1 Calculate the Actual Operating Bond Work Index of the grinding circuit. • Estimate the F80 and P80. • Calculate the specific work or energy input from the size reduction equipment power (relative to the pinon for tumbling mills; see Doll, 2021) and circuit tonnage (equation 1).
Grinding mill modeling has attracted the attention of a number of researchers ever since Bond published his method of energy calculation with an index called Bond work index (Bond 1961). In the 1970s, the population balance or selection and breakage function model was at the forefront of research (Fuerstenau et al. 1973).
As a fast method, the determination of the Bond index from the Hardgrove index (by calculation) is almost matching with measured Bond's work index. The Bond's work index of the above rock samples calculated from the Hardgrove index value has shown a variation from 7.7 to 10.3 kWh/sh.t. A correlation is found between the friability value and ...
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 ...
The Bond work index was then calculated to be equal to 41.38 kWh/tone. I. Introduction Comminution is the process of reducing particle size by breaking, crushing and grinding until the valuable minerals are minute enough and can be isolated by such separation methods.
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, fast and accurate procedure is introduced to find the
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Grinding is a machining process improving the surface finish of the job and producing small chips. The tool used for this process is the grinding wheel. It is a cutting tool in which millions of microscopic abrasive grains are bond together. Here, each abrasive grain acts like a spiky tool. As shown in the image, the abrasive grains are held ...
Bond proposed the following equation for finding the equivalent wet grinding work index (W i) from the Hardgrove Grindability Index : (1) W i = 435 / (HGI) ∧ 0.91. As McIntyre and Plitt noted, no data was provided to support this correlation.
One is the Hardgrove grindability index and the other the Bond work index. The Hardgrove index is determined using the ASTM method D 409–71. It involves grinding 50g of the material, e.g. coal, of specified size (16–30 mesh cut) in a specified ball-and-race mill for 60 revolutions.
The FC Bond Mill was designed by F. C. Bond for use in determining the Bond Ball Mill Index, a measure of grindability and power required to mill various ores. 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 included with each mill.
The Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes.
2.2 Bond Work Index The term standard Bond grindability method/test is a closed-cycle dry grinding and screening process, which is taken into consideration until the steady conditions are obtained [8], [9] and [10]. Fig. 1(a). View of Lucky Cement Limestone For this purpose machinery is required Figure 2 which as Ball
Keywords: Bond work index, grinding, circulating charge, composite samples * Institute for Technology of Nuclear and other Mineral Raw Materials, 11000 Belgrade, Serbia, [email protected] ** This investigation was conducted under the Project TR 33007 "Implementation of the Modern Tech-
standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu. (See reference 8 below). The comparison of these results gives context to how the various measurements relate to each
The standard Bond grindability test is a closed-cycle dry grinding and scree ning process, which is carried out until steady state conditions are obtained [11-14]. The materials of 700 cm 3 volume sample with the balls was charged to the ball
Abstract—The Bond work index is a research methodology, which is widely used for the estimation of power required to grind the materials. Keeping in view the difficulty in determining this index, many alternatives to the standard method have …
C.Heinzel(1998) "Modelling and Optimization of grinding process". Journal of Intelligent Mnufacturing pp303-314. 2.A.J. Shih, M.B. Grant, and T.M. Yonushonis (1998)"Vitreous bond CBN wheel for high speed grinding of zirconia and M2 Tool steel". Transaction of NAMRI/SME vol 26. 3.Davim J.P. 2001. "A note on the determination of optimal ...
SIMPLIFIED BOND WORK INDEX DETERMINATION By: R. O. Jauregui Kaiser Engineers International, Inc. 300 Lakeside Drive, Oakland, Ca. 94623, USA To design grinding circuits or evaluate their performance the Bond Theory of comrninution is used. Equation (1) is the mathematical statement of the Third Theory: where
grinding circuit efficiency. Bond Work Index efficiency has been widely used by industry, but until now without concise standard methods, or a formal guideline, for doing so. The Bond Efficiency SubCommittee of - the Industrial Comminution Efficiency work group of GMSG has
Determining the Bond Efficiency of Industrial Grinding Circuits is a practical GMG guideline that can be used by operators and designers to evaluate the energy usage efficiency of comminution circuits. It provides a step-by-step method for collecting samples, analyzing data and calculating the Bond Work Index efficiency ratio of a circuit for ...
Bond Grinding Circuit Efficiency Meeting of Bond Efficiency Guideline Working Group of the Global Mining and Standards Group Salt lake City, 2014 Based on Presentation to the 2008 Meeting of SME, by C.A. Rowland, Jr. and R.E. McIvor. Bond Grinding Circuit Efficiency • The Bond Work Index equation • Ore test WI • Circuit operating WI
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
2|DETERMINING THE BOND EFFICIENCY OF INDUSTRIAL GRINDING CIRCUITS Calculations: 1. Calculate the Actual Operating Bond Work Index of the grinding circuit. • Estimate the F80 and P80. • Calculate the work or specific energy input from the size reduction equipment power and circuit tonnage (equation 1). Auxiliary equipment power is excluded. P
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 …
2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP Ball-mill scale up (Bond's Law)Data: zBond work index w i zFeed D f and product d size (both 80% cumulative passing) Result: The specific grinding energy w Mill power draw P = wT, where T the mill capacity Mill dimensions (from Tables or charts)
are smaller than the characteristic size). Bond's work is notable because of its widespread adoption in the design of most modern industrial grinding circuits. Bond developed a work index function that he suggested was a measure of the crack length needed to …
Bonds: It defines the bonding strength between the abrasive particles of the grinding wheel. In grinding wheel specifications various types of bonds are classified which are represented by alphabetic characters some of them are as follow: Vitrified bond: It is also known as ceramic bonds and has high strength, hard and brittle like glass.
Bond Index & Hardgrove Grindability Index - View presentation slides online. Bond Index & Hardgrove Grindability Index
The Bond Index for Ores a You wish to estimate the size of a grinding mill without making any actual grinding tests. Using the Bond Work Index Wi for each material as given in the Lecture Notes, calculate the approximate kWhr per short ton needed to grind the following average materials from 4 mesh 4699 μm to 200 mesh 74 μm: 1