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Cleaning and Storing of Ball Mill Charge after the Bond Work Index Procedure is done Add about 500 g of silica sand into the mill containing the ball charge Seal the mill Rotate for 20 revolutions to clean Empty the mill charge and sand into the ball try once grinding is complete Clean out
Chat OnlineBond Ball Mill Grindability Test The Bond Ball Mill Work Index BBWi test is carried out in a standardised ball mill with a predefined media and ore charge The test requires a minimum of 10kg of sample that has been stagecrushed to 100 passing size of 335 mm
More DetailsThe 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
More DetailsThe standard Bond Ball Mill Work Index test procedure is firstly to stage crush the feed to minus 335mm and size a representative sample The test then involves a series of batch grinds in a standard Bond mill A Bond mill is 0305m by 0305m with rounded corners a smooth lining and runs at 70rpm
More DetailsThe 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
More DetailsBall mill design requires a Bond work index BWi for ball mills at the correct passing size SAG mill design requires an appropriate SAG test for example SPI Chapter 5 Flotation design needs a valid measure of kinetics for each sample including the maximum attainable recovery and rate constants for each mineral Chapter 12
More DetailsSimilar to a Comparative Work Index this test is an open circuit dry batch grindability test run in the standard Bond Ball Mill for a set time It can be used at mesh sizes from 65 to 200 mesh
More DetailsThe Bonds standard ball mill is used to determine the work index value of differ ent samples The Bond work index is defined as the kilowatthours per short ton required
More DetailsThe Bond work index Wi is defined in a Bond ball mill on the samples of standard size − 3327 0 mm
More DetailsThe 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
More DetailsThe Bond Index conforming ball charge consists of 43 x 145” balls 67 x 117” balls 10 x 1” balls 71 x 075” balls 94 x 061” balls The optimum number of grinding balls is 285 However the ball diameters vary due to wear Therefore the total ball number should be adjusted from time to time to ensure a total mass of 20125 grams The grinding jar of the Bond Index Ball Mill measures 12″ x 12″ and has well
More DetailsThe Bond’s BallMill Work Index is a measure of the resistance of the material to grinding in a ball mill This Index is widely used in the industry for comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill scaleup
More Details2 the operating work index Wio of an existing grinding circuit can be calculated given known mill power draw throughput feed and product size distributions kWht Power applied per ton of feed to the grinding unit Wi The standard Bond work index of the ore P 80 The 80 cumulative passing size of the product in microns F 80
More DetailsThe Bond work index W i is widely used in the mineral industry for comparing the resistance of different ores to ball milling and can be used to estimate the energy re quired for grinding
More DetailsBond rod and ball mill work indices are readily converted to pinion energy for rod and ball mills but not for SAG mills Reproducibility while not studied in this paper is
More DetailsRod mill work index is used in the BondBarratt specific energy consumption model The work index is used to calculate the energy requirement to grind rocks in the medium size range from 10 mm 20 mm down to about 2 mm
More DetailsAccording to the Bond standard procedure the work index is determined by simulating a dry grinding in a closed circuit in the Bond ball mill to achieve 250 circulating load Bond 1949 1952 1961 The test is performed on a raw material approximately weighing 10 kg which coarseness is 100 3327 mm
More Detailsthe work index depending on the grind size In this way work index values are usually obtained for some specific grind size that characterizes the grinding operation to design or under evaluation This study was carried out in a standard bond ball mill 305 mm x 305 mm size
More Detailsare the Bond Work Index Wi values Bond 1952 divided into a low energy crushing work index Wi C for coarse rocks 7550 mm a rod mill work index Wi RM for intermediate sized particles 253 mm and a ball mill work index Wi BM for small particles 3 mm Ammtec 2000 Laboratory
More Detailsfor design and development of multiple type of mills One of them is Bond Work Index having association with ball mill and second one is Hardgrove Index which shows strong association with Vertical Spindle Mill The best experiment is standard Bond Work Index BWI which associates the energy or intensity of energy required to
More DetailsBall mill Ball mills normally operate with an approximate ball charge of 30 Ball mills are characterized by their smaller comparatively diameter and longer length and often have a length 15 to 25 times the diameter The feed is at one end of the cylinder and the discharge is at the other
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