However, in this situation the ball mill has to supply this energy and it has a different (higher) work index than the crusher (ie the ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction) Hence from equation 7, to crush to the ball mill ,

Get PriceA ball mill is a type of grinder used to grind or blend materials for use in mineral dressing processes, paints, pyrotechnics, ceramics, and selective laser sinteringIt works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near the top of the shell A ball mill consists of a hollow cylindrical shell rotating about its axis T

Get Price127 for the rod mill and 067 for the ball mill The particle size distributions reported are shown in Figure 1 It follows that the No 1 rod mill/ball mill circuit was operating very efﬁ ciently when comparing the combined operating work indices for both mills with the rod mill and ball mill laboratory work indic

Get Pricecycle test akin to the Bond Ball mill work index determination The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement Without adequate piston ,

Get PriceIn ceramics, ball mills are used to grind down materials into very fine particl Materials such as clay and glaze components can be broken down in a ball mill by getting placed into rotating or rolling jars with porcelain balls inside them During milling, the porcelain ,

Get PriceKinetic grinding test approach to estimate the ball mill work index 345 Kinetic grinding Exactly 700 cm3 of passing 335 mm material from each sample was progressively grounded in periods of 033, 1, 2, 4, and 8 minut

Get PriceThis is because work index frequently changes as a function of the product size in comminution If target grind size during a project is changed, or if the test is run at the wrong product size, then it is necessarily to provide a correction The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis

Get PriceGrinding Circuit Modelling Documentation This documentation describes the operating and underlying mathematics of the SAGMILLINGCOM grinding circuit modelling program It is intended to be used by the model users who want to operate and understand the functioning of grinding models

Get PriceThe 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 ,

Get Pricepuritic ore, calculated Bond work index is higher with different circulating loads, the Bond work index is higher with lower circulating loads The purpose of this study to determine the effects of circulating load (CL) and test sieve size (P;) on the Bond ball mill grindability (Ght,) and work index (W,) with natural amorphous silica

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Get PriceThe Bond's standard ball mill is used to determine the work index value of differ ent sampl 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 work

Get PriceThe ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 336 mm (6 mesh) to product size in the range of 45-150 µm (325-100 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 ,

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Get PriceBond Rod Mill work index, Bond Ball Mill work index, Bond low-energy impact crushing work index[2] One of the most , clay minerals (illite, kaolinite, chlorite, montmorilonite), chalcopyrite ,

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Get PriceWiBM Bond Ball Mill Test Work Index (kWh/t) , 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 3KEYWORDS Work Index, Work Index Efficiency, Bond Work Index testing 4INTRODUCTION AND BACKGROUND

Get PriceThe 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 ,

Get PriceHere is a list presented in table form of Rod Mill Work Index as tested/presented by SME handbook of mineral processing, NL Weiss Editor, NY 1985

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Get PriceFor overflow ball mills, the charge should not exceed 45% of the mill volume For grate discharge mills, the charge should occupy about 50% of the mill volume Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, ie,

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Get Priceothers in Allis-Chalmers have developed a grinding test in a ball mill in a closed cycle until the establishment of stable recirculating load (Maxson et al, 1933) The Bond work index is a parameter which represents a measure of an ore resistance to grinding Numerically, the work index represents the energy (kWh/sht)

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