The most widely used parameter to measure ore hardness is the Bond work index Wi. Calculations involving Bonds work index are generally divided into steps with a different Wi determination for each size class. The low energy crushing work index laboratory test is conducted on ore specimens larger than 50 mm, determining the crushing work index (Wi C, CWi or IWi (impact work index)).
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. Any screen size below 600m can be used for the testwork depending on your requirements. Bond Rod Mill Grindability Test
The Bond crushing work index test (sometimes called the impact work index test) is noisy, and the difference you observed is perfectly reasonable. The paper by Angove Dunne (1997) reports a standard deviation in crushing work index tests across laboratories as 4.5.
Bond Work Inde Equation For Jaw Crusher. Bond work index the bond work index is not solely a material constant but is influenced by the grinding conditions for example the finer the grind size desired the higher is the kwht required to grind to that size magdalinovic 38 measured the
BOND WORK INDEX The Bond Work Index of a material of its hardness or its resistance to crushing or grinding. This is sometimes referred to as the HandgroveGrindability Index based on the design of the rod mill. Objective The experiment aims to familiarize the students with the procedure for the determination of the Bond Work Index of a given ore.
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. Determining the
The Bond work index is regarded as one of the crushing resistance it can therefore be presumed that the Bond work index is correlated to the mechanical properties of materials 4. Literature review on impact crusher performance in relation to machine configuration and operational conditions, by experimental work and mathematical ...
Bond impact work index and abrasive Products. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Bond impact work index and abrasive, quarry, aggregate, and different kinds of minerals.
The F80 values used were derived using a methodology that relates the primary crusher, close side ... by up to 7-14% and that the Bond Ball Mill Work Index may be reduced by up to 3-9% depending ...
Work Index is the amount of energy required to do this work. It is a measurement of how hard the rock is and an expression of the resistance that a material has to crusher. Shown in the table below is typical Work Index, reflecting the different rock characteristics.
values. If the Bond work index is assumed to be proportional to the batch operating Bond work index, W. OCW. ccE ( 1 1,-1.o T M where c( proportionality constant E net specific energy provided during the batch test, (kwh/t) ( 3) If A oeE 10, the work index can be computed directly from A(-.. lJ -1.
Aug 24, 2021 Sandvik Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. . According to Bonds Third Theory of Comminution, the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent to the
Jul 30, 2020 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.
Bonds approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. The full suite of Bond comminution tests provide the Ball Mill Work Index (BWi), the Rod Mill Work Index (RWi), the Crusher Work
bauxite crushing bond work index crusher conveyor. The Bond work index and the grindability index can therefore be estimated from the mill, involves a sequence of crushing and grinding proDate 29 March 2004. 2 . Bond ball mill work index reduction after HPGR. Ore. Crusher. Read more
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 ...
Ammtec. Values of Bond crushing work index will vary from a 8 kWh/t for laterite hardcap through to 22 kWh/t for banded iron formation to 46 kWh/t for fresh greenstone.
Mechanical OperationsThe work index in Bonds law for crushing of solids has the following dimensions. KWh.m1/2/ton KWh/ton KW/ton No units (dimensionless) KWh.m1/2/ton. KWh/ton. KW/ton.
The Bond Work Index is calculated using the formula Andesite and limestone samples were prepared by crushing in a laboratory jaw crusher and roll crusher in a closed cycle with screening to size 100% -3.327 mm. Composite samples of andesite and limestone were prepared in ratios limestone andesite 25 75, limestone andesite 50 50 ...
Data of crusher work index Products. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Data of crusher work index, quarry, aggregate, and different kinds of minerals.
Work Index, Work Index Efficiency, Bond Work Index testing 4.INTRODUCTION AND BACKGROUND The Bond method allows for quantification and com-parison of relative energy efficiencies of most industrial comminution circuits. It is an essential tool for managing the important business (cost) of grinding. For early analyses of plant grinding ...
The Bond work index W i is used as a measure of grindability of an ore (Deniz, 2003 Wills and Napier-Munn, 2006). The work index expresses the resistance of the material to grinding. It represents the kilowatt hours per tonne required to reduce the material from
In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing AG and SAG mills. Ball mills Rod mills Crushers High Pressure Grinding Rolls (HPGR)
bond 26 2339 3 s rod mill for work index. 19.0 MINERAL RESOURCE AND . Table 18.3 Bond Crushing work index Results . power calculation of impact coal crusher based on bond work ...
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bauxite crushing bond work index crusher conveyor. Bond-work index (Wi), Hardgrove Grindability Index (HGI), Zeisel specific performed in water, liquor or acid and often at high temperature (e.g. bauxite grinding modeling of crushing and grinding, the dimensioning of mills and the testingBond ball mill work index reduction after HPGR ...
Bond work index for fly ash scribd Products. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, Bond work index for fly ash scribd, quarry, aggregate, and different kinds of minerals.
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 mill (circuit) product size of 1,000 m. W Total 2.32 4.77 7.09 very large size (FkWh/t of . 9.70 ...
specimen (Bond, 1947), and then the crusher work index (CWI) or impact work index is calculated. The test is generally performed on 20 rocks in the -76.2/50.8mm size fraction. One of the strengths of the test is its ability to measure the natural dispersion in the
XMGQ305 Grinding Bond Ball (Rod) Mill is mainly applied for testing the grinding work index of the material of every kinds of ores, slag, etc. Under the specific rotation speed for dry grinding, then screening the products, weighing, repeat operation several times, getting the grinding work index kWh/t. Technical Parameters
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Bond Work Index Procedure and Method. grinding cycles. The Bond Work Index is calculated using the formula 1,1 44,5 0,23,82(10 80 10 80) (1) where W i Bond work index (kWh/t) P c test sieve mesh size (m) G weight of the test sieve fresh undersize per mill revolution (g/rev) F 80 sieve mesh size passing 80% of the feed before ...
Bond Work Index (kWh/t) 14.4 11.2 JKDWT 35 45 HE NIVERSI OF QUEENSLAN . HE NIVERSI OF QUEENSLAN Morrel Power Prediction - Barrick existing plants ssthanl 0% ... Bond crusher work index (kWh/t) Bond rod work index (kWh/t) Bond ball work index (kWh/t) JK drop weight A*b JK drop weight Mpq SMC - DWi (kWh/m3) SMC - Mia SMC - Mih
The Coalition for Energy Efficient Comminution (CEEC) has been established and is supported by a broad range of mining sector companies keen to accelerate awareness, knowledge transfer and, by implication, improve energy and cost outcomes in the substantive area of comminution.
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