A Bond ball mill work index is then performed on the mill product for the design of SAGball mill circuits. This is important because it was found that there was a 1– kWh/t higher ball mill work index if the – mm ball mill test feed size is obtained by SAG mill .

Ball mill. Ball mills normally operate with an approximate ball charge of 30%. Ball mills are characterized by their smaller (comparatively) diameter and longer length, and often have a length to times the diameter. The feed is at one end of the cylinder and the discharge is at the other.

work index curve for ball mill Bond Work Index FormulaEquation You can also review the stepbystep Bond Work Index Test ... distribution line to curve in the ... work input to the standard ball mill .

Index Test, The Bond Rod Mill Work Index Test and the Bond Ball Mill Work Index test. ... power and Bond's equations an autogenous work index (AWi) for the sample was calculated. This .... crusher in the SAG/AG circuit is a technical and reasonably welldefined decision. .....

The test of standard ball mill Bond grindability The standard Bond grindability test is a closedcycle dry grinding in a standard ball mill ( cm) and screening process, which is carried out until steady state condition is obtained. This test was described as .

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.

shortcomings, the test was changed to a locked cycle technique as described below. LOCKED CYCLE TESTS . The preferred test procedure is a locked cycle 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 ...

(2006). This test now includes a Bond Ball mill work index test. The Macpherson test is still being offered by some testing facilities. This dry test requires at least 180 kg of material. Morrell (2004) formulated an AG/SAG specifi c energy generator based on a drop weight index Value (DWi).

As with our standard range of ball and rod mills, the Essa® Bond Index Ball Mill and Bond Index Rod Mill are supplied standard with a barrel and rotating yoke assembly and the electric motor drive mounted on a stand alone bench, funnel and screen.

Bond Ball Mill Work Index Hardness Jktech. bond ball mill index test jktech aardappelpuree. bond ball mill work index hardness jktech kahotels. design of the kubaka grindng circuit using spi and bond Starkey . accurate way to measure ore hardness in a SAG .

Sep 08, 2013· 1.)energy index in the laboratory test and by using the "C" factor we can establised the Bond work index which is appalicable for the inductrial mill. 2.) I experience in many inductries people use different type of lab ball mill for testing (totally different with the details what you give in attachement link). what is the the impact of this ...

The standard equation used by them for the ball mill work index (Bond work index) ... Vertical Roller Mill MSB Coarse Powder Mill Chat Now; crusher operating work index calculation Gold Ore Crusher Home>Crusher Solution>Vertical roller mill> Calculate . Operating work index has the same ... Ball Mill Bond Work Index For ...

In this thesis the common Bond ball mill grindability test is conducted on three different sample materials. The samples show good variability in terms of mineralogy and grindability. Along with the Bond test, the Mergan ball mill grindability test is also conducted on the same sample materials. The Mergan test is faster than the Bond test,

Apr 11, 2018· The Bond Ball Mill Work index test, first developed by Fred Bond in 1952, is the industry standard for sizing mills and measures the resistance of an ore to grinding. The Work Index can be used to determine the power required for closed circuit ball milling.

MINE 331 Bond Work Index ii MINE 331 Bond Work Index... Therefore, energy required is dependent upon product and feed sizes. It also states that the crushing efficiency is constant for mills with the same reduction ratio. Kick's is more suited to measure the energy required to crush coarser particles greater than 50 mm.

Il est appelé « Bond Ball Mill Work index » (BBMWi) en anglais. Cet indice énergétique ne doit pas être confondu avec les 2 autres indices de Bond: celui pour les concasseurs (BCWi) et celui pour les broyeurs à barres (BRMWi).

The work index of a particular material is determined in the laboratory by conducting the standard Bond grindability test. Bond developed separate tests for the rod mill and the ball mill. The simplified test method described in this paper, which is used at Anaconda Research Center to approximate the work index, is an alternative procedure to ...

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 ...

i is Bond Work Index, in kWh/t; P is square sieve opening passing 80 % of the product, in µm; and F is square sieve opening passing 80 % of the feed, in µm. According to the definition of Bond, the Work Index represents the energy which is required to grind one short ton of ore (1 sht = 907,18 kg) of unlimited large sizes ( F = f)

Geometallurgical comminution test (GCT) is a method simplified from standard bond method and it requires small amount of sample (220g) and less time than a standard procedure for measuring bond work index (Mwanga et al. 2015). GCT will be used for measurement of bond work index of .

commercial grinding conditions for the test in a m diameter SAG mill. In the 2009 database, SAG pinion energies (to grind from F80 152 mm to T80 mm) vary from to 34 kWh/t and Bond ball mill work index values vary from 6 to 24 kW/t for the same ores. Project design tonnages varied from 200 to 150,000 t/d, SAG mill sizes varied from 10 ft

It can be used at mesh sizes from 65 to 200 mesh (normally 100 mesh). The test requires calibration against the standard Bond Ball Mill Work Index test to estimate the Work Index. It is used to show the orebody hardness profile and to predict throughput in a ball mill circuit.

Bond Ball Mill Laboratory Scrubbing testwork: Batchlaboratoryscrubbingtestworkareconductedusinga scrubber having a diameter of 1 m. The variable speed unit is Bond Rod Mill Point load test: ThePointloadtestinghasbeenusedformany yearstodeterminerockstrengthingeotechnical studiestoclassifyoresindifferentdomains.

Jan 18, 2017 Fulltext (PDF) The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Determination of the energy consumption for ore grinding in a Bond ball mill ..

This grindability test is conducted in a Bond ball mill of φD/L= / m dimensions at the speed of 70 rpm. The mill is loaded with kg standard sized balls and 700 cm3 of grinded materials to under mm.