The work index of a particular material is determined in the laboratory by conducting the standard Bond grindability test. Bond developed separate tests for the rod mill and the ball mill. The simplified test method described in this paper, which is used at Anaconda Research Center to approximate the work index, is an alternative procedure to ...
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The work index of a particular material is determined in the laboratory by conducting the standard Bond grindability test. Bond developed separate tests for the rod mill and the ball mill. The simplified test method described in this paper, which is used at Anaconda Research Center to approximate the work index, is an alternative procedure to ...
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) WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy requirement at the drive pinions. 3.KEYWORDS Work Index,
Oct 24, 2018 The Work Index is a fitted coefficient to Bonds equation given in the picture above. The work index can either be measured in the laboratory (the Bond ball mill work index determination is a...
Bond Work Index Ball Mill Design And Safety Factors. Bond work index ball mill design and safety factors ball mill grindability the test mesh used was 100 mesh p 1416 the bond work index w i was calculated from equation 2 w i 445p 1 023 x gbp 082 10p 80 05 05 10f 80 2 where f 80 is the size in m at which 80 percent of the new feed to ball mill passes
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 10kg of sample that has been stage-crushed to 100% passing size of 3.35 mm.
It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling. This happens after 710 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to procedural errors.
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 Index (BWI) is used for the range from 2.1 mm down to 100 m. Adjustment of
Cement Grinding Calculations In Ball Mills. calculaton Of circulating load In cement ball mill. ball mill designpower calculation.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 ...
The Bonds Ball-Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. This Index is widely used in the industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding and for ball mill scale-up. Utility. This Index is widely used in the mineral Industry for
Dec 04, 2020 Work index can change as a function of the product size of a Bond ball mill grindability test, which is controlled by the closing mesh size the test operator has
Jan 01, 2009 1.. IntroductionA 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 for grinding, and for ball mill ...
It provides the Bond Ball Mill Work Index which expresses the resistance of material to ball milling. This happens after 710 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to procedural errors. Starting from the first-order grinding kinetics defined by means of the Bond ball mill, this paper discusses a simplified procedure for a rapid determination of the work
Ball mill work index adjustment. The Bond ball mill work index test requires the operator to select an appropriate screen size to close the test. The procedure states that the closing screen size should be such that the product size of the test is the same as the expected product size of the operating plant.
Mill diameter Mineral density Work Index. Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index, A, i.e., Wet Ball Mill kg kWh 0.16(A i-0.015) 0.33 Dry Ball Mill kg / kWh 0.023A i 0.5 Replacement Ball Size
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) WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy requirement at ...
where CF is the Essbm calibration factor (in the Circuit Settings) for ball mill operating work index versus laboratory ball mill work index. A value of zero means use the Bond/Rowland SSBM formula to predict E ball, a value of -0.05 means use 5% less than Bond/Rowland SSBM formula to predict E ball. CF is a negative number if Wi O is less than ...
Numerically, the work index is the energy required in kwh/t to reduce a given material from theoretically infinite feed size to 80% passing 100 microns. The work index of a particular material is determined in the laboratory by conducting the standard Bond grindability test. Bond developed separate tests for
Bond Work Index Ball Mill Design And Safety Factors. Bond work index ball mill design and safety factors ball mill grindability the test mesh used was 100 mesh p 1416 the bond work index w i was calculated from equation 2 w i 445p 1 023 x gbp 082 10p 80 05 05 10f 80 2 where f 80 is the size in m at which 80 percent of the new feed to ball mill passes
Cement Grinding Calculations In Ball Mills. calculaton Of circulating load In cement ball mill. ball mill designpower calculation.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 ...
Oct 18, 2018 Bond Work Index (BWI) Test. Celtest have the capability to carry out the Bond Work Index (BWI) Test in accordance with EPRI Report CS3612 FGD Chemistry and Analytical Method Handbook, Volume 2 . The BWI is used to estimate the required mill power per ton of product (Specific Energy). The specific energy requirements and the desired production rate determine the mill length and diameter.
The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill apparatus.The SAGMILLING.COM models expect a mill with a wave liner , and is not compatible with mills using smooth liners .
Bond Test WIs (kWh/t) Crushing16.0 Rod Mill 14.5 Ball Mill 13.8 Bond Standard Circuit Work Index W1 16.0 x (10 / SQRT 16,000) (10 / SQRT 165,000 ) 0.9 kWh/t
Jan 01, 2009 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 for grinding, and for ball mill scale-up.
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 ball milling. This happens after 710 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible to ...
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,
Oct 15, 2015 Bond Work Index (BWI) amp Hardgrove Grindability Index (HGI) tests for biomass amp 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 pre-densified particles close to the target size.
Oct 18, 2018 Bond Work Index (BWI) Test Celtest have the capability to carry out the Bond Work Index (BWI) Test in accordance with EPRI Report CS3612 FGD Chemistry and Analytical Method Handbook, Volume 2 . The BWI is used to estimate the required mill
Provided by data from the standard Bond ball work index test using the following equation (Morrell, 2006) ( ) M 80 ( ) 80 0.295 1 80. 80 18. 18 ib f p P Gbp p f. f f (6) where . M. ib fine ore work index (kWh/tonne) P. 1 closing screen size in microns . Gbp net grams of screen undersize per mill revolution . p. 80 80% passing size of the product in microns . f 80
measured, and the Bond work index (BWI) is calculated as follows Where P1 is the aperture of the closing screen in microns, and F 80 and P 80 are the 80% passing sizes of the test feed and product. The world relies widely on the ball mill work index for the design and analysis of
For the batch tests the mill is loaded and rotates for a time . t (sec) consuming energy (Joules). This energy corresponds to a specific energy . e E/m (Joules/ kg), where . m. is the mass (kg) of the sample. Finally the product is wet screened to find the size . d. 80. EPt 2.3. Rod Mill Batch Process . The mill dimensions, (D L), are 0.204 0.3 m and it is
Bond Work Index Ball Mill Design And Safety Factors. Bond work index ball mill design and safety factors ball mill grindability the test mesh used was 100 mesh p 1416 the bond work index w i was calculated from equation 2 w i 445p 1 023 x gbp 082 10p 80 05 05 10f 80 2 where f 80 is the size in m at which 80 percent of the new feed to ball mill passes
Cement Grinding Calculations In Ball Mills. calculaton Of circulating load In cement ball mill. ball mill designpower calculation.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 ...
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
A bond ball mill work index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits 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 335 mm as required for the bond ball mill work index test feed
micrometers in size. 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, 1949, 1952, 1961). The test is performed on a raw material approximately weighing 10 kg, which coarseness is 100% -3.327 mm.
It is measured according to the principle that to calculate the grinding work index based on output of each revolution of the mill after the material is ground to a balanced state by the specified mill. This ball mill, also called mill for measuring bond work index, is a key device for measuring grinding work index. It is widely used by teaching and researching departments for grindability test of ores raw materials for