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ball mill vs sag mill definition lesotho

Oct 12 2017 · 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 SAG mill is about 29 to 30 By friction and influence of tumbling balls inside rotating cylinder grinds the raw material to the required fineness
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  • Autogenous Grinding Semi Autogenous Grinding Circuits

    Semiautogenous plus ball mill has been the “work horse” of mills SAG vs Ball Mill Advantages AG SAG Mill Grinding Compared – Which is Best Grinding rods and balls can be obtained in uniform sizes weights and of a specified quality Their action in a mill can be reasonably predicted

  • Ball Charge and Grinding Efficiency Grinding

    If the ball charge rate is between 812 it will be SAG mill If it is more than this it will be ball mill SAG Mills effect is mainly crush the big ores and then use ball mill to grinding the small ores

  • Ball Mill Critical Speed Mineral Processing Metallurgy

    A Ball Mill Critical Speed actually ball rod AG or SAG is the speed at which the centrifugal forces equal gravitational forces at the mill shell’s inside surface and no balls will fall from its position onto the shell The imagery below helps explain what goes on inside a mill as speed varies Use our online formula The mill speed is typically defined as the percent of the Theoretical

  • Autogenous and SemiAutogenous Mills FLSmidth

    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 FullerTraylor SAGAG Mills range in size from 43m through 122m in diameter with powers as high as 28000 kW

  • A comparative

    above the nominal mill throughput Considering a mill runtime of 94 and a final P80 size of 180 micrometers the proposed circuit consists of a SAG mill 40 feet in diameter and 25 feet in length EGL with an installed gearless motor of 30 MW and two 28 feet diameter by 445 feet in length ball mills equipped with 22 MW gearless motors

  • CONGA THE WORLD’S FIRST 42 FOOT DIAMETER 28

    sizes The results of these studies showed that a single line 40 ft SAG mill circuit gave the best project economics Further work was followed up to optimize the 40 ft SAG mill size with the results showing that a slightly more expensive 42 ft SAG mill with equivalent power to the 40 ft SAG mill enhanced the project economics

  • Ball Mills vs Rod Mills

    When the mill is rotated without feed or with very fine feed the rods are in parallel alignment and in contact with one another for their full length New feed entering at one end of the mill causes the rod charge to spread at that end This produces a series of wedge shaped slots tapering toward the discharge end The tumbling and rolling rods expend most of their crushing force on the

  • Grinding mills for mining and minerals processing Metso

    Every mining operation has a unique grinding process Metso has experience of over 8000 grinding mills globally including manufacturing and delivering the largest SAGAG mills in the world Our experts welcome the opportunity to assist you with circuit and circuit control design as well as startup operation and optimization of your mill

  • Choosing a SAG Mill to Achieve Design Performance

    SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates Typical tests required to define a hardness variability function are given below in Figure 1

  • which is first ball mill or mill sag mill balls

    sag mill and ball mill SAG is an acronym for semiautogenous grinding 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 Get a Quote

  • Autogenous and SemiAutogenous Mills FLSmidth

    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 FullerTraylor SAGAG Mills range in size from 43m through 122m in diameter with powers as high as 28000 kW

  • A comparative

    above the nominal mill throughput Considering a mill runtime of 94 and a final P80 size of 180 micrometers the proposed circuit consists of a SAG mill 40 feet in diameter and 25 feet in length EGL with an installed gearless motor of 30 MW and two 28 feet diameter by 445 feet in length ball mills equipped with 22 MW gearless motors

  • CONGA THE WORLD’S FIRST 42 FOOT DIAMETER 28

    sizes The results of these studies showed that a single line 40 ft SAG mill circuit gave the best project economics Further work was followed up to optimize the 40 ft SAG mill size with the results showing that a slightly more expensive 42 ft SAG mill with equivalent power to the 40 ft SAG mill enhanced the project economics

  • Mill Critical Speed Determination

    Mill Critical Speed Determination The Critical Speed for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shells inside surface This is the rotational speed where balls will not fall away from the mills shell

  • TECHNICAL NOTES 8 GRINDING R P King Mineral Tech

    LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp5762 Gross power No load power Net power drawn by the charge 813 The net power is calculated from Net power KD25L e c Watts 814 In equation 814 D is the diameter inside the mill liners and Le is the effective length of the mill including the

  • SAG mill in French translation EnglishFrench Dictionary

    SAG mill translation in EnglishFrench dictionary en The invention relates to a double coating for SAG mills which allows installation and replacement times to be reduced and which is formed by a first liner part 3 consisting of a first steel plate 9 mounted on a first rubber base 11 and a second liner part 3 consisting of a second steel plate 10 mounted on a second rubber base

  • Optimization of mill performance by using

    Optimization of mill performance by using online ball and pulp measurements by B Clermont and B de Haas Synopsis Ball mills are usually the largest consumers of energy within a mineral concentrator Comminution is responsible for 50 of the total mineral processing cost In today’s global markets expanding mining groups are trying

  • Grinding mills for mining and minerals processing Metso

    Metso has experience of over 8000 grinding mills globally including manufacturing and delivering the largest SAGAG mills in the world Our experts welcome the opportunity to assist you with circuit and circuit control design as well as startup operation and optimization of your mill

  • Grinding Circuit an overview ScienceDirect Topics

    A typical SAGHPGRBall mill circuit suggested by Patzelt et al 6 is shown in Figure 96 where the pebbles from the SAG mill are crushed in the highpressure grinding rolls It is a general observation that SAG mills are helpful for grinding where wide variations in the grindability of ores are experienced

  • Gearless mill drives Grinding ABB

    ABB’s GMD is the most powerful mill drive system in the market to power semiautogenous SAG ball and autogenous AG mills This ’workhorse’ for grinding operations combines a robust servicefriendly and fit for purpose design to provide highest throughput reliability

  • The Selection and Design of Mill Liners MillTraj

    mills in the older plants that had many mills in parallel In fact this is generally still the case in the multistream plants where mill liner design and selection is only tackled on a cost consumables basis However the gains to be had through good liner design and selection are just as great as on the large SAG mills

  • Increase throughput and capacity in SAG mills

    SAG mills are the main workhorses in the majority of comminution circuits globally They need to be fed and kept working round the clock But challenges can arise when capacity is not optimised causing unnecessary downtime and liner wear leading to the one sound operators do not want to hear the sound of the mills standing still

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