# bond ball mill work index equation in wills   ### General work input function for sizing grinding ball mills General work input function for sizing grinding ball mills

Equations for power draft capacity and work input for predicting the performance of industrial grinding mills are derived based on torque measurements using a laboratory instrumented mill These derivations are based on mechanical principles and on the first order kinetics of the grinding process Rittinger’s Kick’s and Bond’s laws express work input as work index Wi times a particle Equations for power draft capacity and work input for predicting the performance of industrial grinding mills are derived based on torque measurements using a laboratory instrumented mill These derivations are based on mechanical principles and on the first order kinetics of the grinding process Rittinger’s Kick’s and Bond’s laws express work input as work index Wi times a particle   ### AMIT 135 Lesson 7 Ball Mills Circuits Mining Mill Orway Mineral Consultants Canada Ltd Mississauga ON L4W

Mill diameter Mineral density Work Index Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index A ie Wet Ball Mill = kg kWh = 016 A i 033 Dry Ball Mill = kg / kWh = A i 05 Replacement Ball SizeBond’s approach consists of determining the ore hardness characteristics or Work Index Wi via standardized laboratory testwork The full suite of Bond comminution tests provide the Ball Mill Work Index BWi the Rod Mill Work Index RWi the Crusher Ai   ### Chapter M MODELLING SIMULATION OPTIMIZATIONBond Work Index Energy equation Grinding

tumbling ball mill tests were performed The optimal values of parameters of Austin model in Equation 1 were estimated for laboratory measured selection function vs particle size by applying least square method and using SOLVER non linear Hello Everyone I am dealing with the calculation of Bond Work Index The flowsheet is attached I have calculated primary ball mill bond index but for the calculation of second ball mill bond index I got trouble In a bond energy equation where should I select   ### QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE VALUE Bond formula for the grinding balls size calculation

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 19/10/ 32 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   ### Work Index For Ball MillWork Index For Ball Mill

The Bond ball mill work index is one of the most commonly used grindability tests in mining and is often referred to as the Bond work index The test is a 39lockedcycle39 test where ground product is removed from test cycles and replaced by fresh feed Read The Bond ball mill work index is one of the most commonly used grindability tests in mining and is often referred to as the Bond work index The test is a 39lockedcycle39 test where ground product is removed from test cycles and replaced by fresh feed Read   ### Ball Mill Sizing With Bond Method Work Inde BaseBond Work Index Tests Grinding Solutions Ltd

Ball Mill Sizing With Bond Method Work Index Base 1 introduction a bond ball mill work index test is a standard test for determining the ball mill work index of a sample of ore it was developed by fred bond in and modified in jkmrc co this index is 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   ### Orway Mineral Consultants Canada Ltd Mississauga ON L4W Work Index Determination for High Pressure Grinding Rolls

Bond’s approach consists of determining the ore hardness characteristics or Work Index Wi via standardized laboratory testwork The full suite of Bond comminution tests provide the Ball Mill Work Index BWi the Rod Mill Work Index RWi the Crusher Ai 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   ### Operating work index is not the specific energy Geometallurgical Studies on Gold Ore for Enhanced Comminution

24/10/ 32 The Work Index is a fitted coefficient to Bond s equation given in the picture above The work index can either be measured in the laboratory the Bond ball mill work index determination is The Bond Ball Mill Work Indices of the blends tested were between 164 kWh/t and 96 kWh/t and a blend ratio of 85 fresh and 15 weathered was found to have a Bond Ball Work Index almost equal to the design value of 14 kWh/t   ### Relationships between comminution J energy and product size for Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes

test is stated in Bond The work index for a ball mill Wi is then calculated from the following equation 7 where P is the closing sieve size m Gbp is the grindability net g/rev F80 and P80 are the 80 passing size of the feed and the product mThe 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   ### Geometallurgical Studies on Gold Ore for Enhanced Comminution Testing method for ball mills Outokumpu Technology Oyj

The Bond Ball Mill Work Indices of the blends tested were between 164 kWh/t and 96 kWh/t and a blend ratio of 85 fresh and 15 weathered was found to have a Bond Ball Work Index almost equal to the design value of 14 kWh/t3/4/ 32 The empirical formula to calculate Bond Mill Work Index BWi is presented in the equation 2 BWi = 44 5 U 1 0 23 ⁢ ⁢ G bh 0 82 ⁡ 10 U 80 10 F 80 2 wherein U 1 is the passing size in micrometer of the test sieve G bh is the ball mill grindability and U 80 and F 80 are passing values in a mount of 80 in the sieve analysis for the product U 80 and feed F 80 in   ### CORRELATION BETWEEN BOND WORK INDEX AND Size Reduction and Energy Requirement ScienceDirect

The Bond s standard ball mill is used to determine the work index value of differ ent sampl 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 100 181 m If the breakage the 1/1/ 32 A Bond ball mill work index is then performed on the mill product for the design of SAG ball mill circuits This is important because it was found that there was a 1 15 kWh/t higher ball mill work index if the 335 mm ball mill test feed size is obtained by SAG mill grinding compared with crushing   ### Bond Tests Mining SGSA New Approach to the Calculation of Work Index and the

Bond Ball Mill Grindability Test The test determines the Bond Ball Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements Various correction factors may have to be applied W = Wi 10/√P 10/√F 22 Ball Mill Batch Process The mill dimensions D × L are × m and it is loaded with 65 kg steel balls between 25 and 32 mm in diameter The mill rotates on rolls and its frequency is set to 70 RPM Hertz corresponding to 85 of the P   ### C O N S U L T I N G L T D TECHNICAL MEMORANDUMA New Approach to the Calculation of Work Index and the

Bond ball mill work index Figure 2 Ball mill for determining Bond ball mill work index 1 For the purists there were two models in existence at the time the Von Rittinger and Kick models Neither of these gave results that matched the observations of specific22 Ball Mill Batch Process The mill dimensions D × L are × m and it is loaded with 65 kg steel balls between 25 and 32 mm in diameter The mill rotates on rolls and its frequency is set to 70 RPM Hertz corresponding to 85 of the P