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Dynamic modeling and simulation of a SAG mill-pebble ...

01-10-2018  In this circuit, two SAG mills have the same throughput, feed rate and the recycling load. Below all the simulation results are from SAG mill 1. The first graph shows that the throughput of the SAG mills is affected by the pebble crusher settings.

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Dynamic modeling and simulation of a SAG mill-pebble ...

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 mill-pebble crusher circuit was implemented.

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Pebble Crushing in SAG Mill Circuit - 911 Metallurgist

A vibrating screen was used to provide a mill discharge product separation at 19 mm (¾ in.). The minus 76 trail (-3 in.) plus 19 mm (+¾ in.) screen oversize product, which are the “pebbles”, were then crushed to essentially 100% minus 19 mm (-¾ in.) in a crushing circuit. This product was returned to the feed end of the mill.

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Dynamic Modeling and Simulation of SAG Mill Circuits with ...

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 the

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SAG Mill Pebble Crushing - en.trituradoras-de-roca

SAG Mill Pebble Crushing Further size reduction of the pebble fraction in an SABC (semiautogenous-ball-crusher) circuit can be achieved by passing the pebble crusher product through an HPGR, thus increasing circuit capacity.

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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 bin.

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DYNAMIC MODELLING OF A SAG MILL-PEBBLE CRUSHER

In a semi-autogenous grinding (SAG) mill and pebble crusher circuit, the behaviour of the comminution process is non-linear and time-varying due to wear and variations in the feed material. To describe such a complex system, data-driven models were introduced, along with a case study of a SAG mill circuit in Copper Mountain, British Columbia, Canada.

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Dynamic modeling and simulation of a SAG mill-pebble ...

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 mill-pebble crusher circuit was implemented.

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Dynamic Modeling and Simulation of SAG Mill Circuits

Therefore, cone crushers are often used as pebble crushers and integrated into AG/SAG mill circuits to break the critical size particles that accumulate in the mill and to increase the performance of the primary grinding circuits. Many studies have been carried out, mainly focusing on optimizing of SAG mills and cone crushers, respectively, but only a few have investigated the dynamic ...

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DYNAMIC MODELLING OF A SAG MILL-PEBBLE CRUSHER

In a semi-autogenous grinding (SAG) mill and pebble crusher circuit, the behaviour of the comminution process is non-linear and time-varying due to wear and variations in the feed material. To describe such a complex system, data-driven models were introduced, along with a case study of a SAG mill circuit in Copper Mountain, British Columbia, Canada.

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SAG Mill Grinding Circuit Design - 911metallurgist

06-06-2016  However, open circuiting the SAG mill by feeding crushed pebbles directly to a ball-mill circuit is often considered as a technique to increase SAG throughput. An option to do both can allow balancing the primary and secondary milling sections by having the ability to return crushed pebbles to SAG feed as per a conventional flowsheet, or to the SAG discharge.

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INCREASING SAG MILL CAPACITY AT THE COPPER MOUNTAIN

20’ EGL SAG mill, a Raptor 900 pebble crusher and two 24’ x 39’6” ball mills. Each mill is equipped with a 2 x 8500HP dual pinion drive system. The plant was designed to process 1585 h mtpof SAG feed. From startup, the mill struggled to meet the required production rates. Over time, a

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Optimizing Performance of SABC Comminution Circuit of the ...

02-12-2016  the SAG mill and ball mill was 8658 kW, which caused partial over-grinding. From experience in processing plants outside of China, the power rating of the ball mill should be higher than that of the SAG mill [5]. The pebble crusher had an over

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What's the Difference Between SAG Mill and Ball Mill ...

26-11-2019  The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill’s ...

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INVESTIGATION OF SORTING TECHNOLOGY TO REMOVE

In addition to the mill volume reduction, the critical size material is harder than the normal material and this contributes to additional power draw. In order to overcome the effects of pebbles in the circuit, it is common to install pebble crushers in an AG/SAG circuit. This has increased the AG/SAG mills capacity in some cases by up to 25% ...

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Design of the 40 foot SAG Mill Installed at the Cadia Gold ...

SAG mill and two ball mills in closed circuit with cyclones. Two pebble crushers treat the SAG mill discharge trommel screen oversize material. The crushed product is combined with the SAG mill feed. Project economics dictated maximum throughput through a single line comminution circuit. Hence the selection of some of the largest

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USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE

For tumbling mills the 2 indices relate to “coarse” and “fine” ore properties plus an 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 ...

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Freeing up milling capacity in a SAG mill ball mill ...

08-07-2016  The harder component of the SAG mill feed from the primary crusher, that component with a higher bond work index, will be over represented in the pebble circuit (relative to the mill feed). In many cases the low grade or barren gangue component

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Design of the 40 foot SAG Mill Installed at the Cadia Gold ...

SAG mill and two ball mills in closed circuit with cyclones. Two pebble crushers treat the SAG mill discharge trommel screen oversize material. The crushed product is combined with the SAG mill feed. Project economics dictated maximum throughput through a single line comminution circuit. Hence the selection of some of the largest

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Magnetic Separation Techniques to Improve Grinding Circuit ...

• 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 by

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AG/SAG Mill Circuit Grinding Energy Requirement - How to ...

were conducted with a pebble crusher in circuit whilst the SAG mill runs were not. The data indicate that the worst condition (highest specific energy) is when about 4% of steel balls are used. When the Bond operating work indices are calculated a very different picture is obtained as shown in Figure 2.

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What's the Difference Between SAG Mill and Ball Mill ...

26-11-2019  The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill’s ...

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SAGDesign Test Starkey and Associates Inc.

Typically, Starkey Associates recommends SAG mill circuits followed by a ball mill(s) working in series with the SAG mill. The quantity of mills or pebble crushers recommended is dependent upon the ore hardness, design plant throughput, and final product size desired for ideal liberation.

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Modelling SAG milling power and specific energy ...

Pebble Crusher Screen Cyclones Sump Pump Fig. 1. SABC A/B milling circuit. Scw = solid concentration by weight fraction in the SAG mill feed; Jb = balls charge (bulk fraction of the SAG mill volume); N/Nc = 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.

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What is the difference between a SAG mill and ball mill?

SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a

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USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE

For tumbling mills the 2 indices relate to “coarse” and “fine” ore properties plus an 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 ...

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COMMISSIONING OF THE 375ktpm AUTOGENOUS MILLING

acoustic device (SAG analyser). The mill is equipped with 70mm pebble ports and discharges onto a 30mm trommel screen. The +30mm trommel oversize is delivered onto a conveyor supplying pebbles to the secondary mill pebble feed bin. When this bin is full, the pebbles will be routed to the pebble crushers via an overflow chute on the pebble bin.

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Freeing up milling capacity in a SAG mill ball mill ...

08-07-2016  The harder component of the SAG mill feed from the primary crusher, that component with a higher bond work index, will be over represented in the pebble circuit (relative to the mill feed). In many cases the low grade or barren gangue component

MoreOnline Chat

Magnetic Separation Techniques to Improve Grinding Circuit ...

• 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 by

MoreOnline Chat

What's the Difference Between SAG Mill and Ball Mill ...

26-11-2019  The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill’s ...

MoreOnline Chat

AG/SAG Mill Circuit Grinding Energy Requirement - How to ...

were conducted with a pebble crusher in circuit whilst the SAG mill runs were not. The data indicate that the worst condition (highest specific energy) is when about 4% of steel balls are used. When the Bond operating work indices are calculated a very different picture is obtained as shown in Figure 2.

MoreOnline Chat

SAGDesign Test Starkey and Associates Inc.

Typically, Starkey Associates recommends SAG mill circuits followed by a ball mill(s) working in series with the SAG mill. The quantity of mills or pebble crushers recommended is dependent upon the ore hardness, design plant throughput, and final product size desired for ideal liberation.

MoreOnline Chat

Operation Analysis of a SAG Mill under Different ...

09-10-2020  in the semi-autogenous grinding process by dynamically modeling the SAG mill-pebble crusher loop to improve the SAG mill throughput. Cleary [8–10] studied the e ect of rock particle shape on the dynamic filling and energy utilization in a SAG mill and analyzed the operation status of a SAG mill under di erent collision conditions through the ...

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Modelling SAG milling power and specific energy ...

Pebble Crusher Screen Cyclones Sump Pump Fig. 1. SABC A/B milling circuit. Scw = solid concentration by weight fraction in the SAG mill feed; Jb = balls charge (bulk fraction of the SAG mill volume); N/Nc = 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.

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Taking Control of the Mill Feed R2 - Orway

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 2.

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What is the difference between a SAG mill and ball mill?

SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a

MoreOnline Chat

USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE

For tumbling mills the 2 indices relate to “coarse” and “fine” ore properties plus an 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 ...

MoreOnline Chat

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