Similar 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 normally 100 mesh.The test requires calibration against the standard bond ball mill work index test to estimate the work index.
Rod mill work index has not been de ned as yet.The ball mill work index is con rmed at 16 kwht.The operating work index, though, is in the range of 21 kwht to 25 kwht showing high inef ciency.This raises the point that, in some cases, the bond ef4 oversize factor calculation is not suf cient to compensate.
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.
However, in this situation the ball mill has to supply this energy and it has a different higher work index than the crusher ie the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction.Hence from equation 7, to crush to the ball mill.
Bond ball mill.October 5, 2015.Labpilot plant equipment.This 12 x 12 ball mill is universally used for grindability testing and determination of the bond work index.Mill comes complete with ball charge, and control panel with automatic revolution counter.Leave a reply cancel reply.
Celtest have the capability to carry out the bond work index bwi test in accordance with epri report cs3612 fgd chemistry and analytical method handbook, volume 2.The bwi is used to estimate the required mill power per ton of product specific energy.The specific energy requirement.
Bond mill work index for limestone ball mill bond work indeand for limestone ball mill bond work index for limestone - gold ore crusher ball mill bond work index for limestone the zenith is the professional gold mining equipments manufacturer in the world located in china india along with other.
Modelling the specific grinding energy and ball-mill scaleup ball-mill 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.
The bond ball mill grindability test is a locked-cycle laboratory grinding test.It provides the bond ball mill work index which expresses the resistance of a material to ball milling.This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding, and for ball mill scale-up.The test has.
Work index curve for ball mill bond work index formula-equation basic equationssize distribution and exposure ratioequations for work index variationswork index and crack energy the basic work index equation isw 10 wip 10 wif1where w is the work input required in kilowatt hours per short ton to grind from 80 passing f microns to 80 passing p microns, and wi is the work index.
Submitted to the bond ball mill work index test.The number of sag mill revolutions required to grind the material to a p 80 of 1.7 mm is used to predict agsag specific energy using quation 4.Correction e factors for feed size and pebble ing are applied to.
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.
The above models are only some of the standard model sizes.The ball mill can be custom-made as per your ore information.Application the ball mill is usually applied together with the spiral classifier or hydrocyclone to form a closed-circuit during which the minerals which do not reach the separation particle size could be sent back to the ball mill for re-grinding.
Milling rod ball mills including bond ball work grindability index.Marc manufactures a wide range of ball and rod mills to suit most metallurgical laboratory applications.Our range extends from small 6l jar-type mills that are manually positioned on rollers to large 30l size mills.
Ball mill work index adjustment.The bond ball mill work index test requires the operator to select an appropriate screen size to close the test.The procedure states that the closing screen size should be such that the product size of the test is the same as the expected product size of.
The 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.
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.
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.
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 2.1 mm whereas ball mill work index bwi is used for the range from 2.1 mm down to 100 m.Adjustment of grinding parameters.
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.