Processing capacity:238-473t/h
Feeding size:≤24mm
Appliable Materials: quartz,silicate,refractory material,non-ferrous metal,ore,glass etc. All grindable materials, various metal ores, non-metallic ores, non-flammable and explosive materials
The reason for this variation in ball mill work index is because the ore at mt milligan has an intrinsic exponent of 045 in the 100 m to 200 m size range not the 050 exponent empirically measured by f bond
Ball mill for bond inde manganese ore mill bond work inde the bond work index wi is defined in a bond ball mill on the bond work index procedure and method this grindability test or bond ball mill work index procedure is used to determine the bond work index of minus six mesh or finer feed ore samples these equation application methods are used to process lt12 ore samples in a ball mill using
3 standard bond tests the 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 to break from infinite size to a product size of 80 passing 100 m if the breakage
Where cf is the essbm calibration factor in the circuit settings for ball mill operating work index versus laboratory ball mill work index a value of zero means use the bondrowland ssbm formula to predict e ball a value of 005 means use 5 less than bondrowland ssbm formula to predict e ball cf is a negative number if wi o is less than
The ores bond work index which will define the power requirements per tonne of rock to achieve the required product specification from the mill this sets the basic power draw for your application and can then be used to simulate the various milling options and stages that maybe required for the downstream processing steps
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
Bond ball mill work index c wi bond crusher work index d hpgr roll diameter m e sp net specific energy consumption kwht f hpgr hydraulic pressing force kn f 80 particle size at which 80 of particles pass in feed f sp 2hpgr specific pressing force nmm l hpgr roll length m or mdot hpgr specific throughput constant tshm3
Oct 24 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
Limestone bond ball mill work index pdf alternative approaches for determination of bond work index on with the bond s work index hardgrove index and brittleness tests on six in recent the brittleness testfriability value of bauxite lizenithne barite marble f80 is the size in microns at which 80 percent of the new feed to ball mill
It is not recommended to use ucs as a proxy for the bond crushing work index or vice versa if you insist on doing so there are several potential regression equations above that you may choose
Apr 17 2013 ball mill bond work index for limestone ore beneficiation plant the bond work index indicates a relative grindability of the limestonethe work index number is developed by grinding a small sample of the material in a more detailed
In conjunction with the bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing ag and sag mills ball mills rod mills crushers high pressure grinding rolls hpgr
The bondop work index spreadsheet was designed to estimate the operational work index of a given grinding installation of known dimensions and operating conditions based on the traditional bonds law and the hogg amp fuersteneau power model see mill powerball mills spreadsheet for further details on such model
Ball mill specification number a process data sheet xxxxxxxxxx sheet no 1 of 2 area xxx client operating centre jakarta no 1 working 1 service rom ball mill item no 1 of standby 0 xxxxml001 2 manufacturer model type and number 3 operating conditions 4 material handled crushed ore 5 hazard considerations yes x no type 6 design conditions feed product
The reason for this variation in ball mill work index is because the ore at mt milligan has an intrinsic exponent of 045 in the 100 m to 200 m size range not the 050 exponent empirically measured by f bond
Safety is a prime consideration for all alsto equipment and the bond index ball mill is supplied equipped with acoustic enclosure the ball mill is designed to accept a ball charge in accordance with f c bonds standard this ball charge consists of 286 balls as follows 44 x 35mm balls 67 x 30mm balls 10 x 254mm balls 71 x 1905mm balls and
Ball mill for bond inde manganese ore mill bond work inde the bond work index wi is defined in a bond ball mill on the bond work index procedure and method this grindability test or bond ball mill work index procedure is used to determine the bond work index of minus six mesh or finer feed ore samples these equation application methods are used to process lt12 ore samples in a ball mill using
Ball mill instruction manual pdf ball mill diagram sheet pdf the software to view and print adobe acrobat pdf is available for free from the adobe website follow the provided icon link to download acrobat reader 39550 220440v 3 phase 60 cycle 39550x
Test data from the bond ball mill work index test is used to calculate the fine grinding index m ib the m ia and m ib indices are used to calculate specific energy for the coarse w a and fine w b components of the total grinding specific energy at the pinion w t according to equation 7 w i 4km ipfpfff 6 w t w
The widespread occurrence of bonds theory is owing to bonds method of ore strength assessment that allows finding work indexes under laboratory conditions 4 theoretically the work index equals the amount of energy kwht consumed to comminute 1 t of infinite size material down to 80 content of 100 m size grade
Dec 08 2019 characterized using xrd xrf and electron and optical microscopy a simulated test method for bond ball mill work index bwi was used to perform the comminution test the results showed bwi values vary from 567 kwht to 2021 kwht examination of the possible correlations between bwi and the geological features
It is not recommended to use ucs as a proxy for the bond crushing work index or vice versa if you insist on doing so there are several potential regression equations above that you may choose
Test using ballrace test mill was performed knowing the hardgrove indices the bond work indices of some samples were estimated using the aplans formula the approximate work indices were determined by running a batch drygrinding test using a laboratory ball mill finally the work indices obtained from both methods were compared
Bond ball mill work index testing returned a value of 854kwht identifying the sample as relatively soft and amenable to a simple comminution circuit design a detailed froth flotation study focussed on the production of a bulk cupb concentrate as well as zinc pyrite and barite products
And its correlation as a fast method the determination of the bond index from the hardgrove index by calculation is almost matching with measured bonds work index the bonds work index of the above rock samples calculated from the hardgrove index value has shown a
Sep 08 2013 the difference between the energy index and the bond work index is that the bond index is intended for use with actual mills whereas the energy index is directly obtained from the results of laboratory mills however the energy index is directly related to the bond work index by the formulawork index c energy index where c is a constant
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
We require a minimum of the feed size f80 product size p80 bond ball mill work index kwhmt feed rate tonshr and ore specific gravity tm however we would prefer to have more detail so that a proper mill sizing assessment can be completed please complete the
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 the test much achieve a
The bond work index of limestone and andesite mixtures abstract this paper investigates grinding of mineral mixtures with different grindabilities in the bond ball mill understanding the ore mixture grinding is of great importance in mineral processing table 1 bonds mill specification and grinding conditions mill diameter d m cm 30
Ball mill for bond inde manganese ore mill bond work inde the bond work index wi is defined in a bond ball mill on the bond work index procedure and method this grindability test or bond ball mill work index procedure is used to determine the bond work index of minus six mesh or finer feed ore samples these equation application methods are used to process lt12 ore samples in a ball mill using
With the bonds work index hardgrove index and brittleness tests on six typical rock samples these studies were carried out in a standard ball mill 300 mm x 300 mm size the grinding media with steel balls weighing 20125 kgs has been used the details of the number of balls used its sizes are given below no of balls size mm 43 3683
Bond ball mill work index bwi kwht 134 bond rod mill work index rwi kwht 181 table 1 example of agsag ball mill circuit wio calculations 1 2 abstract optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have
Keywords laboratory ball mill bonds equation shaft power milling efficiency gjrea classification for code 120499 to be the work index of limestone which is 116 kwht with a specific gravity of 26 gcm 3 or 2600 kgm 3 the feed size f 80 of the ball mill was assumed to be 2 mm
Nov 01 1998 rowland ca 1978 determination and use of operating work indices in controlled grinding circuitsa proposed concept mill operators conference and exhibit northwestern branch australasian institution of mining and metallurgy mt isa queensland australia june
Bond designed the work index ball mill with strict dimensional and functional specifications and developed the experimental methodology for determining the work index in a laboratory the method
Aug 01 2005 the bond work index is one of the most useful and interesting parameters used in designing grinding equipment however it must be obtained under restrained conditions especially in regards to the bond standard lab mill the main objective of this study is to show how this index can be obtained using a denver ball mill which is present in most mineral processing laboratories
Oct 15 2015 the particle size range of the biomass particles prior to densification was obtained using the british standard bs en 161262012 2 litres of boiling deionised water was poured over 300 1 g of each pellet sample and then soaked for 24 h the samples were then dried at 3560 c until they reached 515 moisture contentthe samples were then split into two portions 150 g was used to
The grinding jar of the bond index ball mill measures 12 x 12 and has wellrounded corners 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
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
Ball mill specification number a process data sheet xxxxxxxxxx sheet no 1 of 2 area xxx client operating centre jakarta no 1 working 1 service rom ball mill item no 1 of standby 0 xxxxml001 2 manufacturer model type and number 3 operating conditions 4 material handled crushed ore 5 hazard considerations yes x no type 6 design conditions feed product
Test is stated in bond 1961 the work index for a ball mill wi is then calculated from the following equation 7 where p is the closing sieve size m gbp is the grindability net grev f80 and p80 are the 80 passing size of the feed and the product m respectively
Jun 06 2015 the work index bwi is calculated according to fred bonds equation bond work index for testing procedure 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
Bond work index test ball mill us 13800 the fc bond work index test ball mill was designed by f c bond for use in determining the bond index a measure of grindability and power required for grinding applications the fc bond mills are used in laboratories throughout the world a copy of fred c bonds method of crushing and grinding for determination of the bond index is included with each
Jk bond ball mill test since its introduction in the 1960s the bond ball mill work index bbmwi parameter has been extensively used in predicting ball mill power draw use of work index along with comminution circuit design the work index parameter is widely used in tracking mill performance due to the age and lack of controls for the test
Jul 15 2013 ball mill grindability test was conducted by standard practice using 100mesh 150 pm closing screens the ball mill work index is shown below bm wi kwhrst 1797 bm wi kwhrmt 1981 bond ball mill
The ability to simulate the bond work index test also allows examination of truncated ball mill feed size distributions on the work index for grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill see figure 310 a question arises as to whether this practice will alter the ball mill work index bw i of the material
Grinding cycles the bond work index is calculated using the formula
Bonds mill specification and grinding conditions mill diameter d m cm 3048 this study aims to develop a new approach toward estimating the bond ball mill work index bbwi by
Bond test wis kwht rod mill ball mill 95 kwht8 9 kwht bond standard circuit work index assume the rod mill work index of 95 applies from the actual rod mill feed sizeof 19300 m although some of this work might ideally be done by crushers to achieve a rod mill f80 of 16000 m to a rod
The bond work index determination according to the standard bonds test is done on all these samples with comparative sieve size of 74 105 and 150 microns the bond work index is calculated using the formula bond 1961 1 where w i bond work index kwht p c test sieve mesh size m
Nov 01 1998 rowland ca 1978 determination and use of operating work indices in controlled grinding circuitsa proposed concept mill operators conference and exhibit northwestern branch australasian institution of mining and metallurgy mt isa queensland australia june