Jan 01, 2005 ball-mill circuit operation. very often in sag circuits, the ball-mill circuit is neglected. in many operations where economics dictate that throughput is worth more economically than the required sacrifice in grind, the focus shifts to throughput so much that the available ball-mill power is not used to the fullest extent.
Lg a mill power equation for sag mills. minerals and metallurgical processing. feb 1990 pp57-62. gross power no load power net power drawn by the charge 8.13 the net power is calculated from net power kd2.5l e! c./ watts 8.14 in equation 8.14, d is the diameter inside the mill liners and le is the effective length of the mill including the ball mill.Ball mill controls biokobras.es. 2021-4-17 sag and ball mill controls. mill wikipedia. sag is an acronym for semi-autogenous grinding. sag mills are autogenous mills that also use grinding balls like a ball mill. sag mill is usually a primary or first stage grinder. sag mills use a ball charge of to the largest sag mill . read more.
Oct 25, 2018 at the lihir gold mine, the plant was utilizing mill’s bearing pressure to calculate load measurement for the sag mill in hgo1. the use of sag mill weight for process control is additionally complicated at lihir by compromised and suddenly drifting load cell and bearing pressure measurements on two of the process plant’s three sag mills.
Sep 28, 2020 sag mill and ball mill. contact for price - saleslorystore.com. girth gear as per dwg 44001023. toshiba 3 phase induction motor used mill drive gear reducer 640 m2 5.63. outer feed head liner - m-9205-03. feed end shell liner - m-9195-1-07. discharge end shell liner m-9195-07. feed trunnion liner sag mill-.
2. the sag mill power mw 3. the sag mill feed rate tph 4. the sag mill weight tonnes figure 10. the performance of train 1 sag mill - before the new manta cube. it can be seen from this set of operational data that the mill weight varies over a wide range and this is consistent with normal operator control of a sag mill.Model within the expert system for sag mill control. abstract. an expert system applied to the control of mineral process unit operations is, by its nature, the site best ball mill line at ok tedi consists of two sag mills, each feeding a pair of ball mills. the sag mills are 9.6 m diameter by 4.3 m long and each have about 6,800 kw installed .A sag mill is usually a primary or first stage grinder. sag mills use a ball charge of 8 to 21.   the largest sag mill is 42′ 12.8m in diameter, powered by a 28 mw 38,000 hp motor.  a sag mill with a 44′ 13.4m diameter and a power of 35 mw 47,000 hp has been designed. [9 ball mill.Oct 12, 2017 1. sag mill is the primary tool for grinding. sag mill is used before the other mills. ball mill is a secondary, and it is used after the sag mill. 2. sag mill breaks the raw material into pieces for the further grinding. ball mill is used to grind the pieces of raw material into. powder-like structures. 3.
Gold ball mill circuit. circuit a sag mill followed by two ball m ill lines the run of mine rom ore s ent o the sag mill plant is transported from the open pit by truc ks and dumped to a griz zly get price ball mill circuit in gold production caf ol mouteh gold processing plant is located in esfahan province and a ball mill is in its grinding circuit.
Figures 8 and 9 on the right show results from a gold plant’s sag mill achieved with millstar’s segregated ore feed controller combined with the power optimiser: • the standard deviation of the mill feed control is greatly reduced. • the cyclone feed is more stable, allowing for consistent size separation and feed to downstream processes.Control of -semiautogenous grindingsag mill weight is an example of an important process that 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, m.s., van der westhuizen, a.p., & mainza, a.n. 2009.
Semi-autogenous grinding uses a minimal ball charge in the range of 6-15 while autogenous grinding uses ore only. sag and ag mills operate by lifting ore/grinding media and dropping it on the operating bed of the mill charge. high impacts from lifting ore and media promote impact breakage which is the primary mechanism for size reduction in the mill.
Supported grinding mills up to the largest sizes. sag/ball mill circuit incorporating pebble crushers and a polycom high-pressure grinding roll. sag and ball mill for gold ore grinding. one of three sag mills with 9.75 m diameter and 2 x 4000 kw drive power. these mills operate in conjunction with ball mills for iron ore grinding in iran.
Sag mill discharge. controlling the feed and discharge of a mill is mostly a stabilisation exercise – you need to be able to quickly and accurately control the mill feed rate. if the mill feed setpoint is changed, then the actual feed rate needs to stabilise at the new target in a short period of time. the feed rate setpoint can then be tied ball mill.In general, the sag mill manufacturers will control the addition amount of medium such as steel ball at 2-8, so that the capacity of semi sag mill to process materials can be increased by 10-30. the sag mill liners wear will increase by 15 due to the impact of medium such as steel ball during the sag mill ball mill.
Single stage sag mills are very beneficial in reducing capex for plants with a staged throughput approach. when future tonnage is to be increased, the sag mill can feed downstream ball milling to boost capacity. fuller-traylor sag/ag mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kw.Nov 26, 2019 both the autogenous grinding mill and the ball mill feed parts are welded with groove and embedded inner wear-resistant lining plate. as the sag mill does not contain grinding medium, the abrasion and impact on the equipment are relatively small. the ball mill.
The 4.27 m x 12.94 m egl secondary ball mill is fitted with a 4125 kw motor and operates in overflow configuration. ball mill discharge slurry gravitates to the feed of the sag mill discharge screen situated above the mill discharge hopper. in 2002, the grinding circuit became sag mill limited by the competency of the mill feed. in.
Aug 01, 1992 e ag/sag mill theory - text and graphics explaining grinding definitions, the fundamentals of ag and sag mills, mill control strategies, techniques for handling problems with overviscous pulps and effects of variation of mill speed, ball load and total mill charge on ball mill.
Mill control: ball mill control example process description the copper concentrator in pinto valley, arizona processes a 0.4 grade copper ore from a nearby open pit mine. the unit operations consisting of crushing, grinding, and flotation process about 65,000 tons of ore per day in six overflow ball mills.There are two lines consisting of this sag - ball mill combination where the sags are denoted as sag1 and sag2. note: each sag mill is operated in a closed circuit manner in conjunction with a typical trommel screen and pebble crushing circuit. the ball mills are also operated in a closed circuit employing two hydrocyclone separators. the.Sag mill 24’ diameter 2240 kw variable speed double deck vibrating screen 8’ x 16’ sandvik cone crusher hydrocone h4800 250 kw asri gap control 6 x 15 krebs gmax cyclones ball mill 14’ dia. x 21’ 2240 kw flotation underground storage bins a b wipfrag feed size measurement impactmeter.Difference between sag mill vs ball mill - mech4study. ball mill is a fine grinder. a horizontal or vertical rotating cylinder which is filled partially with the balls of ceramics, small rocks and balls made from stainless steel. the ball charge of a s mill is about 29 to 30.
Of the set point optimising control system is planned to be completed by mid 2002 and comprises of a supervisory grinding circuit control system prior to the sag mill control system being implemented the control room which over looks the sag mill and the ball mills to produce a grinding operator used to run the sag mill manually.Aug 01, 1992 the plant processes gold ores from a wide variety of sources at rates between 85 and 125 tons/hour through a two stage sag/ball mill grinding circuit. all the plant information monitoring and control is carried out through a micromax process management centre pmc.Jan 01, 2013 a cone crusher reduces the sag’s discharge screen’s oversize material. a 14 foot diameter ball mill ensures final grinding before the flotation stage.many control strategies were used at the sag over the past few years. fuzzy logic was first used in 2007 in order to control tonnage feed to the sag.Jun 06, 2016 restated, the designed sag mill size and operating conditions typically control circuit throughput, while the ball-mill circuit installed power controls the final grind size. aside from parameters fixed at design mill dimensions, installed power, and circuit type, the major variables affecting ag/sag mill circuit performance throughput and grind attained include ball mill.
Sag milling extends itself to many applications due to the range of mill sizes available. they 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 done by a ball mill. sag mills are also an optimum solution for wet grinding since crushing and screening in these ball mill.
Sag and mill controls. sag mill product feeds two parallel ball mills of 66 m 111 m internal diameter length each with a 97 mw twin pinion drive the ball mills are operated at a ball charge volume of 3032 and 785 critical speed the sag mill trommel undersize is combined with the ball mills discharge and pumped to two parallel packs clusters of ball mill.
Where i work now, minera san cristobal in bolivia, we use sound control on both the sag and ball mills. the result of this control is a 25 increase in throughput, over the plant design, with a 10 reduction in energy consumption; the mill is more efficient. the mill control manipulates the feed rate and mill speed depending on ore and liner conditions. liner wear has improved and ball consumption has decreased. great job pueblo viejo keep focused on this control ball mill.
Aug 25, 2004 we have an application in a sag mill where we have installed an electronic ear in order to listen the noise produced by the balls falling to the bottom of the mill. our idea is to convert the amplitude and frequency of noise to a 4-20ma signal or something else in order to determine if the ball is crushing the mineral or the mill lining.Sag mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. the best way to measure load is to mount the mill on load cells. the load cells are calibrated to measure the total weight of water, grinding media balls and ore in the mill ball mill.
Model predictive control on a sag mill and ball mills the solution for the sag mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure. the solution automatically controls ore master feed rate and water addition to increase throughput, while keeping mill load within.
From "Melody Mining Machinery", link: https://www.iran-pen.org/news/ball-mill/19123.html .If you need to reprint, please indicate the source, otherwise you will be investigated for legal responsibility.
24*7 Online SupportGet Quote
Copyright © 2020 Crusher Mining Machinery Company All rights reserved sitemap