(pdf) optimization of the sag mill circuit at kinross jksimmet sag, screen, ball mill and hydrocyclone models w ere calibrated based on survey data collected in july 2009, mass balance results, plant operating data, ore c haracterisation model:bond/barratt sabc models sagmillingsag circuits (where the t 80 hits the upper limit) will result in the ball mill overgrinding unless the ball mill speed is reduced to control the grind size (in the case of a variable speed mill). ball circuits (where the t 80 hits the lower limit) will result in the charge level in the sag mill dropping until its power draw ball mills and sag mill problem amp maintenance forumsi work in an industrial copper company as vibration analysis supervisor. this company started to work about 2 s ago. we have two ball mills and one sag mill. we had some visual inspection on pinion and ring gears, during these inspections we found some abnormal wear on this gears (pictures show this problem in enclosure).
sag mill high vibration amp maintenance forums
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vibration sag mill motor nde bearing amp maintenance forumssee more results 3vertical ball mill can grind coarse and hard granular the ball diameter is smaller than that of horizontal ball mill. glass balls or ceramic balls (such as vertical ceramic ball mill ) can also be used according to the grinding requirements. for the case where the finished product has special purity, the grinding medium can also be the raw material with a larger size (such as sag mill ). sag mill ball sizing grinding ampclassification circuits with high aspect ratio sag mills total charge to ball charge ratio should be greater than 2 (up to 2.5) for a coarse mill feed (say f80 gt110 mm). if the mill feed size is fine, say 50 mm or 30 mm, then you are looking at a total charge to ball charge ratio of about 1.51.6. sag mill grinding circuit design 911metallurgist the design of large mills has become increasingly more complicated as the size has increased and there is little doubt that without sophisticated design procedures such as the use of the finite element method the required factors of safety would make large mills prohibitively expensive. in the past the design of small mills, up to +/ 2,5 metres diameter, was carried out using empirical formulae with relatively large factors of safety. as the diameter and length of mills increased several critical problem areas were identified. one of the most important was the severe stressing which took place at the connection of the mill shell and the trunnion bearing end plates, which is further aggravated by the considerable distortion of the shell and the bearing journals due to the dynamic load effect of the rotating mill with a heavy mass of ore and pulp being lifted and dropped as the grinding process took place. incidentally the design calculation of the deformations of journal and mill sh see full list on 911metallurgist kidston g mines is a 14 000 tonnes per day rated operation located 280 kilometers west of townsvilie in queensland. the principle shareher is placer development . kidstons orebody consists of 44.2 million tonnes graded at 1.79 g/t g and 2.22 g/t silver. production commenced in january, 1985, and despite a number of control, mechanical and electrical problems, each month has seen a steady improvement in plant performance to a current level of over ninety percent rated capacity. see full list on 911metallurgist the cyanidation plant consists of a primary crushing plant, a semiautogenous grinding circuit, agitation leaching circuit, cyclone wash circuit, g recovery circuit and carbon regeneration circuit. the grinding circuit comprises one 8530 mm diameter x 3650 mm semiautogenous mill driven by a 3954 kw variable speed dc motor, and one 5030 mm diameter x 8340 mm secondary ball mill driven by a 3730 kw synchronous motor. four 1067 x 2400 mm vibrating feeders under the coarse ore stockpile feed the sag mill via a 1067 mm feed belt equipped with a belt scale. feed rate was initially controlled by the sag mill power draw with bearing pressure as override. integral with the grinding circuit is a 1500 cubic meter capacity agitated surge tank equipped with level sensors and variable speed pumps. this acts as a buffer between the grinding circuit and the flow rate sensitive cycloning and thickening sections. see full list on 911metallurgist the kidston plant was designed to process 7500 tpd fresh ore of average hardnessbut to optimise profit during the first two s of operation when softer oxide ore will be treated, the process equipment was sized to handle a throughput of up to 14 000 tpd. some of the equipment, therefore, will become standby units at the normal throughputs of 7 000 to 8 000 tpd, or additional milling capacity may be installed. the sag mill incorporates a design which allowed expedient manufacturing to high quality specifications, achieved by selecting a shell to head to trunnion configuration of solid elements bolted together. this eliminates difficult to fabricate and inspect areas such as a fabricated head welded to shell plate, fabricated ribbed heads, plate or casting welded to the head in the knuckle area and transition between the head and trunnion. motor torque at full load current is 214.4 knm up to base speed (176 rpm) and 184.0 knm from base to top speed. maximum accelerating torque is see full list on 911metallurgist considerable variation in ore hardness, the late commissioning of much of the instrumentation and an eagerness to maximise mill throughput led to frequent mill overloading during the first four months of operation. the natural operator overreaction to overloads resulted numerous mill grindouts, about sixteen hours in total, which in turn were largely responsible for grate failure and severe liner peening. first evidence of grate failure occurred at 678 000 tonnes throughput, and at 850 000 tonnes, after three grates had been replaced on separate occasions, the remaining 25 were renewed. the cylinder liners were so badly peened at this stage that no liner edge could be discerned except under very close scrutiny and grate apertures had closed to 48 percent of their original open area. the original sag mill control loop, a mill motor power draw set point of 5200 amperes controlling the coarse ore feeder speeds, was soon found to give excessive variation in the mill ore charge volume a see full list on 911metallurgist design changes to date have, predictably, mostly concentrated on improving liner life and minimising discharge grate damage. four discharge grates with thickened ends have performed satisfactorily and a mk3 version with separate lifters and 20 mm apertures is currently being cast by minneapolis electric. cylinder liners will continue to be replaced with high profile lifters only on a complete reline basis. while there is the problem of reduced milling capacity with reduced lifter height towards the end of liner life, it is hoped to largely offset this by operating at higher mill speeds. mill feed chute liner life continues to be a problem. the original chromemoly liners lasted some three months and a subsequent trial with 75 mm thick clamped linhard (rubber) liners turned in a rather dismal life of three weeks. see full list on 911metallurgist
Advantages of main technical parameters ball mill sag
main technical parameters of wetgrinding gratedischarge ball mills and rod mills are essential mining equipment for further size reduction of ore after the crushing stage. they are applicable to the comminution of dry or wet ores and other grindable materials in ferrous and nonferrous metal processing plants, cement plants, refractory plants, fertilizer plants, and smelters. what's the difference between sag mill and ball mill jxsc 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. a comparativesag mill power includes a correction for the interstitial mill filling. in the case of the estimated ball mill power, the power was calculated using the bond methodology. table 4 shows the principle parameters obtained. the 25th percentile throughput rate corresponds to the 75th percentile axb value. buy horizontal ball mill for fine grinding and mixing of high the horizontal ball mill grinds and disperses under closed conditions to prevent solvent evaporation. the grinding barrel, inlet and outlet of the horizontal ball mill are made of disposable hot casting wearresistant polyurethane, which has the characteristics of high wear resistance, good sealing, low pollution, low noise, fineness, low consumption, convenient feeding and discharging, and is ball mill (mqs/mqy) lk (china manufacturer) mining our market share in china exceeds 80% with the largest mills supplied to date being a Ø7.9m x 13.6m 2x8.5mw ball mill and a Ø11m x 5.4m 2x8.5mw sag mill , being the largest in china. 1.main technical parameters of grate ball mill: autogenous mill sag mill sag mill manufacturerhongji groupsemiautogenous mill, abbreviated for sag mill, is essentially autogenous mill, but it utilizes grinding balls to grind materials as a ball mill. a sag mill is generally used as a primary or first stage grinding materials. the semiautogenous mill use a minimal ball charge of 6 to 15%. the diameter of semiautogenous mill can be as large as 42mm. grinding mills an overview sciencedirect topicsthe crushed pebbles fall directly onto the sag mill feed belt and return to the sag mill. sag mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 mw twin pinion drive. the ball mills are operated at a ball charge volume of 3032% and 78.5% critical speed.
The case of main technical parameters ball mill sag
model:amelunxen sgi sagmillingamelunxen sgi model. this is a model that estimates the specific energy consumption of a sag or ag mill plus ball mill circuit using the equation by amelunxen (2014) for e sag and the classical bond work index equation for e ball substituting cf ball in the place of the rowland efficiency factors. technical data sheets for ball mill mayukhportfolio.inthe following technical data sheets show some of the standard technical data sheet. milling. the selection and type of mill you require, fag, sag, sabc, rod or ball, is at best difficult, and depends on ultimately on test work difference between sag mill vs ball mill mech4studyoct 12, 2017 · sag mill make use of steel balls included with some large and hard rocks for grinding. these mills utilize the balls in making the large fragments of materials broken into pieces. the ball charge of a sag mill is about 9% to 20%.this process takes place inside the large rotating drum of sag mill which is filled with balls partially. ball mills industry grinder for mineral processing jxsc the ball milling process prepared by rod mill, sag mill (autogenous / semi autogenous grinding mill), jaw crusher, cone crusher, and other single or multistage crushing and screening. ball mill manufacturer with more than 35 s of experience in grinding balls mill technology, jxsc design and produce heavyduty scientific ball mill ball mills industry grinder for mineral processing jxsc the ball milling process prepared by rod mill, sag mill (autogenous / semi autogenous grinding mill), jaw crusher, cone crusher, and other single or multistage crushing and screening. ball mill manufacturer with more than 35 s of experience in grinding balls mill technology, jxsc design and produce heavyduty scientific ball mill modelling sag milling power and specific energy consumption ness of the models. for a given mill to have a combination of feed size, ball load, mill speed and % solids will represent the total load. ball mill sag mill scw jb pc % 6quot+1quotn/nc fresh feed water water pebble crusher screen cyclones sump pump fig. 1. sabc a/b milling circuit.
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