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Bond work index formulaequation mineral processing you can also review the stepbystep bond work index test procedure i posted here see thisuseful summarytable of bond work index by minerals for any circuit whether a crushing circuit a rod mill or a closed ball mill circuit the work index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to.
21 conclusions continued in the present work equations were also derived giving zthe ballmill power drawp as a function of its dimensions internal mill diameter d and length l zthe ballmill power drawp as a function of the feed d f mm and the product size d mm the bond work index w i kwhshort ton and the mill throughput t short tonh zthe ballmill dimensions d and l when
Ball mill power calculation calculation of energy required for grinding in a ball mill the grindingproduct size p in a bond ball mill which is given by the aperture size which passes 80 of the grinding product as a function of the aperture size of the test screen p k can be expressed by the formula
Ball mill specific energy calculator xls as a leading global manufacturer of crushing grinding and mining equipments we offer advanced reasonable solutions for any sizereduction requirements including quarry aggregate and different kinds of
Bond expressed mill capacity as a function of mill shaft power pm kw and the energy required for particle breakage equations for mill sizes less than 381meters in diameter and greater than 381meters were proposed for wet ball mills bond expressed power draw as a function of the total mass of media
Bond rod mill grindability test grinding solutions can carry out bond rod mill work index tests to determine the energy requirements for milling ore in a rod mill the test requires a minimum of 20kg of 125mm material closing screen sizes typically range from 475mm to 212 m abrasion index
Bond work index formulaequation mineral processing you can also review the stepbystep bond work index test procedure i posted here see thisuseful summarytable of bond work index by minerals for any circuit whether a crushing circuit a rod mill or a closed ball mill circuit the work index always means the equivalent amount of energy to reduce one ton of the ore from a very large size
Bond work index tests grinding solutions ltd bond rod mill grindability test grinding solutions can carry out bond rod mill work index tests to determine the energy requirements for milling ore in a rod mill the test requires a minimum of 20kg of 125mm material closing screen sizes typically
Calculation of energy required for grinding in a ball mill calculation of energy required for grinding in a ball mill found that the change of the mass passing a test screen g could be related to the aperture size p k of the screen by the formula gk p k the grindingproduct size p in a bond ball
Efficiency correction factors are applied with the bond equation the method is valid both for clinker grinding and for raw materials grinding this method only gives a rough and initial idea for sizing a cement ball mill to go ahead a deeper study is necessary with ball mills suppliers or a specialized engineering
Energy which proved to approach very well the values calculated with the help of the denver slide rule the proposed model combined with a model giving the ballmill power draw is used for the ballmill scale up comparisons with the bond procedure showed a good agreement for the prediction of the ball
Hello everyone i am dealing with the calculation of bond work index the flowsheet is attached i have calculated primary ball mill bond index but for the calculation of second ball mill bond index i got trouble in a bond energy equation where should i select tonnage and where should i
If the exponent n in equation 1 is the test work involved bond ball mill testing rod milling low replaced by the values of 2 1 and 15 and then intensity magnetic separation lims and batch ball milling down integrated the wellknown equations of to product sizes of around p8025
The bond equation 3 the equivalent energy needed to go from very large rock to 100 um ie a standard amount of size reduction the bond equation 4 2202014 3 ss ball mills rowland 1998 87 115 x ball mills rodball selbaie mcivor 1988 100 10 x
The bond work index w i as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding producttherefore in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when for a given size of grinding product the value of the work index w i
The grindingproduct size p in a bond ball mill which is given by the aperture size which passes 80 of the grinding product as a function of the aperture size of the test screen pk can be expressed by the formula p p k k 2 these functions for g and p enable us to calculate the value of wi for any other size of grinding product if we know the work index wi and aperture size of the screen
The total energy required to break the feed ore to a product size p80 stated by bond in his third theory of comminution is shown in equation 3 e 10 wi p 80
Though it was altered in succeeding years it has essentially remained unchanged since 1961 1to calculate the bond work index w i in a standard laboratory scale rodmill bond derived the following equationw i 62 p 023 i g 0625 i 10 ffiffi p p 10 ffiffi f p h i kw h sh t 1 where f is 80 passing size of original feed p is 80
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