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Bond Work Index Procedure and Method 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 <1/2″ ore samples in a Ball Mill using a standard ball charge.
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, .... Linn-stunt: Lizenithne "1,6 I'llll.
Bond Work Index an overview ScienceDirect Topics. The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 3.36 mm (6 mesh) to product size in the range of 45-150 µm (325-100 mesh), thus determining the ball mill work index (WiB or BWi).get price
limestone : andesite = 25 : 75, limestone : andesite = 50 : 50, limestone : andesite = 75 : 25. The Bond work index determination. according to …
characterized using XRD, XRF, and electron and optical microscopy. A simulated test method for Bond ball mill work index (BWI) was used to perform the comminution test. The results showed BWI values vary from 5.67 kWh/t to 20.21 kWh/t. Examination of the possible correlations between BWI and the geological features
Hello, I was checking the Table of Ball Mill Index. Regarding the source 1 (Bond), I checked the source and the values are different. I thought the reason was that the values reported by Bond were in short ton instead of metric ton. However, I tried to calculate one value and I still get different results.
The Bond ball mill work index is one of the most commonly used grindability tests in mining, and is often referred to as the Bond work index.. The test is a … andesite bond ball mill work index - hotelpratappalace.in
A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). 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 3.35 mm, as required for the Bond Ball Mill Work Index test feed.
EXPERIMENTAL WORK Experiments carried out on samples of copper ore, andesite and limestone determined the value of Wi in a laboratory Bond ball mill with different aper- tures of test screen. Table I shows the values of Wi with the corresponding numerical values for Pk, P, F and G. Fig. 1 shows the relation G=f(~-~k) using the data from Table I.
Apr 8, 2018 The basic parameters used in ball mill design (power calculations), rod mill The power required to grind a material from a given feed size to a Get Price; Bond Work Index Formula-Equation - 911 Metallurgist. In the standard ball mill and rod mill grindability tests the In commercial grinding mills the operating work index is
W i =1.1× 44.5 P i 0.23 G bg 0.82 10/ P 80 − 10/ F 80 W i is the work index (kwh/t); P i, screen size at which the test is performed (106 μm); G bg, Bond's standard ball mill grindability, net weight of ball mill product passing sieve size P i produced per mill revolution (g/rev); P 80, sieve opening which 80% of the product passes (μm ...
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 (kWh/short ton) and the mill throughput T (short ton/h), zthe ball-mill …
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 passing size of <3.35 mm.
Test Method For Bond Ball Mill Work Index-ball Mill. Bond Index Ball Mill Rod Mill Bt 100 Xl Retsch. The grinding jar for the bond index rod mill is 12 x 24 in size and has a waveshaped 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 …
THE BOND WORK INDEX OF LIMESTONE AND ANDESITE Understanding the ore mixture grinding is of great importance in mineral processing. ... 19 Jun 2015 This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral .
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 ...
The test is conducted in the bond ball mill. Bond ball mill is one type of small laboratory mill used in the calculating grindability of all ores. The Bond work index is measured in terms of energy consumed for the grinding of ore in the Bond ball mill (Todorovic, 2017).
bond work index of limestone mill rotation calculation. Bond s Law work required using a large-size feed is proportional to the square root of the The work index for limestone is 12.74. kW P D mm D mm m pb pa 169.6) 50.8 1 3.175 1 of this 20kW is needed to operate the empty mill.
The test work program was carried out on those five ore samples obtained from the copper-porphyry orebodies. Total of 38 Bond work index tests, including duplicates, were done. Standard Bond ball mill test procedure were carried out on crushed (-3.35 mm / 6 mesh) material at different
Bond ball mill work index determinations for the composites ranged from 11.1 kWh/tonne to 13.5 kWh/tonne, with an average of 12.4 kWh/tonne. Based on these results the mineralization would be considered to have a moderate hardness from a rod and ball milling perspective.
The Bond work index of limestone and andesite mixtures. This paper investigates grinding of mineral mixtures with different grindabilities in the Bond ball mill. Understanding the ore mixture grinding is of great importance in mineral processing. The energy required for crushing and grinding is presented by the Bond work index and is determined ...
grindability index roller mill limestone in france. Limestone Bond Work Index Hammer Mill Mc Grindability is bonds work index which is defined as the resistance of the material to standard equation used by them for the ball mill work index bond work index is as follows23082 1 10 80 10 80 445 1P g p f w i bg i u 4 in designing and optimizing a ...
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 100μm (Wills and Napierpercent -Munn, 2006). Bond devised several methods for predicting ball-mill and rod-mill energy requirements and
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 …
Experiments were made on copper ore, andesite and limestone, and it was found that the change of the mass passing a test screen G could be related to the aperture size Pk of the screen by the formula: G=K 1 P k. The grinding-product size, P, in a Bond ball mill, which is given by the aperture size which passes 80% of the grinding product as a ...
Bond Test WI's (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ
Source 1: Table of materials reported by Fred Bond Source 2: Outokumpu, The science of comminution Source 3: Equipment and pipelines Source 4: Tenova Bateman mills (AG/SAG, Rod, Ball Mills) Source 5: Doering international Source 6: SME handbook of mineral processing, N.L Weiss Editor, NY 1985. Bond Work Index Tester
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 -3.327 mm.
Catalog excerpts. BALL MILLS, ROD MILLS & BOND INDEX MILLS Labtech Essa manufacture a range of metallurgical laboratory sized ball and rod mills to suit most applications. Included in the range is a Bond index mill which has specific application in establishing the grindability of ores (see sheet 2 of this data sheet) The ball and the rod mill ...
THE BOND WORK INDEX OF LIMESTONE AND ANDESITE MIXTURES** Abstract This paper investigates grinding of mineral mixtures with different grindabilities in the Bond ball mill. Understanding the ore mixture grinding is of great importance in mineral processing. The energy