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  • Bond Work Index an overview ScienceDirect Topics

    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

  • (PDF) A quick method for bond work index approximate value

    This study aims to develop a new approach toward estimating the Bond ball mill work index (BBWI) by applying a series of kinetic grinding tests with Bond standard mill. is the only factor used

  • bond work index ball mill design and safety factors

    Ball Mill Design/Power Calculation. 2018/04/08 · Ball Mill Power/Design Calculation Example #2 In Example it was determined that a 1400 HP wet grinding ball mill was required to grind 100 TPH of material with a Bond Work Index of 15 ( guess what mineral type it is ) from 80 passing ¼ inch to 80 passing 100 mesh in closed circuit. Service Online

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

    Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75 106 microns.; The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 250 microns.; The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges

  • Bond Tests Mining SGS

    * Bond F. C., “Crushing Tests by Pressure and Impact”, Trans AIME, Vol 169, 1947, pp 58-66. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied.

  • Bond Index Ball Mill / Rod Mill BT 100 XL RETSCH

    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. The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work

  • Bond Work Index Procedure and Method

    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 Procedure used by a Professional Metallurgical Testing Laboratory.

  • Bond Ball Mill Index Test JKTech

    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.

  • Ball Mill Design/Power Calculation LinkedIn

    Dec 12, 2016· 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

  • Application of Operating Work Indices in Autogenous

    Ball Mill Wio, BWio 8.6 Circuit Wio, OWio 14.6 Bond Ball Mill Work Index, BWi, kWh/t 13.4 Bond Rod Mill Work Index, RWi, kWh/t 18.1 Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on

  • 20150505 Bond Efficiency-GMG-ICE-v1-r04 Determining the

    WiBM Bond Ball Mill Test Work Index (kWh/t) Wic Bond Impact Crushing Test Work Index (kWh/t) WioACT Actual Operating Bond Work Index determined from measurements on the circuit (kWh/t) ing design inefficiency factors into the reference Bond Stan-dard Circuit, assume 2.44 m diameter overflow mills

  • Determination of Bond Work Index of Lucky Cement

    In this regard calculation of work index of limestone made by standard Bond grindability test. Ball mill was employed to conduct the grinding test of seven different samples. Among all seven samples collected from the different faces of quarry, Bond work index of limestone Face4A results less than 20kwh/t, remaining 6 samples are marked as hard -

  • JKTech Laboratory Services JKTech JKTech

    For every Bond Ball Mill Work Index test carried out at JKTech, a standard report is issued. The report details the Bond test procedure method, and presents the results including F80, P80, Grindability and Work Index. Further interpretation of the results is available if required. Frequently Asked Questions Bond Ball Mill Work Index


    Bond Test WI’s (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ

  • A Method of C alculating Autogenous/ Semi-Autogenous

    rod mill work index has not been de ned as yet. The ball fi mill work index is con rmed at 16 kWh/t. The operating fi work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high ineffi ciency. This raises the point that, in some cases, the Bond EF4 oversize factor

  • Ball mills liming

    First, a Jar Mill grindability test requires a 5 lb. (2 kg) sample and produces a direct measured specific energy (net Hp-hr/t) to grind from the design feed size to the required product size. The second test, a Bond Work Index determination, results in a specific energy value


    T80 refers to the SAG product size in microns transferred to the ball mill circuit. The design procedure chosen by Davy used the SPI and Bond Ball Mill Work Index values to select the required specific energy for both the SAG mill and the ball mill. The other tests were used for comparison and to confirm the chosen result. Then, since used

  • Comparison of Ore Hardness Measurements for Grinding Mill

    standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu. (See reference 8 below). The comparison of these results gives context to how the various measurements relate to each

  • Procedure for determination of ball Bond work index in the

    The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to

  • Orway Mineral Consultants Canada Ltd. Mississauga, ON

    design to specify a feed and product size plus a hardness index to produce a specific energy value (kWh/t). submitted to the Bond ball mill work index test. The number of SAG mill revolutions required to grind the EF4 and EF5 factors for ball milling (Rowland, 1982).

  • Ore Type an overview ScienceDirect Topics

    The work index values of the Magdalinovic method agree with this average Bond work index because the method does not simulate the recycling of harder components into the mill charge. In a study for the design of a SAG-Ball mill grinding indicating that a safety factor of approximately 14% must be added to the power requirements for both

  • The Science of Comminution

    - Bond Grindability Tests 7 Efficiency Factors 7 Operating Work Index 8 Limitations of the Bond Test 9 Single Particle Tests 9 Bond Impact Test 9 Drop Weight Test 10 Mill Speed 10 AG Mills 10 SAG Mills 10 Rod Mills 10 Ball Mills 11 Linear and Speed Effects 11 Fines Correction 11

  • Geometallurgy Wikipedia

    The Bond ball mill work index test is thought to be additive because of its units of energy; nevertheless, experimental blending results show a non-additive behavior. [18] The SPI(R) value is known not to be an additive parameter, however errors introduced by block kriging are not thought to be significant .