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maximum size of ore in ball mill

Jul 26, 2017 Soft ore Work Index 13 = 100,000/90,000 = 1.1 kwh/t Hard ore Work Index 16 = 100,000/65,000 = 1.54 kwh/t. For the purposes of this example, we will hypothesize that the the crushing index of the hard ore with the increased energy input of 1.54 kw/t reduces the ball mill feed size to 6,500 micrometers

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  • THE OPTIMAL BALL DIAMETER IN A MILL

    THE OPTIMAL BALL DIAMETER IN A MILL

    Investigations were carried out in a laboratory ball mill having the size of DxL = 160x200 mm with a ribbed inside surface of the drum. The mill ball loading was 40% by volume, the rotation rate was equal to 85% of the critical speed. Balls were made from steel: S4146, extra high quality, having hardness 62 2 HRC according to Rockwell

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  • AMIT 135: Lesson 7 Ball Mills & Circuits – Mining

    AMIT 135: Lesson 7 Ball Mills & Circuits – Mining

    Ball Mill Design. A survey of Australian processing plants revealed a maximum ball mill diameter of 5.24 meters and length of 8.84 meters (Morrell, 1996). Autogenous mills range up to 12 meters in diameter. The length-to-diameter ratios in

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  • Ball Mill - an overview | ScienceDirect Topics

    Ball Mill - an overview | ScienceDirect Topics

    Generally, filling the mill by balls must not exceed 30–35% of its volume. Productivity of ball mills depends on drum diameter and the relation of drum diameter and length. Optimum ratio between length L and diameter D, L: D is, usually, accepted in the range 1.56–1.64

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  • Ball Mills - an overview | ScienceDirect Topics

    Ball Mills - an overview | ScienceDirect Topics

    Very large tonnages can be ground with these ball mills because they are very effective material handling devices. Ball mills are rated by power rather than capacity. Today, the largest ball mill in operation is 8.53 m diameter and 13.41 m long with a corresponding motor power of 22 MW (Toromocho, private communications)

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  • EFFECT OF BALL SIZE DISTRIBUTION ON MILLING

    EFFECT OF BALL SIZE DISTRIBUTION ON MILLING

    2.4 Effect of ball size 29 2.4.1 Empirical approaches 29 2.4.2 Probabilistic approaches 33 2.5 Abnormal breakage 36 2.6 Effect of ball mixture 37 2.6.1 Ball size distribution in tumbling mills 37 2.6.2 Milling performance of a ball size distribution 40 2.7 Summary 41 Chapter 3 Experimental equipment and programme 43

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  • maximum copper ore size for ball mill

    maximum copper ore size for ball mill

    The ball mill measured 0.305 m in diameter and 0.127 in length. It was driven by an asynchronous motor rated with power close to 10 kW. A schematic of the experimental laboratory ball mill used is shown in Fig. 3. 2.2 Sample preparation The copper-cobalt ore used in the actual test work was obtained from the feed to the

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  • The Three Types of Ball Mills - Minerallurgy

    The Three Types of Ball Mills - Minerallurgy

    Aug 21, 2021 The correct ratio of ball size to ore size is often determined by trial and error, primary grinding usually requiring a grade charge of 10-15 cm diameter balls, while secondary grinding requires 5-2cm. Charge Volume. The charge volume is about 40-50% of the internal volume of mill about 40% of this being void space

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  • Ball Mill Parameter Selection & Calculation - Power

    Ball Mill Parameter Selection & Calculation - Power

    Aug 30, 2019 Aug 30, 2019 The grinding mill’s production capacity is generally calculated based on the newly generated powder ore of less than 0.074 mm (-200 mesh). V — Effective volume of ball mill, m3; G2 — Material less than 0.074mm in product accounts for the percentage of total material, %;

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  • Optimization of Solids Concentration in Iron Ore

    Optimization of Solids Concentration in Iron Ore

    Jun 18, 2019 Consider the mass of material in a ball mill to be divided into n narrow size intervals with maximum size x1 and minimum size xn+1.The ith size interval, bound by xi above and xi+1 below, contains a mass fraction of material mi(t) at time t. A di erential mass balance for the ith size interval yields the kinetic model [9]: d[H mi(t)] dt = Si(t)H mi(t) + Xi1

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  • Ball Mill Maximum Ball Size

    Ball Mill Maximum Ball Size

    Simulation Of Size Reduction In Ball Mills And Dem. Mar 03, 2015 The mill with 30 cm in diameter and 30 cm in length and the test conditions are standardized, with a maximum ball size of 40 mm and an ore top size of 3.35 mm. With less than 300 balls, it poses no challenge in running the simulations, if only grinding media are included

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  • Calculate and Select Ball Mill Ball Size for Optimum Grinding

    Calculate and Select Ball Mill Ball Size for Optimum Grinding

    Aug 02, 2013 Based on his work, this formula can be derived for ball diameter sizing and selection: Dm = 6 (log dk) * d^0.5 where D m = the diameter of the single-sized balls in mm.d = the diameter of the largest chunks of ore in the mill feed in mm. dk = the P90 or fineness of the finished product in microns (um)with this the finished product is

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  • AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill

    AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill

    Ball Size vs. Grindability. It has been recognized that the grindability of an ore in a ball mill is a function of both feed and mill parameters: Work index, W i; Largest particle size and size distribution; Density of solids and slurry; Mill diameter; Rotational speed; Rowland and Kjos (1980) defined the largest ball size needed based on these

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  • ball mill calculation pdf richtig bewerben.eu - GodSend

    ball mill calculation pdf richtig bewerben.eu - GodSend

    Ball Mill Design/Power Calculation - Mineral Processing & . The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum ''chunk size'', product size

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  • maximum gold ore ball mill input size

    maximum gold ore ball mill input size

    Ball Mill In Gold Ore Beneficiation Mining. Several manufacturers have produced various types of gold ore ball mills to meet the requirements of users for the size output energy consumption etc. Different types of gold ore ball mill are different in barrel speed ball load barrel volume motor power and material size

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  • Maximum Production Of Mm Aggreggate In A Gold Ore Ball Mill

    Maximum Production Of Mm Aggreggate In A Gold Ore Ball Mill

    Feed Size, F100 300 mm Feed Size, F80 125 mm Ore SG 2.9 Required Mill Discharge Size, P80 Not defined Ball Charge 10 to 18% Total Charge 26% Design Bond Ball Mill WI (closing 106 microns) Refer Table 2 Design Bond Rod Mill WI (closing 1180 micron) Refer Table 2 Circuit Fresh Feed Rate - Nominal 1,500 tph Circuit Fresh Feed Rate - Maximum 1,750

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  • Maximum Size Of Copper Ore

    Maximum Size Of Copper Ore

    Coppermolybdenum ore. the figure above is a simplified flow sheet showing the basic steps involved in a copper mill producing the byproduct molybdenum. the crushed copper ore containing, for example, 0.75 cu and 0.015 mo is fed to the grinding circuit where water is added and the ore is ground to the proper size

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  • Optimization of Solids Concentration in Iron Ore Ball

    Optimization of Solids Concentration in Iron Ore Ball

    Jun 18, 2019 Consider the mass of material in a ball mill to be divided into n narrow size intervals with maximum size x1 and minimum size xn+1.The ith size interval, bound by xi above and xi+1 below, contains a mass fraction of material mi(t) at time t. A di erential mass balance for the ith size interval yields the kinetic model [9]: d[H mi(t)] dt = Si(t

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