The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of 0.45 in the 100 m to 200 m size range, not the 0.50 exponent empirically measured by F. Bond. The work index increase between 100 m and 76 m is due to a porphyritic grain size that causes a spike in energy
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 ...
EF5BM P8010.3 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 m from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 m to ball
perspective with bond work index as the method does not stimulate recycling harder metal components into the mill charge. However, the work index obtained using the standard bond tests are shown that weighting of the work index is leveraged towards the harder component due to
Mar 26, 2020 The F. Bond ball mill We continue to consider the methods of grinding process planning based on the calculations of different energy indexes. In this article, we are going to consider the methodology for calculating index, which has a direct impact on the choice of SAG mills when engineering the grinding process. Wi is the ball grinding work index. It is used to calculate the
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
units such as crushers and grinding mills, is ores work index. The work index, wi, presents the ore grindability, and is used in Bond formula to calculate the required energy. Bond has defined a specific relationship between some parameters which is applied to calculate wi, which are control screen, fine particles produced, feed and product d80.
Bond estimated the amount of wear in terms of kilograms per kWh based on the abrasion index A i.e. Wet Ball Mill bond 39 s rod mill for work index Oct 28 2019 .39 0.05 High Copper HC 1.93 8.9 4.64 Bond Abrasion Index and Bond Ball Mill Work Index testing.
Oct 20, 2020 What is Bond ball mill work index Abstract 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 comminution plants designing.
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.
rod mill work index has not been de ned as yet. The ball mill work index is con rmed at 16 kWht. The operating work index, though, is in the range of 21 kWht to 25 kWht showing high inef ciency. This raises the point that, in some cases, the Bond EF4
Bond Ball Mill Work Index, BWi, kWht 13.4 Bond Rod Mill Work Index, RWi, kWht 18.1 Table 1. Example of AGSAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability.
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 -
The first problem comes from the equation derived by Bond to calibrate a rod mill work index to the parameters of the rod mill tumbling test. The term in the calibrated formula that is affected by the liner is the grams therefore, the energy evolved per revolution of the laboratory mill.
ball mill efficiency mine-equipments. the operating work index and work index efficiency of rod and ball mill circuits. 5. 5. Ball Mills Mine Engineer.Com Ball Mills are generally used to grind material 14 inch and finer, down to the particle size of 20 to 75 microns. Get Price
Raw Bond Model. This is a SAG or AG mill plus ball mill model that estimates the specific energy consumption E SAG using the 1979 Barratt equation and the classical Bond work index equation including Rowland efficiency factors.The model allows a manual calibration factor on both equations CF SAG and CF ball, respectively.This formula usually gives higher total circuit specific energy ...
Bonds Work Index Ball Mill. Bond method for ball mill work index test 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 2006this index is widely used in the mineral industry for comparing the resistance of different materials to ball milling for estimating the ...
The Bond work index, Wi, is defined in a Bond ball mill on the samples of standard size 3.327 0 mm. In practice, it is possible to find materials of non-standard size that are finer than 3 ...
The Bond work index determination according to the standard Bonds 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 kWht P c test sieve mesh size m
how to calculate mill bond or work index. Bond Ball Mill Work Index, BWi, kWht 13.4 Bond Rod Mill Work Index, RWi, kWht 18.1 Table 1. Example of AGSAG Ball Mill Circuit Wio Calculations 1 2 ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability.
and ball milling. Upon comminution of the initial plants feed coarse crushing discharge up to ball milling I discharge, the conventional circuit is divided into three size ranges in ac-cordance with Table. Each size range has a specific Bond work index conditioned by the Bond theory. Extensive discussion has been focused for many years
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 .
Jan 01, 1989 INTRODUCTION The energy consumption for grinding, according to Bond 1961, is deter- mined by the formula 10 10 I The work index is determined by grinding experiments carried out in a labo- ratory Bond ball mill. Based on the results of grinding experiments, numerical values of the work index Wi are calculated according to the formula ...
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
Alsto Bond Index Ball Mill. Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index. This is empirical index determined by closed circuit grindability tests developed by F.C.Bond in the mid 1930s. It requires a specific 305mm diameter x 305mm ...
2.2. Ball Mill Batch Process The mill dimensions, D L, are 0.204 0.158 m and it is loaded with 6.5 kg steel balls between 25 and 32 mm in diameter. The mill rotates on rolls and its frequency is set to 70 RPM 1.667 Hertz corresponding to 85 of the critical frequency. The mill power is P 16.2 Watts,
The Bonds standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80 passing 100 m. If the breakage
Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8 dia. rod mill to 1 mm Closed circuit 8 dia. ball mill to P80 um The ore Test Work Index Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK ...
COMPARISON OF THE DIFFERENT WAYS OF THE BALL BOND WORK INDEX DETERMINING. IAEME, 2019. IAEME Publication. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER.
Dec 18, 2013 For P80s finer than 75 m, the Levin test, a modified Bond ball mill work index test, may be used to predict grinding performance. Signature Plots. No general work index formula governing energy use over a range of conditions, like the Bond equation for intermediate grinding, has yet been found for the fine grinding regime.
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 ball mill work index clinker. Rod mill limestone grinding mm to mm size wiersmaenzoonnlod mill limestone grinding 10 mm to0 mm size 20 tp h, the bond index ball mill rod mill bt 100 xl is used in the planning of, in a size range from 25 mm down to 21 mm whereas ball mill work index bwi is used, material feed size, 335 mm with ball module 1250 mm with rod module.
Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS. The concentrate weight recovery was in the order of 5060. Furthermore it may be observed that the Bond ball mill work indices for
You can also review the step-by-step Bond Work Index Test Procedure I posted here. See thisuseful summaryTable of Bond Work Index by Minerals. For any
Bond Work Index Formula-equation - Mineral Processing amp Extractive Metallurgy on2389xee0l0. ... IDOCPUB. Home current Explore Explore All. ... For any