﻿ how to calculate mill bond or work index

# how to calculate mill bond or work index

### Investigation into the applicability of Bond Work Index ...

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 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

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

bond ball mill index whiteout.eu. · grindability is Bond's work index which is defined as the resistance of the material to grinding. The standard equation used by them for the ball mill work index (Bond work index) is as follows. 230. 82 1 10 / 80 > 10 / 80 @ 44.5 1.

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

A quick method for bond work index approximate value. 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. A New Approach to the Calculation of Work Index and the. The mill power is = 22.5 Watts ...

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

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   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.

### (PDF) A quick method for bond work index approximate value ...

calculate idling and aggregate capacity of the mill main drive. Key word: semiautogenous milling, modeling, strength pro- perties, grindability, Bond work index.

### CORRELATION BETWEEN BOND WORK INDEX AND …

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. Rod Mill Semi Continuous Process 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

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

21 CONCLUSIONS Continued In the present work, equations were also derived, giving: zthe ball-mill power drawP as a function of its dimensions: internal mill diameter D and length L, zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm), the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h), zthe ball-mill dimensions (D and L), when ...

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

Jan 01, 1989· The Bond work index, W i, 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.Therefore, in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when, for a given size of grinding product, the value of the work index W i ...

### Exercise 6-1

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 ...

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

3. D80 in the mill feed and product. Calculate the power required using Rowland's factor for Bond work index in open circuit. 4. D50 in the cyclone. 5. Pressure drop across the cyclone. 6. Right click on the mill icon to generate a plot of the selection function that was generated by the mill model. Save a copy of this graph for future ...

### Application of Operating Work Indices in Autogenous ...

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 ball mill work index test (M. ib. is NOT the Bond ball work index). M. ic. and M. ih ...

### Ball Mill Design/Power Calculation

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   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.

### Bond Tests | Mining | SGS

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 closed-circuit dry grindability test performed in a standard rod mill.

### Bond Work Index Formula-Equation

May 18, 2013· This video was put together by Joshua Wright and Aldo Vasquerizo as a supplemental lecture for University of Nevada Reno. If you have any questions, need adv...

### Bond Work Index (Energy equation) - Grinding ...

Bond Rod Mill Grindability Test. 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. Abrasion Index Test

### how to calculate mill bond or work index

A quick method for bond work index approximate value. 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. A New Approach to the Calculation of Work Index and the. The mill power is = 22.5 Watts ...

### 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 ...

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

A clear definition of the required crushing capacities and the desired product quality can be precisely determined by using the Bond Index test methods. Using the Bond Index test procedures it is possible to calculate crushing / abrasion behavior of mineral samples. This knowledge is essential to define the required ball mill layout and ...

### USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT …

The Bond low-energy impact crushing work index (more informally, the Bond crushing work index) is not as common as the Bond ball mill work index, and it is a notoriously noisy test.. The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus.

### How To calculate Mill Bond Or Work Index

Dec 12, 2016· 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…

### QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE …

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 ...

### Bond Work Index Tests - Grinding Solutions Ltd

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.

### ball mill work index calculation - ME Mining Machinery

Sep 01, 1989· 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.

### Application of Operating Work Indices in Autogenous ...

The standard Bond Rod Mill Work Index test procedure is firstly to stage crush the feed to pass 12.7 mm, and size a representative sample. The test then involves a series of batch grinds in a standard Bond rod mill. A Bond rod mill is 0.305m by 0.610m, with wave liners (of a form described by Bond), which runs at 40rpm and tilts as described below.

### MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL …

Bond Work Index Tests Grinding Solutions Ltd. The test requires at least 10 particles of 75 50 mm ore however for more representative results it is recommended that over 20 particles are tested Bond Ball Mill Grindability Test The Bond Ball Mill Work Index BBWi test is carried out in a standardised ball mill .