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Ball consumption in iron ore sag milling serious-laserde ball consumption in iron ore sag milling the following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency a mill geometry and speed bond 1954 observed grinding efficiency to be a function of ball mill diameter and established empirical relationships for
Ball consumption in sag mill ball consumption in sag mill mill grinding wikipedia 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 128m in diameter powered by a 28 mw 38000 hp motor a sag mill with a 44 134m diameter and a power of 35 mw 47000 hp has been designed
Ball consumption in sag millsag millsare autogenousmillsthat also use grinding balls like aball mill asag millis usually a primary or first stage grindersag millsuse aballcharge of 8 to 21% the largestsag millis 42 (128m) in diameter powered by a 28 mw (38000 hp) motor how to calculate the energyconsumptionof aball mill
The ball mill accepts the sag or ag mill product ball mills give a controlled final grind and produce flotation feed of a uniform size ball mills tumble iron or steel balls with the ore the balls are initially 510 cm diameter but gradually wear away as grinding of the ore proceeds the feed to ball mills (dry basis) is typically 75 vol
Grinding ball size range from 12-125 mm 45-65 hrc 1-23 % cr content grinding cylpeb of required sizes 45-65 hrc 1-23 % cr content the grinding media is produced by full-auto casting lines certified under international quality standards we guarantee our grinding ball has low breakage rate lower wear of consumption and fast delivery terms
Following a successful commissioning and start-up we believe that two grinding lines at las bambas per each consisting of one sag mill and one ball mill (this mill combination is uniquely specific to las bambas ore types) are operating at design throughput of close to 140000 tpd and within the range predicted by djb from a managed multi-sample geometallurgical testing program (ie no
One of the major problems regarding the use of ball mills is to balance the size distribution of grinding media into the mill which is determined by the speed of consumption and rate of
Oct 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 consumption in sag mill sag mills are autogenous mills that also use grinding balls like a ball mill 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 (128m) in diameter powered by a 28 mw (38000 hp) motor how to calculate the energy consumption of a ball mill
Energy consumption ball and sag mills in qatar the results showed that the hpgrball mill circuit achieved a 21 reduction in energy consumption over the existing sagball mill circuit at the same p80 grind size of 160 mircons m at a grind of 80 passing 75 m the hpgrstirred mill circuit showed a 34 reduction in energy we are a professional
Sep 17 2018 for an improved understanding the wear rate constant is directly related to the grinding media consumption rate expressed in grams of steel per kwh drawn by the mill using the simple expression: where dr represents the diameter of the new make-up balls periodically charged to the mill
Frozen charge detection and automatic loosening with gearless mill drives (sag conf 2015) mill drives: the desire for increased power and the associated limits and conditions (sag conf 2015) the engineering and process effects of choosing a motor design speed (sag conf 2015)
The high unit capacity sag millball mill circuit is dominant today and has contributed toward substantial savings in capital and operating costs which has in turn made many low-grade high-tonnage operations such as copper and gold ores feasible future circuits may see increasing use of high pressure grinding rolls (rosas et al 2012)
Aug 17 2018 ball mills these use balls for grinding media breaking the coarse feed materials by impact and attrition into extremely fine powder ball mills use a
Dec 08 2009 re: how to estimate the wear rate for ball mill most practical way to by measuring empty height and calculating the % volumetric filling of grinding mediaalternative way to make track of mill main drive kw consumption reduction and add makeup charge according to the extent of fall in power consumption
Circuit comprises a primary jaw crusher sag mill with a cone crusher on mill scats and a ball mill with a single pack of cyclones in closed circuit with the ball mill during the first decade of operation the mill was capable of processing in excess of 410 tonnes per hour (450 tons per hour) and was largely ball mill
Fig 1 sabc ab milling circuit scw solid concentration by weight fraction in the sag mill feed; jb balls charge (bulk fraction of the sag mill volume); nnc fraction of the sag mill critical speed; pc sag mill power consumption (kw); % 600 100 % of the fresh feed in the size range 152 25 mm
As the ball wear rate depends directly on the surface of the media charge a small variation in power will lead to an important increase of wear rate the risk of underloading or overloading the mill is an additional factor a direct measurement of the ball level in the mill more accurate than power readings as well as a control of it is
As a result mines have shifted their emphasis in optimization from ball mills to sag mills the rock load in the mill essentially depends on ore characteristics and the discharge rate of broken particles through the discharge end the discharge rate depends on how efficiently the
Wibm is the bond ball mill work index unitless cfnet is an empirical adjustment to a ball mill circuit cfnet 235 - 029 ln(p80) morrell mi model: morrell (2008) published a two-parameter model based on two equations (3 & 4) to describe a variety of comminution devices including single-stage sag and ag mills the cee
A few years ago mcgill university in canada developed a new and more accurate test methodology for predicting steel media consumption this test (steel media wear test) is licensed and currently being offered commercially by jktech the test also has the advantage that it produces estimates of the
The sag mill is a block added by the enderio mod a machine similar to a pulverizer or a maceratorit is used to process resources to produce dust it accepts energy in the form of redstone flux or minecraft joule with an internal buffer of 100000 rf and consumption of 20 rf per tickthe energy storage capacity and processing speed can be increased by adding one of 3 tier of capacitor into
Oct 19 2020 the sag mill is a machine added by ender ioit uses micro infinity ( i) to grind (or mill) items into their crushed variants like ores into duststhe sag mill has four output slots; recipes can have 1-4 different outputs with different chances of obtaining those outputs uniquely the sag mill can use grinding balls made from various materials to increase energy efficiency (resulting in
Sag ball consumption is average at 400 gt while ball mill grinding media (3 balls) usage in 550 gt yet you add steel and nothing seems to happen tonnage is not noticeably improved you need more tonnage and could actually use a largercoarser transfer size from the sag to ball mill
Mill is the energy consumption the power supplied to the mill is used primarily to lift the load (medium and charge) additional power is required to keep the mill rotating 813 power drawn by ball semi-autogenous and autogenous mills a simplified picture of the mill load is shown in figure 83 ad this can be used to establish the essential
Nov 26 2019 today we will learn about the difference between sag mill vs ball mill sag mill filled rate of 9% 20% sag mill grind ores through impact attrition abrasion forces in practice for a given ore and equal processing conditions the ag milling has a finer grind than sag mills the autogenous mill reduces the consumption of lining