an average work index of 15.5 kWh/t. A very broad range of results was received, characterising the ‘standard ore’ from medium to very hard. A disappointing result considering the reliance on this test globally for design and optimisation. An improved method using less mass compared to the Bond Ball Mill Work Index test.

• Impact resistance as measured by the JK parameter A*b ranged from a very hard 25 to a soft 118, although the majority were between 30 and 55. • 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.

Jul 30, 2020 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.

Bond Ball Mill Work Hardness Jktech. Bond ball mill index test jktech a bond ball mill work index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits 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.

A bond ball mill work index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits 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 335 mm as required for the bond ball mill work index test feed

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

JKTech Pty Ltd UQ Experimental Mine Site 40 Isles Road Indooroopilly QLD 4068 Brisbane, Australia P: +61 7 3365 5842 F: +61 7 3365 5900

Bond method for ball mill work index test 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 required

Dec 14, 2015 Here is the old Allis-Chalmers Bond Work Index Grindability Test Procedure. The standard feed is prepared by stage crushing to all passing a 6 mesh sieve, but finer feed can be used when necessary. It is screen analyzed and packed by shaking in a 1000-cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground dry at 250

A bond ball mill work index may also be used in the simulation and optimisation of existing mills and the associated grinding circuits 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 335 mm as required for the bond ball mill work index test feed

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

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

JKTech Pty Ltd UQ Experimental Mine Site 40 Isles Road Indooroopilly QLD 4068 Brisbane, Australia P: +61 7 3365 5842 F: +61 7 3365 5900

Bond method for ball mill work index test 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 required

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 various relevant efficiency factors applied. In

Dec 14, 2015 Here is the old Allis-Chalmers Bond Work Index Grindability Test Procedure. The standard feed is prepared by stage crushing to all passing a 6 mesh sieve, but finer feed can be used when necessary. It is screen analyzed and packed by shaking in a 1000-cc graduated cylinder, and the weight of 700 cc is placed in the mill and ground dry at 250

Monzonite Bond Ball mill work indices (Wi) averaged 17.1kWh/t, with a maximum variation of ±9%. The inferred average orebody Wi, based on laboratory grind times over a significant number of drill core samples, was 18.1kWh/t (standard deviation 1.03kWh/t). The pilot plant samples had Wi’s of 17.4kWh/t and 17.3kWh/t, respectively.

• the bond ball mill work indices determinations gave reasonably reproducible results, • significant variation was observed in the measurement of the bond rod mill work index on at least one sample tested, and • large variations in abrasion index and crushing work index were due to variations in the test method across the laboratories.

Jun 16, 2015 The test determines the Bond Impact Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the required open-side settings (jaw crushers and gyratory crushers) or closed-side settings (cone crushers) for a given product size.P80 = 25400 x Oss x (0.04Wi + 0.40)

Jul 15, 2013 The average useful work input to the standard ball mill is 65 joules/Rev. with 115 joules/Rev. to the rod mill. The crack energy Ce of the sample tested is found by dividing joules/Rev. by Cm/Rev. The standard work index can then be found by transposing Eq. (16) and solving for Wi100.

However, if the sample is to be prepared by cutting with a diamond saw (cut-core method) as little as 5kg is normally sufficient. Also remember that the products from the SMC Test® can be re-used for Bond ball work index testing, the SMC Test® being effectively used as a feed preparation step for the Bond ball work

A big majority of people is still using the old Bond equations without asking themselves: do 950 g/t or 1,100 g/t of steel consumption in the ball mills make sense? When we apply our experience from the last 20 years we see right away that steel consumption in the range of 1,000 g/t in a ball mill is not correct, and that is a fact.

determination of various Bond Work Indices, Uniaxial Compressive Strength, JKTech Drop also provides specialised bench scale test work services related to ball mills (Mintek and provides information for design of Autogenous mills.

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

JKTech Pty Ltd UQ Experimental Mine Site 40 Isles Road Indooroopilly QLD 4068 Brisbane, Australia P: +61 7 3365 5842 F: +61 7 3365 5900

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

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 various relevant efficiency factors applied. In

Monzonite Bond Ball mill work indices (Wi) averaged 17.1kWh/t, with a maximum variation of ±9%. The inferred average orebody Wi, based on laboratory grind times over a significant number of drill core samples, was 18.1kWh/t (standard deviation 1.03kWh/t). The pilot plant samples had Wi’s of 17.4kWh/t and 17.3kWh/t, respectively.

Jun 16, 2015 The test determines the Bond Impact Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the required open-side settings (jaw crushers and gyratory crushers) or closed-side settings (cone crushers) for a given product size.P80 = 25400 x Oss x (0.04Wi + 0.40)

• the bond ball mill work indices determinations gave reasonably reproducible results, • significant variation was observed in the measurement of the bond rod mill work index on at least one sample tested, and • large variations in abrasion index and crushing work index were due to variations in the test method across the laboratories.

However, if the sample is to be prepared by cutting with a diamond saw (cut-core method) as little as 5kg is normally sufficient. Also remember that the products from the SMC Test® can be re-used for Bond ball work index testing, the SMC Test® being effectively used as a feed preparation step for the Bond ball work

A big majority of people is still using the old Bond equations without asking themselves: do 950 g/t or 1,100 g/t of steel consumption in the ball mills make sense? When we apply our experience from the last 20 years we see right away that steel consumption in the range of 1,000 g/t in a ball mill is not correct, and that is a fact.

Jul 15, 2013 The average useful work input to the standard ball mill is 65 joules/Rev. with 115 joules/Rev. to the rod mill. The crack energy Ce of the sample tested is found by dividing joules/Rev. by Cm/Rev. The standard work index can then be found by transposing Eq. (16) and solving for Wi100.

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 characterization methods. It is expensive, labour-intensive, the equipment and procedures used are

Mill bond ball mill work index database jktech.bond ball mill grindability test christina.202053bond ball mill work hardness jktech.jktech laboratory laboratory servicesthe standard bond rod mill work index test procedure is firstly to stage crush the feed to pass 127 mm and sie a representative sample the test then involves a series of batch

bond ball mill work index database jktech Raymond bond ball mill work index database jktech. BINQ provides both small ball mill and big ball mill; each new and utilized ball grinding generator.

Bond Ball Mill Index Test JKTech. 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

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