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
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).
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 …
The trend of the particle size distribution line is shown by plotting its screen analysis in, such a manner that a complete homogeneous crushed or ground product will form a straight line; any curvature then indicates a natural or induced grain size. Semi-log paper is used with the percent cumulative retained plotted o…
Using the proposed equations in the literature, the predicted values of the BWi for the samples in ore zones are in the range of 6.36 – 14.44 (kWh/t), and therefore this wide range must be considered when the short-term production schedule is planned. ... Bond ball mill work index (BBMWI) test is a standard test used to measure the ball mill ...
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 the Bond work index is suggested for cases when the Bond grindability test is conducted on …
Bond ball mill test procedure were carried out on crushed (-3.35 mm / 6 mesh) material at different screen closing sizes (300 µm, 212 µm, 150 µm, 106 µm, and 75 µm). The screening process was
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 …
The result of this testing indicates that the design of the value ball BICO mill of 10.786kWhr/t mill delivers is the root cause of these higher and in less more testing variable reproducible of the BWi same results mean material. than BWi the It value is BICO postulated of ball 12.238kWhr/t mill. that As the well, differing versus the Sepor ...
The Wi value from this equation should conform with the motor output power to an average overflow ball mill of 8 ft. interior diameter grinding wet in closed ... LABORATORY PROCEDURE BOND BALL MILL WORK INDEX Grindability Test ALLIS-CHALMERS . by L D Michaud February 29, 2024 December 14, 2015 Categories …
Here, 3 models gave almost same R 2 value, but as the previous prediction equations are in the form of linear, here also linear model is considered. The prediction equation is as follows: (26) BWI = 0.34 RHN − 6.61 where, BWI = Bond's work index (kWh/sh. ton), and RHN = Rebound hardness number. Table 12.
The Bond Work Index is a factor that measures the energy consumed in size reduction operation of the ore The Bond's Work Index equation is: W=WI* (10/√P80 10/√F80)May 01, 2021 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, 101016 ...
The self-grinding work index is an extension of the concept of Bond work index. It generally refers to the work index calculated by using Bond's fracture theory on the principle of ore crushing energy consumption according to the W, F, and P data of a small or semi-industrial or industrial self-grinding test. In this kind of test, McPherson …
bond ball mill work asindexequation in wills. bond ball mill work asindexequation in wills. Bond Work Index Formula-Equation Basic EquationsSize Distribution and Exposure RatioEquations For Work Index VariationsWork Index and Crack EnergyThe basic work index equation is: W = 10 Wi/√P – 10 Wi/√F(1) where W is the work input …
The work index values apply to ball mills grinding wet in closed circuit. For dry grinding in closed circuit the work input calculated by Bond's basic Third Theory equation should be mul tiplied by 1.30 (see example 6.3.1.). ... Fine product factor (to Bond's equation); should the product size, P, be smaller than 70 microns, then the work ...
This paper describes a methodology for providing an estimation of the Bond ball mill work index for a sample of non-standard size (F 100 ≠ −3.35 mm) when all the …
Fig. 1. Ores for the work index test: a) type and b) feed size 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);
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, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and …
Characterization and Comminution Studies of Low · Bond Work Index A standard 12″ × 12″ oratory Bond ball mill was used to conduct the index experiments About 50 kg of each of the BHQ and BHJ samples was prepared in −335 mm size by a jaw crusher followed by a roll crusher Size analysis results for the crushed products of the BHQ and BHJ samples …
The exponent a for Bond equations is 0.535 and the exponent a for Morrell equations is 0.666. This is the value that is entered into the Circuit Configuration settings. ... The laboratory ball mill work index result is read from the database (P 80, P 100, F 80, and gpr; if multiple results exist with a particular sample name, then the averages ...
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 laboratories throughout the world. A copy of Fred C. Bond's Method of Crushing and Grinding for determination of the Bond Index is …
A execução dos ensaios para determinação do BWI descrita neste trabalho foi baseada nas metodologias publicadas por Fred C. Bond em Bond (1952) e Bond (1961, na releitura da norma brasileira ...
The Bond Work Index is a common technique for the estimation of hardness and energy requirement for comminution using ball mills. However, this technique is time-consuming (close to 5 hours) and liable to experimental errors. This work contributes to obtaining new models for rapid Bond Work Index estimation using non-standard dimensions mills.
The three tests are: 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 from a feed size of approximately 10 mm to a product size on the order of 1 mm. The Bond crushing …
Bond's equation is one of a much larger family of equations that includes the classical grindability models of P.R. von Rittinger and E. Kick, according to Hukki (1962). Hukki's …
A new fast way to determine the Bond work index method is proposed to ball mills. • It is possible to determine the work index using a 3 kg sample and 5 min time. • Use only one grind and the population balance model to predict the work index. • The values estimated for SSE are less than 0.4.
The goal of this work is to create an equation to adjust a Bond ball mill work index from one P80 basis to another. The proposed model consists of two components, the variable coefficient that is ...
Bond´s work index estimation using ... change in particle size has been studied with the following differential equation (Charles, 1957; Wills, ... Bond ball mills are popular and widely ...
