Processing capacity:238-424t/h
Feeding size:≤12mm
Appliable Materials: ore dressing of ferrous metal,non-ferrous metal,glass ceramics,copper mine,cement clinker,ceramics etc. All grindable materials, various metal ores, non-metallic ores, non-flammable and explosive materials
Jun 06 2015 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
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 mill
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
Table of bond work index by minerals this table of ball mill bond work index of minerals is a summary as tested on around the world sample you can find the
Dec 07 2018 the goal of this work is to create an equation to adjust a bond ball mill work index from one p 80 basis to another the proposed model consists of two components the variable coefficient that is determined from a specific work index determination and a fixed exponent determined by a calibration procedure
You need a twostage solution first stage opencircuit mill and then second stage closedcircuit mill first stage will be broken into two parts as well you use a bond rod mill work index for the coarse component of the ore 21 mm and the bond ball mill work index for the fine component 21 mm
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 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 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 required for grinding which
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 index bwi is used for the range from 21 mm down to 100 m adjustment of
Oct 15 2015 bond work index bwi amp hardgrove grindability index hgi tests for biomass amp coal bwi can predict the potential for mill choking of biomass in a tube and ball mill hgi is a poor method of predicting grindability of biomass in vertical spindle mills pellets should be composed of predensified particles close to the target size
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
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 bond ball mill work index test feed
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 mill
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
Table of bond work index by minerals this table of ball mill bond work index of minerals is a summary as tested on around the world sample you can find the
Dec 07 2018 the goal of this work is to create an equation to adjust a bond ball mill work index from one p 80 basis to another the proposed model consists of two components the variable coefficient that is determined from a specific work index determination and a fixed exponent determined by a calibration procedure
You need a twostage solution first stage opencircuit mill and then second stage closedcircuit mill first stage will be broken into two parts as well you use a bond rod mill work index for the coarse component of the ore 21 mm and the bond ball mill work index for the fine component 21 mm
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
How to calculate mill bond or work index 2015729grindability is bonds 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 follows302 1 10 80 10 80 441 g p f w i bg i u 4 in designing and optimizing a milling circuit using bond
The rod mill and the ball mill the simplified test method described in this paper is an alternative procedure to the ball mill grindability test the work index is computed using the following empirical equation revised by bond in 1960 where the sieve opening at which the test is made microns 358 2
Bonds work index ball mills insmart systems insmart bonds 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
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 bond ball mill work index test feed
Bond work index an overview sciencedirect topics 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
2 the bond work index refers to the measure of the materials hardness or resistance to crushing and grinding and is numerically expressed as the kilowatt hours per short ton required to reduce the material from theoretically infinite feed size to 80 passing 100 m 2 it is calculated using the equation below w i 445 p i 0
Therefore the work input is given by 10 10 w wi 7p7f1 where w the energy input to the mill kwht wi work index kwht p square sieve opening which 80 of the product passes microns f square sieve opening which 80 of the feed passes microns equation 1 is the mathematical statement of the third theory or the bond equation numerically the work index is the
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
It is a standard measure that brings all size reduction circuits onto a common basis for comparison it starts with bonds work index equation w is the work energy input per ton f80 is the 80 passing size of the circuit feed and p80 is the 80 passing size of the circuit product in microns for example a grinding circuit is processing 450 th of dry feed with a mill drawing 3150 kw at the pinion
Bond work index procedure and method 911 201566 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 more
Bond test wis kwht crushing160 rod mill 145 ball mill 138 bond standard circuit work index kwht w total 09 34 80 123 kwht 141 kwht note 141 kwht is also the combined crrodball test wi of the ore this is also the expected operating wl of the standard circuit according to bond wistd lab wicomb 141 kwht
bond test wis 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 bond ball mill grindability test is run in a laboratory until a circulating load of 250 is developed it provides the bond ball mill work index which expresses the resistance of material to ball milling this happens after 710 grinding cycles which shows that the procedure is a lengthy and complex one and is therefore susceptible to procedural errors
May 01 2021 the bond grindability test is performed in a standard bond ball mill dimensions dxl305x305 mm and a speed revolution of 70 min 1 the mill is filled with balls with a diameter of 155 to 306 mm and has a total weight of 20125 kg this test uses dry grinding in a closed cycle until a stable circulating load of 250 is established
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
Dec 04 2020 work index can change as a function of the product size of a bond ball mill grindability test which is controlled by the closing mesh size the test operator has
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
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 index bwi is used for the range from 21 mm down to 100 m adjustment of
The bond work index is a measure of ore resistance to crushing and grinding and is determined using the bond grindability test its value constitutes ore characteristic and is used for industrial
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
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
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 rock because of
Oct 24 2018 the work index is a fitted coefficient to bonds equation given in the picture above the work index can either be measured in the laboratory the bond ball mill work index determination is a
Energy adjustment from 17 mm to the mill transfer size t 80 using bonds law starkey amp larbi 2012 the bond equation is used to calculate ball mill specific energy from t 80 to the final product p 80 size the total circuit specific energy is the sum of the sag mill and ball mill specific energies w sag rms16000ms4473 4 w t k ak bw
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
Wibm bond ball mill test work index kwht wic bond impact crushing test work index kwht wioact actual operating bond work index determined from measurements on the circuit kwht wirm bond rod mill test work index kwht wistd standard circuit bond work index expected or designed used for circuit design specific energy requirement at the drive pinions 3keywords work index
The work index obtained following the standard bond grindability test described above predicts the energy requirement for a 244 meter 8ft inside liners diameter prototype ball mill under the following conditions 1 wet closed circuit grinding 2
Ball mill bond work index wib 121 kwhst rod mill bond work index wir 105 kwhst impact bond impact index wii 79 kwhst sag power mei online bond work index an abreviated test that did not reach steady state as a bond work index does would only be mill sizing etc
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