Metallurgical ContentBasic EquationsSize Distribution and Exposure RatioEquations for Work Index VariationsWork Index and Crack Energy What is the Bond Work Index Formula-Equation In case you had forgotten, here is a classic: You can read all the details of this now “Biblical” grinding power requirement calculation formula in Fred Bond’s original . You can also review the step-by

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 pick

The ball mill index oratory test is conducted by grinding an ore sample prepared to 100% passing 3.36 mm (6 mesh) to product size in the range of 45-150 µm (325-100 mesh), thus determining the ball mill index (Wi B or BWi). The index calculations across a narrow size range are conducted using the appropriate oratory index determination for the material size of

The Bond Equation 5 Circuit Bond Work Index Efficiency (Rowland, 1973) WIeff = Circuit WI OC * Ore WI *Corrected for non-standard conditions This value represents the fraction or percentage of the Bond predicted energy (for that ore) that the plant is using. <1 = good >1 = poor The inverse of this ratio can also be used. 6

[2], the operating index (Wio) of an existing grinding circuit can be calculated, given known mill power draw, throughput, feed and product size distributions. kWh/t = Power applied per ton of feed to the grinding unit Wi = The standard Bond index of the ore P 80 = The 80% cumulative passing size of the product in microns F 80

WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy requirement at the drive pinions. 3.KEYWORDS Work Index, Work Index Efficiency, Bond Work Index testing 4.INTRODUCTION AND BACKGROUND The Bond method allows for quantification and com-parison of relative energy efficiencies of most

The grinding-product 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 P= P k K 2.

01/01/2017· The Bond index, Wi, is defined in a Bond ball mill on the samples of standard size − 3.327 + 0 mm. In pract, it is possible to find materials of non-standard size that are finer than 3

Ball Mill DesignPower Calculation,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 specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum ‘chunk size’ product size as P80 and maximum and finally the type of

In grinding, operating Efficiency compares the operating index of a comminution machine to the Bond 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. Energy as consumed in comminution machines and the required energy as determined, from bench scale

Ball Mill DesignPower Calculation,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 specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum ‘chunk size’ product size as P80 and maximum

* Bond F. C., “Crushing Tests by Pressure and Impact”, Trans AIME, Vol 169, 1947, pp 58-66. 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.

Bond Grinding Circuit Efficiency ceecthefuture org. 2018220Mill 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

ball mill calculation xls. CALCULATION OF BALL MILL GRINDING EFFICIENCY Page 1 of 1 . PLEASE EXPALIN IN A N EXCEL SHEET TO CALCUALTE THE SAME. anyone give me, step step by procedure on how to out on cement ball mills to Performance calculator for ball mills based on dry milling method. Mill Throughput Capacity. 1, About the SAGDesign_Mill Sizing Spreadsheet . Ball Mill

The aim of this study was to develop a new method for assessing the Bond index in a ball mill (BBWI), which is based on a first order kinetics present in the Bond ball mill for grinding mineral raw materials (Austin et al., 1981; Ahmadi and Shahsavari, 2009). Theoretical basis of quick procedure Grinding of various mineral raw materials in the Bond ball mill occurs

Calculation Of Energy Required For Grinding In A Ball Mill. Jan 01 1989 calculation of energy required for grinding in a ball mill int j miner process 25 4146 the bond index wi 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

The index . W. i. was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. The calculation is based on the size-energy relationship . 1,2 21. 11. nn. eC. x,which for . n = 0.5, x. 1 = ∞ and . x. 2 = 100, by definition gives . e ∞,100 = W. i. and consequently . C = 10. W. i. In theory, for a given

Bond’s approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized oratory test. The full suite of Bond comminution tests provide the Ball Mill Work Index (BWi), the Rod Mill Work Index (RWi), the Crusher Work Index (CWi) and the Abrasion Index (Ai). Over the years, it has been determined that

The Bond's standard ball mill is used to determine the index value of differ ent samples. The Bond 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

Bond Work Index efficiency has been widely used by industry, but until now without concise standard methods, or a formal guideline, for doing so. The Bond Efficiency SubCommittee of the Industrial Comminution Efficiency group of GMSG has produced such a guideline, which follows. It covers the methods and provides examples of how to calculate the Bond Work Index Efficiency

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