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Ball mill is the key equipment for grinding after the crushing process, which is widely used in the manufacture industries, such as cement, silicate, new building material, refractory material, fertilizer, ferrous metal, nonferrous metal and glass ceramics and can be used for the dry and wet grinding for all kinds of ores and other grind-able materials.
The Bond ball mill work index is one of the most commonly used grindability tests in mining and is often referred to as the Bond work index The test is a lockedcycle test where ground product is removed from test cycles and replaced by fresh feed
The Bond’s BallMill Work Index is a measure of the resistance of the material to grinding in a ball mill This Index is widely used in the industry for comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill scaleup
The Rod Mill Work Index RWI is used for particle size determination in a size range from 25 mm down to 21 mm whereas Ball Mill Work Index BWI is used for the range from 21 mm down to 100 µm Adjustment of grinding parameters The operation display permits convenient selection and storage of parameters such as rotation counter rotation speed grinding time start and stop Product
Procedure for determination of ball Bond work index in the commercial operations 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
This data is all obtained from doing Bond BM Wi tests on SAG ground ore In Table 6 below it is seen that the Crushed Bond Ball Mill Wi test gives a lower result than when the ore is ground in a SAG mill For Tenke samples the average difference was 09 kWht higher for the SAGDesign Bond test
Bond rod mill work index results from Australian laboratories with smooth liners should not be used in the models The test is a lockedcycle test where ground product is removed from test cycles and replaced by fresh feed
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
Figure 1 Uniaxial compression test machine 3 STANDARD BOND TESTS The Bonds standard ball mill is used to determine the work index value of differ ent samples The Bond work index is defined as the kilowatthours per short ton required to break from infinite size to a
The Bond ball mill work index test is thought to be additive because of its units of energy nevertheless experimental blending results show a nonadditive behavior The SPIR value is known not to be an additive parameter however errors introduced by block kriging are not thought to be significant
This 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
Bond Ball Mill Work Index Determination The average useful work input to the standard ball mill is 65 joulesRev with 115 joulesRev to the rod mill The crack energy Ce of the sample tested is found by dividing joulesRev by CmRev The standard work index can then be found by transposing Eq 16 and solving for Wi100
Work indices for the AGSAG mill and ball mill can be reorganised as 7 and 8 where B’Wio and A’Wio are the corrected operating work indices and WAGSAG WBM are the respective power draw of AGSAG and ball mills Note that the ball mill operating work index is applied only on the portion that needs the additional grinding Q2
Are the Bond Work Index Wi values Bond 1952 divided into a low energy crushing work index Wi C for coarse rocks 7550 mm a rod mill work index Wi RM for intermediate sized particles 253 mm and a ball mill work index Wi BM for small particles 3 mm Ammtec 2000 Laboratory
Insmart Bond’s BallMill Work Index is a measure of the resistance of the material to grinding in a ball mill This Index is widely used in the industry for comparing the resistance of different materials to ball milling for estimating the energy required for grinding and for ball mill scaleup
This 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
The standard Bond Ball Mill Work Index test procedure is firstly to stage crush the feed to minus 335mm and size a representative sample The test then involves a series of batch grinds in a standard Bond mill A Bond mill is 0305m by 0305m with rounded corners a smooth lining and runs at 70rpm Learn More
Bond Ball Mill Work Index BWi The bond ball mill work index bwi test is used to determine the net power requirements to grind a specific ore reducing its feed size 80 passing f80 to a product size 80 passing p80he normal finishing size of this closed circuit dry grindability test is typically 150 microns but other sizes can be
Work Index Ball Mill alluding to the grind ability list of Metals is utilized to demonstrate the granulating trouble of the material It is measured by a rule that to compute the work file ball plant in light of yield of every unrest of the factory after the material is ground to an adjusted state by the predetermined plan
Bond work index value of these components mixtures is greater than the Bond work index of harder components clinker Oner 2000 have conducted a research of clinker and blast furnace slag mixture Bond Work Index in different mass proportions He found out that these values are always lower than the Bond Index obtained
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 3327 mm
Using a novel ring mill a laboratory ball mill a labora tory rod mill and the semi continuous process using the same rod mill as described below In all cases the min eral sample is crushed and screened to pass a predeter mined size 35 or 4 mm The feed sample undergoes a wet screen analysis and a certain quantity usually 05
Bond ball mill work index testwork providers bond ball mill work index testwork providers 11 Jun 2012 Gulin supply Mining and construction equipment for mineral handling The crushing screening washing
Ball mill A typical type of fine grinder is the ball mill A slightly inclined or horizontal rotating cylinder is partially filled with balls usually stone or metal which grind material to the necessary fineness by friction and impact with the tumbling balls Ball mills normally operate with an approximate ball charge of 30
Mill 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
For design and development of multiple type of mills One of them is Bond Work Index having association with ball mill and second one is Hardgrove Index which shows strong association with Vertical Spindle Mill The best experiment is standard Bond Work Index BWI which associates the energy or intensity of energy required to
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 2 MATERIAL AND METHOD As a base for this study four natural amorphous silica samples were used for test
From 14 to 34 kWht and Bond ball mill work index values vary from 6 to 24 kWt for the same ores Project design tonnages varied from 200 to 150000 td SAG mill sizes varied from 10 ft to 40 ft diameter in multiple SAG mills and ball mill sizes varied from 7 ft to 27 ft in diameter
Bond Method For Ball Mill Work Index Test Bond developed a standard laboratory test for the determination of the work index for ball and rod mills in 1952 and modified it in 1961 The standard Bond ball mill grindability test is a closed circuit dry grinding test with a 250 circulating load The standard procedural outline of the test is stated in Bond 1961 The work index for a
Oct 18 2018 · Bond Work Index BWI Test Celtest have the capability to carry out the Bond Work Index BWI Test in accordance with EPRI Report CS3612 FGD Chemistry and Analytical Method Handbook Volume 2 The BWI is used to estimate the required mill power per ton of product Specific Energy
2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP Ballmill scale up Bond’s LawData zBond work index w i zFeed D f and product d size both 80 cumulative passing Result The specific grinding energy w Mill power draw P wT where T the mill capacity Mill dimensions from Tables or charts