterate grate configurations is imperative for process performance optimization, especially during early operation or when there are significant changes in process or feed characteristics.
Cyclones Resource Book
The purpose of the cyclones in the circuit is to size the mill discharge slurry. Two product streams are generated by the cyclones A fine overflow stream which reports to the leach/adsorption tanks. A coarse underflow stream that is recirculated to the mills for further grinding. The most important aspect of cyclone operation is that the particles in the overflow stream
Improved Relationships for Discharge in SAG/AG Mills
There is currently no accepted pilot test procedure for measuring discharge and product size distributions in AG/SAG mills. The existing models and understanding of grate discharge and classification are known to be flawed and have been identified as one of the key limitations in AG/SAG modelling.
Grinding control strategy on the conventional milling
The rod mill discharge is pumped, without any further water addition, to the first ball mill. The ball mill discharges to a sump where water is added before the slurry is pumped to the first cyclone Cylcone 1. See Figure 1 for a schematic of the process flow. The slurry stream is classified at Cyclone 1 with the overflow going to the flotation circuit. Cyclone 1 underflow constitutes the
Improving Energy Efficiency Via Optimized Charge Motion
Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size. Considering a typical mining operation processes 10,000 to 100,000 tons per day the energy
SAG Mill Liner Design Mineral Processing Metallurgy
Since AG/SAG mill volume is roughly proportional to the mill radius cubed at typical mill lengths while the available cross sectional area grows only as the radius squared, pulp lifters muste more efficient at transferring slurry in larger mills. Mills with pebble crushing circuits will require grates with larger apertures to feed the circuit. No discussion of SAG milling would
Streamlining the Steps to Optimized Production: Project
Investigation Report SAG Mill 20110414 An investigation into the SAG Mills peak on the 40 to 70 open for both the Intermediate and Discharge Box dart valves. Investigation Report Ball Mill Limiting 20110929 Illustrates the dynamic behavio ur of theminution circuit for different ore types and transitions. This report alsoparison between alternative control
PDFparison of wear rates of ball mill grinding media
SAG mill balls experience bot h pulp level, mill size and speed . and throughput are intrinsic fac tors, while . J o u r n a l o f . M i n i n g a n d . M e t a l l u r g y . 2 A. Jankovic et
EXPERT SYSTEMS IMPLEMENTATION AT PEÑOLES GROUP
feed and the particle size measurement of the cyclone overflow. SAG/BM CIRCUIT. Flowsheets of the second grinding circuit are shown in figures 2 and 3, also . indicating control loops and installed instrumentation. The overall SAG/BM circuit consists of a SAG milling circuit, followed by a . secondary and tertiary grinding stage utilizing two ball mills. The SAG/Ball Mill Circuit has an
Commissioning and Optimisation of the Phu Kham Copper Gold
SAG mill is fitted with a dual pinion drive 6.5 MW per pinion and is driven by a variable speedprised of a SER/Hyper synchronous drive. The 24 ft × 39 ft 13 MW ball mill is driven by dual, 6.5 MW wound rotor motors through reduction boxes and gear and pinion drives. The SAG mill discharge is screened on a rotating trommel screen. Trommel undersize discharges into a sump where it
Inferential measurement of SAG mill parameters ScienceDirect
01/06/2001· Semi autogenous SAG mill total load and ball load have a marked influence on mill performance. Direct measurement of these inventories is difficult, hence inferential measurement is an attractive option to open the way to their control.
Paper # 25 Copper Mountain Overview on the Grinding
It is a grate discharge mill with an inside diameter of 10363 mm and a grinding length of 5334 mm . The mill is driven by two 8,500 horsepower ABB motors. Figure 2 The 34 x 20 SAG mill . 4 Table 1 includes the technical data for the Copper Mountain SAG mill. Table 1 general SAG mill data Specification Data Mill size 10.363 M diameter by 6.096 M 20 feet
SAG MILL DISCHARGE SCREENS TROMMEL vs. VIBRATING Tony
SAG MILL DISCHARGE SCREENS TROMMEL vs. VIBRATING Tony Moon, RTZ What Id like to talk about is probably one of the nastiest bits of mill design for a grinding circuit, and that is the choice of what do you use on a SAG mill discharge? Do you use vibrating screens or trommel screens? What many of you probably dont realize is that at Kennecotts Copperton
Streamlining the Steps to Optimized Production: Project
Investigation Report SAG Mill 20110414 An investigation into the SAG Mills peak on the 40 to 70 open for both the Intermediate and Discharge Box dart valves. Investigation Report Ball Mill Limiting 20110929 Illustrates the dynamic behavio ur of theminution circuit for different ore types and transitions. This report alsoparison between alternative control
Instrowest Case Studies
The weightometer was mounted on the discharge conveyor from an underground. Read More Download pdf. 5. OPS Crushing Screening Siemens/Tecweigh Installation. Instrowest was recently approached by OPS Crushing and Screening to assist them with procuring, installingmissioning a belt weigher for a mobile stacker application for one of their clients in the Pilbara. Read More
Manuel González Fernández Provincia de Santiago, Chile
To be included in a simulator, the model must also predict the overall size distribution of the SAG mill discharge. Assumptions to answer this point are presented here. The model has been implemented in the USIM PAC simulator. It is used either to predict the product size distribution for a given SAG mill, but also to size a SAG mill for getting a required reduction ratio.
ball filling percentage for sag mill
Optimum SAG Mill Discharge DensityGrinding . Relation between Sag mill solid and product P80 Both are dependent on feed size. Dependent on Volume solids in SAG mill. Dependent on ball charge volume. Hardness of ore. Recirculation load. Dependent on P80 size. All other parameters are secondary. In general Sag mill solids are kept at 70 by wt. Operating grinding
Ball Mill Maintenance Installation Procedure
Metallurgical ContentBall Mill Maintenance ManualOn Mill Installation and MaintenanceBall Mill Concrete FoundationsGrinding Mill FOUNDATIONGROUTINGBall Mill Sole Plate Am sure your Ball Mill is considered the finest possible grinding mill available. As such you will find it is designed and constructed according to heavy duty specifications. It is designed along sound engineering principles
A field mill for measuring atmospheric electricity
Thus, the field mill gives the earths electric field as 120 䔸 Vm^ 1 as the covered reading of approximately 50 mV is subtracted from the uncovered reading of 170 mV. Further measurements were made with the field mill on 22 June 2017. A thunderstorm had been forecast so there was a possibility of variability in the earths electric field.
Instrowest Case Studies
The weightometer was mounted on the discharge conveyor from an underground. Read More Download pdf. 5. OPS Crushing Screening Siemens/Tecweigh Installation. Instrowest was recently approached by OPS Crushing and Screening to assist them with procuring, installingmissioning a belt weigher for a mobile stacker application for one of their clients in the Pilbara. Read More
AUTOMATION ADVANCED CONTROL EXPERT ACE
Manage the ball mill sump level Automatically rotate cyclones in service to prevent premature wear Protect the ball mill sump pump from overload Improve classification BALL MILL CASE STUDIES Location: Collahuasi Mine Variability of the operating pressure of hydrocyclones reduced by 52.4 P80 variability decreased by 39.2 Copper recovery variability decreased by 36
SM at Kennecott Utah Copper Introduction
one SAG mill feeding two ball mills in a closed circuit with a hydrocyclone battery Figure 1. The aim of the ball mill/ hydrocyclone circuit is to produce the optimum flotation feed particle size while maintaining grind throughput. The optimal operating point is a trade off between throughput, recovery, and grinding cost. Copperton has
Grinding mills for mining and minerals processing Xinhai
Every mining operation has a unique grinding process. Xinhai has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our expertse the opportunity to assist you with circuit and circuit control design as well as start up, operation, and optimization of your mill.
Lihir Gold Limited Process Plant Flowsheet
SAG Mill Feed Conveyor Radial Stacker Front End Loader Crushed Ore Transfer Conveyor Crusher Discharge Conveyor R.O.M. Stockfile Hard Ore Soft Ore Hard Ore Dump Hopper Front End Loader Carbon Screen Conditioning Tanks Mill Water Pumps 3x To Neutralisation Tank Flotation Tank Cells 5 x Rougher Tailings Hopper Flot. Rougher Tailings Milk of