Batu Hijau is an openpit coppergold mine located on the island of Sumbawa in the province of West Nusa Tenggara, about 1,500 kilometres east of Jakarta. It is the second largest copper and gold mine in Indonesia and has produced more than 8 billion pounds of copper and over 8½ million troy ounces of gold since production commenced in 2000.
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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% for an iron ore operation (McIvor Greenwood, 1996). However, the beneficial gain from crushing critical size
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A pebble crusher is the way to go for a greenfields project. SAG mill grates generally limit pebble extraction rates to around 25%, so you can't expect a throughput increase of more than 510% depending on the ore.
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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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This scenario for the SAG mill is taken from a design criteria. P80 for the SAG is 2 inch (this p80 considers SAG discharge only). If we consider the SAG screen and pebble crusher then SAG CIRCUIT p80 = 7mm. Ball Mills: 2 Ball Mill speed: 75% of critical speed. Ball mill size: 27 x 45 ft
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Until recently, AG mill and SAG mill circuits were invariably designed in closed circuit. with the screen and pebble crusher, with the screen oversize portion being crushed and. completely recycled to the mill feed. Recently, however, some SABC installations have. been operated in open circuit by having the screened crusher product report to ...
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A pebble crusher is the way to go for a greenfields project. SAG mill grates generally limit pebble extraction rates to around 25%, so you can't expect a throughput increase of more than 510% depending on the ore. To pebble crush, you need to port the grate. This removes any fine media, so achieving a fine grind size in a single stage becomes ...
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MEI Blog: Where are SAG mills going? Barry A. Wills Aug 25, 2014 · Interesting, as in a recent article in Mining Magazine (July/August 2014, pp. 27), Kurt O'Bryan of Minerals says that, although SAG mills have been around for over 40 years, the demand to process more ore in less time is a key factor in where comminution trends are heading.
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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 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
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A large SAG installation (with pebble crusher product combining with SAG discharge and feeding screens) is depicted in Figure, with the corresponding process flowsheet presented in Figure Download : Download fullsize image; Figure Large SAG installation (, 38ft diameter, 20MW gearless drive).
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Wireless Sensors Used to Determine Operational Variables in Grinding. PreCrushing of SAG Feed: Friend or Foe, Starkey, Reeves, Senchenko Discharge on the Overall Circuit Performance, Phiri, Ngosa, Chongo, Asset Health Analytics of a Gearless Mill Drive, Tischler. Mills, Duarte, Martínez, Castillo, Mascaró. 11:00 Scagliotta, Heath.
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mill Higher maintenance with grate d/c mill Variation in ore competency an issue Current benchmark Pebble crushing impacts on SAG mill operation AG/PC circuits require good control systems Suitable Pebble management an issue. Requires complex circuit Applicability Low throughput <100 t/h Suitable for moderate capacity circuits Alternative to
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The Isua iron ore project is located in Greenland, approximately 150km northeast of Nuuk. ... (SAG) mill circuit will be equipped with a pebble crusher to achieve maximum mill throughput. The product sized over 8mm will be sent to pebble crusher before being returned to the SAG mill feed. The medium sized products (between 2mm to 8mm) will be ...
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Semiautogenous mill with pebble crusher followed by ball mill SABC 47 Bueno and Lane (2011) also calculated a simplifi ed operating cost for each trial, considering only the energy and grinding ...
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Semiautogenous (SAG) mills are widely used grinding equipment, but some ore with critical particle sizes cannot be effectively processed by SAG mills and turned into pebbles. This research aims to analyze and compare the properties of raw ore and pebbles from a zinc and tinbearing ore. The results show that the contents of sphalerite, cassiterite, biotite, antigorite, pyroxferroite ...
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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 ... the pebble crusher feed rate. Monzonite Bond ball mill work indices (Wi) averaged /t, with a maximum variation of ±9%. The inferred average ...
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Abstract: Semi‐autogenous (SAG) mills are widely used grinding equipment, but some ore with critical particle sizes cannot be effectively processed by SAG mills and turned into pebbles. This research aims to analyze and compare the properties of raw ore and pebbles from a zinc‐ and tin‐
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The stockpiled ore will be fed to a conventional semiautogenous (SAG)ballpebble crusher (SABC) system. The discharge from the SAG mill will be sent to a double deck vibrating screen to remove pebbles of over 1in, which will be recirculated to two shorthead cone pebble crushers. The product from the pebble crusher will be sent back to the SAG ...
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Based on the crusher model developed by Asbjörnsson et al., 2012, Li et al., 2018 proposed a dynamic model of a SAG millpebble crusher circuit. Methods based on test works to estimate power draw are also worth mentioning due to their frequent applications in commercial simulation platforms.
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Ball mill discharge pump box Apron feeder Apron feeders Preleech Gravity thickener separators Gravity tailings pump box Induction furnace Kiln Stacker SAG mill To waste dump Vibrating feeder Pebble crusher Pebble crusher ore bin Loaded carbon screen Carbon sizing screen Conveyor MULTIBELT® belt weigher Conveyor MULTIBELT® belt weigher GOLD ...
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from the primary pebble mill is much finer than what can be ... as tertiary crusher or primary mill because of low ... rolls in an autogenous Pebble milling circuit, in Proceedings SAG 2001 ...
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SAG mill grate open area and aperture was evaluated in detail. This paper describes the main aspects of designing the circuit, as well as the work carried out at the industrial grinding circuit to ...
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If the tumbling mill had to do the same amount of size reduction on the pebble crusher feed, its specific energy expenditure (W tm,pc ) would be: W tm,pc = Peb fr × S c × × M ia × 4 ×
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calculations define the efficiency of a fine stagecrush ball mill circuit as to depending on ball mill feed size, and some SABC (SAG/ball mill/pebble crusher) circuits operating with an efficiency of or higher on coarse feed.
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As one of the machines widely used in mining, a semiautogenous grinding (SAG) mill can significantly improve the roughing efficiency of rock. But the SAG mill still faces the obstacles of significant energy consumption and empirical operation parameters. In order to obtain the optimal operation parameters of a SAG mill, in this paper, the discrete element method (DEM) is used to simulate the ...
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HPGR test results published by Grier (1992) on gold ores from the Mt. Todd project showed significant energy savings for a HPGR/Ball Mill circuit as compared to a SAG/Ball Mill plant. By adding a Polycom highpressure grinding roll, the throughput of existing plants can be increased by as much as 150% while simultaneously reducing the power ...
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The grinding unit will include a closedcircuit semiautogenous grinding (SAG) mill, a pebble crusher, and two ball mills. The material will thereafter undergo rougherscavenger flotation, followed by three stages of cleaner flotation. Highrate thickeners will be used to dewater the concentrate and tailings products.
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Primary crushing followed by wet SAG or AG milling and ball or pebble milling. Airswept AG milling (for coarse grind). Historically, the lowest operating cost for finegrained ores was achieved by multistage, fully autogenous grinding (Koivistoinen et al, 1989) with integrated magnetic separation steps between the stages.
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Pebble Crusher Project Construction to commence in Q1 2023. Will increase scatts crushing capacity from 120 tph to 380 tph. ... Mineralisation is associated with the presence of sulphides and quartz veining and within ironrich mafic units. The trend of the main zone of mineralisation is steeply dipping (65 º 75 º) to the east with either ...
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N = c x W x Rg x n Where: N = the gross mill power, in kW c = is a constant, nominally 1/1200 for SAG, AG and pebble mills. Breakage Rate/ Population Balance Model. W = the weight in kg of the charge. Another method of modeling the grinding process within AG and SAG mills uses population balances of the various particle size fractions.
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example, a pebble crusher is added during the return of pebbles to the SAG mill + ball mill (SAB) grinding process, which is an improved version of the SAG mill + ball mill + crusher
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bling mills (AG/SAG, rod, and ball mills) involved in reducing the size of the primary crusher product to that of the final product (usually the cyclone overflow of the last stage of grinding prior to flotation/leaching). 2. Feed rate to the circuit (dry tonnes/h) 3. Power draw of the comminution equipment (kW)
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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 major initiative that involved
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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 and kWh per ton of energy to reduce the particle size.
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Grinding is one of the most energyconsuming processes in the mining industry. As a critical part of the comminution process, autogenous grinding (AG) or semiautogenous grinding (SAG) mills are often used for primary grinding. However, the breakage mechanism of an AG/SAG mill is inefficient in grinding particles of a certain size, typically in the range of 2555 mm,, pebbles. Therefore ...
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