### Procedure for determination of ball Bond work index in the ...

The work index (Wi) is calculated in a laboratoryscale ball mill with Bond equation. The Bond work index has been widely used in designing fullscale mills but the Bond test is rather complex, lengthy susceptible to procedural errors and this is why attempts have been made to abbreviate and simplify Bond test procedure (Weiss, 1985). 2.

Get Price### Calculate Top Ball Size of Grinding Media Equation Method

Calculate Top Ball Size of Grinding Media FRED C. BOND Equation Method Previous Next Although it was developed nearly 50 years ago, Bond ‘s method is still useful for calculating necessary mill sizes and power consumption for ball and rod mills.

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This equation reverts to the Bond equation (Equation ) by taking the value of B as 12 and integrating; thus, () E = k 1 P 6 12 − 1 F 6 12 which in effect is the Bond equation. Bond’s original work on establishing the energy for size reduction was established in a m (8 foot) internal diameter wet grinding overflow type ball mill.

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2006). The laboratory benchscale SAG mill reproduces operating conditions of a commercial SAG mill, in a closed circuit dry grinding environment. The ground product for the laboratory SAG mill is then submitted to the Bond ball mill work index test. The number of SAG mill …

Get Price### Comprehensive derivation of bondvalence parameters for ...

twoparameter equations; (3) the equation of Brown Altermatt (1985) is sufﬁciently good that use of any of the other equations tested is not warranted. Improved bondvalence parameters have been derived for 135 ions for the equation of Brown Altermatt (1985) in terms of both the cation and anion

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REGARDING % OF GRINDING MEDIA IN THE MILL Page 1 of 2. Mar 11, 2014· re REGARDING % OF GRINDING MEDIA IN THE MILL Dear, you may used for just reference point 113 AND 126 ARE COME FOR CALCULATION FROM GRINDING CHART VS GRINDING VOLUME IN BALL MILL AS A CONSTANT FOR CHART GKS Reply [24/7 online]

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Dec 12, 2016· Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch (6350 ...

Get Price### 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. Below describes in general terms the Bond Work Index Procedure used by a Professional Metallurgical Testing Laboratory.

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Hello Everyone, I am dealing with the calculation of Bond Work Index. The flowsheet is attached. I have calculated primary ball mill bond index but for the calculation of second ball mill bond index I got trouble. In a bond energy equation, where should I select tonnage ? and where should I pick

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JKTech Laboratory Services Bond Ball Mill Index Test (BRMWI) A Bond Ball Mill Index Test (BBMWI) is a standard test for determining the Ball Mill Work Index of a sample of ore. The BBMWI is a measure of the resistance of the material to crushing and grinding. It can be used to determine

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Bond Ball Mill Index Test Measuring ore grindability in balls mills The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions It is a 'locked cycle' test conducted in ....

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Sep 04, 2016· Two worked examples are considered to illustrate the computation of energy consumption in comminution using Kick’s, Rittinger’s and Bond’s laws. The worked examples on open as well as close ...

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Bond Ball Mill Work Index, BWi, kWh/t Bond Rod Mill Work Index, RWi, kWh/t Table 1. Example of AG/SAG 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. Mill operators have long used operating ...

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Bond’s original work on establishing the energy for size reduction was established in a m (8 foot) internal diameter wet grinding overflow type ball mill. Doubt is now expressed whether the derived empirical equation is applicable to high pressure roller crushers where …

Get Price### Calculation of energy required for grinding in a ball mill ...

Calculation of energy required for grinding in a ball mill. Int. J. Miner. Process., 25: 4146. The Bond work index, Wi, as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding product.

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Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75 – 106 microns.; The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150 – 250 microns.; The CenterPeriphery Discharge mill has feed reporting from both ends and the product discharges ...

Get Price### A New Approach to the Calculation of Work Index and the ...

A New Approach to the Calculation of Work Index and the ... The same mill is used for the semi continuous grinding tests which is similar to the Bond test but with the exist ing mill of known power. After time the mill product is t wet screened at a predetermined screen size. From the

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Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied. The test is a closedcircuit dry grindability test performed in a standard rod mill.

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Energy and temperature analysis in grinding Rowel, Morganl, ... For example, where the grinding power is 25 watts per cubic millimetre of material removed per second for a particular workpiece material, the specific energy is 25 J/mm3. ... A wheel with a hard bond…

Get Price### FM 306: SIZE REDUCTION AND SIEVING

FM 306: SIZE REDUCTION AND SIEVING ... intermediate or fine grinding. Ball mill is a metal cylinder which rotates about its horizontal axis. The coarse material charged along with the metal balls breaks to fine powder by impact of metal ... Bonds law is often written in terms of the work index (Wi) as,

Get Price### MODELING THE SPECIFIC GRINDING ENERGY AND BALLMILL …

2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP Ballmill scale up (Bond’s Law)Data: zBond work index w i zFeed D f and product d size (both 80% cumulative passing) Result: The specific grinding energy w Mill power draw P = wT, where T the mill capacity Mill dimensions (from Tables or charts)

Get Price### Ball Mill Design/Power Calculation

The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum ‘chunk size’, product size as P80 and maximum and finally the type of circuit open/closed ...

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Dec 18, 2013· 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. Instead, the worktoP80 curve is determined in the laboratory for each case.

Get Price### Development of size reduction equations for calculating ...

article{osti_1328345, title = {Development of size reduction equations for calculating power input for grinding pine wood chips using hammer mill}, author = {Naimi, Ladan J. and Collard, Flavien and Bi, Xiaotao and Lim, C. Jim and Sokhansanj, Shahab}, abstractNote = {Size reduction is an unavoidable operation for preparing biomass for biofuels and bioproduct conversion.

Get Price### Relationships between comminution J energy and product ...

determination of the work index for ball and rod mills in 1952 and modified it in 1961. The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250% circulating load. The standard procedural outline of the test is stated in (Bond) 1961. The work index for a ball mill, Wi, is then calculated from the following ...

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using the Bond equation (1961). For every Bond Rod Mill Work Index test carried out at JKTech, a standard report is issued. The report details the Bond test procedure method, and presents the results including F80, P80, Grindability and Work Index. Further interpretation of …

Get Price### A Method of C alculating Autogenous/ SemiAutogenous ...

mill work indices. This paper offered describes a more simple method to generate AG/SAG speciﬁ c energies. This programme incorporates Bond work indices, the JKMRC parameter Ab measuring impact breakage and the parameter ta measuring the abrasion rate, then employs a series of efﬁ ciency values nominated for each transition size (AG/SAG T80).

Get Price### Bond formula for the grinding balls size calculation

Oct 19, 2017· Bond formula for the grinding balls size calculation October 19, 2017 · Archive · 0 . The enterprises consumers grinding media have a question about right choise the grinding ball size (diameter) for the mill in order to achieve the required grinding quality.

Get Price### Bond Work Index an overview | ScienceDirect Topics

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 kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes. He produced a correlation between the mass of test screen undersize per revolution, G, and ...

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Bond equation for recirculating load on a ball mil. load calculation for ball mill circulating Grinding Mill Posts Related to load calculation for ball mill circulating information of calculation for ball mills how to calculate ball charge in sag mills online ball mill calculation bonds work index ball mill manufactuering design bond f . Live Chat

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The most common bond formulas, including time value of money and annuities, bond yields, yield to maturity, and duration and convexity. › Money › Bonds This page lists the formulas used in calculations involving money, credit, and bonds.

Get Price### Mill (grinding) Wikipedia

A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting. Such comminution is an important unit operation in many are many different types of mills and many types of materials processed in them. Historically mills were powered by hand (, via a hand crank), working animal (, horse mill), wind or water ().

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Feb 18, 2019· Calculation of top size grinding media (Fred C. Bond) Calculation of top size grinding media AZZARONI’s Formula I attach Fred Bond’s first empirical equation for sizing grinding …

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