Chino's concentrator is described in a paper presented at the 1983 meeting of the Arizona AIME Section. Each of the 28 x variable speed SAG mills is in closed circuit with a vibrating screen. SAG mill speed may be varied automatically between 65 and 73% of critical by the use of a liquid rheostat arrangement.
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AG/SAG mill is inefficient in grinding particles of a certain size, typically in the range of 2555 mm,, pebbles. 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.
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Each line consists of a variable 4. Validation speed SAG mill measuring 28 feet in diameter by 11 ft long. The mill 5. ... was unmodified Cameras were also installed to monitor the SAG feed conveyor belts for and the primary crusher gap was set between 120 and 180 mm to subsequent feed size distribution determination using the Split imaging ...
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There are several advantages and disadvantages of operating SAG mills with variable speed drives. Discussion in this paper will focus on the effects of variable speed SAG milling in relation to mill liner wear, grinding media consumption, and mill operating availability.
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Two new SAG milling models are developed in this work, able to predict power or specific energy consumption, including the usual design variables such as mill size; balls charge level, solids concentration in the SAG mill feed and % of critical speed, but adding a variable that represents the feed size distribution.
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applied to the milling circuit described by Block 3. Conclusions are discussed in Section 7. 2. Process description The singlestage closed ROM ore milling circuit considered in this study is shown in Fig. 2 and constitute a SAG mill with an enddischarge grate, a sump and a hydrocyclone. The mill receives four streams as inputs:
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Design and supply of 3,500 tph primary jaw crushing plant, discharge conveyor, stockpile feed conveyor, two SAG mill feed conveyors and four 60 reclaim belt feeders Scope included all mechanical, structural, electrical, instrumentation, controls and dust control systems and design of all concrete foundations...
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After closedcircuit secondary crushing, the SAG mill feed 80% passing (F80) size was 25 mm to 30 mm. Installed grinding power is split equally between the two mills with the SAG mill fitted with a variable speed drive (VSD). SAG discharge screen oversize ('pebbles' or 'scats') was recycled through an 185 kW pebble crusher.
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Crushed ore is fed to the ball mill through the inlet; a scoop (small screw conveyor) ensures the feed is constant. For both wet and dry ball mills, the ball mill is charged to approximately 33% with balls (range 3045%). Pulp (crushed ore and water) fills another 15% of the drum's volume so that the total volume of the drum is 50% charged.
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SAG mill speed Variable (9 to 13 rpm) 58 to 83% of critical speed SAG mill lining Steel and rubber SAG mill motor 4500 HP 1000 µm Ball Mill ... Stockpile Feed Conveyor 42 in x 230 ft Ore From U/G Stockpile Enclosure 200 ft dia x 100 Metal Detector ft Collect o r / Frother Collect o r Scavenger Cells 3 x 38m 3 Lime Lime Floc c
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The estimate considered the entire circuit operating costs from primary crushing to final grind (rougher flotation feed). The estimate utilized C per kWh for energy cost, C1050 per tonne for the cost of steel media, a wear rate of 6000 h for HPGR roll tires, 72 g/kWh for SAG mill media and 52 g/kWh for Ball mill media.
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PDF | On Sep 1, 2001, J. Karageorgos and others published SAG milling at the Fimiston plant (KCGM) | Find, read and cite all the research you need on ResearchGate
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and asymmetric conveyor offtakes to the 2 sag mills (12% balls) that the stockpile feeds. The F80s of each stream are almost identical. However, the finer feed size distribution consistently results in 50% higher throughput than the coarser one. 1 10 100 100 1000 10000 100000 size (microns) cum%pass SAG 1 feed SAG 2 feed
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The additional charge weight due steel media in a SAG mill must be considered in the mill design, and modifications may be required if an AG mill is to be converted to a SAG mill. Many circuit configurations are possible, but essentially AG and SAG mills can be operated as a singlestage primary mill or can be followed by secondary milling in a ...
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Induction and synchronous motors driving excavators, conveyors, mills, fans, and pumps use VFDs to provide high power and speed control, as well as generate significant associated energy and maintenance savings. • The TMdrive®10/30/50/70 family of drives and TMEIC motors are also wellsuited for mine hoist applications.
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In a SAG mill, operation with variable speed presents significant advantages in terms of productivity and efficiency . However, as the speed increases, the load is partially lifted in the SAG mill . At operating speed, the expected torque with 30% load and 20% of balls reaches an overload trip in the SAG mill .
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— Ball/SAG mills with up to 8'000 kW per motor, typically geared solutions ('highspeed') using asynchronous motors with 68 poles and rated speed 1'000 1'800 rpm — HPGR with rated power 1'500 3'000 kW — RMD with up to 9'000 kW as single pinion and up to 18'000 kW as dual pinion
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As the second optimization strategy for the SAG milling process, after identifying the variables of interest through the correlation study and the adjustment of the machine learning models presented in Section, the variable SAG rotational speed (RPM), solids in the feed (%), and SAG pressure (fill level) were fitted to evaluate TpH ...
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The HPGR feed stockpile is frequently pulled out to achieve a capacity of 65,000 t providing feed buffer to the HPGR during crusher or conveyor maintenance. The limited primary feed bin of...
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exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell,, van der Westhuizen,, Mainza, 2009). However, SAG mill weight is difficult to control as the dynamic response changes as the mill approaches maximum capacity.
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Further tests indicated that: (a) a reduction to kWh/t by increasing the mill speed (SAG6), (b) an increased to kWh/t by reducing the number of pebble ports open (SAG12), (c) an increase to kWh/t by coarsening the feed size distribution together with increasing the mill speed (SAG9), as well as (d) a reduction to kWh/t by ...
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Mill operating conditions including mill speed (for circuits with variablespeed drives), density, and total mill load. The effect of feed hardness is the most significant driver for AG/SAG performance; with variations in ore hardness come variations in circuit throughput.
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