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µm Note that in order for no correction factor for ball mill product fineness to apply the ball mill circuit P80 should be no less than approximately 70 µm Bond 1962 This Bond Efficiency determination should not be applied to cir cuits with a P80 finer than approximately 70 µm without making qualifications 3.

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The first program conducted in 2014 focused on determining the most viable processes for extracting gold from the ore including bond ball mill work index gravity gold recovery flotation and

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The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill see Figure 3.10 a question arises as to whether this practice will alter the ball mill work index BW i of the material

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INTENSIFICATION OF BOND BALL MILL WORK INDEX TEST THROUGH VARIOUS METHODS V Lvov J Sishchuk L Chitalov Tuesday 12 September 2017 by Libadmin2017 References 17th International Multidisciplinary Scientific GeoConference SGEM 2017 sgem SGEM2017 Conference Proceedings ISBN ISSN 29 June5 July

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JK Bond Ball Mill Test Since its introduction in the 1960s the Bond Ball Mill Work Index BBMWi parameter has been extensively used in predicting ball mill power draw Use of Work Index Along with comminution circuit design the work index parameter is widely used in tracking mill performance Due to the age and lack of controls for the test

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The grinding balls diameter determined by the Bond formula has a recommendatory character and serves as a starting point for calculating the necessary proportion grinding media feeding a new mill More precisely adjust the ball load in the mill can only by industrial test performing.

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work index covering grinding of fine particles is labelled M ib Morrell 2008 M ia values are provided as a standard output from a SMC Test Morrell 2004 a whilst M ib values can be determined using the data generated by a conventional Bond ball mill work index test M ib is NOT the Bond ball work index M ic and M ih

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Ball Mill Instruction Manual PDF Ball Mill Diagram Sheet PDF The software to view and print Adobe Acrobat PDF is available for free from the Adobe website Follow the provided icon link to download Acrobat Reader 395 50 220/440v 3 phase 60 cycle 395 50X

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1 day ago You need a two stage solution first stage open circuit mill and then second stage closed circuit mill First stage will be broken into two parts as well you use a Bond rod mill work index for the coarse component of the ore 2.1 mm and the Bond ball mill work index

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The Bond rod mill work index is not as common as the Bond ball mill work index and there are two different variations on the mill apparatus.The SAGMILLING models expect a mill with a wave liner and is not compatible with mills using smooth liners .

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Bond ball mill work index C Wi Bond crusher work index D HPGR roll diameter m E sp net specific energy consumption kWh/t F HPGR hydraulic pressing force kN F 80 particle size at which 80 of particles pass in feed F SP 2HPGR specific pressing force N/mm L HPGR roll length m ṁ or m dot HPGR specific throughput constant ts/hm3

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of 2 series mesh size coarser than the plant ball mill circuit P80 If between standard mesh sizes the finer of the chose two Results of Bond ball mill tests conducted with closing screens of 75 µm or finer are to be treated with caution The Bond Work Index relationship has been noted to apply down

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C for coarse rocks 75 50 mm a rod mill work index Wi RM for intermediate sized particles 25 3 mm and a ball mill work index Wi BM for small particles <3 mm Ammtec 2000 Laboratory testwork is required to determine these Work Indices and each test requires carefully collected samples of rock that is representative of future mill

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The Bond Ball Mill Work Index BBWi test is carried out in a standardised ball mill with a pre defined media and ore charge The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stage crushed to 100 passing size of <3.35 mm.

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micrometers in size According to the Bond standard procedure the work index is determined by simulating a dry grinding in a closed circuit in the Bond ball mill to achieve 250 circulating load Bond 1949 1952 1961 The test is performed on a raw material approximately weighing 10 kg which coarseness is 100 3.327 mm.

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The Work Index Ball Mill is used to find Grinding work index referring to the grindability index of Ores it indicate the grinding difficulty of the material It is measured according to the principle that to calculate the grinding work index based on output of each revolution of the mill after the material is ground to a balanced state by the specified mill.

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3 STANDARD BOND TESTS The Bond s standard ball mill is used to determine the work index value of differ ent samples The Bond work index is defined as the kilowatt hours per short ton required to break from infinite size to a product size of 80 passing 100 µm If the breakage

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The Bond Index conforming rod charge consists of 6 rods of 1.25 diameter and 21 length 2 rods of 1.75 diameter and 21 length The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave shaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.

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Laboratory MillingRod Ball Mills including Bond Rod Ball Work Grindability Index MARC manufactures a wide range of laboratory ball rod mills and automated Bond rod ball mills with wave liners to suit most metallurgical laboratory applications.

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submitted to the Bond ball mill work index test The number of SAG mill revolutions required to grind the material to a P 80 of 1.7 mm is used to predict AG/SAG specific energy using quation 4 Correction E factors for feed size and pebble ing are applied to

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1 Predicting Mill Feed Specific Energy from Bond Ball Mill Work Index Tests at Olympic Dam Y Li1 V Liebezeit2 K Ehrig3 M Smith4 B Pewkliang5 and E Macmillan6 1 MAusIMM Senior Geometallurgist BHP Olympic Dam Adelaide South Australia 5000.

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Steel Ball Mills Lined Ball Mills Particle size reduction of materials in a ball mill with the presence of metallic balls or other media dates back to the late 1800 s The basic construction of a ball mill is a cylindrical container with journals at its axis The cylinder is filled with grinding media ceramic or metallic balls

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Work Index Ball Mill alluding to the grind ability list of Metals is utilized to demonstrate the granulating trouble of the material It is measured by a rule that to compute the work file ball plant in light of yield of every unrest of the factory after the material is ground to an adjusted state by the predetermined plan.

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8.3.2.2 Ball mills The ball mill is a tumbling mill that uses steel balls as the grinding media The length of the cylindrical shell is usually 1–1.5 times the shell diameter Figure 8.11 The feed can be dry with less than 3 moisture to minimize ball coating or slurry containing 20–40 water by weight.

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Ball mill is an idle tool for grinding many materials into fine powder and it is used to grind different kinds of row materials.There are two ways of grinding first is dry process and second is wet process It are often divided into tubular type and flowing type consistent with various sorts of discharging material.

Get Price### Investigation into the applicability of Bond Work Index

The Bond Work Index BWI or W i is defined as the calculated specific energy kW h/t applied in reducing material of infinite particle size to 80 passing 100 μm The higher the value for W i the more energy is required to grind a material in a ball mill .

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This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples These equation application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge. Below describes in general terms the Bond Work Index

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Wi Bond Work Index Ws Specific energy correction for size distribution kWh/t WiBM Bond Ball Mill Test Work Index kWh/t 3 KEYWORDS Autogenous Grinding AG Ball mill Bond Work Index Wi Comminution circuit High Pressure Grinding Rolls HPGRs Rod mill Semi Autogenous Grinding SAG Spe cific energy W 4 INTRODUCTION AND BACKGROUND

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Specification of the Bond s mill toget her with the experimental execution condi tions of the standard Bond s test are given in Table 1 Table 1 Bond s mill specification and grinding conditions Mill diameter D m cm 30.48 Mill length L m cm 30.48 Number of mill rotations in minutes n min 1 70 Mill balls weight M b kg 21.125

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in the Bond ball mill instrumented with a torque measuring device Different closing screen sizes were used in the locked cycle work to produce different size distributions of the mill hold up and the operating conditions were changed in the one size fraction experiments to obtain different power

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A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill s and the associated grinding circuit s Sample requirements A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred JKTech would stage crush the sample to minus 3.35 mm as required for the Bond Ball Mill Work Index test feed.

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