### Bond Work Index Energy equation Grinding

You need a two stage solution first stage open circuit mill and then second stage closed circuit mill First stage will be broken into two parts as well you use a Bond rod mill work index for the coarse component of the ore 2.1 mm and the Bond ball mill work index for the fine component 2.1 mm .

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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 Bond work index value is quite complicated timeconsuming and requires trained operating personnel and therefore is subjected to errors.

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Ball mill is an efficient tool for grinding silica sand into silica powder There are two ways of grinding the dry process and the wet process It can also be divided into tabular type and flowing type according to different forms of discharging material Ball mills are widely applied in

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The Bond Index conforming ball charge consists of 43 x 1.45 balls 67 x 1.17 balls 10 x 1 balls 71 x 0.75 balls 94 x 0.61 balls The optimum number of grinding balls is 285 However the ball diameters vary due to wear Therefore the total ball number should be adjusted from time to time to ensure a total mass of 20.125

Get Price### Standard Bond Ball Mill Grindability Test Method Procedure

Dec 14 2015 Here is the old Allis Chalmers Bond Work Index Grindability Test Procedure The standard feed is prepared by stage crushing to all passing a 6 mesh sieve but finer feed can be used when necessary It is screen analyzed and packed by shaking in a 1000 cc graduated cylinder and the weight of 700 cc is placed in the mill and ground dry at 250

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Get Price### Investigation into the applicability of Bond Work Index

Oct 15 2015 Bond Work Index BWI Hardgrove Grindability Index HGI tests for biomass coal BWI can predict the potential for mill choking of biomass in a tube and ball mill HGI is a poor method of predicting grindability of biomass in vertical spindle mills Pellets should be composed of pre densified particles close to the target size

Get Price### Estimation of Grinding Time for Desired Particle Size

Jan 03 2020 Ball mills are progressively used to grind the ores for particle size reduction and to liberate valuable minerals from the ores The grinding of ore is a highly energy intensive process 1 2 3 4 this process the size of the particle obtained depends on the energy consumption of the ball mill.

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Steel Ball Mills Lined Ball Mills Particle size reduction of materials in a ball mill with the presence of metallic balls or other media dates back to the late 1800 s The basic construction of a ball mill is a cylindrical container with journals at its axis The cylinder is filled with grinding media ceramic or

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May 01 2021 A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains Int J Miner Process 165 2017 pp 814 10.1016/j.minpro.2017.05.011

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µm Note that in order for no correction factor for ball mill product fineness to apply the ball mill circuit P80 should be no less than approximately 70 µm Bond 1962 This Bond Efficiency determination should not be applied to cir cuits with a P80 finer

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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

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Get Price### The Effect of Circulating Load and Test Sieve Size on The

the Bond ball mill grindability Ght and work index W with natural amorphous silica 2 MATERIAL AND METHOD As a base for this study four natural amorphous silica samples were used for test The chemical properties of samples are presented in Table 1.

Get Price### Bond Work Index Procedure and Method

Jun 06 2015 Bond Work Index for Testing Procedure Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done Add about 500 g of silica sand

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Laporan Akhir Projek Penyelidikan Jangka Pendek Study of the The clinker samples collected also undergone standard Bond grindability test The objective of the Bond ball mill test is to determine the so called standard work index . carbonate found in calcareous rock such as lizenithne silica

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Get Price### Application of Operating Work Indices in Autogenous

Ball Mill Wio BWio 8.6 Circuit Wio OWio 14.6 Bond Ball Mill Work Index BWi kWh/t 13.4 Bond Rod Mill Work Index RWi kWh/t 18.1 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

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Get Price### PDF The Effect of Circulating Load and Test Sieve Size

This index is determined on a laboratory scale using a Bond ball mill and by simulating dry grinding in a closed circuit until the 250 circulating load has been obtained.

Get Price### Bond Work IndexDetermination of the Bond Work Index of

Number of revolutions of the ball mill for the next run and percent circulating load were calculated The grinding process was repeated until a target 250 ± 2 circulating load was obtained Figure 1 Grinding Method III Results and Discussion To determine the Bond work index of the given ore equation 1

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Bico Bond Grindability Mill 25300 7 394.22 Legend Inc Sparks Legend Inc Sparks Nevada USA Bico Bond Grindability Mill 25300 Bico Bond All Ball Mills come standard with one 44.5 lb charge of iron balls iron stand Get Price Breakage Properties of Porous Materials by Ball Milling Silica 90 91 0 13 011 0 36 0 07 006 0 27

Get Price### Circulating loadSlideShare

Nov 18 2014 The Bond s work index values increased as test sieve size decreased 16 Bond work index is changed with the change in the test sieve size and circulating load This must be taken into account when energy consumption is calculated according to the Bond formula unit energy cost extra increased as circulating load decreased from 250 .

Get Price### Bond Work Indexan overview ScienceDirect Topics

The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill see Figure 3.10 a question arises as to whether this practice will alter the ball mill work index BW i of the material

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Jan 31 2019 Bond Work Index A standard 12″ 12″ laboratory Bond ball mill was used to conduct the work index experiments About 50 kg of each of the BHQ and BHJ samples was prepared in −3.35 mm size by a jaw crusher followed by a roll crusher Size analysis results for the crushed products of the BHQ and BHJ samples are shown in Fig 1.

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mill bond index of silica sand peperoncinostia relation between bond index of silica sand and ball mill Bond Ball and Rod Mill Work Indices The work index is a measure of the resistance of an ore to grinding It is used to calculate mill power and the size of grinding media required The ball and rod mill work indices are determined Get price

Get Price### Table of Bond Work Index by Minerals

Jun 19 2015 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 cylpebs Source 6 SME handbook of mineral processing N.L Weiss Editor NY 1985 Bond Work Index

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Jul 08 2016 The Work Index values listed in Table I and II apply directly to a wet grinding overflow type rod mill 7.5 feet in diameter in open circuit and to a wet grinding overflow type ball mill 7.5 feet in diameter in closed circuit with a rake classifier at 250 circulating load and with 80 or

Get Price### Bond Work Indexan overview ScienceDirect Topics

It involves grinding 50g of the material e.g coal of specified size 16–30 mesh cut in a specified ball and race mill for 60 revolutions The amount of 200 mesh material is measured w grams and the index is defined as I = 13 6.93 w Thus the higher the index the easier is the grinding task.

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Bond Ball Mill Index Test BBMWI A BBMWI 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 rod milling experiment of silica sand crusher in indonesia related posts silica sand mining market news ammtec bond rod mill work index is not

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Bond Work Index Procedure and Method Bond Work Index for Testing Procedure Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done Add about 500 g of silica sand into the mill containing the ball charge Seal the mill Rotate for 20 revolutions to clean Empty the

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Get Price### Evolution of grinding energy and particle size during dry

Oct 01 2020 The value of τ is in good agreement difference below 4 with the results of Schellinger 1951 for the ball milling of silica sand Interestingly this value was determined from a comparison between the dissipated thermal energy obtained by calorimetry and the mechanical energy consumed by the mill using a torque sensor 3.4.

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Get Price### Investigation into the applicability of Bond Work Index

Oct 15 2015 The index varies from 20 to 110 with a lower HGI indicating a coal is harder to grind and more energy will be required to reach the required degree of fineness The test is conducted on a standardised laboratory scale ball and race mill and is covered by BS 1995.

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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 50–60 Furthermore it may be observed that the Bond ball mill work indices for

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