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.
Correction of Bond Ball Mill Work Index Tests for …
This is because work index frequently changes as a function of the product size in comminution. If target grind size during a project is changed, or if the test is run at the wrong product size, then it is necessarily to provide a correction. The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis
A Review of Alternative Procedures to the Bond Ball Mill …
in a Bond ball mill for 0.33, 1, 2, 4, and 8 min. After each grinding cycle, the grinding product PSD is determined and returned to the mill for the subsequent grinding cycle.
A Bond Work index mill ball charge and closing screen …
An alternative mill ball charge is proposed that closely approximates Bond's original total ball mass, number of balls and ball surface area. Results of 30 Bond Work index tests of six pure materials (calcite, magnesite, labradorite (feldspar), quartz, andalusite and glass) using closing screen apertures (P 1 ) values of 500, 250, 125, 90 …
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 …
Bond Work Index Formula-Equation
The sample was received crushed appropriately for the ball mill test. Ball Mill Grindability Test was conducted by standard practice using 100-mesh (150 pm) closing screens. The ball mill work index is shown below. BM Wi (kW-hr/st) = 17.97 ; BM Wi (kW-hr/mt) = 19.81; Bond Ball Mill
Determination of work index in a common laboratory mill …
Therefore, we estimated the resistance of the soil samples to ball milling in terms of specific power consumption for grinding. This was done by means of the Bond Ball Mill Standard test [24][25 ...
Determining the Bond Efficiency of industrial grinding …
The metal Bond ball mill is 30.5 cm inside diameter and. 30.5 cm inside length, with rounded corners. It is smooth except for the door hole used for charging. The grinding charge consists of 285 iron or steel balls (43 @ 36.8 mm diameter, 67 @ 29.7 mm diameter, 10 @. 25.4 mm diameter, 71 @ 19.1 mm diameter, and 94 @.
Measurement of electrical energy consumption in a Bond ball mill
determined by 0.0254 Wh/rev (difference between 0.1331 and 0.1077) or 91.44 Ws/rev. This is equivalent to a power draw of 106. 76 W for the mill with ore and balls and is. very comparable to Bond ...
Product size distribution function influence on interpolation
Differences up to 6,2% in the Bond ball mil work index can be observed due to different siz distribution in P 80 calculation.. 13 ores were tested using the Bond ball mill grindability test, obtaining P 80 using different interpolation functions. Rosin Rammler's model showed the best behavior, so its use must be not only suggested, but …
A Review of Alternative Procedures to the Bond Ball Mill …
Procedures to the Bond Ball Mill. Standard Grindability Test. Metals. 2021, 11, 1114. https://doi/ 10.3390/met11071114. Academic Editor: Jean François Blais. …
Testwork: Bond ball mill work index
The P 80 of a ball mill work index test can be estimated if the P 100 is know based on this equation: Estimate grams per revolution when only P100 is known. NI43-101 reports often provide P 100 and the work …
Alsto Bond Index Ball Mill – Mineral Stats
Safety is a prime consideration for all Alsto equipment and the Bond Index Ball Mill is supplied equipped with acoustic enclosure. The ball mill is designed to accept a ball charge in accordance with F. C Bond's standard. This ball charge consists of 286 balls as follows: 44 x 35mm balls. 67 x 30mm balls. 10 x 25.4mm balls, 71 x 19.05mm balls ...
BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of –0.45 in the 100 µm to 200 µm size range, not the –0.50 exponent empirically measured by F. Bond. The work index increase between 100 µm and 76 µm is due to a porphyritic grain size that causes a spike in energy
Procedure for determination of ball Bond work index in
Abstract. 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 ...
Modified Bond Ball Mill Work Index Test
a modified Bond ball mill procedure (Mod Bond) was developed by MinnovEX Technologies (now SGS) which requires 1.2kg of sample crushed at minus 3.35mm. The 1.2kg charge is milled with the standard …
A Review of Alternative Procedures to the Bond Ball Mill …
standard Bond mill and a standard Bond grind test were used to determine the model parameters. The test is performed on a sample of mass M (g) that is 700 cm3 of size class 3.35 mm. The sample is ground at times of 0.5 min, 1 min, 2 min, and 4 min. After each grinding cycle, the analysis of the PSD is determined for the sample.
Ball Mill Design/Power Calculation
Ball Mill Power/Design Calculation Example #2. In Example it was determined that a 1400 HP wet grinding ball mill was required to grind 100 TPH of material with a Bond Work Index of 15 (guess what mineral type it is) from 80% passing ¼ inch to 80% passing 100 mesh in closed circuit. What is the size of an overflow discharge ball …
Bond Work Index (Energy equation)
You need a two-stage solution, first stage open-circuit mill and then second stage closed-circuit mill. First stage, will be broken into two parts as well, you use a Bond rod mill work index for the coarse component of the ore (+2.1 mm) and the Bond ball mill work index for the fine component (-2.1 mm).
A Statistical Comparison of Bond Ball Mill Grindability Work Index …
Abstract and Figures. The purpose of this research was to statistically evaluate comparative Bond Work Index, BWi, determinations using two different commercial ball mill testing apparatus. These ...
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
Bond Work Index
Variability samples must be tested for the relevant metallurgical parameters. Ball mill design requires a Bond work index, BWi, for ball mills at the correct passing size; SAG …
Bond Work Index Procedure and Method
Bond Work Index Procedure and Method. This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the …
A Review of Alternative Procedures to the Bond Ball Mill …
The initial sample volume is 207 cm3 instead of 700 cm3; accordingly, the test can be performed on 3 kg instead of 10 kg. The procedure involves dry grinding in a closed cycle until a 250% circulating load is reached. The Bond work index is …
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. This is because work index …
Correction of Bond Ball Mill Work Index Test for Closing …
Josefin et al. (2018) gave a correction procedure of the Bond test for closing mesh size which is made of 4 steps, and we could use to correct the work index measured on a sample from one P 80 ...
Secrets of the Bond Ball mill grindability test
The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work index methodology ...
A Review of Alternative Procedures to the Bond Ball Mill …
Round 1. Reviewer 1 Report. A very focused and highly relevenat contribution to the area of ball milling and grandibility. The review suggests that a spell/grammar check be conducted prior to final submission.
Procedure for determination of ball Bond work index in …
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 modified in 1961 (JKMRC CO., 2006). This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required ...
Improved characterisation of ball milling energy requirements for …
The Bond Ball Mill Work index (BBWi) is the industry standard procedure for assessing the grindability of ores. The test involves conducting a locked-cycle grinding test using Bond's standard mill design. The locked-cycle test enables a batch process to emulate the grinding behaviour of a continuous mill with a 250% recirculating load.