• Correction of Bond Ball Mill Work Index Test for Closing

    · The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis to another The proposed model consists of two components, the variable coefficient that is determined from a specific work index determination and a fixed exponent determined by a calibration procedure The model has the benefit of retaining the variability in hardness that is built into a

  • SIMPLIFIED BOND WORK INDEX DETERMINATION By: R O

    Gb Bond's standard ball mill grindability, net grams p of ball mill product passing sieve size P 1 produced per mill revolution The rest of the terms are defined as in Equation (1) The work index obtained following the standard Bond grindability test described above predicts the energy requirement for a 244 meter (8ft) inside liners diameter, prototype ball mill under the following

  • Bond Work Index FormulaEquation

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

    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 Establishing a series of

  • 预计阅读时间:5 分钟
  • limestone bond ball mill work index pdf Popular Education

    limestone bond ball mill work index pdf; limestone bond ball mill work index pdf Alternative Approaches for Determination of Bond Work Index on with the Bond''s work index, Hardgrove index and Brittleness tests on six In recent, the brittleness test/friability value of bauxite, line, barite, marble, F80 is the size in microns at which 80 percent of the new feed to ball mill

  • SIMPLIFIED BOND WORK INDEX DETERMINATION By: R O

    Gb Bond's standard ball mill grindability, net grams p of ball mill product passing sieve size P 1 produced per mill revolution The rest of the terms are defined as in Equation (1) The work index obtained following the standard Bond grindability test described above predicts the energy requirement for a 244 meter (8ft) inside liners diameter, prototype ball mill under the following

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

    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 Establishing a series of

  • Bond Grinding Circuit Efficiency

    Closed circuit 8’ dia ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK INDEX EFFICIENCY DETERMINATIONS! 10 2/20/2014 6 Example SAGBall Mill Circuit WI Efficiency Calculation • SAGball circuit F80 =

  • Table of Bond Work Index by Minerals

    Table of Bond Work Index by Minerals Post navigation Previous Next This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on ‘around the world sample’ You can find the SG of each mineral samples on the other table Source 1 Source 2 Source 3 Source 3 Source 4 Source 5 Source 6 Source 6 KWh/t Source 6; Avg Bond Work Index: kWh/t: kWh/t: kWh/sht: kWh/t: kWh/t:

  • USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE

    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 values are also provided as a standard output from a SMC Test ® (Morrell, 2009) The general size reduction equation is as follows (Morrell, 2004 b): f x f x 2 1 i i 4 2 W M x x 1 (1) where M i = Work index related to the breakage

  • Orway Mineral Consultants Canada Ltd Mississauga, ON

    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 17 mm is used to predict AG/SAG specific energy using quation 4 Correction E factors for feed size and pebble ing are applied to the AG/SAG specific energy, as well as specific crush energy adjustment from 17 mm to the mill transfer size T 80 using Bond’s Law

  • Relationships between comminution J energy and product

    Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS The concentrate weight recovery was in the order of 50–60% Furthermore it may be observed that the Bond ball mill work indices for the ore (Wi) varies from 146 to 209 kWh/t The relationship between the ore hardness and iron content presented

  • 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 310), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material

  • The Effect of Circulating Load and Test Sieve Size on The

    grindability, on the Bond ball mill grindability (G hg) and work index (W,) are investigated based on four samples of natural amorphous silica In the experimental studies, the relationships between the Bond work index with circulating load and test sieve size were examined I INTRODUCTION Currently, silica fume is widely used as a supplementary cementing material to enhance the strength and

  • Investigation into the applicability of Bond Work Index

    · Bond Work Index (BWI) & Hardgrove Grindability Index (HGI) tests for biomass & coal • BWI can predict the potential for mill choking of biomass in a tube and ball mill • HGI is a poor method of predicting grindability of biomass in vertical spindle mills • Pellets should be composed of predensified particles close to the target size •

  • A New Approach to the Calculation of Work Index and the

    The work index W i was defined by F Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns The calculation is based on the sizeenergy relationship 1,2 21 11 nn eC x , which for n = 05, x 1 = ∞ and x 2 = 100, by definition gives e ∞,100 = W i and consequently C = 10 W i In theory, for a given

  • GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY OF

    Test WI of circuit feed ore = 161 kWh/t (The Bond ball mill test Work Index of the ore, whichapplies over the size reduction range of this circuit) W = 3,150 kW / 450 t/h = 70 kWh/t The circuit’s Bond WI Ratio Eff = 161 / 144 = 112, or 112% This circuit is performing approximately 12% better than predicted by Bond, based on the average performance of the plant circuits that Bond

  • Work Index Determination for High Pressure Grinding Rolls

    cycle test akin to the Bond Ball mill work index determination The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement Without adequate piston movement there is little measurable energy used and therefore very little breakage The test procedure requires that the

  • Bond Grinding Circuit Efficiency

    Closed circuit 8’ dia ball mill to P80 um The ore Test Work Index = Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK INDEX EFFICIENCY DETERMINATIONS! 10 2/20/2014 6 Example SAGBall Mill Circuit WI Efficiency Calculation • SAGball circuit F80 =

  • The Effect of Circulating Load and Test Sieve Size on The

    grindability, on the Bond ball mill grindability (G hg) and work index (W,) are investigated based on four samples of natural amorphous silica In the experimental studies, the relationships between the Bond work index with circulating load and test sieve size were examined I INTRODUCTION Currently, silica fume is widely used as a supplementary cementing material to enhance the strength and

  • [PDF] Why is the Bond Ball Mill Grindability Test done the

    The Bond Ball Mill Grindability Test is a lockedcycle laboratory grinding test It provides the Bond Ball Mill Work Index which expresses the resistance of a material to ball milling This Index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding, and for ball mill scaleup The test has

  • Orway Mineral Consultants Canada Ltd Mississauga, ON

    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 17 mm is used to predict AG/SAG specific energy using quation 4 Correction E factors for feed size and pebble ing are applied to the AG/SAG specific energy, as well as specific crush energy adjustment from 17 mm to the mill transfer size T 80 using Bond’s Law

  • PDC & Mass Balance Flotation + CIL Rev A 2012 June 20

    Bond Work Index Ball Mill (Design) kWh/t 160 Testwork/Engineering Design Average Tonnage Rate (Each) t/h 1441 Calculations max tonnage rate mtph 1729 CAL/ENGINEERING DESIGN Solids/Pulp Density % 72 Engineering Design Feed Size, F80 µm 2,000 Engineering Design Product Size, P80 µm 150 Testwork/Engineering Design Ball Mill Recycle Load % 250 Engineering Design Mill Speed %

  • 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 310), a question arises as to whether this practice will alter the ball mill work index (BW i) of the material

  • SPECIFIC COMMINUTION ENERGY SMC Testing

    = Bond laboratory ball work index (kWh/tonne) P 1 = closing screen size in microns Gbp = net grams of screen undersize per mill revolution P = 80% passing size of the product in microns F = 80% passing size of the feed in microns Circuit Equipment Configurations – Although the model can be used for a very wide range of flowsheet combinations, it was decided that to keep the

  • prices of secondary impact crusher in south africa 2018 cement industry high hardness copper mine grinding ball japan crusher global portable limestone impact crusher price indonesia iron melting mills in ludhiana used construction machinery for sale in germany 150 tph crusher ujlona kuwait mining and construction company crushing production line manufacturer y equipos de fundici all kinds of stone crusher blue metal quarry sale tamilnadu 01 s cone crusher capacity grinding machine for pepper garlic ginger spinach zoonyee pe500 750 manually operated stone crusher copper mined in south africa point grinding machine working principle of ohe crusher clay grinding effect stone roller mill hammer mill what is the price of a limestone crusher costing methods for crusher in india costing methods mining quarrying for aggregates india hammer mill gujarat india zinc ash separation machine hartle platinum mines Ahuja Stone Crusher Manufacturer Delhi secondary rock mining mills Quarry Fo Sale Belgium production of magnesium sulfate from dolomite vertical cement mill ethiopia