### testwork: bond ball mill work index -

the bond ball mill work index is one of the most commonly used grindability tests in mining, and is often referred to as the bond work index. the test is a 'locked-cycle' test where ground product is removed from test cycles and replaced by fresh feed. the test much achieve a

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this table of ball mill bond work index of minerals is a summary as tested on 'around the world sample'. you can find the sg of each mineral samples on the other table.

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12.12.2016· 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 ¼ inch (6350

Get Price### application of operating work indices in autogenous

the corrected ball mill operating work index using this method is 13.3kwh/t, which is close to the bond ball mill work index of the ore (13.4kwh/t). the measured transfer size of 726μm produced by the ag/sag mill corresponds to an equivalent 237μm (t' 80

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w is the work index measured in a laboratory ball mill (kilowatt-hours per metric or short ton) p 80 is the mill circuit product size in micrometers; f 80 is the mill circuit feed size in micrometers. rod mill. a rotating drum causes friction and attrition between steel rods and ore particles. [citation needed] but note that the term 'rod mill' is also used as a synonym for a slitting mill

Get Price### bond work index tests - grinding solutions ltd

the bond ball mill work index (bbwi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. the 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.

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24.10.2018· the work index can either be measured in the laboratory (the bond ball mill work index determination is a common example) or it can be calculated from the operating performance of a milling

Get Price### bond work index - an overview | sciencedirect

the ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 3.36 mm (6 mesh) to product size in the range of 45-150 µm (325-100 mesh), thus determining the ball mill work index (wib or bwi).

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ball mill operatng work index effeciency-bwi bond ball mill work index on sag ground ore, kwhton ground f 80 80 passing of sag ground of the test feed size, microns p 80 80 passing from the test product size, microns p cs bond closing screen size, microns g pb ball mill grindability average of last three cycles, grrev determination of the sag and ball mill pinion ener. read more. 1022 14mm 2fl

Get Price### quick method for bond work indexapproximate

the aim of this study was to develop a new method for assessing the bond work index in a ball mill (bbwi), which is based on a first order kinetics present in the bond ball mill for grinding mineral raw materials (austin et al., 1981; ahmadi and shahsavari, 2009). theoretical basis of quick procedure grinding of various mineral raw materials in the bond ball mill occurs according to the first

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a 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

Get Price### china bond work index for rod mill

the bond work index for ball mill is a special equipment for testing bond ball mill work index. simple lab test can choose ball mill by power method or judge the effects of material properties change to the ball milling process or the operation condition of crusher by using this equipment. from 1980s, the company developed the equipment and technology in reference to technology from american

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retsch is the world leading manufacturer of laboratory ball mills and offers the perfect product for each application. the high energy ball mill e max and mm 500 were developed for grinding with the highest energy input. the innovative design of both, the mills and the grinding jars, allows for continuous grinding down to the nano range in the shortest amount of time - with only minor warming

Get Price### bond work index tests - grinding solutions ltd

the bond ball mill work index (bbwi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. the 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 600µm can be used for the testwork

Get Price### correlation between bond work index and

the 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 µm. if the breakage characteristics of a material remain constant over all size ranges, the calcul ated work index would be expected to remain constant since

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a ball mill is a type of grinder used to grind or blend materials for use in mineral dressing processes, paints, pyrotechnics, ceramics, and selective laser sintering. it works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near the top of the shell. a ball mill consists of a hollow cylindrical shell rotating about its axis. the axis of the

Get Price### ball mill - work index ball mill manufacturer from

work index ball mill, alluding to the grind ability list of metals, is utilized to demonstrate the granulating trouble of the material. it is measured by a rule that to compute the work file ball plant in light of yield of every unrest of the factory after the material is ground to an adjusted state by the predetermined plan.

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correction of bond ball mill work index test for closing mesh sizes it is commonly known that one must run the bond ball mill work index test such you pick a

Get Price### comparison of ucs to bond work indices

work index values (crushing, rod mill and ball mill). data from 11 mines located around the world is analysed for correlations between ucs and various wi values. introduction need to accurately predict future mine and mill production rates requires a knowledge of ore grindability well in advance of when ore are actually mined. traditional

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kinetic grinding test approach to estimate the ball mill work index 345 kinetic grinding exactly 700 cm3 of passing 3.35 mm material from each sample was progressively grounded in periods of 0.33, 1, 2, 4, and 8 minutes. our experience has shown that the required number of revolutions to achieve the circulating load of 250% is most likely to be between 200 to 300 rotations. however, it

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