### Bond Work Indexan overview ScienceDirect Topics

Calculations involving Bond s 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 WiC CWi or IWi impact work index .

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bond work index calculation mill efficiency Efficiency Formula Softschools Efficiency is a measure of how much work or energy is conserved in a process In many processes work or energy is lost for example as waste heat or vibration The efficiency is the energy output divided by the energy input and expressed as a percentage.

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Here is a summary of how the index of hydrogen deficiency IHD works A double bond and ring each counts as one IHD A triple bond counts as two IHD Hydrocarbons C x H y 1 I H D = 2 x 2 − y 2 where x and y stand for # of C and H respectively Example 1 IHD for

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

The apparent difference between ball mill and AG/SAG mill efficiency is an artefact of Bond s implicit assumption that the particle size distributions can be defined by one point the 80 passing size In fact Bond noted that this convenient assumption was valid only in cases where the cumulative particle size distributions were roughly parallel in log log space 1950 MacPherson 1989 discussed his findings that in most AG/SAG circuits the parallel line assumption is incorrect He indicated that an AG/SAG circuit product typicallycontains much more fines than a stage crushed or rod milled product having an equivalent 80 passing size the dashed line in Figure 1 illustrates this effect As a result operating work indices calculated

Get Price### Testwork Bond rod mill work indexSAGMILLING

Rod mill work index is used in the SAGMILLING Bond/Barratt specific energy consumption model The work index is used to calculate the energy requirement to grind rocks in the medium size range from 10 mm20 mm down to about 2 mm.

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1 day ago The RPM and Chip Load that automatically populates in this calculator are the factory suggested parameters for running the desired tool Altering the Chip Load or RPM settings in any way without prior written approval from an authorized agent of CGC/Gorilla Mill will void any guarantee or warranty nor will CGC/Gorilla Mill or its agents be liable for any consequential damages due to said

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GRINDABILITY TESTS Bond Rod mill work Index The rod mill work Index is also normally distributed with and average and median of 14.8kWh/t It is common to observe difference between the ball and rod mill caused by variation in ore hardness The test has been mainly used for the design of rod mill or primary ball mills http

Get Price### Investigating of the effect of ore work index and particle

The amount of feed was set at 1175 g which was proportional to industrial scale.The ball mill speed was constantly set at 76.8 Cs.Experiments were conducted at different ball sizes between 20 and 40 mm grinding time 10–30 min solids content 65–80 and work index of copper sulphide ore 12–15.4 .RSM and Box–Behnken design were used for the experimental design and modeling of

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What is Bond Pricing Bond pricing is an empirical matter in the field of financial instruments Public Securities Public securities or marketable securities are investments that are openly or easily traded in a market The securities are either equity or debt based..The price of a bond depends on several characteristics inherent in every bond issued.

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The efficiency ratio is typically used to analyze how well a company uses its assets and liabilities internally An efficiency ratio can calculate the turnover of receivables the repayment of

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An efficiency ratio is a calculation that illustrates a bank s profitability To calculate the efficiency ratio divide a bank s expenses by net revenues The value of the net revenue is found by subtracting a bank s loan loss provision from its operating income Efficiency ratio = Noninterest Expenses Operating IncomeLoan Loss

Get Price### 4 Examples of the Efficiency FormulaSimplicable

The efficiency of business processes is typically calculated in dollar terms based on the value of outputs and cost of inputs For example a production processes uses inputs such as labor electricity materials and parts that cost 3 The output has a value of 4.efficiency

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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 mill circuit product size of 1 000 µm W Total = 2.32 4.77 = 7.09 very large size FkWh/t of 9.70

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The Bond s 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 µm If the breakage characteristics of a material remain constant over all size ranges the calcul ated work

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The Bond work index BWI is a well known method used when selecting comminution equipment to evaluate the grinding efficiency and to calculate the required grinding power Although considered an industry standard Bond did not fully define that procedure and therefore significant discrepancies in test results can sometimes be obtained due to

Get Price### Morrell Method GMG ICE v01 r01 Morrell

and the Bond Ball Mill Test Work Index WiBM GMG 2016a and the Morrell equations and their application see Annex B A worked example is provided in Annex C 5 SCOPE The Morrell method can be used to predict the specific energy of comminution circuits where such circuits include combinations of any of the following equipment

Get Price### Operating work index is not the specific energy consumption

The work index can either be measured in the laboratory the Bond ball mill work index determination is a common example or it can be calculated from the operating performance of

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High efficiency milling is based on the radial chip thinning theory that s been around for a long time The basic idea is to keep the tool cutting at an ideal chip load To increase the metal removal rate the stepover is substantially reduced from the typical 50 of tool diameter but the feed rate is increased in order to maintain the

Get Price### SIZE REDUCTIONUniversiti Teknologi Malaysia

SIZE REDUCTION 2 so separation can be carried out 1 occurs in sizes that are too large to be used Large particles of solids are cut or broken into small pieces reasons 3 increases the reactivity 4 reduces bulk of materials for easier handling and for waste disposal

Get Price### USING THE SMC TEST TO PREDICT COMMINUTION

The work index covering grinding in tumbling mills of coarse sizes is labelled M ia The work index covering grinding of fine particles is labelled M ib Morrell 2008 M ia values are provided as a standard output from a SMC Test Morrell 2004 a whilst M ib values can be determined using the data generated by a conventional Bond

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2 days ago Paper calculation Standard methods to calculate paper and board characteristics require the use of the International System of Units SI or SI metric units Calculating paper Details of SI are provided in the ISO Standards 31 1981 and 1000 1981 Some quantities can

Get Price### SPECIFIC COMMINUTION ENERGYSMC Testing

by the Bond laboratory test using the following equation 80 80 0 295 1 80 80 18 18 ib f p P Gbp p f f f M 1 where M ib = fine ore work index kWh/tonne P 1 = closing screen size in microns Gbp = net grams of screen undersize per mill revolution p 80 = 80 passing size of the product in microns f 80 = 80

Get Price### Bond Work Index TestsGrinding Solutions Ltd

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 100 passing size of <3.35 mm.

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Example CalculationConclusion The Bond Standard WI Efficiency of this circuit = 84 This circuit has an efficiency of 84 compared to the Bond Standardcircuit efficiency of 100 1/84 = 1.2 This circuit is using 1.2 x more energy than the Bond Standardcircuit Examples from Data Base

Get Price### Bond Pricing Formula How to Calculate Bond Price

Formula to Calculate Bond Price The formula for bond pricing Bond Pricing The bond pricing formula calculates the present value of the probable future cash flows which include coupon payments and the par value which is the redemption amount at maturity The yield to maturity YTM refers to the rate of interest used to discount future cash flows read more is basically the calculation of

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A bond is a debt instrument a form of lending The easiest way to think of a bond is to liken it to an interest only loan When you purchase a bond you are essentially loaning money to an entity typically a corporation or government to fund projects or activities In exchange for your loan the bond issuer will pay you regular interest until

Get Price### Size Reduction and Energy RequirementScienceDirect

A Bond ball mill work index is then performed on the mill product for the design of SAG ball mill circuits This is important because it was found that there was a 1–1.5 kWh/t higher ball mill work index if the –3.35 mm ball mill test feed size is obtained by SAG mill grinding compared with crushing.

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Work Index Work Index Efficiency Bond Work Indextesting 4 INTRODUCTION AND BACKGROUND The Bond method allows for quantification and com parison of relative energy efficiencies of most industrialcomminution circuits It is an essential tool for managingthe important business cost of grinding.

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The efficiency of business processes is typically calculated in dollar terms based on the value of outputs and cost of inputs For example a production processes uses inputs such as labor electricity materials and parts that cost 3 The output has a value of 4.efficiency

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Bond s law Bond postulated that work required to form particles of size Dp from very large feed is proportional to the square root of the surface to volume ratio of the product Sp/Vp By relation Sp/Vp = 6/ɸsDp from which it follows that P ṁ = Kb Dp 0.5 Where Kb is a constant that depends on the type of machine and on the material

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To calculate your company s labor productivity you would divide 80 000 by 1 500 which equals 53 This means that your company generates 53 per hour of work You could also look at labor productivity in terms of individual employee contribution In this case instead of using hours as the input you would use number of employees.

Get Price### The bond work index for a mesh of grind of 200 mesh for

8 The bond work index for a mesh of grind of 200 mesh for a rock consisting mainly of quartz is 17.5 kWH/ton How much power in kW is needed to reduce the material in a wet grinding ball mill from an 80 percent passing size of 1100 micrometer to an 80 percent passing size of 80 micrometer at a capacity of 10 ton per hour a.

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The mill dimensions D L are 0.204 0.3 m and it is loaded with 8.55 kg steel rods 14 to 20 mm diameter The mill rotates on rolls and its frequency is set to 70 RPM corresponding to 85 of the critical frequency The mill power is = 22.5 Watts calculated by 6 Fi P nally the product is wet screened to find the size d80 2.4.

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Test WI of circuit feed ore = 16.1 kWh/t The Bond ball mill test Work Index of the ore which applies over the size reduction range of this circuit = 3 150 kW 450 t/h = 7.0 kWh/t WIo ACT = 7.0 10/√ 21210/√ 2 500 = 14.4 kWh/t The circuit s Bond WI Ratio Eff = 16.1 14.4 = 1.12 or 112

Get Price### Using the Bond work index to measure operating

Using the Bond work index to measure operating comminution efficiency C A Rowland 1 Mining Metallurgy Exploration volume 15 pages 32–36 1998 Cite this article

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LaserBond surface engineering technologies can recover and remanufacture components to OEM standard and beyond It protects vital static and mobile machinery and equipment against wear mechanical erosion and corrosion to extend life span reduce maintenance and replacement costs and keep plant machinery working.

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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

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hardness of work material in Vickers Hardness Cemented carbide tool can process work materials up to 30HRC Processing 40HRC is a little difficult High speed steel tool is not possible to process hardened steels.2500 Coating Cover the hardness of tool material If coated tools need x4 harder than work material 40HRC Hardened steels

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A bond issuance works similar to this simplified example The issuing entity such as Ford Motor Company is offering bonds that pay 7 interest for 30 years this is known as the coupon rate and the time period is known as the term to maturity The bond investor decides they want to buy a 10 000 bond.

Get Price### QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

grinding cycles The Bond Work Index is calculated using the formula 𝑖=1 1 44 5 𝑃𝑐 0 23𝐺 82 10 √𝑃80 −10 √𝐹80 1 where W iBond work index kWh/t P ctest sieve mesh size µm Gweight of the test sieve fresh undersize per mill revolution g/rev F 80

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