pebble crusher sag mill
2019-01-17T07:01:22+00:00
Pebble Crushing in SAG Mill Circuit
Full Scale Test Circuit Based upon the results of the pilot plant test work, a decision was made to conduct a full scale test in 1990 utilizing one of the ten (10) primary mill lines at the National Steel Pellet Plant Primary Mill Line No 10 would be converted to a fully autogenous grinding mill The hypothesis put forward in this paper is that active control of the cone crusher’s eccentric speed and closed side setting (CSS) can increase throughput and/or energy efficiency of the SAG circuit To verify this hypothesis, a dynamic model of a SAG millpebble crusher circuit was implementedDynamic modeling and simulation of a SAG millpebble SAG mill and its pebble crushers The scope of this thesis is to examine the dynamic relations between the SAG mill and the pebble crusher in a closed circuit and thus to optimize the circuit efficiency by controlling the pebble crusher operational settings In this thesis, two modeling techniques are proposed for simulating the dynamics in theDynamic Modeling and Simulation of SAG Mill Circuits
SAG mill and Pebble mill Grinding Classification
SAG mill there will be either steel balls or harder ore as grinding media There may not be any cone crusher for grinding the vibrating screen oversize and the same is recirculated back to SAG If the mine has also harder ore and majority softer ore, the harder ore may be utilised as grinding media after size reduction with necessary intermediate binIn a semiautogenous grinding (SAG) mill and pebble crusher circuit, the behaviour of the comminution process is nonlinear and timevarying due to wear and variations in the feed material To describe such a complex system, datadriven models were introduced, along with a case study of a SAG mill circuit in Copper Mountain, British Columbia, CanadaDYNAMIC MODELLING OF A SAG MILLPEBBLE CRUSHER CIRCUIT b) Semi autogenous grinding in which the pebble fraction of mill discharge (+½ in) is taken out through pebble ports for separate crushing and ball milling The minus ½ in fraction of mill discharge is recycled to the SAG mill Crushing SAG Mill Critical Size Material
grinding with AG mill + pebble crusher and ball mill
But you can't use pebble crushers in SAG circuits because the iron ore and steel balls will confuse the crusher tramp steel protection Either fully autogenous with or without pebble crusher, or SAG without pebble crushing are valid Note that Bond rod mill work index is determined in an apparatus with a wave linerHalyard designed and installed a 100TPH pebble crusher for the 9,000TPD SAG Mill Circuit This system also has the provision for accepting pebble feed from a large historic stockpile and proportionally augmenting this with the SAG discharge The HP200 operates on a Variable Speed Drive to account for varying feed conditionsAlamos Gold Inc – Pebble Crushing Plant Halyard Inc • Pebble Crusher • SAG Mill Vibrating Screen Oversize • Ball Mill Discharge Technique/Equipment Solution − Suspended Electromagnet − Suspended Magnetic Drum − Trunnion Magnet Pebble Crusher Figures 3 and 4 shows the location of a suspended electromagnet over a pebble crusher conveyor Fig 1 Cone Crusher Mantle damaged byMagnetic Separation Techniques to Improve Grinding
USING THE SMC TEST® TO PREDICT COMMINUTION
efficiency factor which represents the influence of a pebble crusher in AG/SAG mill circuits “Coarse” in this case is defined as spanning the size range from a P80 of 750 microns up to the P80 of the product of the last stage of crushing or HPGR size reduction prior to grindingHalyard designed and installed a 100TPH pebble crusher for the 9,000TPD SAG Mill Circuit This system also has the provision for accepting pebble feed from a large historic stockpile and proportionally augmenting this with the SAG discharge The HP200 operates on a Variable Speed Drive to account for varying feed conditionsAlamos Gold Inc – Pebble Crushing Plant Halyard Inc Conventionally, crusher product was returned to SAG feed Some designs, however, now allow pebblecrusher product to be returned to the SAG screens/discharge (allowing operation of the pebble crusher in closed circuit) or even to the ballmill circuit There is no ‘right’ answer for where the crusher product should be put 100% of the timeGold plant pebble crushing Henan Deya Machinery
Taking Control of the Mill Feed R2 orwayau
Ball mill discharge combined with SAG mill discharge to form the feed to the screen (See Figure 1) Screen oversize pebbles were conveyed to a recycle crusher, where they were crushed and returned to the SAG mill feed conveyor A 736 Allis Chalmers pebble crusher (110 kW) performed this duty A Process Flow Diagram is presented in Figure 2Mill consistent with survey #2 exhibiting a finer SAG mill product (smaller throughput with a pebble crusher running would have been between 631 transfer size) to the ball milling circuit than survey #1 (See Figure 6) and 935 dmtph for the feed size distribution achieved by this blast design(PDF) Maximising SAG mill throughput at Porgera efficiency factor which represents the influence of a pebble crusher in AG/SAG mill circuits “Coarse” in this case is defined as spanning the size range from a P80 of 750 microns up to the P80 of the product of the last stage of crushing or HPGR size reduction prior to grindingUSING THE SMC TEST® TO PREDICT COMMINUTION
How to choose the correct pebble crusher for your site
The smaller the crush size, the more rapidly the pebble load will be reduced, so we recommend using a heavy, robust crusher, such as the Trio® TC series, to achieve higher throughput rates in the milling circuit * McIvor, R Greenwood, B (1996) Pebble Use and Treatment at ClevelandCliffs’ Autogenous Mill Operations SAG with pebble crushing circuit: Morrell, 2004 SAG with pebble crushing circuit: Morrell, 2004 Circuits with a pebble crusher have an extra term to account for the pebble crusher specific energy, which requires an estimate of the pebble crusher F 80 (PEB, the size of the pebbles as µm) and the pebble crusher product P 80 (approximately the Model:Morrell SS SAG Morrell Mi (SMC) SAG ball mill Model This is a SAG or AG mill plus ball mill model that estimates the specific energy consumption (E SAG) using the equations of Morrell (2004) The quantity of material passing through the pebble crusher is also required, expressed as a fraction of the fresh feed rate to the SAG circuit Pebble crushers Model:Morrell Mi SMC SAG
Optimise your pebble crushing with HPGR globalweir
Whether recirculated through primary milling or separated and sent to a dedicated downstream pebble mill, pebble crushing is an energyintensive operation that ties up a site’s limited resources With their high throughput and capacity for dealing with competent ores, High Pressure Grinding Rolls (HPGR) make ideal pebble crushers a pebble crusher and is returned back to the SAG mill Trommel undersize is pumped from the mill sump to the cyclone cluster for classification The coarse undersize exiting the cyclone is returned to a single 6 MW, secondary ball mill operating in closed circuit The pulp discharging thePITTOPLANT OPTIMISATION AT MORILA GOLD MINEThe SAG circuit was built without a pebble crusher and the mill was rejecting approximately 50T/hour of ungrindable pebbles Over 5 years, 650,000 tonnes of gold bearing pebbles had been milled, rejected and stockpiled The objective was to crush the existing 50t/hour pebble stream and to reprocess the 650kT pebble stockpileAlamos Gold Inc, YoungDavidson Mine: Pebble
Gold plant pebble crushing Henan Deya Machinery
Conventionally, crusher product was returned to SAG feed Some designs, however, now allow pebblecrusher product to be returned to the SAG screens/discharge (allowing operation of the pebble crusher in closed circuit) or even to the ballmill circuit There is no ‘right’ answer for where the crusher product should be put 100% of the timeMill consistent with survey #2 exhibiting a finer SAG mill product (smaller throughput with a pebble crusher running would have been between 631 transfer size) to the ball milling circuit than survey #1 (See Figure 6) and 935 dmtph for the feed size distribution achieved by this blast design(PDF) Maximising SAG mill throughput at Porgera The third major improvement during the reporting period was the opening of a pebble crusher circuit in the SAG mill An operational alternative was proposed to enhance the circuit flexibility and improve the energy balance between the ball milling and the SAG milling It created an option to transfer the output from the pebble crusher SOSSEGO SAG MILL 10 YEARS OF OPERATION AND
Model:Bond/Barratt SABC Models
The pebble crusher is assumed to be part of the SAG mill for the purposes of this calculation E peb is calculated as the power drawn by the pebble crusher divided by the circuit throughput This E peb is then deducted from E sag The total circuit specific energy consumption is generally higher when no pebble crusher is present in a circuit SAG mill (4% ball charge, 90% Nc) A cross between AG and SAG for average competency, abrasive ores Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground), Kloof, Jacobina 6 SAG mill with recycle crusher (8 – 15% ball charge) Competent ores, better suited to coarse grind sizes High aspect mills are recommended to SINGLE STAGE SAG/AG MILLING DESIGN orwayau the pebble crusher feed bins via the pebble crusher feed conveyor The 4mm material flows into the common mill discharge sump 322 Pebble Crushing Circuit Pebbles from the secondary mill pebble feed bin are withdrawn at a controlled rate by a belt feeder and delivered to the secondary mill via a pebble transfer conveyor The rateCOMMISSIONING OF THE 375ktpm AUTOGENOUS
PITTOPLANT OPTIMISATION AT MORILA GOLD MINE
a pebble crusher and is returned back to the SAG mill Trommel undersize is pumped from the mill sump to the cyclone cluster for classification The coarse undersize exiting the cyclone is returned to a single 6 MW, secondary ball mill operating in closed circuit The pulp discharging theStage Deposit Type Mining Method Processing Technology HME Type HME Model Crusher / Mill Type Crusher / Mill Model Job Category Job Title Contact Name result: 565 assetsCrushers Mills Mining Data Online global website global website