A Review of Alternative Procedures to the Bond Ball Mill …

Menéndez-Aguado et al. examined the possibility of determining the work index in a Denver laboratory batch ball mill with the same inner diameter as the Bond ball standard mill. The research was performed on the size class of −3.35 mm using samples of gypsum, celestite, feldspar, clinker, limestone, fluorite, and copper slag.

CALCULATION OF THE REQUIRED SEMIAUTOGENOUS …

characteristics of the ball mill discharge. Considering the Bond energy law and the correction factors by Rolland, the total specific energy E req required for comminution of mineral from the initial size F 80 (coarse crushing discharge) to the final size P 80 (ball milling dis-charge) in the conventional circuit is found as follows: E req = (4)

Bond´s work index estimation using non-standard ball …

2.2. Ball mills and operation conditions Fig. 2(a-d) shows the ball mills used in the determination of the Work Index (standard mill BBM and non-standard mills BM-1 to BM-3, all ball mills without lifters). Bond standard ball mill (Fig 2(a); BBM) has a total volume of 22284 cm 3, is fed with 700 cm of ore and 1638 cm of steel balls. This

Determination of the Bond work index on samples of non …

The Bond work index, W i, is defined in a Bond ball mill on the samples of standard size −3.327 + 0 mm. In practice, it is possible to find materials of non-standard size that are finer than 3.327 mm. In this work, a procedure for the calculation of

A new approach to the calculation of bond work index

A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains. Int. J. Miner. Process., 165 (2017), pp. 8-14, 10.1016/j.minpro.2017.05.011. View PDF View article View in Scopus Google Scholar. Menéndez et al., 2018.

Correction of Bond Ball Mill Work Index Test for …

The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis to another. The proposed model consists of two components, the variable coefficient that is

Determination of work index in a common …

In the Bond ball mill test, the work index is finally obtained. by. w. P Gbp PF. i = ... This was done by means of the Bond Ball Mill Standard test [24][25] [26]. In brief, with the aim to ...

Correction of Bond Ball Mill Work Index Test for Closing …

It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P 80 close to desired grind size. This is because work index frequently changes as ...

Comparative assessment of the Bond Ball Mill Work Index …

The article presents the review, studies and classification of the existing methods of the Bond Ball Mill Work Index determination. The scope of the analysis embraces the methods of Aksani and ...

Bond Work Index

The SAG mill product is then crushed to passing 3.35 mm and is subjected to a standard Bond ball mill work index (S d-BWi) grinding test to provide the total pinion energy at the specified grind size for mill design purposes. A calibration equation is used to convert the test result (total number of revolutions to reach the endpoint and ...

Secrets of the Bond Ball mill grindability test

It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P 80 close to desired grind size. This is because work index frequently changes as ...

Estimation methodology for Bond ball mill work index …

A standard Bond mill (Fig. 1) was designed to perform the work index tests and determine the energy consumption of various s minerals.The mill has a round …

BOND WORK INDEX TEST BALL MILL

The FC Bond Work Index Test Ball Mill was designed by F. C. Bond for use in determining the Bond Index, a measure of grindability and power required for grinding applications. The FC Bond Mills are used in …

A new approach to the calculation of bond work index

The grindability of raw material is generally determined by Bond's standard ball mill grindability test (developed by the Allis Chalmers company). The ball mill grindability test is used for describing ore hardness and it is so widespread that the Bond Work Index generated from the test is often referred to as an ore characteristic.

A Review of Alternative Procedures to the Bond Ball Mill …

Denver laboratory batch ball mill. Table 4. Ball charge in Bond and Denver mills used by Menendez Aguado et al. Bond Mill (1952) Denver Mill Number of Balls Diameter, cm Mass, g Number of Balls Diameter, cm Mass, g 22 3.810 5951 10 3.810 2705 34 3.175 4767 16 3.175 2243 50 2.540 3750 23 2.540 1725 54 2.223 3007 25 2.223 1393 73 …

Bond´s work index estimation using non-standard ball …

Fig. 2(a-d) shows the ball mills used in the determination of the Work Index (standard mill BBM and non-standard mills BM-1 to BM-3, all ball mills without lifters). Bond standard ball mill (Fig 2(a);

Procedure for determination of ball Bond work index in the …

The Bond ball mill grindability test is run in a laboratory until a circulating load of 250% is developed. It provides the Bond Ball Mill Work Index which expresses the resistance of material to ...

Variability of the Ball Mill Bond's Standard Test in a Ta Ore …

The ball mill grindability test is used for describing ore hardness and it is so widespread that the Bond Work Index generated from the test is often referred to as an ore characteristic.

Compare and Understand Rod/Ball/Impact …

The Bond ball mill work index (Wi BM, or BWi) conducted from a feed size of approximately 2 mm to a product size on the order of 100 µm. The Bond rod mill work index (Wi RM, or RWi) conducted …

Bond Ball Mill Grindability Test Summary

It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P 80 close to desired grind size.

A new methodology to obtain a corrected Bond ball mill …

Becerra et al. (2010) examined variations in the Bond ball mill work index that can occur when choosing the procedure used to interpolate the F 80 and P 80, …

A Review of Alternative Procedures to the Bond …

standard Bond ball mill in time intervals of 0.5 min, 1 min, 2 min, and 4 min. After each grinding run, the mass of the sample is measured, and the PSD is determined.

A Statistical Comparison of Bond Ball Mill Grindability Work Index …

Kaya E, Fletcher PC, Thompson P (2002) Reproducibility of bond work index with different standard ball mills. In: Dodge P, Safford AZ (Eds.), Dawson Metallurgical Lab, Inc Salt Lake City, USA ...

Procedure for determination of ball Bond work index in the …

A Bond Ball Mill Work Index 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 …

Bond Work Index Procedure and Method

Bond Grindability Test Procedure

For the ball mill grindability test, the work index is calculated from the following revised equation (in short tons): where: Pi = sieve size tested (microns) Gpb = ball mill grind ability Wi, P & F have the same meanings as in the top equation. Equipment required: Laboratory ball mill, 34.02 cm x 34.02 cm with following ball charge: Agitator ...

BOND GRINDABILITY INDEX TEST BALL MILL

A Bond Ball Mill, 12" x 12" of fabricated construction comes with electric motor and gear reducer drive, digital counter, jogging button to provide positioning of drum for loading and unloading, emergency stop button, 44 ½ lb ball charge, stand and receiving pan. Perform Fred C. Bond's grindability tests with this standard BWI test ball ...

FC Bond Mill

grams per revolution (Gbp) is the ball mill grindability. The ball mill work index, Wi (kWh/short ton) is calculated from the following equation (Bond 1961):1 The mill should be cleaned by either blowing air into it or wiping the interior with a cloth and or brush. The FC Bond ball mill is now ready for the next sample.

A Statistical Comparison of Bond Ball Mill Grindability …

There were 12 Bond Work Index tests run in total. Six tests were performed on a BICO model ball mill (which has a noted hand hole door area) and six on a Sepor model ball mill which has a completely smooth inside chamber. A diagram is shown in Figure 2 highlights these differences. Tests 1-6 were performed

Estimation of the Specific Energy Requirement for Size Reduction …

Therefore, it is important to have a sound methodology for design and scale-up of ball mills from the energy efficiency and productivity points of view. Design engineers generally use Bond equation to estimate specific energy requirements using a parameter called, Bond Work Index, which is determined experimentally in a laboratory ball mill [1 ...

A Statistical Comparison of Bond Ball Mill Grindability Work Index …

Research was performed to make an objective comparison of Bond Ball Mill Grindability Work Index results derived from using two commercial testing apparatus, from BICO and Sepor respectively, each ...

BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T

It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P 80 close to desired grind size. This is because work index frequently changes as ...

P80 of Bond ball mill Work Index tests

The laboratory procedure for running a Bond ball mill work index test requires that the operator choose a closing screen sieve size. The instruction is to choose a sieve size that results in the ...

A Review of Alternative Procedures to the Bond Ball Mill …

Keywords: grindability; comminution; Bond work index 1. Introduction Determining the Bond index using the Fred Bond method [1,2] is considered the state-of-the-art methodology for mill calculations and a critical process parameter in raw materials selection and grinding process control. Although it is usually referred to as a

Compare and Understand Rod/Ball/Impact …

The Bond ball mill work index measures the grindability in the 2-0.1 mm size classes whereas the SPI (or the generic SGI) measure the 15-2 mm size classes and the A×b measures either the 65-3 mm …