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JK Bond Ball Mill Test Since its introduction in the 1960s the Bond Ball Mill Work Index BBMWi parameter has been extensively used in predicting ball mill power draw Use of Work Index Along with comminution circuit design the work index parameter is widely used in tracking mill performance Due to the age and lack of controls for the test

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Bond Ball Mill Work Indices All JKTech Power data adjusted The testwork was conducted with −25 4 mm and −8 4 mm kimberlitic ores of varying hardness.The Hicom mill s response was

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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 material

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The Bond ball mill work index ranged in value from 14.1 to 18.7 kWh/tonne The Mitchell Zone and Kerr samples had relatively consistent Bond ball mill work indices ranging from about 14 to 15 kWh/tonne On this basis these samples can be considered moderately hard The two Sulphurets samples had Bond ball mill work indices of 16.7 and 18.7

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a modified Bond ball mill procedure Mod Bond was developed by MinnovEX Technologies now SGS which requires 1.2kg of sample crushed at minus 3.35mm The 1.2kg charge is milled with the standard Bond ball mill for a set time A particle size analysis is performed on the feed and ground product and a modified work index is calculated using a

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In the standard A C closed circuit ball mill grindability test the work index is found from where Pi is the opening in microns of the sieve mesh tested and Gbp is the net grams of mesh undersize produced per revolution of the 12″ x 12″ test ball mill The closed circuit 80 passing size P averages P1/log 20 for all sizes larger than 150 mesh.

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SMC Data Processing The results from conducting the SMC Test are used to determine the drop weight index DWi which is a measure of the strength of the rock as well as the comminution indices Mia Mih and Mic In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of

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The Bond Work Test was run in duplicate on each mill for each material The Bond Work Indices from Dr Usman s material were calculated to be

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micrometers in size According to the Bond standard procedure the work index is determined by simulating a dry grinding in a closed circuit in the Bond ball mill to achieve 250 circulating load Bond 1949 1952 1961 The test is performed on a raw material approximately weighing 10 kg which coarseness is 100 3.327 mm.

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In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing AG and SAG mills Ball mills Rod mills Crushers High Pressure Grinding Rolls HPGR .

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Grindability as indicated by the bond ball mill work index BWi ranged from 10–35 kWh/t with the majority between 15 and 27 kWh/t No clear relationships in terms A b and/or BWi was identified with geological aspects logged from the drill core such as weathering lithology alteration alteration intensity veining or combinations of these.

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A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill s and the associated grinding circuit s Sample requirements A minimum of 8 kg of material crushed to nominally minus 10 mm is preferred JKTech would stage crush the sample to minus 3.35 mm as required for the Bond Ball Mill Work Index test feed.

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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.

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The Bond ball mill work index test has been used for ore hardness characterization for more than 80 years Nevertheless the test suffers from significant disadvantages when compared with other

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JKTech conducts regular quality control testing of the laboratories licensed to perform JK Drop Weight SMC and JK Bond Ball Mill Tests to ensure that results are all within acceptable statistical limits This means that clients can be confident that results are accurate whichever laboratory performs the testwork Also all results from these

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A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill s and the associated grinding circuit s Sample Requirements A minimum of 10 kg of material crushed to nominally minus 10 mm is preferred JKTech would stage crush the sample to minus 3.35 mm as required for the Bond Ball Mill Work Index test feed.

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the relative grindability of different ores in ball milling Bond 1961 and Rowland and Kjos 1980 To use the Bond ball mill work index to determine the ball mill specific energy required for a particular grinding task the Bond equation must be used and the

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particle size are calculated and the Bond ball work index is then calculated using the standard Bond ball work index formula 𝑊𝑖= 44.5 𝑃0.23 𝑔𝑏𝑝0.82 10 √𝑃80 10 √𝐹80 2 where W i represents the Bond ball work index F 80 and P 80 are the feed and product particle sizes

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The Bond ball mill rod mill and impact work indices provide industry recognised standards for the determination of ore hardness and competency The JKTech Dropweight test also provides a determination of competency and can be combined with the autoabrasion test to provide parameters for circuit modelling using JKSimmet.

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The Bond ball mill work index Wi BM or BWi conducted from a feed size of approximately 2 mm to a product size on the order of 100 µm The Bond rod mill work index Wi RM or RWi conducted from a feed size of approximately 10 mm to a product size on the order of 1 mm The Bond crushing impact work index Wi C CWi LEIT or IWi conducted

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ores processed in the Bond ball mill were compared wi th the energy predicted from the Bond theory Bond work index and third theory equation Daniel 2006 and 2007 and Shi e t al 2006 .

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standard Bond crushing and rod mill work indices abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed and Standard Autogenous Grinding Design SAGDesign Tests patented by Outokumpu See reference 8 below The comparison of these results gives context to how the various measurements relate to each

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The Bond Index conforming rod charge consists of 6 rods of 1.25 diameter and 21 length 2 rods of 1.75 diameter and 21 length The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave shaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.

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Bond ball mill work index test standard pdf 1 introduction 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 2006this index is widely used in the mineral industry for comparing the resistance of different materials to ball milling for estimating the energy

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The article presents the review studies and classification of the existing methods of the Bond Ball Mill Work Index determination The scope of the analysis embraces the methods of Aksani and Sönmez Todorović Berry and Bruce Horst and Bassarear Ahmadi Kapur Gharehgheshlagh Lewis Magdalinovich Karra Smith and Lee Armstrong as well JKTech and Aminpro approaches.

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