A new method of simulatingthe calculation of the Bond rod-mill work index by using thegrindingkinetic test data of the feed is proposed. 1.INTRODUCTION Bondwork indices are widely used to select and size the crushing and grindingequip- ment, to estimate the efficiency of the crushing and grinding process, and to calculate grindingmedia,power and steel consumption, etc.

Get PriceThe Work Index calculated from the testing can be used in the design and analysis of ball mill circuits. The test requires a minimum of 10kg of sample that has been stage-crushed to passing size of <3.35 mm. Any screen size below 600Β΅m can be used for the testwork depending on your requirements. Bond Rod Mill Grindability Test

Get Pricegrinding cycles. The Bond Work Index is calculated using the formula: π=1,1 44,5 ππ 0,23πΊ,82(10 βπ80 β10 βπΉ80) (1) where W i β Bond work index (kWh/t) P c β test sieve mesh size (Β΅m) G β weight of the test sieve fresh undersize per mill revolution (g/rev) F 80 β sieve mesh size passing 80% of the feed before ...

Get Price* Bond F. C., "Crushing Tests by Pressure and Impact", Trans AIME, Vol 169, 1947, pp 58-66. 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.

Get PriceThe 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 Β΅m. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work ...

Get PriceGenerally, 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

Get PriceBond Grinding Circuit Efficiency β’ The Bond Work Index equation β’ Ore test WI β’ Circuit operating WI β’ Grinding circuit WI Efficiency β’ Example calculations β’ Data base examples β’ Conclusions 2. 2/20/2014 2 The Bond Equation 3 The equivalent energy needed to go from very large rock to 100 um, i.e. a standard amount of size reduction! The Bond Equation 4. 2/20/2014 3 The Bond ...

Get Price* Bond F. C., "Crushing Tests by Pressure and Impact", Trans AIME, Vol 169, 1947, pp 58-66. 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.

Get PriceBond Work Index. 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 310), a question arises as to whether this practice will alter the ball mill work index (BW i ...

Get PriceBond Work Index in different mass propor-tions. He found out that these values are always lower than the Bond Index obtained as the mean calculated Bond work index value of mixture components by their mass portion. Ipek et al. (2005) have carried out the Bond work index measurements by .

Get PriceA Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample Requirements: A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred. JKTech would stage crush the sample to minus 3.35 mm, as required for the Bond Ball Mill Work Index test feed.

Get PriceBond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mΒ΅ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod Β΅ mill (circuit) product size of 1,000 Β΅m. W1 = 9.5 x [(10 / β 1,000) β (10 / β 19,300)] = 2.32 kWh/t

Get Price12.12.2016Β Β· Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ΒΌ inch (6350 ...

Get PriceA Bond ball mill work index is then performed on the mill product for the design of SAG-ball mill circuits. This is important because it was found that there was a 1β1.5 kWh/t higher ball mill work index if the β3.35 mm ball mill test feed size is obtained by SAG mill grinding compared with crushing.

Get PriceThe 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 ...

Get PriceThe Bond Work Index is calculated using the formula: ... Table 1. Bond's mill specification and grinding conditions Mill diameter, D m, cm 30.48 Mill Length, L m, cm 30.48 Number of mill rotations in minutes, n, min-1 70 Mill balls weight, M b, kg 21.125 Geometry of mill liner smooth Grinding type dry V ore, cm 3 700 Andesite and limestone samples were prepared by crushing in a laboratory jaw ...

Get PriceThe Bond work index, Wi, is defined in a Bond ball mill on the samples of standard size β 3.327 + 0 mm. In practice, it is possible to find materials of non-standard size that are finer than 3 ...

Get PriceThe work index . W. i. was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. The calculation is based on the size-energy relationship . 1,2 21. 11. nn. eC. x, which for . n = 0.5, x. 1 = β and . x. 2 = 100, by definition gives . e β,100 = W. i. and consequently . C = 10. W. i. In theory, for a given ...

Get Price1 Introduction Finding the bond work index of an ore type is crucial to determining the grinding energy required during comminution in a ball mill. The bond work index is a constant characteristic related to the hardness of a specific ore type. Bond work index is one of three different approaches that can be used to calculate the work index of an ore.

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