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Mill filling is an important operational parameter in a SAG mill circuit and by its control and optimisation it can produce significant improvements in production capacity and energy efficiency. However, it is industry practice to report mill load as the total output given by load cells, or kPa for systems based on lubriion bearing back
2011621&ensp·&enspDEM SIMULATION OF MILL CHARGE IN 3D VIA GPU COMPUTING *R.K.Rajamani1 and S.Callahan2, 3, opens up the three dimensional simulation as a routine task for mill designers and would have the capability to simulate all aspects of say a SAG mill during the design phase. Cleary and Morrison (2009) show that 3D DEM combined with SPH is a tool
201713&ensp·&ensp2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP Ballmill scale up (Bond's Law)Data: zBond work index w i zFeed D f and product d size (both 80% cumulative passing) Result: The specific grinding energy w Mill power draw P = wT, where T the mill capacity Mill dimensions (from Tables or charts)
2017627&ensp·&enspmanufacture of a 咈'x29' SAG mill. The mill will be driven by a Gearless Motor Drive (GMD) which, at 28.0MW, is equal to the largest grinding mill power ever used in the mining industry. The SAG mill design is based on Outotec's proprietary grinding mill technology, developed over decades for maximum reliability and performance.
Combine ABB's variablespeed drive system with advanced process control ABB Ability™ Expert Optimizer for grinding to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ringgeared mill drives (RMD) or gearless mill drives (GMD).
An ore like quartzite is very competent and will not break up easily in an SAG mill. Soft and fragile ore like bauxite or specular hematite will break up relatively easily. Again, clayey and oxidised ore may be too soft to serve as a grinding medium and therefore are classified as incompetent ore.
2018426&ensp·&enspPictures of the insides of an AG mill and a SAG mill which have been crash stopped are shown in Figures 5 and 6 respectively. Accurate measurements of the ball filling can only be made after the mill is ground out. In this case the mill is operated with the feed turned off until all of the ore has exited the mill.
sag mill trunnion liner_Mill Trunnion LinerMineral Processing & MetallurgyThe Mill Trunnion Liner fits inside the bearing to protect it from wear caused by the ore being washed over the liner and through the beari. Agitation equipment which forces the slurry to take up and down circulation Inquire Now. Gold Extraction Equipment.
2019109&ensp·&enspfilling in the mill and not related to total mill filling. Discharge through an individual opening on the grate is driven by the factors of ore filling, radial position and the size of the aperture. The results indie that 1.18 mm is approximately the size below which particles
2018626&ensp·&enspHistory. Brian Loveday (1978) published a scaleup procedure for autogenous pilot plant power draw to industrial sized machines that used an empirical power number to encompass all the motion effects of a mill charge. Derek Barratt (2002) derived a set of power numbers for industrial machines for use in Loveday's base formula, where a power number for a particular mill filling and
•Three commonly used mill motor types: –Gearless drives •largest size, up to 28 MW •highest efficiency –Synchronous with pinion •one or two pinion configuration, up to 15.6 MW –Induction motor with speed reducer •one or two pinion configuration •cheapest capital, but poorest electric efficiency
2009730&ensp·&enspmaterial in the mill including the media which may be steel balls in a ball mill, or large lumps of ore in an autogenous mill or a mixture in a semiautogenous mill, as well as the slurry that makes up the operating charge. Let Jt be the fraction of the mill volume that is occupied by the total charge, Jb the fraction of the mill volume that
20191115&ensp·&enspDepending 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 2.0 and 7.5 kWh per ton of energy to reduce the particle size.
Product from the SAG mill passes through internal grates onto a trommel screen which scalps +7mm material and returns it to the SAG mill feed conveyor. In situ Block Size 1.103 m SAG mills require a certain ore feed size distribution to operate efficiently. run at a constant mill filling and speed, and hence constant power, so 10mm with
In both instances it has been found invaluable to initiate the study by developing a full grindcurve of the mill. For a SAG mill there are many variables against which a grindcurve can be developed. The ones that can be most readily varied, and are common control parameters, are mill speed, mill filling
Online SAG Mill Pluse Measurement and Optimization signature could be effectively used to optimize the milling performance by investigating this signature's relation to mill product size, mill throughput, makeup ball size, mill speed, liner profile and ball addition rates. The mill speed, ball size, and mill filling were varied here
2012918&ensp·&enspOptimization and Control of a Primary SAG Mill Using Realtime Grind Measurement C.W Steyn*, K Keet**, W Breytenbach*** this algorithm was up until now based on shiftly averages which do not er for higher (than shiftly) Two silos containing Merensky and UG2 ore respectively feed the mill
SAG Mill Control . SAG mills can be optimized for maximum ore throughput or maximum grinding energy efficiency. In both cases, precise control of the mill filling percentage is critical (Wills and NapierMunn, 2006). Maintaining constant mill weight, as indied by bearing pressure, is one approach to stabilize the mill filling percentage.
20151125&ensp·&enspSAG power draw survey tabulation This LibreOffice spreadsheet contains the raw data used to create Table 1 and Table 2 of the paper "An updated data set for SAG mill power model calibration" presented at IMPC 2016 in Quebec City, Canada in September, 2016.
201356&ensp·&enspComparison of Ore Hardness Measurements for Grinding Mill Design for the Tenke Project John Starkey1, Principal Consulting Engineer (SAG to T80 12 M followed by Bond BM Wi on SAG ground ore) • Bond Ball Mill Work Index (Crushed Feed) • Specific Gravity (part of the SAGDesign test). These are tests which up to the present have been