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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
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Read MoreJul 30 2020 the jk bond ball mill jkbbm test is a locked cycle grindability test conducted using a standard laboratory bond ball mill with the same steel ball charge and material feed size 100 passing 335 mm as the bond ball mill work index test
The standard bond test to establish an empirical work index for single stage ball milling utilized a 12 x 12 ball mill to batch grind a dried sample of the bond ball mill work index for post lab discussion
The smc test stored in the dwt testwork table smc is a drop weight test bond ball mill work index the method requires all the elements of the ball mill work index test to be filled in ball mill wi test closing screen size umclosing m ball mill wi test product size p 80 m ball mill wi test feed size f 80 m ball mill wi
First a jar mill grindability test requires a 5 lb 2 kg sample and produces a direct measured specific energy net hphrt to grind from the design feed size to the required product size the second test a bond work index determination results in a specific energy value net hphrt from an empirical formula
The standard bond test to establish an empirical work index for single stage ball milling utilized a 12 x 12 ball mill to batch grind a dried sample of the ammtec bond rod mill work index bond ball mill work index and bond abrasion index are carried out on sub samples cut from the main tumbling test
Rod mill work index test for these purposes chose a o closing screen for the ball mill test one standard square root of 2 series mesh size coarser than the plant ball mill circuit p80 if between standard mesh sizes the finer of the chose two results of bond ball mill tests conducted with closing
Nbsp 0183 32 with the vcr gsl can now offer grinding test work from agsag design through bond ball and rod work index and then further down in size with the jar mill and smd isa and higmill gsl s expanded gravity separation equipment gives them full capability from spirals and tables down to fine separation via multigravity separator mgs and falcon enhanced gravity separators
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 characteristics of a material remain constant over all size ranges the calcul ated work
Bond estimated the amount of wear in terms of kilograms per kwh based on the abrasion index a ie wet ball mill kg kwh 016a i0015 033 dry ball mill kg kwh 0023a i 05 replacement ball size rowland and kjos proposed the use of their equation for the determination of the initial and replacement media size
The bond abrasion test determines the abrasion index which is used to determine steel media and liner wear in crushers rod mills and ball mills bond developed the following correlations based on the wear rate in pounds of metal wearkwh of energy used in the comminution process
Bond ball mill work index efficient thickener efficient thickener hydraulic motor driving center thickener hydraulic motor driving center thickener grid type ball mill grid type ball mill submerged slurry pump submerged slurry pump agitation tank for chemical reagent
Jktech laboratory services bond ball mill index test brmwi a bond ball mill index test bbmwi is a standard test for determining the ball mill work index of a
Bond ball mill index test jktech a bond ball mill work index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits 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 335 mm as required for the
Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the bond ball mill work index and the bond rod mill work index these are empirical indices determined by close circuit grindability tests developed by fcbond in the mid 1930s
1 introduction a bond ball mill work index test is a standard test for determining the ball mill work index of a sample of ore it was developed by fred bond in 1952 and modified in 1961 jkmrc co 2006this index is widely used in the mineral industry for comparing the resistance of different materials to ball milling for estimating the energy
Kinetic grinding test approach to estimate the ball mill a simple yet practical alternative for the standard bond methodkeywords work index bond method kinetic grinding test grindability ball mill introduction the standard bond 1952 1961 method is widely used in the course of design selection scale up energy
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
B is the composite of ef factors for ball milling rowland 1982 excluding ef3 spi the sag power index spi test starkey amp dobby 1996 uses a benchscale sag mill test to determine the specific energy of an industrial sag mill the test is operated in closed circuit and the time required to
The 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
The dm test has been based on the apparatus used for the texas ball mill test the test method involved the testing of four representative subsamples of about 35 kg each performance related results have shown that if the durability mill index dmi based on the product of the maximum plasticity index and the maximum p245 remains below 100
Ball mill work index tests using crushed feed and standard autogenous grinding design sagdesign tests patented by outokumpu see reference 8 below the comparison of these results gives context to how the various measurements relate to each other and how they can be used to obtain an accurate design for the grinding mills required for
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 12 ore samples in a ball mill using a standard ball charge below describes in general terms the bond work index procedure used by a professional metallurgical testing laboratory if you
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 steadystate before completion sample requirements
The bond ball mill work index bbwi test is carried out in a standardised ball mill with a predefined 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 stagecrushed to 100 passing size of 335 mm
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 mill
It is commonly known that one must run the bond ball mill work index test such you pick a closing mesh to give a p80 close to desired grind size this is because work index frequently changes as a function of the product size in comminution if target grind size during a project is changed or if
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
Ball mill work index test was widely used in the 1960s and still remains in use today gharehgheshlagh 2016 the ball mill work index of the feed samples was determined according to the standard
Bond ball mill grindability test the test determines the bond ball mill work index which is used with bonds third theory of comminution to calculate net power requirements various correction factors may have to be applied w wi 10p 10f where w net power consumption in kwht wi bond work index either imperial or metric units
Coarse ore work index and is provided directly by smc test for fine particle grinding equation 1 is written as f x f x 3 2 b ib 4 3 w m x x 2 5 where x 2 750 microns x 3 p 80 of final grind in microns m ib provided by data from the standard bond ball work index test using the following equation morrell 2006 m 80 80 0295 1 80 80 18 18