Jan 01, 2007· The extensive research work carried out by Latchireddi and Morrell (1997,2003a and 2003b) has demonstrated to think of the SAG as more of a pump in which the grates and pulp discharger end (“impeller”) were designed to efficiently discharge the product sized particles smaller than the grate size with minimal recirculation out of the mill ,
Get MoreThe main problem with these harder ore types is that they hold up in the SAG mills, restricting throughput The SAG mill feed is controlled by the mill weight, measured by 4 load cells on the mill bearing system Therefore if the ore does not grind quickly enough in the SAG mills, the mill weight increases and the control system reduces feed to ,
Get MoreThis means that the number of crushing stages can be reduced depending on the feed size accepted by primary grinding stage Image of a “Classical” 3-stage ore crushing prior to rod mill [image: (135-5-1)] Diagram of Typical 1-2 stage ore crushing prior to AG-SAG mill [image: (135-5-2)] Calculation of Reduction Ratio in Crushing
Get MoreHere is a formula that allows you to calculate the circulating load ratio around a ball mill and hydrocylone as part of a grinding circuit For example your ball mill is in closed circuit with a set of cyclon The grinding mill receives crushed ore feed The pulp densities around your cyclone are sampled and known over an 8-hour shift, allowing to calculate corresponding to circulating load ,
Get Moretwo-stage HPGR operation with a single, , and AG/SAG mills for , that classifier efficiency and recycle load in closed ball mill circuits can have a significant influence on the apparent ,
Get MoreMill (grinding) – Wikipedia, the free encyclopedia To calculate the needed grinding work against the grain size changing three half-empirical models are used ,SAG mills use ,
Get MoreFeed to the IsaMill™ passes through 8 consecutive grinding stages between the discs before it reaches the internal classifier Other mills with just one grinding stage require closed circuit cyclones and high recirculating loads and still don't produce product size distributions as steep as the IsaMill™
Get MoreThe Morrell Mi single-stage SAG model using the assumed ball mill work index F 80 and grams per revolution from the 212 µm closed test results in the following: Survey 1: F 80 =791 mm; P 80 =152 µm; E asag = 127 kWh/t (56% low) Survey 2: F 80 =724 mm; P 80 =154 µm; E asag = 1255 kWh/t (43% low) Checking the Mi calculation
Get MoreMultistage crushing plants, including high pressure grinding roll (HPGR) circuits, require more , materials handling equipment than SAG and ball mill circuits The energy consumption of , Composite Circulating Load The degree of recirculation within the crushing circuit will affect the power requirement A ,
Get Morecalculate ball mill residence time – The Q&A wiki Primary Rod Mill followed by Secondary Ball Mill calculate ball mill residence time – The Q&A wiki the hydraulic residence time t is given by t=V/q where V is the volume950 – 1350 ,small diameter ball mills 4 *Motor power at 35% ball charge , hensive calculation know-how
Get Moreefficient, single stage SAG milling is likely to be the most profitable grinding circuit design 2 Medium Grind – 80% passing size between 106 and 75 µm To mill in single stage SAG configuration, the feed must be consistent, not too coarse or too fine The downstream process must be able to handle fluctuations in the grind size If these
Get MoreThe grinding circuit for the Copper Mountain project consists of one FL SAG mill and two FL ball mills Figure 1 - Overview grinding circuit The Copper Mountain SAG mill is 10363 mm [34 feet] in diameter and 6096 mm [20 feet] long It is a grate discharge mill with an inside diameter of 10363 mm [34 feet] and a grinding length of 5334
Get Moresingle-stage SAG mills to the largest mill in the world – with a 40-foot diameter and 28 MW of motor power Ball mills Ball milling is the most common application for horizontal tumbling mills Outotec offers a full range of ball mills to suit a wide variety of duties, from a few hundred kW all the way up to 20 MW and beyond Rod mills
Get MoreOct 15, 2020· The SAG mill will be a single pinion low aspect mill, operating in a closed circuit The mill has an inside diameter of 38m and an effective grinding length (EGL) of 50m The mill receives coarse ore and process water at a variable flowrate to achieve the correct pulp density Lime and zinc sulphate are also dosed to the SAG mill to condition ,
Get Moresag mill design calculations As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including quarry, aggregate, and different kinds of minerals
Get MoreCirculating load calculations irculating load calculation formulahere is a formula that allows you to calculate the circulating load ratio around a ball mill and hydrocylone as part of a grinding circuit for example your ball mill is in closed circuit with a set of cyclones circulating load calculation in ball mill grinding mill circulating load,
Get Morerecirculating load – and at the same time preventing excessive equipment wear The specific variables to be accommodated and the best strategy to control the grinding process will depend on the actual process circumstances, and the type of mill and drive involved In modern grinding, ball mills and SAG mills are two types of mill commonly found
Get MoreAN OVERVIEW OF SINGLE STAGE AUTOGENOUS AND SEMIAUTOGENOUS GRINDING , used to balance the rate of impact breakage within the circuit) 3 SAG mill (8 – 15% ball charge) Variable competency ore ,Mill Load Power Draw Circulating »More detailed
Get MoreSAG mills mimic the same shortcoming It follows that in order to obtain the speciﬁ c energy (SE) to achieve a certain transfer size, based on the 80 per cent passing value, an inefﬁ ciency factor must be applied to the SE of single stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method
Get MoreSingle 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 43m through 122m in diameter with powers as high as 28,000 kW Our team of product ,
Get MoreSep 29, 2020· A problem for solving mass balances in mineral processing plants is the calculation of circulating load in closed circuits A family of possible methods for the resolution of these calculations ,
Get MoreThe 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 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 30–32% and 785% critical speed
Get MoreJan 01, 2016· The first two types may be called single-stage operation, while the last two are two-stage operations Most AG/SAG mills operate in open circuit (Figure 93) when the product size is usually coarseUsually, provision exists for installing a classifier such as a straight screen, a trommel or a curved DSM screen to remove critical sized pebbles (scats)
Get More• Full load running torque required at the kiln or mill shell at inching operating speed Typically this is set at 120% of main drive operating torque • The desired output speed at the shell Usually this is targeted at 01 RPM with a range of +50% / -10% • Single or dual pinions driving the ring gear • Mill ,
Get MoreWhy do ball mills have such high circulating loads?The ball mill grinds The cyclones separate But the pump neither grinds nor separat So what is the purpose of having such a big pump to maintain high circulating loads in our grinding circuit?A recent grinding bulletin addresses this question f
Get Moremill discharge product size in relation to the lifting effect of the liners In this specific case, it is obvious that a certain load expansion is needed to allow the coarse particles entering the media charge to be reduced Therefore, at this stage, a direct measurement of the dynamics in the mill gives very valuable information to the operator
Get MoreVRM and ball mill circulating load - Page 1 of 1 Sep 07, 2011 Re: VRM and ball mill circulating load Mainly in USA , the term circulating load is more often used than the circulation factorCirculating load is percentage of coarse return in relation to fines & it can be calculated by : Coarse return TPH X 100 / Mill output TPHNormal range of cirulating load in a conventional close ,
Get Moretypical load factor for sag mill motor It is used for determining the overall cost per unit generated higher the load factor, lesser will be the cost per unit load factor load that a piece of equipment actually draws load it could draw full load example motor of hp drives a constant hp load whenever it is on the motor load factor is then
Get MoreF80 feed size to the SAG mill, the final grind size and an estimate of the transfer size between the two mills This methodology was incorporated into a computer-based program for the sizing
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