In this thesis the common Bond ball mill grindability test is conducted on three different sample materials The samples show good variability in terms of mineralogy and grindability Along with the Bond test the Mergan ball mill grindability test is also conducted on the same sample materials The Mergan test is faster than the Bond test
Get Pricebond s work index ball mill alsds 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 lockedcycle test where ground product is removed from test cycles and replaced by fresh feed Get Price
Calculate a Mills Operating Work Index Grate Discharge mills will not face this issue C This value represents the Volumetric Fractional Filling of the Voids in between the balls by the retained slurry in the mill charge As defined this value should never exceed 100 but in some cases particularly in Grate Discharge Mills it could be lower
Oct 19 2017 Bond formula for the grinding balls size calculation Past experience of a ball mill It is possible to calculate the grinding media average diameter formed in the mill operation during grinding media unload from mill the grinding balls bulk weight in fully unloaded mill Other enterprises
The Bond ball mill work index test is thought to be additive because of its units of energy nevertheless experimental blending results show a nonadditive behavior The SPIR value is known not to be an additive parameter however errors introduced by block kriging are not thought to be significant
Mill Ball Mill Closed circuit crushing to 16 mm Open circuit 8 dia rod mill to 1 mm Closed circuit 8 dia ball mill to P80 um The ore Test Work Index Circuit Operating Work Index 9 The Standard Bond Circuit Coarse Ore Bins Fine Ore Bins Screen Crushing Screen Classification Rod Mill Ball Mill THIS IS THE REFERENCE BASIS FOR ALL WORK
From this concept came two equations a the equation to determine the Work Index from Bond grindability tests and b the Bond equation which uses the Work Index to determine the energy needed for grinding
determination of the work index for ball and rod mills in 1952 and modified it in 1961 The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250 circulating load The standard procedural outline of the test is stated in Bond 1961 The work index for a ball mill Wi is then calculated from the following equation
Bond Index Test Test conducted on a Bond Index testing mill BicoBraun USA 700ml of sample milled for 100 revolutions New number of revolutions is calculated to produce fines equal to 135 of the total charge of the mill The Bond Work Index W i expresses the resistance of the material to
Bond Index Ball Mill Rod Mill BT 100 XL RETSCH The grinding jar for the Bond Index Rod Mill is 12 x 24 in size and has a waveshaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill
Ball mill A typical type of fine grinder is the ball mill A slightly inclined or horizontal rotating cylinder is partially filled with balls usually stone or metal which grind material to the necessary fineness by friction and impact with the tumbling balls Ball mills normally operate with an approximate ball charge of 30
The Bond work index Wi is defined in a Bond ball mill on the samples of standard size 3327 0 mm
2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP Ballmill scale up Bonds LawData 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
be used to calculate Mergan work index but this Mergan work index differs from the Bond work index Therefore it is needed to analyze if the Mergan work index correlates with Bond work index All the testwork was conducted using Outotec Mergan and Bond ball mills at Outotec Research Center located in the city of Pori Finland
The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions
The basic parameters used in ball mill design power calculations rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum
The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100 passing 336 mm 6 mesh to product size in the range of 45150 m 325100 mesh thus determining the ball mill work index Wi B or BWi The work index calculations across a narrow size range are conducted using the appropriate laboratory work index determination for the material size of interest
Ball Mill chinaminingproject Ball Mill Ball Mill an energy saving grinding device is widely used in mineral processing building materials and chemical grinds material by rotating a cylinder with steel grinding balls causing the balls to fall back into the cylinder and onto the material to be ground
Feb 5 2015 and 1984m and ball mill discharge was 1899 and 1701m respectively with work index of 1513kwh short ton was used to calculate the work index of the test material which was KEYWORDS Bonds index Arufu Lead Ore modified reference mineral mineral as separated particles Wills 2006
Measuring ore grindability in balls mills The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions
Bond F C Crushing Tests by Pressure and Impact Trans AIME Vol 169 1947 pp 5866 Bond Rod Mill Grindability Test The test determines the Bond Rod Mill Work Index which is used with Bonds Third Theory of Comminution to calculate net power requirements when sizing ball mills Various correction factors may have to be applied
The grinding jar for the Bond Index Rod Mill is 12 x 24 in size and has a waveshaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill The Rod Mill Work Index RWI is used for particle size determination in a size range from 25 mm down to 21 mm whereas Ball Mill Work
grindability is Bonds work index which is defined as the resistance of the material to grinding The standard equation used by them for the ball mill work index Bond work index is as follows 230 82 1 10 80 10 80 445 1 P G P F W i bg i u 4 In designing and optimizing a milling circuit using Bond
Ball mill A typical type of fine grinder is the ball millA slightly inclined or horizontal rotating cylinder is partially filled with balls usually stone or metal which grind material to the necessary fineness by friction and impact with the tumbling balls Ball mills normally operate with an approximate ball charge of 30
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
In this thesis the common Bond ball mill grindability test is conducted on three different sample materials The samples show good variability in terms of mineralogy and grindability Along with the Bond test the Mergan ball mill grindability test is also conducted on the same sample materials The Mergan test is faster than the Bond test
Kinetic grinding test approach to estimate the ball mill work index 343 The W i parameter is obtained from Bonds ball mill grindability test Bond 1961 This test is performed according to the standard Bond procedure which proposed model is presented in Eq
The Bond Ball Mill Grindability test is designed to give a measure of the grinding characteristics bond crushing law definition Grinding Mill China Get Price And Support Online bond work index for an ultrafine mill bond ball mill grindability difine bond ball mill work index equation in wills equipment for
Conveyor Belt Stone Crusher Drying Machine Cone Ball Mill Linear Vibrating Screen Vibrating Screen Rod Mill Grinding Machine Raw Material Mill Slag Powder Grinder Mining Equipment Concrete Crusher Gravel Crusher Coal Crusher Crushing Plant Rock Crusher Rolling Mill Primary Crusher Froth Flotation Grinding Mill Crushing and Screening Sand