The work index expresses the resistance of the material to grinding. It represents the kilowatt hours per tonne required to reduce the material from theoretically infinite feed size to 80 passing 100m Wills and Napierpercent -Munn, 2006. Bond devised several methods for predicting ball-mill and rod-mill energy requirements and
Get PriceThe work index expresses the resistance of the material to grinding. It represents the kilowatt hours per tonne required to reduce the material from theoretically infinite feed size to 80 passing 100m Wills and Napierpercent -Munn, 2006. Bond devised several methods for predicting ball-mill and rod-mill energy requirements and
Keywords Ball Mill Work Index, Bond Index, Grindability, Ball grinding, Ore testing, Grinding energy consumption, Physical and mechanical ore properties. Cite this Article Vladislav Valerevich Lvov and Leonid Sergeevich Chitalov, Comparison of the Different Ways of the Ball Bond Work Index
infinite size to a P80 size of 100 m, the Bond grindability test is conducted to determine the Bond work index Wi via Standard Bond Ball Mill which having the dimensions D L305 305 mm and a speed revolution of 70 min1 4, 5. Hardness values of crystalline minerals has strongly
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 1952 and modied in
and its correlation. As a fast method, the determination of the Bond index from the Hardgrove index by calculation is almost matching with measured Bonds work index. The Bonds work index of the above rock samples calculated from the Hardgrove index value has shown a
ball mill operation for further size reduction grinding. 2.3 Procedure for the Determination of Work Index Using Modified Bonds Method The modified Bonds method for determining work index of an ore involves the use of reference ore of known grindability. Experimental procedures were as follows 1.
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.
Bond Test WIs kWht Rod Mill Ball Mill 9.5 kWht.8 9 kWht . Bond Standard Circuit Work Index Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 m although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m to a rod
2017-1-7 The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability 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.
bond ball mill work index database jktech. Bond Ball Mill Index Test JKTech. 2019-11-14 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 10 kg of material crushed to nominally minus 10 mm is preferred.
Bond Rod Mill Grindability Test. Grinding Solutions can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from 4.75mm to 212 m. Abrasion Index Test
Chapter 3. Size Reduction and Energy Requirement - Scribd. Apr 19, 2010 ... Wj is known as the Bond Work Index and represents the work .... 3.3.4 Bond Ball Mill Standard Test The method for
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
Alternative Approaches for Determination of Bond Work Index on ... with the Bonds work index, Hardgrove index and Brittleness tests on six ... In recent, the brittleness testfriability value of bauxite, lizenithne, barite, marble, ... F80 is the size in microns at which 80 percent of the new feed to ball mill passes. Read More
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 ...
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 ...
Magdalinovic and Cumpujerovic 9 showed the fact that an approximate value of the ball-mill work index can be determined by doing just two grinding tests. Chongbo and Bingchen 10 studied away to simulate the calculation method of the Bond rod-mill work index.
In this regard calculation of work index of limestone made by standard Bond grindability test. Ball mill was employed to conduct the grinding test of seven different samples. Among all seven samples collected from the different faces of quarry, Bond work index of limestone Face4A results less than 20kwht, remaining 6 samples are marked as hard -
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 ...
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 ...
The work index can either be measured in the laboratory the Bond ball mill work index determination is a common example or it can be calculated from the operating performance of a milling ...
Bond F. C., Crushing Tests by Pressure and Impact, Trans AIME, Vol 169, 1947, pp 58-66. Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bonds Third Theory of Comminution to calculate net power requirements when sizing ball mills. Various correction factors may have to be applied.
2017-1-7 The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability 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.
bond ball mill work index database jktech. Bond Ball Mill Index Test JKTech. 2019-11-14 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 10 kg of material crushed to nominally minus 10 mm is preferred.