### 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 41-46 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 Get price

### A Method of C alculating Autogenous/ Semi

rod mill work index has not been de ned as yet The ball ﬁ mill work index is con rmed at 16 kWh/t The operating ﬁ work index though is in the range of 21 kWh/t to 25 kWh/t showing high inefﬁ ciency This raises the point that in some cases the Bond EF4 oversize factor calculation is Get price

### A procedure for rapid determination of the Bond work index

The grindability of an ore in the process of mineral dressing can be determined by use of the Bond work index (W i) 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

### CALCULATION OF THE POWER DRAW OF DRY

Equation 1 is multiplied by the factor of 1 08 A multi-compartment ball mill consists of two or more grate discharge ball mills in series The same equation is used to calculate the power that each ball mill compartment should draw The total power is the sum of the Get price

### PDC Mass Balance

Mill Type Ball Mill Engineering Design Number of Trains 2 Engineering Design Number of Mills 4 Calculations Mill Size Dia mm x EGL mm 7 600 x 11 960 TBC by Suppliers Drive kW 14 000 TBC by Suppliers Bond Work Index - Ball Mill (Design) kWh/t 16 0 Testwork/Engineering Design Average Tonnage Rate (Each) t/h 1441 Calculations Get price

### Testwork Bond ball mill work index

The Bond ball mill work index is one of the most commonly used grindability tests in mining and is often referred to as the Bond work index The test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed Get price

### General work input function for sizing grinding ball mills

Grinding mills Comminution Work index Mill sizing Kelsall D F 1964 "A study of breakage in a small continuous open circuit wet ball mill " Proceedings 7th International Mineral Processing Congress Gordon and Breach Science Publishers Inc New York pp 33–42 Get price

### CORRELATION BETWEEN BOND WORK INDEX AND

the work index depending on the grind size In this way work index values are usually obtained for some specific grind size that characterizes the grinding operation to design or under evaluation This study was carried out in a standard bond ball mill 305 mm x 305 mm size Get price

### Bond Grinding Circuit Efficiency

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 Get price

### Practical 1 Ball Milling

Dec 23 2013Practical 1 Title Ball Milling Objective To grind the coarse salt to a smaller size by using a ball mill and to obtain the particle size distribution of the initial and the sieved final mixture Introduction 'Ball milling is a method used to break down the 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 41-46 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 Get price

### CALCULATION OF BALL MILL GRINDING EFFICIENCY

Mar 08 2013calculation of ball mill grinding efficiency dear experts please tell me how to calculate the grinding efficiency of a closed ckt open ckt ball mill in literatures it is written that the grinding efficiency of ball mill is very less [less than 10%] please expalin in a n excel sheet to calcualte the same thanks sidhant reply Get price

### SAGMILLING COM tools

Estimates the charge volume of a grinding mill based on the number of exposed lifters By counting the number of lifters showing (during a mill shutdown) and comparing to the total number of lifters (including those buried in the charge) the fraction of the mill under the charge is determined Get price

### how to calculate mill bond or work index

CORRELATION BETWEEN BOND WORK INDEX AND 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 Get price

### how to calculate power consumption in ball mill

I too am not an expert in ball mill sizing but from what my general understanding goes method to calculate Bond's Work Index (WI) takes into consideration a 250% circulating load and ball mill sizing is based on the WI ball mill power calculation Figure 85 Effect of mill filling on power draft for ball mills The data A simple equation Get price

### Tubular Rod Mills

As in ball mills the power draft of a rod mill is the product of capacity and work index which is the energy required to break a mineral of a given size to the required size The mill power is also increased by increasing the rod charge and the mill speed while the mill power and capacity are both increased with increasing mill length Get price

### ball mill work index calculation

ball mill work index calculation mirest cz A New Approach to the Calculation of Work Index and the 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 A New Approach to the Calculation of Work Index Get price

### ball mill operatng work index calculation

80 sizes typically reached by conventional ball milling The delineating size between coarse and fine grinding is 750 m SMC test results are used to determine the Drop Weight Index (DWi) and the coarse ore grinding index (M ia) Test data from the Bond ball mill work index test is used to calculate the fine grinding index (M ib) The M ia and M Get price

### bond ball mill work index equation in wills

Oct 21 2016 Ball mill ball size calculation bond ball mill work index equation in wills bond ball mill work index test standard pdf Grinding Mill Ball Mills Mine Engineer Com This formula calculates the critical speed of any ball mill Most ball mills operate most efficiently between 65% and 75% of Get price

### 20150821 Morrell Method

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 Get price

### Calculate Ballnose Cutter RPM Same as Endmill?

Jul 30 2010For RPM calculation would it be the same as for a normal Endmill? 07-29-2010 09 chatter is a function of tool deflection Unless your work is extremely thin (cutting close to the edge and creating a thin wall that can chatter) or poorly supported the tool deflection is going to be the biggest component If you touch off the ball Get price

### CALCULATION OF BALL MILL GRINDING EFFICIENCY

Mar 08 2013calculation of ball mill grinding efficiency dear experts please tell me how to calculate the grinding efficiency of a closed ckt open ckt ball mill in literatures it is written that the grinding efficiency of ball mill is very less [less than 10%] please expalin in a n excel sheet to calcualte the same thanks sidhant reply Get price

### Ball Mill

Nov 18 2008Summary The Ball Mill is designed to grind materials by turning the cylindrical shell with grinding medium (e g steel balls) put in the shell and has a simple structure and ease of handling Furthermore The Ball Mill of a large capacity has been available to a very extensive range of applications in both dry and wet 14 References 1 Get price

The Bond_Mill Throughput spreadsheet was designed to estimate the Grinding Capacity of a given mill of known dimensions and operating conditions - Net Power Draw in particular - based on the traditional Bond's Law and the Hogg Fuersteneau Power Model (see Mill Power_Ball Mills spreadsheet for further details on such model) Theoretical Get price

### End Milling Calculators

Calculators for End Milling Application MENU {{searchText}} Calculate Surface Finish when using a Ball Nose End Mill G Spec Balance Formula Calculate the Amount of Material Removal Required to obtain G-Spec Balance for Milling Applications Work for Kennametal Stay In Touch Get price

### A New Approach to the Calculation of Work Index and the

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 A New Approach to the Calculation of Work Index and the Potential Energy of a Particulate Material Get price

The Bond_Mill Sizing spreadsheet was designed to determine the most appropriate mill dimensions and operating conditions for a given grinding task (known ore properties plus desired mill throughput and feed and product sizes) based on the traditional Bond's Law and the Hogg Fuersteneau Power Model (see Mill Power_Ball Mills spreadsheet for Get price

### how to calculate mill bond or work index

CORRELATION BETWEEN BOND WORK INDEX AND 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 Get price

### SAGMILLING COM tools_millfilling

Enter the number of lifters that are exposed above the mill charge Fractions are acceptable and should be used in the case where the charge does not sit uniformly in the mill For example you may have 29 rows exposed at the discharge end of the mill and only 28 exposed at the feed end Get price

### Calculate ball charge ball mill

Calculate media charge in a ball mill xls DBM Crus 2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP Ballmill scale up Bonds LawData 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

### O I SKARIN N O TIKHONOV CALCULATION OF THE

CALCULATION OF THE REQUIRED SEMIAUTOGENOUS MILL POWER BASED ON THE BOND WORK INDEXES O I SKARIN Senior Researcher Candidate of Engineering Sciences N O TIKHONOV Head of Subdivision Optimization of ore pretreatment and selection of the ap-propriate equipment is one of the main areas of activity of RIVS Science and Production Association Get price

### Ball Mill

Work Index Ball Mill alluding to the grind ability list of Metals is utilized to demonstrate the granulating trouble of the material It is measured by a rule that to compute the work file ball plant in light of yield of every unrest of the factory after the material is ground to an adjusted state by the predetermined plan Get price