### MODELING THE SPECIFIC GRINDING ENERGY AND BALL

2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP Ballmill scale up (Bond''s Law)Data: 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)

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1) The ore fed to a rod mill has a Bond Work Index of 18 kWht1. The p80 of feed to the mill is 22 mm (f) and the p80 of the product from the mill is 0.140 mm (p). Calculate the work (in kW/tonne) required to grind the ore to the product size. 2)A ball mill with an internal diameter of 2,600 mm is operated at 75% of the critical speed.

Get price### AMIT 135: Lesson 8 Rod Mills – Mining Mill Operator Training

Rod Mill Power Draft. Rod mill power is dependent on mill capacity and work index. Mill power increases with: Increasing rod charge Increasing mill speed Increasing mill length. Rowland and Kjos (1980) provided an expression to quantify power draw at the pinion shaft per unit mass of rods: P↓M / M↓R = 1.752 D↑0.33 (6.3 – 5.4J↓R) Φ

Get price### Bond Work Index an overview ScienceDirect Topics

The Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes. He produced a correlation between the mass of test screen undersize per revolution, G, and

Get price### SAG Mill Testing Test Procedures to Characterize Ore

SAG Mill Testing Test Procedures to Characterize Ore. carried out with the Bond ball mill and rod mill grindability tests As discussed earlier in this paper it is important in this case to match the reduction size of the test to that desired from the industrial mill As such primary ball mills should be designed with the rod mill work index and singlestage ball mills

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(PDF) Rapid determination of Bond rodmill work index by modeling,This test was originally devel tion method of the Bond rodmill work index. The jaw crusher (JC2000, 200 130 mm jaw crusher, Labtech Essa Pty Ltd., with a wave type liner and a revo RþU ¼M ।Þ lution counter that runs at 46 rpm.

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Ball Mill Design/Power 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

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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.

Get price### MultiCompartment Rod/Ball Mill Evaluation on Bauxite

Rod mills generate small amounts of fines, as fine particles typically accumulate in the space between rods without enduring comminution [2]. Effective grinding of this material occurs in the ball mill compartment, generating finer fragmentation. The Bond Rod Mill Work Index (BRMWI) test was only possible for Blend 5 (Table 2) due to excessive

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Bond Work Index Ball Mill. We are a largescale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment. And they are mainly used to crush coarse minerals like gold and copper ore, metals like steel and

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Bond''s approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. 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

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Determining the Bond work indexes of a sample involves tests using laboratory scale grinding circuits. A unit weight is determined by achieving maximum packing of the prepared ore sample the unit weight is then fed into the circuit, with undersized product being replaced by

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LAB/PILOT PLANT EQUIPMENT • LAB/PILOT PLANT EQUIPMENT MILLS. Bond Work Index Rod Mill. The Titan Bond Work Index Rod Mill is onepiece cast construction with integral wave liners of a form described by Bond.

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bond ball mill 945233 A Method of C alculating Autogenous/ SemiAutogenous . using Bond rod mill work index (RMWI), and Bond ball mill work index (BMWI). However, the author has developed a relationship between the Bond third theory SE values and the AG/SAG SE values to enable the additional power required for AG/SAG milling to be determined.

Get price### Comparison of UCS to Bond Work Indices

FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. These

Get price### Orway Mineral Consultants Canada Ltd. Mississauga, ON

Bond''s approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. 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

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Bond Work Index Ball Mill. We are a largescale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment. And they are mainly used to crush coarse minerals like gold and copper ore, metals like steel and

Get price### Relationships between comminution J energy and product

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 ball mill, Wi, is then calculated from the following

Get price### Geometallurgy Wikipedia

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. [18] The SPI(R) value is known not to be an additive parameter, however errors introduced by block kriging are not thought to be significant .

Get price### Geometallurgy Wikipedia

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. [18] The SPI(R) value is known not to be an additive parameter, however errors introduced by block kriging are not thought to be significant .

Get price### Simulating the Bond rod mill grindability test Request PDF

The Bond rod mill grindability test is a widely used tool to estimate the response of ores to rod milling. However, the mass of ore required to conduct the test, which can typically vary from

Get price### Solved: The Ore Fed To A Rod Mill Has A Bond Work Index Of

Question: The Ore Fed To A Rod Mill Has A Bond Work Index Of 17.5 KWht1. The P80 Of Feed To The Mill Is 4.25 Cm And The P80 Of The Product From The Mill Is 0.185mm. Calculate The Work Required To Grind The Ore To The Product Size As Well As The Reduction Ratio.

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(PDF) Rapid determination of Bond rodmill work index by modeling,This test was originally devel tion method of the Bond rodmill work index. The jaw crusher (JC2000, 200 130 mm jaw crusher, Labtech Essa Pty Ltd., with a wave type liner and a revo RþU ¼M ।Þ lution counter that runs at 46 rpm.

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bond work index for an ultrafine mill sbm crushers potch,Andesite Bond Ball Mill Work Index bond work index for an ultrafine mill,dyno mill operation manual,Bond Mill Work Index Definicion ten defects and remedies in grinding process,Work Index, ultrafine mill for graphite india,filter bags for limestone grinding plant stone crusher plant gandhinagar,weight of rotor of.Bonds

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Bond''s approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. 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

Get price### Testwork: Bond ball mill work index SAGMILLING.COM

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.

Get price### SAG Mill Testing Test Procedures to Characterize Ore

SAG Mill Testing Test Procedures to Characterize Ore. carried out with the Bond ball mill and rod mill grindability tests As discussed earlier in this paper it is important in this case to match the reduction size of the test to that desired from the industrial mill As such primary ball mills should be designed with the rod mill work index and singlestage ball mills

Get price### GeolabsGlobal South Africa Comminution

The Bond Rod Work Index Test determines the resistance of ore to grinding in a rod mill, expressed as a work index kilo Watt hour per ton (kWh/t). The work index is then used to calculate the specific energy requirements for sizing rod mills or determining their throughput for a target grind.

Get price### Mill (grinding) Wikipedia

W is the work index measured in a laboratory ball mill (kilowatthours per metric or short ton) P 80 is the mill circuit product size in micrometers F 80 is the mill circuit feed size in micrometers. Rod mill. A rotating drum causes friction and attrition between steel rods and ore particles.

Get price### Bond Work Index For Coal In Crusher

Bond work index for coal in crusher bond work index crusher residentialpainterscoza the bond lowenergy impact crushing work index more informally, the bond crushing work index is not as common as the bond ball mill work index, and it is a notoriously noisy test the test is a perspecimen test where individual specimens of prepared rock.

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(PDF) Rapid determination of Bond rodmill work index by modeling,This test was originally devel tion method of the Bond rodmill work index. The jaw crusher (JC2000, 200 130 mm jaw crusher, Labtech Essa Pty Ltd., with a wave type liner and a revo RþU ¼M ।Þ lution counter that runs at 46 rpm.

Get price### Bond Abrasion Index Test Machine YouTube

Mar 29, 2017 · The abrasion test is mainly used to assess hammer wear in an impact type crusher (e.g. a hammer mill), hence the much higher rotational speed, whereas the Bond abrasion test is

Get price### Bond Work Index For Coal In Crusher

Bond work index for coal in crusher bond work index crusher residentialpainterscoza the bond lowenergy impact crushing work index more informally, the bond crushing work index is not as common as the bond ball mill work index, and it is a notoriously noisy test the test is a perspecimen test where individual specimens of prepared rock.

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Determining the Bond work indexes of a sample involves tests using laboratory scale grinding circuits. A unit weight is determined by achieving maximum packing of the prepared ore sample the unit weight is then fed into the circuit, with undersized product being replaced by

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design of the kubaka grindng circuit using spi and bond Starkey Both plants were designed using SPI (SAG Power Index) and Bond (Ball Mill Work how to design rod and ball mills in an accurate, economical manner, the concept .. region of 30 by volume and turning at about 75% critical speed. when the cascading charge hits the shell at about 5 o''clock in a clockwise rotating mill.

Get price### Relationships between comminution J energy and product

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 ball mill, Wi, is then calculated from the following

Get price### Bond Work Index Procedure and Method

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 appliion methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge. Below describes in general terms the Bond Work Index Procedure used by a Professional Metallurgical Testing Laboratory. If you

Get price### typical sizes of industrial rod mill

typical sizes of industrial rod mill . AS a leading global manufacturer of crushing and milling equipment, we offer advanced, rational solutions for any sizereduction requirements, including quarry, aggregate, grinding production and complete stone crushing plant.

Get price### MultiCompartment Rod/Ball Mill Evaluation on Bauxite

Rod mills generate small amounts of fines, as fine particles typically accumulate in the space between rods without enduring comminution [2]. Effective grinding of this material occurs in the ball mill compartment, generating finer fragmentation. The Bond Rod Mill Work Index (BRMWI) test was only possible for Blend 5 (Table 2) due to excessive

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bond work index of a mill . bond work index ball mill design and safety factors. how to design rod and ball mills in an accurate, economical manner, the Index Test, The Bond Rod Mill Work Index Test and the Bond Ball Mill Work Index test. .. less fluctuation and the allowance is reduced to 5% or a safety factor of 1.05. Chat Online. Get price

Get price### Mill (grinding) Wikipedia

W is the work index measured in a laboratory ball mill (kilowatthours per metric or short ton) P 80 is the mill circuit product size in micrometers F 80 is the mill circuit feed size in micrometers. Rod mill. A rotating drum causes friction and attrition between steel rods and ore particles.

Get price### Rapid determination of Bond rodmill work index by

Generally, Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power. In the current research, a simple, fast and accurate procedure is introduced to find the rodmill work index based on the conventional Bond work index.

Get price### Comparison of UCS to Bond Work Indices

FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. These

Get price### Bond Index Ball Mill / Rod Mill BT 100 XL RETSCH

The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a waveshaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill. The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work

Get price### Bond Abrasion Index Test Machine YouTube

Mar 29, 2017 · The abrasion test is mainly used to assess hammer wear in an impact type crusher (e.g. a hammer mill), hence the much higher rotational speed, whereas the Bond abrasion test is used in

Get price### calculation of rod mill grinding capacity

Ball Mill Design/Power 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

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