bond method for ball mill work index test in india

Jun 06 2015 · 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 12″ 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

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 FC Bond Work Index Test Ball Mill was designed by F C Bond for use in determining the Bond Index a measure of grindability and power required for grinding applications The FC Bond Mills are used in laboratories throughout the world A copy of Fred C Bond’s Method of Crushing and Grinding for determination of the Bond Index is included with each mill

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 1952 and modified in 1961 JKMRC CO 2006 This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling for estimating the energy required

This knowledge is essential to define the required ball mill layout and production capacity In order to perform the Bond Index Test successfully it is necessary to use precrushed sample material as defined below Module Ball Mill Minerals precrushed to 335 mm and sieved Drillcore precrushed to 335 mm and sieved Half Drillcore precrushed to 335 mm and sieved The Bond Index conforming ball

Therefore the work input is given by 10 10 W Wi 7P7F1 Where W the energy input to the mill kwht Wi Work Index kwht P square sieve opening which 80 of the product passes microns F square sieve opening which 80 of the feed passes microns Equation 1 is the mathematical statement of the Third Theory or the Bond equation

WiBM Bond Ball Mill Test Work Index kWht Wic Bond Impact Crushing Test Work Index kWht WioACT Actual Operating Bond Work Index determined from measurements on the circuit kWht WiRM Bond Rod Mill Test Work Index kWht WiSTD Standard Circuit Bond Work Index expected or designed used for circuit design Specific energy requirement at

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 Where W Net power consumption in kWht Wi Bond work index either Imperial or Metric units

The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test Its value constitutes ore characteristic and is used for industrial

Jul 30 2020 · An improved method using less mass compared to the Bond Ball Mill Work Index test The JK Bond Ball Mill JKBBM test is a locked cycle grindability test conducted using a standard laboratory Bond Ball Mill with the same steel ball charge and material feed size 100 passing 335 mm as the Bond Ball Mill Work Index test The test requires approximately 50 less material than the Bond Ball