The proposed grindability test uses a Bond standard test mill and a quantity called the “equivalent energy per minute” which is the energy per minute that would be used by the mill if it were scaled up to a wetgrinding industrial mill of 8″ diameter
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Get PriceThe standard Bond grindability test is a closedcycle dry grinding and screening process which is carried out until steady state conditions are obtained This test was described as follows The material is packed to 700 cm 3 volume using a vibrating table
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Get PriceThe most widely known measure of grindability is Bond’s work index of grindability The Bond grindability is empirically related to the energy requirement at the pinion shaft of industrial tumbling mills and thus is useful for mill sizing on the basis of predicted mill power to give a desired capacity in normal closedcircuit grinding operations
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Get PriceThis Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples These equation application methods are used to process 12″ ore samples in a Ball Mill using a standard ball charge
Get PriceThe obtained values of the Bond work index grindability for low grade as well as highgrade copper ore clearly indicate that grainsize distribution of the starting sample of size class –335 mm defined by the coefficient of line direction m affects the value of resistance to comminution
Get PriceThe Bonds grindability test WI can be used to determine the work index of any type of ore or material But the process is tedious and long time consumption The laboratory determination of Hardgrove grindability index HGI is less time consuming than that of the selectionforbreakage function On the other hand impact strength
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Get PriceThe Bond grindability tests were performed with the −6 mesh dry feed materials in a standard ball mill 305 × 305 cm following a standard procedural outline described in the literature The packed bulk densities of the Bond test feeds for clinker and trass were 144 and 164 gcm 3 respectively
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Get PriceDEPENDENCE OF THE BOND WORK INDEX OF GRINDABILITY No 4 2013 Mining Metallurgy Engineering Bor71 Figure 1 Grainsize distribution of the final crushing products of lowgrade and highgrade copper ore Figure 2 Grainsize distributions of the starting samples of size class 335 mm for determining the Bond work index of grindability Get Price
Get PriceThe Hardgrove Grindability Index HGI is a measure of coal’s resistance to crushing Grinding studies and the resulting HGI allow many different types of coal users to evaluate how coals will perform in their mills allowing them to estimate grinding power requirements and throughput capacities
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Get PriceA New Approach to Bond Grindability and Work Index Dynamic Elastic Parameters Article in Minerals Engineering 163211217 · March 2003 with 836 Reads How we measure reads
Get PriceBond Work Index FormulaEquation Basic EquationsSize Distribution and Exposure RatioEquations For Work Index VariationsWork Index and Crack Energy The basic index equation isW 10 Wi√P 10 Wi√F1where W is the input required in kilowatt hours per short ton to grind from 80 passing F microns to 80 passing P microns and Wi is the index or the grinding resistance parameter
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Get PriceDEPENDENCE OF THE BOND WORK INDEX OF GRINDABILITY No 4 2013 Mining Metallurgy Engineering Bor71 Figure 1 Grainsize distribution of the final crushing products of lowgrade and highgrade copper ore Figure 2 Grainsize distributions of the starting samples of size class 335 mm for determining the Bond work index of grindability Get Price
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