The Bond work index so crucial to comminution planning

The Bond Work Index approach is the standard method of selecting ball mills to grind from about 3 mm to 25 µm provided that correction factors are used if necessary The power prediction is fairly accurate for devices that produce a product with a size distribution parallel to that of the feed It does not work well for devices such as the AG

PDF Alternative Approaches for Determination of Bond Work Index

The Bond work index BWI is a well known method used when selecting comminution equipment to evaluate the grinding efficiency and to calculate the required grinding power Although considered an

Index Linked Bond Definition How They Work

In general Bond s work index is used to determine the grinding efficiency and also to calculate the power requirement The process is very time consuming and it requires skilled labor and specialized mill A systematic investigation was carried out to predict Bond s work index using simple field measurable properties of rocks

A new methodology to obtain a corrected Bond ball mill work index

The presented procedure can be used to predict the corrected Bond work index for standard size where all the parameters of the Bond ball mill grindability equation for the coarse or fine sample are known The presented procedure represents a practical contribution that will help industry operators in designing a new plant or optimizing an

Berbagi ilmu metalurgi mengenal apa itu bond work index

Mudahnya operation work index ini mirip dengan bond work index tetapi memiliki subjek yang berbeda Satuannya pun sama yaitu kwh/ton bijih yang diproses Berbeda dengan BWI Work index suatu pabrik pengolahan diperoleh dari hasil aktual pengukuran di

A new approach to the calculation of bond work index

The Bond work index BWI is a well known method used when selecting comminution equipment to evaluate the grinding efficiency and to calculate the required grinding power Although considered an industry standard Bond did not fully define that procedure and therefore significant discrepancies in test results can sometimes be obtained due to

Bond´s work index estimation using non standard ball

Bond s Work Index 𝑊 is a property of minerals which relates the resistance that these oppose to break by the effect of the specific energy applied to the rupture starting from an

Investigation into the applicability of Bond Work Index BWI

The Hardgrove Grindability Index HGI test is based on Rittinger s theory that the work done in grinding is proportional to the new surface produced [17] [18] The index varies from 20 to 110 with a lower HGI indicating a coal is harder to grind and more energy will be required to reach the required degree of fineness

Impact Work Index Procedure 911Metallurgist

Use this in complement to the Bond Crushing Work Index This is or was used by Sandvik to acquire the Impact AKA Crushing Work Index for sizing crushers 911 Metallurgist is a trusted resource for practical insights solutions and support in mineral processing engineering helping industry professionals succeed with proven expertise Impact

Variability Study of Bond Work Index and Grindability

The Bond work index most commonly referred to is the BBM work index This value is obtained in a 12 × 12 laboratory mill running at 70 rpm with rounded inner edges and without lifters The grinding charge is comprised of a distribution of

Work Index SpringerLink

The self grinding work index is an extension of the concept of Bond work index It generally refers to the work index calculated by using Bond s fracture theory on the principle of ore crushing energy consumption according to the W F and P data of a small or semi industrial or industrial self grinding test In this kind of test McPherson small self grinding closed circuit

PDF COMPARISON OF THE DIFFERENT WAYS

Bond Work Index in different mass propor tions He found out that these values are always lower than the Bond Index obtained as the mean calculated Bond work index value of mixture components by their mass portion Ipek et al 2005 have carried out the Bond work index measurements by the

Bond Work Index Report Matrix House 911 Metallurgist

the last 3 runs on the Bond Mill The grindability is defined as the ease at which a mineral particle is reduced to a predetermined size and used to calculate the Work Index The feed and final undersize particle size analysis as well as the grindability test data sheet are found in the appendix Bond Work Index Report

Index Linked Bond Definition How They Work

In general Bond s work index is used to determine the grinding efficiency and also to calculate the power requirement The process is very time consuming and it requires skilled labor and specialized mill A systematic investigation was carried out to predict Bond s work index using simple field measurable properties of rocks

Estimation methodology for Bond ball mill work index

In this study for the Bond work index determination variations in parameters such as mass kg and feed particle size distribution F 80 to the mill grinding time due to the variation in the number of revolutions required by the method and chemical composition due to the selection of four different minerals can be observed

Testwork Bond ball mill work index

where W is the energy input work in kilowatt hours per metric ton; Wi the work index or Bond work index in kil owatt hours per metric ton; and P80 and F80 are the 80% product and feed passing sizes in micrometers respectively W = 10⋅W i ⋅ 1 1 √ P80 − 1 √ F80 Caibin Wu ; 18779320782 Jiaqi Tong

Bond´s work index estimation using non standard ball mills

Bond Work Index estimation using non standard dimensions mills This was done by proposing grinding tests using four types of ores and four mills of different dimensions including the standard Bond ball mill BBM For all tests it was kept constant a critical speed 91% and b mill charge by volume % varying the amount of fresh

Estimation of the Specific Energy Requirement for Size Reduction

Design engineers generally use Bond Work Index and Bond energy equation to estimate specific energy requirements for ball milling operations Morrell has proposed different equations for the Work Index and specific energy which are claimed to have a wider range of application In this paper an attempt has been made to provide a comparison of these two

Determination of work index in a common laboratory

Bond work index determination Tests were carried out at a product size of 200 µm repeating each one three times The final results of the test are shown in Table 2 with the work

분쇄공정 Bond work index

분쇄 공정을 설계하는 과정에서 분쇄에 소요되는 동력을 추산하는 것은 상당히 종요합니다 분쇄 장비의 운전관리 등을 사전 평가하는데 이용 이 전에 소개한 3가지의 이론들 Rittinger Kick Bond 이 이를 추산하는데 사용됩니다 이 중 볼밀과 로드밀에는 본드 분쇄일지수 Bond work index 가 많이

GMSG GUIDELINE DETERMINING THE BOND

Bond Work Index relationship has been noted to apply down to approximately 70 m and perhaps no finerµ without making qualifications Calculations First calculate the actual Operating Work Index WloACT of the grinding circuit • Estimate the 80% passing sizes of circuit feed and product

Determination of work index in a common laboratory mill

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