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Comments of bond s work index ball mill inner liners design
Bond Work Index an overview ScienceDirect Topics
Ball mill design requires a Bond work index, BWi, for ball mills at the correct passing size; SAG mill design requires an appropriate SAG test, for example, SPI (Chapter 5). Flotation design needs a valid measure of kinetics for each sample, including the maximum attainable recovery and rate constants for each mineral (Chapter 12).
bond's work index ball mill inner liners design
bond s work index ball mill inner liners design 2011 the ball mill and full in designing and optimizing a milling circuit using bond ball mill work index Know More Work Index Determination for High Pressure Grinding
SIMPLIFIED BOND WORK INDEX DETERMINATION By: R. O
The work index obtained following the standard Bond grindability test described above predicts the energy requirement for a 2.44 meter (8ft.) inside liners diameter, prototype ball mill under the following conditions: 1. Wet closed circuit grinding. 2.
Bond Work Index Formula-Equation
Basic EquationsSize Distribution and Exposure RatioEquations For Work Index VariationsWork Index and Crack EnergyThe basic work index equation is:W = 10 Wi/√P – 10 Wi/√F(1)where W is the work input required in kilowatt hours per short ton to grind from 80% passing F microns to 80% passing P microns, and Wi is the work index, or the grinding resistance parameter. It represents the energy input required in kilowatt hours to reduce a short ton from theoretSee more on 911metallurgistPublished: Jul 15, 2013
(PDF) A quick method for bond work index approximate value
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.
Technical Note Why is the Bond Ball Mill Grindability Test
The Bond Ball Mill Grindability Test (Bond, 1952, 1961) gives the Bond Ball Mill Work Index. This Index expresses the resistance of a material to ball milling; the higher the value of the Bond Ball Mill Work Index, the more difficult it is to grind the material using a ball mill. This Index is widely used in the mineral industry for:
SIMPLIFIED BOND WORK INDEX DETERMINATION By: R. O
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 2.44 meter (8ft.) inside liners diameter, prototype ball mill under the following
(PDF) A quick method for bond work index approximate value
Geometry of mill liner . smooth . Grinding type . dry . V ore, cm 3. 700. This study aims to develop a new approach toward estimating the Bond ball mill work index (BBWI) by applying a series
JK Bond Ball Mill Test JKTech
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,
How to Size a Ball Mill -Design Calculator & Formula
Apr 08, 2018· The power calculated on using equation 1, (Bond, 1961; Rowland and Kjos, 1978), relates to: 1) Rod milling a rod mill with a diameter of 2.44 meters, inside new liners, grinding wet in open circuit. 2) Ball milling a ball mill with a diameter of 2.44 meters, inside new liners
Ball Mill Design [dvlr8171xjnz] idoc.pub
a=Bond's Work Index vs Grindability From Table (III) 1.21 CLICK HERE TO VIEW TABLE(III) b =Correction Factor For Fine Grinding From Table (ii) 1.2 CLICK HERE TO VIEW TABLE (II) c = Correction Index For Mill Type From Table (I) 1.3 CLICK HERE TO VIEW TABLE(I) v = Volume of Mill in m3 30.9171 M3 d1= Diameter of Mill 2.8 t = Mill Liner thickness 0
THE BOND WORK INDEX OF LIMESTONE AND ANDESITE
The Bond work index determination according to the standard Bond's test is done on all these samples with compara-tive sieve size of 74, 105 and 150 microns. The Bond Work Index is calculated using the formula (Bond, 1961): (√ √) (1) where: W i Bond work index (kWh/t); P c test sieve mesh size (µm); G weight of the test sieve
The Effect of Circulating Load and Test Sieve Size on The
puritic ore, calculated Bond work index is higher with different circulating loads, the Bond work index is higher with lower circulating loads. The purpose of this study to determine the effects of circulating load (CL) and test sieve size (P;) on the Bond ball mill grindability (Ght,) and work index (W,) with natural amorphous silica.
C O N S U L T I N G L T D TECHNICAL MEMORANDUM
EF5BM=[ P80+10.3 1.145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a “single-stage ball mill” calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 µm to ball
Cement grinding optimisation ScienceDirect
Nov 01, 2004· Bond’s equation describes the specific power required to reduce a feed from a specified feed F 80 to a product with a specified P 80: (1) W m = W i 10 P 80-10 F 80 where: W m. mill specific motor output power (kWh/t) W i. Bond ball mill work index (kWh/t) P 80. sieve size passing 80% of the mill product (μm) F 80. sieve size passing 80% of
How to Formulate an Effective Ore Comminution
Oct 14, 2009· To characterize rock breakage in rod mills, Bond developed a dry lockedcycle test that uses a 12- -in.-diameter, 24-in.-long batch mill with wave liners and running at 46 rpm (see Figure 3 ). The mill is mounted on a rocker, which allows for the mill to be tilted up by 5° to the horizontal and down during the by 5° course of the test.
(PDF) Rapid determination of Bond rod-mill work index by
Shahsavari, Procedure for determination of Bond ball work The grindability experiments was carried out on the four typical index in the commercial operations, Min. Eng. 22 (2009) 104–106. samples of copper, lead–zinc, manganese and iron ore in specified [13] L. Tavares, R. Carvalho, J. Guerrero, Simulating the Bond rod-mill grindability
Tubular Ball Mills ScienceDirect
Jan 01, 2016· Thus if d B is the ball diameter (mm), W i is the work index of the material (kWh/t), F 80 is the feed size (80% passing size in micrometre) and ϕ C is the fraction of the critical speed of the mill, then the largest size of the ball may be estimated by (7.16) d B = 25.4 F 80 k 0.5 ρ S W i 100 ϕ C 3.281 D 0.5 0.33 in mm where
Kinetic grinding test approach to estimate the ball mill
Kinetic grinding test approach to estimate the ball mill work index 343 The W i parameter is obtained from Bond’s ball mill grindability test (Bond, 1961). This test is performed according to the standard Bond procedure which proposed model is presented in Eq. 1.
Simulation of Size Reduction in Ball Mills and DEM
In the case of ball mills, this is certainly not straightforward. Let´s consider a simple example: the most common tumbling mill test used in the lab is the Bond ball mill grindability test, used for nearly 70 years to determine the Bond work index, which is a number used to estimate how hard it will be to grind the material of interest.
JK Bond Ball Mill Test JKTech
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,
The Effect of Circulating Load and Test Sieve Size on The
puritic ore, calculated Bond work index is higher with different circulating loads, the Bond work index is higher with lower circulating loads. The purpose of this study to determine the effects of circulating load (CL) and test sieve size (P;) on the Bond ball mill grindability (Ght,) and work index (W,) with natural amorphous silica.
Kinetic grinding test approach to estimate the ball mill
Kinetic grinding test approach to estimate the ball mill work index 343 The W i parameter is obtained from Bond’s ball mill grindability test (Bond, 1961). This test is performed according to the standard Bond procedure which proposed model is presented in Eq. 1.
THE BOND WORK INDEX OF LIMESTONE AND ANDESITE
The Bond work index determination according to the standard Bond's test is done on all these samples with compara-tive sieve size of 74, 105 and 150 microns. The Bond Work Index is calculated using the formula (Bond, 1961): (√ √) (1) where: W i Bond work index (kWh/t); P c test sieve mesh size (µm); G weight of the test sieve
Tubular Ball Mills ScienceDirect
Jan 01, 2016· Thus if d B is the ball diameter (mm), W i is the work index of the material (kWh/t), F 80 is the feed size (80% passing size in micrometre) and ϕ C is the fraction of the critical speed of the mill, then the largest size of the ball may be estimated by (7.16) d B = 25.4 F 80 k 0.5 ρ S W i 100 ϕ C 3.281 D 0.5 0.33 in mm where
Cement grinding optimisation ScienceDirect
Nov 01, 2004· Bond’s equation describes the specific power required to reduce a feed from a specified feed F 80 to a product with a specified P 80: (1) W m = W i 10 P 80-10 F 80 where: W m. mill specific motor output power (kWh/t) W i. Bond ball mill work index (kWh/t) P 80. sieve size passing 80% of the mill product (μm) F 80. sieve size passing 80% of
C O N S U L T I N G L T D TECHNICAL MEMORANDUM
EF5BM=[ P80+10.3 1.145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a “single-stage ball mill” calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 µm to ball
Simulation of Size Reduction in Ball Mills and DEM
In the case of ball mills, this is certainly not straightforward. Let´s consider a simple example: the most common tumbling mill test used in the lab is the Bond ball mill grindability test, used for nearly 70 years to determine the Bond work index, which is a number used to estimate how hard it will be to grind the material of interest.
OPTIMISATION AND CONTINUOUS IMPROVEMENT OF
Figure 2 Summary of estimated UCS from Point Load Index measurements (Jan 2007) Metallurgical Hardness Testing A summary of the Bond Ball Mill Work Index (BWi) results since 2002 is shown in Table 1. These results appear to be quite consistent with M1 reporting a BWi of around 10kWh/t (relatively soft) and M4/M4A between 12 and 14kWh/t
Ball Mill Charge Calculation Per Size
Ball Mill Design/Power Calculation. 2021-1-22 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, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum ‘chunk size’, product size as P80 and maximum
Measurement of electrical energy consumption in a Bond
The Bond ball mill test is used to determine the so-called standard work index, which is defined as the specific energy consumption (in kWh/t) required to reduce a material from a notional
Bond Work Asindex Ball Mill Musikschule Bad Dürrheim
Determination Of Bond Ball Mill Work Index Of. Bond ball mill work index SKD.2020-5-9cleaning and storing of ball mill charge after the bond work index procedure is done the sample was crushed to 100 passing 6 mesh 3.35mm from this a 700 cc volume was measured and weighed to be used as feed for the bond mill.read more. Live Chat
Bond Work Index Tests Grinding Solutions Ltd
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. Any screen size below 600µm can be used for the testwork depending on your requirements. Bond Rod Mill Grindability Test
Optimisation Of The Ball Charge In Mills For Cement Grinding
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