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 ...
The procedure is as follows. 1 100 g each of samples of the ore under test and the reference ore were crushed and pulverized in the labor- ... Table 2 gives the sieve analysis result of the feed to ball mill of test ore columbite and Figure 1 is the graph ... Determination of Work Index of Gyel-Bukuru Columbite Ore in Plateau State, Nigeria ...
Dec 07, 2018 The 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 exponent determined by a calibration procedure.
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.
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 104106. samples of copper, leadzinc, manganese and iron ore in specified 13 L. Tavares, R. Carvalho, J. Guerrero, Simulating the Bond rod-mill grindability ...
Aug 01, 2005 The Bond work index is one of the most useful and interesting parameters used in designing grinding equipment. However, it must be obtained under restrained conditions, especially in regards to the Bond standard lab mill. The main objective of this study is to show how this index can be obtained using a Denver ball mill, which is present in most mineral processing laboratories. The
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.
8.1.3 Procedure 5 8.1.4 Calculations 5 ... WiBM Bond Ball Mill Test Work Index kWht Wic Bond Impact Crushing Test Work Index ... This Bond Efficiency determination applies to most brittle materials in their naturally occurring unscalped ...
Bond ball mill of DL 0.30480.3048 m dimensions at the speed of 70 rpm. The mill is loaded with 21.125 kg standard sized balls and 700 cm3 of grinded materials to under 3.35 mm. The test procedure takes from 7 to 10 grinding cycles with the required amount of material for whole procedure being approximately 10 kg. Once
Lastly, substituting all the values in equation 1 the Bond work index of the ore was determined to have a value of 41.38 kWhtone. The Bond work index, in addition to it as being the measure of the materials hardness or resistance to crushing and grinding, gives an important indication of the efficiency of the machine being used. The larger the Bond work index, the larger the consumption of ...
The Bond Work index is determined by a standardized procedure in which the material is crushed in stages to finer than 6 mesh 3,35 mm, and ground under specified conditions in a laboratory ball mill, ....
Andesite Bond Price List Ball Mill Work Index. Procedure for determination of ball bond work index in the 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 how to ball mill feed capacity calculate for ...
Procedure for the Determination of Work Index Using Modified Bonds Method The modified Bonds method of determine work index of an ore involves the use of reference ore of known grindability. ... The test and the reference ores from the laboratory ball mill machine were sized and each sieve fractions was weighed and the value noted as ...
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 grinding parameters
procedure to determine work index at length. Pongprasert et al. 1994 followed the procedure step by step using a lab ball mill to determine the Bond work index of feldspar ore from Nopphitam District, Thasala, Nakhon Si Thammarat, Thai-land. However, this procedure, when performed in a steady
Dec 04, 2020 The laboratory procedure for running a Bond ball mill work index test requires that the operator choose a closing screen sieve size. The instruction is to choose a sieve size that results in the ...
The recommendations are given for selecting the Bond mill revolutions in the first milling cycle for apatitenepheline, copper nickel and iron ore for the sieve size 106 m. An original procedure chart is proposed for choosing the determination method of the Bond Ball Mill Work Index for
Bond Work Index Testing Equipment and Procedures See Annexes A, B and C for Bond crushing, rod mill and ball mill test equipment and procedures. Accuracy of Comparative Circuit Work Index Efficiency Determinations This will follow in an addendum to this guideline Sub-topics will .
For overflow ball mills, the charge should not exceed 45 of the mill volume . For grate discharge mills, the charge should occupy about 50 of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,
Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a
21 CONCLUSIONS Continued In the present work, equations were also derived, giving zthe ball-mill power drawP as a function of its dimensions internal mill diameter D and length L, zthe ball-mill power drawP as a function of the feed D f mm and the product size d mm, the Bond work index w i kWhshort ton and the mill throughput T short tonh, zthe ball-mill dimensions D and L, when ...
Technical Information. Information about sample size, calibration, precision and accuracy. The SMC Test is the most widely-used comminution test in the world for AG amp SAG Mills, HPGRs and Crushers. The SMC Test was developed to provide a range of useful comminution parameters through highly controlled breakage of rock samples.
Jun 11, 2020 In the determination of ball mill work index 15 kg of representative ore at 100 3.35 mm is crushed to 100 3.35 mm Amtech, 2006 . The first grinding test is started with an arbitrarily chosen number of mill revolutions. At the end of each grinding cycle, the entire product is discharged from the mill and is screened on a test sieve.
Magdalimovic,1989. Numerically the work index is the energy required in Kwhshort ton to reduce a given material from theoretically infinite size to 80 passing size of 100 microns Onemine, 2009. The determination of work index using modified Bonds method can be compared to method of determining it by Berry and Bruce 1966.
Standard Operating Procedure For Hammer Mill Cleanin. Standard operation procedure for ball millops prosedure and cleaning of ball mill con vet standard operating procedure of ball mill standard operating procedure of ball mill, procedure for determination of ball bond work index in the it provides the bond ball mill work index which expresses ...
Starting from the rst-order grinding kinetics dened by means of the Bond ball mill, this paper discusses a simplied procedure for a rapid determination of the work index by just two grinding tests. The applicability of the simplied procedure has been proved on
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.
2.4 Bond work index test procedure Standard Bond Mill 305 mm diameter x 305 mm length was used for bond work index determination at Central Metallurgical Research and Development Institute CMRDI in Egypt as depicted in Fig.2 .Three hundred of representative sample was taken from the fresh sample-3.36mm and then
Oct 24, 2018 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 work index determination with a sepor batch ball . 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.
8 rows Jan 01, 2009 1.. IntroductionA Bond Ball Mill Work Index test is a standard test for determining the ...
Request PDF Procedure for determination of ball Bond work index in the commercial operations The Bond ball mill grindability test is run in a laboratory until a circulating load of 250 is ...
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 index by just two grinding tests. The applicability of the simplified procedure has been proved on
The preferred test procedure is a locked 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.
SIMPLIFIED BOND WORK INDEX DETERMINATION By R. O. Jauregui Kaiser Engineers International, Inc. 300 Lakeside Drive, Oakland, Ca. 94623, USA To design grinding circuits or evaluate their performance the Bond Theory of comrninution is used. Equation 1 is the mathematical statement of the Third Theory where W the energy input to the mill, kwht Wi Work Ind x, kwht P square