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The design of mill liners and SAG mill discharge grates will have a large effect on how efficiently the mill operates and the circuit throughput. All models generally assume that a mill is fitted with "efficient" liners and that the grate design neither limits passage of pebbles (and pulp) nor permits re-circulation of pulp back into the mill.
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The circuit comprises a SAG mill, 12 m diameter by 6.1 m length (belly inside liners, the effective grinding volume), two pebble crushers, and two ball mills in parallel closed with cyclones. The SAG mill is fitted with a 20 MW gearless drive motor with bi-directional rotational capacity.
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The hypothesis put forward in this paper is that active control of the cone crusheru27s 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 …
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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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Pebble Crushing. The pebble crusher is considered part of the SAG mill for the purposes of this model. The displayed E peb value will always be zero, but the displayed E asag will include the shell power of the SAG mill plus the usable power of the pebble crusher. Unlike other models, there is no explicit benefit to E total efficiency due to ...
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Offloading (S)AG Mills pebble crushing via HPGR Thanks to this intense pressure and wear resistant rollers, HPGRs are more effective pebble crushers than conventional cone crushers. Where significant build-up of pebbles in (S)AG mills can become a real bottleneck in meeting the required plant capacity, re-crushing of the pebbles is of great ...
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The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill.
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Pebble mills use rock pebbles as the grinding media to cause friction and attrition between the pebbles and ore material. Pebble mills may be used when metal balls must be avoided. Autogenous grinding (AG) and semi-autogenous grinding (SAG) mills use the material to be ground as the grinding media. Autogenous grinding mills use larger rocks to ...
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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 ® TC series, to achieve higher throughput rates in the milling circuit. * McIvor, R. & Greenwood, B. (1996). Pebble Use and Treatment at Cleveland-Cliffs' Autogenous Mill Operations.
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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 grinding process.
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SAG mill by feeding crushed pebbles The standard destination for crushed pebbles has been to return them to SAG feed. However, open circuiting the SAG mill by feeding crushed pebbles directly to a ball-mill circuit is often considered as …
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Pebble Crusher Feed, t/h . 900. 900. 900. 900. Pebble Crusher Power Consumption, kW ... The results from this model are in good agreement with the measured data from the SAG mill at Sarcheshmeh ...
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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 …
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A pebble crusher will receive scats from the SAG mill, crush them and return them to the SAG for further grinding. The process will include a conventional single-line SAG mill circuit (Semi-Autogenous Ball Mill Crushing, or SABC) followed by conventional flotation to produce concentrate for sale.
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A semi-autogenous (SAG) or autogenous mills (AG) circuit commonly comprises a pebble (cone) crusher to deal with the critical size particles. The pebbles crusher is often oversized, and thus not fully utilized.
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The circuit consists of a 60 x 113 primary crusher, two 16 MW SAG mills and two 16 MW ball mills. All four mills are twin pinion with wound rotor motor and gearbox drives. Provision for pebble crushing is provided for primary (hypogene) ore treatment later in mine life. The derivation of the mill's specific
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Regardless of whether they're receiving feed directly from an upstream SAG mill or further reducing pebbles that have passed through a dedicated cone crusher, HPGRs offer highly efficient reduction, generating substantial amounts of fines that reduce the energy required for downstream milling, says.
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Figure 8: Effe ct of Recycle Crusher on SAG Mill Circuit Stability. ... (19–75 mm) from a SAG mill. At the optimum pebble content of 25% by volume, a …
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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.) …
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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 of the feed will have these characteristics of higher hardness and lower breakability relative to the ...
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pebble crusher, a 10.97m (36') SAG mill and a 7.3m (24') ball mill in . Page 5 Figure 3. Schematic of the Newcrest Mining Telfer Operation grinding circuit. The Telfer grinding circuit is very well designed and constructed with the ability to blend ore using radial stackers over the coarse ore stockpile. In
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Mill 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 …
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The grinding circuit consists of an SABC circuit, with a SAG mill followed by a ball mill and a pebble crusher to crush the SAG mill trommel oversize material. Primary crushed ore is reclaimed from the stockpile via two apron feeders which can operate individually or in parallel to provide the 385 t/h. The mill feed is conveyed to the primary
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A pebble crusher will receive scats from the SAG mill, crush them and return them to the SAG for further grinding. The SAG cyclone overflow reports to the thickener feed box and the underflow reports back to the SAG mill. The SAG mill discharges onto a double deck screen with 6.35 mm bottom openings.
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Ø The pebble recycle load was significantly lower than design (500tph compared to 700tph for design). Ø SAG mill efficiency was highly dependent …
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Pebble crushing is very topical: as we dig deeper into mines, the ore is getting harder and ore grades are declining, causing the build-up of pebbles in mills to become a greater concern. If pebbles are not dealt with appropriately, they start to occupy a large part of the mill and reduce its processing capacity.
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Gyratory crusher; HPGR; Pebble crusher; SAG mill; Vertical mill / Tower; Vertical mill / Tower; Vertical mill / Tower; ; ; ; ; MP800; MP1000; ThyssenKrupp BK 63-75; Polysius PM 8-24 / 17 M; Kawasaki 1500Z; ; VTM-1250-WB; VTM-650-WB; VTM-3000-WB; 32' x 16' 22' x 36.5'
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It is assumed that a pebble crusher will be used in the comminution circuit to provide some additional grinding power and to manage critical size fraction material. The SAG Mill is equipped with a variable speed drive which will …
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In Figure 7.35 shows the SAG mill closed with a crusher (recycle or pebble crusher). In SAG mill operation, the grinding rate passes through a minimum at a "critical size" ( Chapter 5 ), which represents material too large to be broken by the steel grinding media, but has a …
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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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