# bond work index calculation mill efficiency

• ### MODELING THE SPECIFIC GRINDING ENERGY AND BALL

Introduction of the Bond work index w i to the above equations Hard ore 18.0 1.961 Medium ore 12.0 1.290 Soft ore 6.5 0.671 Coefficients k Bond work index (w i) kWh/short ton Denver ore-hardness Table. Relationship between the Bond work index

• ### Tubular Rod MillsScienceDirect

the size of the industrial mill. Data Laboratory Standard Bond Test Rod Mill Grindability index at 10 mesh = 13.5 kWh/t. Solution Step 1. From Equation (3.3) the work is given by W o r k = 10 W i 1 P 80 − 1 F 80 kWh / t (A factor of 1.1 may be required if the work index is in kWh/short ton) Substituting values W o r k

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

Standard size ranges and the related Bond work indexes Feed size F 80 μm Product size P 80 μm Work index 100000 10000 crushing CWI 10000 2100 rod milling RWI 2100 100 ball milling BWI Fig. 1. Laboratory equipment used by RIVS for determining the Bond work

• ### CORRELATION BETWEEN BOND WORK INDEX AND

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

• ### bond ball mill calculations spreadsheet

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

• ### A study of simulating the calculation method of the Bond

A new method of simulatingthe calculation of the Bond rod-mill work index by using thegrindingkinetic test data of the feed is proposed. 1 TRODUCTION Bondwork indices are widely used to select and size the crushing and grindingequip- ment to estimate the efficiency of the crushing and grinding process and to calculate grindingmedia power

• ### bond ball mill calculations spreadsheet

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

• ### cement mill grinding media calculation youtube

Jan 07 2015 Raw mills usually operate at 72-74 critical speed and cement mills at 74-76 . 3.2 Calculation of the Critical Mill Speed G weight of a grinding ball in kg. w Angular velocity of the mill tube in radial/second. w = 2 3.14 (n/60) Di inside mill diameter in meter (effective mill diameter). n Revolution per minute in rpm. Learn More

• ### (PDF) Rapid determination of Bond rod-mill work index by

Generally Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power. In the current research a simple

• ### Tubular Rod MillsScienceDirect

the size of the industrial mill. Data Laboratory Standard Bond Test Rod Mill Grindability index at 10 mesh = 13.5 kWh/t. Solution Step 1. From Equation (3.3) the work is given by W o r k = 10 W i 1 P 80 − 1 F 80 kWh / t (A factor of 1.1 may be required if the work index is in kWh/short ton) Substituting values W o r k

• ### Bond Ball Mill Work Index (Grindability Tests)YouTube

May 19 2013 · Bond Ball Mill Work Index (Grindability Tests) Joshua Wright. Bond Impact Crushing Work Index TesterDuration ball mill grinder ball head endmill sharpener ball nose end mill grinder

• ### GMSG GUIDELINE DETERMINING THE BOND EFFICIENCY

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. W1 = 9.5 x (10 / √ 1 000)(10 / √ 19 300) = 2.32 kWh/t

• ### crushing efficiency calculation equation

Jaw crushing efficiency calculation equation coal hammer mill sizing calculation hayphillips mining find the right and the top conical ball mill size and capacity for your coal ball mill efficiency calculations mobile jaw crushing plant click calculate crushing efficiency of crushers jaw . Get price Bond Work Index

• ### Bond Work Index TestsGrinding Solutions Ltd

Grinding Solutions can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from 4.75mm to 212µm.

• ### MINE 331Bond Work Indexii MINE 331 Bond Work Index

1 Introduction Finding the bond work index of an ore type is crucial to determining the grinding energy required during comminution in a ball mill. The bond work index is a constant characteristic related to the hardness of a specific ore type. Bond work index is one of three different approaches that can be used to calculate the work index of an ore.

• ### Bond Work Index Formula-Equation

Basic Equations
• ### Training Courses based on the Grinding Software

13. Volume Load Calculator for 2 chambers mill 14. Volume Load Calculator for 3 chambers mill 15. Bond Power Formula Calculator 16. Hogg and Fuerstenau Power Formula Calculator 17. Monochamber Mill Power Calculator 18. Drying Grinding Chamber Mill Power Calculator 19. 2 Chambers Mill Power Calculator 20.Central Discharge (Birotator) Mill

• ### 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.

• ### Orway Mineral Consultants Canada Ltd. Mississauga ON

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 ib indices are used to calculate specific energy for the coarse (W a) and fine (W b) components of the total grinding specific energy at the pinion (W T) according to Equation 7. W i = 4.K.M i. Pf(P)-Ff(F) (6) W T = W a W b

• ### Ball Mill Design/Power CalculationLinkedIn

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

• ### Bond Ball Mill Index Test JKTech

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

• ### Bond Ball Mill Index Test JKTech

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

• ### How to Calculate Grinding Mill Operating Efficiency

In grinding operating Efficiency compares the operating work index of a comminution machine to the Bond work index from bench scale crushing and grindability tests or/and pilot plant tests. Economic Efficiency is comparing the income from production to the planned income from production. Energy as consumed in comminution machines and the required energy as determined from bench scale

• ### formula to calculate efficiency of mill

For operating efficiency calculations it is necessary that the efficiency factors are applied so that both work indices used in the comparison are on the same basis. Operating efficiency based upon using operating work indices is also a useful tool in comparing the variations in grinding mill operations such as mill speed mill size size

• ### design calculation of ball mill

formula s to calculate efficiency of ball mill. How to Size a Ball Mill Design Calculator Formula. Ball milling a ball mill with a diameter of 2.44 meters inside new liners grinding wet in open circuit. Note that any efficiency factors can be dropped from equation 2 on substituting the work index Wi in equation 1

• ### Bond Index Ball Mill / Rod Mill BT 100 XLRETSCH

The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work Index (BWI) is used for the range from 2.1 mm down to 100 µm.

• ### Ball Mill Design/Power CalculationLinkedIn

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

• ### AMIT 135 Lesson 7 Ball Mills CircuitsMining Mill

Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75106 microns. The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150250 microns. The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges

• ### 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 80sieve mesh size passing 80 of the feed before

• ### 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 processes.There are many different types of mills and many types of materials processed in them. Historically mills were powered by hand (e.g. via a hand crank) working animal (e.g. horse mill) wind or water ().

• ### Bond Tests Mining SGS

Bond F. C. "Crushing Tests by Pressure and Impact" Trans AIME Vol 169 1947 pp 58-66. 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.

• ### JKTech Laboratory ServicesJKTech JKTech

For every Bond Ball 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 the results is available if required. Frequently Asked QuestionsBond Ball Mill Work Index

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

Standard size ranges and the related Bond work indexes Feed size F 80 μm Product size P 80 μm Work index 100000 10000 crushing CWI 10000 2100 rod milling RWI 2100 100 ball milling BWI Fig. 1. Laboratory equipment used by RIVS for determining the Bond work

• ### 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.

• ### MODELING THE SPECIFIC GRINDING ENERGY AND BALL

Introduction of the Bond work index w i to the above equations Hard ore 18.0 1.961 Medium ore 12.0 1.290 Soft ore 6.5 0.671 Coefficients k Bond work index (w i) kWh/short ton Denver ore-hardness Table. Relationship between the Bond work index (w i) and the ore hardness designated by Denver