# how to calculate mill bond or work index #### Bond Work Index Formula-Equation

Basic EquationsSize Distribution and Exposure RatioEquations For Work Index VariationsWork Index and Crack EnergyThe basic work index equation is:W = 10 Wi/√P – 10 Wi/√F(1)where W is the work input required in kilowatt hours per short ton to grind from 80% passing F microns to 80% passing P microns, and Wi is the work index, or the grinding resistance parameter. It represents the energy input required in kilowatt hours to reduce a short ton from theoretSee more on 911metallurgist #### Bond Work Index Procedure and Method

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 <1/2″ 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 youget price #### Bond Work Index an overview ScienceDirect Topics

The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure 3.10), a question arises as to whether this practice will alter the ball mill work index (BW i) of the materialget price #### Bond Work Index (Energy equation) Grinding #### (PDF) A quick method for bond work index approximate value

Jan 01, 2017 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 get price #### 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 -12.5mm material. Closing screen sizes typically range from 4.75mm to 212µm. Abrasion Index Testget price #### Bond Index Ball Mill / Rod Mill BT 100 XL RETSCH

A clear definition of the required crushing capacities and the desired product quality can be precisely determined by using the Bond Index test methods. Using the Bond Index test procedures it is possible to calculate crushing / abrasion behavior of mineral samples. This knowledge is essential to define the required ball mill layout andget price #### QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

grinding cycles. The Bond Work Index is calculated using the formula: 𝑖=1,1 44,5 𝑃𝑐 0,23𝐺,82(10 √𝑃80 −10 √𝐹80) (1) where W i Bond work index (kWh/t) P c test sieve mesh size (µm) G weight of the test sieve fresh undersize per mill revolution (g/rev) F 80 sieve mesh size passing 80% of the feed beforeget price #### Bond Index Ball Mill / Rod Mill BT 100 XL RETSCH

A clear definition of the required crushing capacities and the desired product quality can be precisely determined by using the Bond Index test methods. Using the Bond Index test procedures it is possible to calculate crushing / abrasion behavior of mineral samples. This knowledge is essential to define the required ball mill layout andget price #### ball mill to determine the index bond 075 kw

bond ball mill index jktech.a bond ball mill index test bbmwi is a standard test for grinding mill it is necessary to first calculate the amount of power kw Get Price bond work index for crushing coal cwjoinerydoncaster.ukget price #### Application of Operating Work Indices in Autogenous

Bond Ball Mill Work Index, BWi, kWh/t 13.4 Bond Rod Mill Work Index, RWi, kWh/t 18.1 Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations   ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability.get price #### QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

grinding cycles. The Bond Work Index is calculated using the formula: 𝑖=1,1 44,5 𝑃𝑐 0,23𝐺,82(10 √𝑃80 −10 √𝐹80) (1) where W i Bond work index (kWh/t) P c test sieve mesh size (µm) G weight of the test sieve fresh undersize per mill revolution (g/rev) F 80 sieve mesh size passing 80% of the feed beforeget price #### 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 -12.5mm material. Closing screen sizes typically range from 4.75mm to 212µm. Abrasion Index Testget price #### How To Calculate Crusher Work Index

how to calculate crusher work index. calculate crusher work index hometbmuebleriasmx The Effects of Blasting on Crushing and Grinding, calculate crusher work index, One reason for using Bond's third theory is that work index Wi has been Table 1 shows the feed and product size, the calculated total energy input, and theWork Index Metcom ExpertiseIt starts with Bond's.get price #### Bond Work Index Report Matrix House 911metallurgist

The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to 100% passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.get price #### A Method of C alculating Autogenous/ Semi-Autogenous

rod mill work index has not been de ned as yet. The ball ﬁ mill work index is con rmed at 16 kWh/t. The operating ﬁ work index, though, is in the range of 21 kWh/t to 25 kWh/t showing high inefﬁ ciency. This raises the point that, in some cases, the Bond EF4 get price #### Bond Tests Mining SGS

Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied. The test is a closed-circuit dry grindability test performed in a standard rod mill.get price #### ball mill work index calculation xls

Calculate a Mill's Operating Work Index. Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond’s work you can estimate the energy used into your grinding circuit. This is the most accurate and informative method, but much of the data necessary for its application is not yet available.get price #### Procedure for determination of ball Bond work index in the

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 7–10 grinding cycles, which shows that the procedure is a lengthy and complex one and is therefore susceptible toget price #### CORRELATION BETWEEN BOND WORK INDEX AND

The Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated workget price #### Orway Mineral Consultants Canada Ltd. Mississauga, ON

Drop Weight Index (DWi) and the coarse ore grinding index (M ia). Test data from the Bond ball mill work index test is used to calculate the fine grinding index (M ib). The M ia and M ib indices are used to calculate specific energy for the coarse (W a) and fine (W b) components of the total grinding specific energy at the pinion (Wget price #### how to calculate energy efficiency grinding mill

How to Calculate Grinding Mill Operating Efficiency. In grinding, operating Efficiency compares the operating work index of a comminution machine to the Bond work index from bench scale crushing and grindability tests or/and pilot plant tests. Economic Efficiency is comparing the income from production to the planned income from production.get price #### How To Calculate Crusher Work Index, Jaw Crusher

Bond work index formulaequation see this useful summary table 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 siz work get price

[PDF] #### Bond Work Index Report Matrix House 911metallurgist

The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to 100% passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.get price #### Procedure for determination of ball Bond work index in the

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. get price #### how to calculate energy efficiency grinding mill

How to Calculate Grinding Mill Operating Efficiency. In grinding, operating Efficiency compares the operating work index of a comminution machine to the Bond work index from bench scale crushing get price #### grinding balls calculations bond Mining

Feb 05, 2013 ball mill work index calculation Grinding Mill China. ball mill working principle and calculation Grinding Mill cylinder partly filled with steel balls the feed rate and F80 to the Bond get price

4.7/5(2.9K)[PDF] #### A New Approach to the Calculation of Work Index and the

The mill power is = 22.5 Watts, calculated by (6). Fi- P nally the product is wet screened to find the size d80. 2.4. Rod Mill Semi Continuous Process The same mill is used for the semi continuous grinding tests which is similar to the Bond test but with the exist- ing mill of known power. After time the mill get price

[PDF] #### Orway Mineral Consultants Canada Ltd. Mississauga, ON

Drop Weight Index (DWi) and the coarse ore grinding index (M ia). Test data from the Bond ball mill work index test is used to calculate the fine grinding index (M ib). The M ia and M ib indices are used to calculate get price #### Calculation of energy required for grinding in a ball mill

Jan 01, 1989 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 product.Therefore, 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 get price #### ball mill work index calculation xls

Calculate a Mill's Operating Work Index. Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond’s work you can estimate the energy used into get price

[PDF] #### CORRELATION BETWEEN BOND WORK INDEX AND

The Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated workget price #### bond 039 s work index ball mill details specificat ME

Bond S Work Index Ball Mill macadamia-chefadomicile.fr. Bond Ball Mill Work Index Determination. 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 2006 this index get price #### bond ball mill index equation in wills

Bond Work Index Formula-Equation Basic EquationsSize Distribution and Exposure RatioEquations For Work Index VariationsWork Index and Crack Energy The basic index equation is: W = 10 Wi/√P 10 Wi/√F(1) where W is the input required in kilowatt hours per short ton to grind from 80% passing F microns to 80% passing P microns, and Wi is the indexget price #### Ball Mill Design/Power Calculation

Dec 12, 2016 The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, get price

[PDF] #### CALCULATION OF THE POWER DRAW OF DRY

of the Bond ball mill grindability test. For all model based methods, a reliable method to calculate mill power draw for a given mill is required for the calculation of power draw. Morrell (1996) proposed a mathematical model for autogenous, semi-autogenous and ball mills which is based on the motion of grinding charge inside the mill.get price