Bond 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
Chat OnlineUltrafine Mill is a kind of high efficiency grinding machine, which has up to 3250 meshes fineness, 30-800kg/h production capacity and high regulatory.
Raymond mill is suitable for medium and small sized mines, chemical plants, smelting plants, ore dressing plants, pharmaceutical companies, refractory material factory, cement plant and other powder making industry.
Cement mill is also called cement ball mill, which is mainly used for grinding cement clinker in the cement production process. It is one of the important cement equipment.
Every day, many fruit processing plants have generated large amount of coconut shell waste, which not only occupies a lot of space, but also results in the waste of resources.
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 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 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
Variability samples must be tested for the relevant metallurgical parameters Ball 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
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
are 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
Procedure for determination of ball Bond work index in the commercial operations While the BWI has been used extensively on brittle materials 1028293031 32 3334 limited testing using modified forms of the theory of biomass has been conducted in planetary ball mills 11 and hammer mills 35
Figure 1 Uniaxial compression test machine 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
the different faces of quarry Bond work index of limestone Face4A results less than 20kwht remaining 6 samples are marked as hard rock because of high energy consumption and low grindability rate Index Terms Ball mill Bond Work Index Comminution Grindability Liberation Limestone Ultra
Procedure for determination of ball Bond work index in the commercial operations While the BWI has been used extensively on brittle materials 1028293031 32 3334 limited testing using modified forms of the theory of biomass has been conducted in planetary ball mills 11 and hammer mills 35
zThe ballmill dimensions internal mill diameter D and length L for a given LD ratio for feed size D f and product size d mm for a known Bond work index w i kWhshort ton and for desirable capacity T short tonh can be calculated from D d T D D L f 35 0106 0193 0962 1038 09180 1 − ×
It is measured by a rule that to compute the work file ball plant in light of yield of every unrest of the factory after the material is ground to an adjusted state by the predetermined plan This Work Index Ball Mill additionally called plant for measuring bond work record is a
are 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
Ball mill was employed to conduct the grinding test of seven different samples Among all seven samples collected from the different faces of quarry Bond work index of limestone Face4A results less than 20kwht remaining 6 samples are marked as hard
Charge Height Generally For overflow ball mills the charge should not exceed 45 of the mill volume For grate discharge mills the charge should occupy about 50 of the mill volume Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge He
The work index W i was defined by F Bond as the specific energy kWhton required to reduce a particulate Ball Mill Batch Process The mill dimensions D × L are 0204 × 0158 m and it is loaded with 65 kg steel balls between 25 and 32 mm in diameter The mill rotates on rolls and its frequency is
Bond 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
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
Reference mineral Granite of known weight and work index 1514 Kwh tone was ground for 30 minutes at a particular speed and power consumed was determined from the power rating of the ball mill An identical weight of Wasagu Manganese ore whose work index was to be determined was ground in the same ball mill under same condition as
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 The energy
W is the work index measured in a laboratory ball mill kilowatthours per metric or short ton P 80 is the mill circuit product size in micrometers F 80 is the mill circuit feed size in micrometers Rod mill A rotating drum causes friction and attrition between steel rods and ore particles
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
Insmart 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
grindability is Bond’s 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
Rod 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
According 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
work index covering grinding of fine particles is labelled M ib Morrell 2008 M ia values are provided as a standard output from a SMC Test Morrell 2004a whilst M ib values can be determined using the data generated by a conventional Bond ball mill work index test M ib is NOT the Bond ball work index M ic and M ih values are also
Bond Work Index Procedure and Method Mineral 20190626 This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond
22 Ball Mill Batch Process The mill dimensions D × L are 0204 × 0158 m and it is loaded with 65 kg steel balls between 25 and 32 mm in diameter The mill rotates on rolls and its frequency is set to 70 RPM 1667 Hertz corresponding to 85 of the critical frequency The mill power is P 162 Watts
Laporan Akhir Projek Penyelidikan Jangka Pendek Study of the The clinker samples collected also undergone standard Bond grindability test The objective of the Bond ball mill test is to determine the socalled standard work index carbonate found in
Oct 19 2017 · Bond formula for the grinding balls size calculation October 19 2017 · Archive · 0 The enterprises consumers grinding media have a question about right choise the grinding ball size diameter for the mill in order to achieve the required grinding quality
grindability on the Bond ball mill grindability G hg and work index W are investigated based on four the Bond ball mill grindability Ght and work index Table
• Bond Test WI’s kWht Crushing160 Rod Mill 145 Ball Mill 138 • Bond Standard Circuit Work Index W1 160 x 10 SQRT 16000 – 10 SQRT 165000 09 kWht
The ball ﬁ mill work index is con rmed at 16 kWht The operating ﬁ work index though is in the range of 21 kWht to 25 kWht showing high inefﬁ ciency This raises the point that in some cases the Bond EF4 oversize factor calculation is not suf cient to compensate ﬁ for the milling inef ciencies that arise
250 400 and 550 and work indexes W were calculated 21 The test of standard ball mill Bond grindability The standard Bond grindability test is a closedcycle dry grinding in a standard ball mill 305x305 cm and screening process which is carried out until steady state condition is obtained
Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80 passing ¼ inch 6350 microns
Copyright© 2018 machinery.All rights reserved