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The study shows that work index of Birnin Gwari iron ore can be taken as Kwh/ston Kwh of energy is required to reduce one ton of Birnin Gwari iron ore from 80% passing It is hereby recommended that the value of work index obtained in this study should serve as a

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Hardgrove grindability index iron ore the bond ball mill grindability test is designed to give a measure of the grinding characteristics of a material by finding the amount of size reduction resulting from a controlled energy input ball mill grindability of a material depends upon its hardness structure the manner in which it is fractured

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Hardgrove grindability index iron ore Iron Ore Crusher Selection Criteria Work Index Grindability Iron ore crusher selection criteria work index grindability Request for Quotation The Bond standard grindability test provides a Work Index that is widely used to estimate the energy required for grinding but the test Pretreatment of rocks prior Get Price List Chat Online Our News Our

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Hardgrove Grindability Index short HGI is a measure for the grindability of coal Grindability is an index therefore it has no unit The smaller the HGI the harder is coal texture and less grindable is the coal Grindability is an important factor for the design a coal mill As grindability depends on many unknown factors HGI is determined empirically using a sample mill according to the

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hardgrove grindability index iron ore The resulting Hardgrove Grindability Index HGI provides a measure of energy required in a grinding process or a measure of yield for a given energy input A prepared 50g sample of No 16No 30 sieve size coal and eight 1in 254mm diameter polished steel grinding balls are placed in a stationary bowl having a machined circular track

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Metallurgical ContentBasic EquationsSize Distribution and Exposure RatioEquations for Work Index VariationsWork Index and Crack Energy What is the Bond Work Index Formula Equation In case you had forgotten here is a classic You can read all the details of this now Biblical grinding power requirement calculation formula in Fred Bond s original paper You can also review the step by

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grindability index iron ore Improved Grindability of Iron Ores using Standard Bond grindability tests showed that microwave heating reduced the work index of iron ores by to pct

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hardgrove grindability index tester hardgrove Hardgrove Grindability Index Tester for coal sample grindability test Typical applications This machine takes grinding law as the theoretical basis the energy consumed in grinding coal is proportional to the new surface

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The Hard grove method ismostly used to determine the grindability ofcoal but also in determining grindability ofother raw materials Bond s method is used toevaluate the rock grindability 4 HARDGROVEGRINDABILITY INDEX HGI • The Hardgrove Grindability index is designed todetermine the ease with which coal can bepulverized •

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The Hardgrove Grindability Index was developed in the 1930s from experimental work by R Hardgrove to determine the relative difficulty of reducing various coals to a particle size required for

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Bond Work Index BWI & Hardgrove Grindability Index HGI tests for biomass & coal BWI can predict the potential for mill choking of biomass in a tube and ball mill HGI is a poor method of predicting grindability of biomass in vertical spindle mills

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And thus the grindability of the iron ores was investigated The results obtained are as follows 1 The work indices of the iron ores are ranged from to The work indices of the Santa Barbara ore the Santa Fe ore and the Chile ore are greater than 17 and these ores are remarkably hard

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Empirical index of grindability of ores or minerals reached as result of comminution of a test sample under stated conditions of control Hardgrove test This test utilizes a special grindability mill of the ringandball type in which a 50gm portion of closely sized coal is

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