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 test much achieve a

The bond ball mill work index bbwi test is carried out in a standardised ball mill with a predefined media and ore charge the work index calculated from the testing can be used in the design and analysis of ball mill circuits the test requires a minimum of 10kg of sample that has been stagecrushed to 100 passing size of 335 mm

The bond index conforming rod charge consists of 6 rods of 125 diameter and 21 length 2 rods of 175 diameter and 21 length 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 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

Test method for bond ball mill work inde bond ball mill grindability test the bond ball mill work index bbwi test is carried out in a standardised ball mill with a predefined media and ore charge the work index calculated from the testing can be used in the design and analysis of ball mill circuits the test requires a minimum of 10kg of sample that has been stagecrushed to 100

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 3327 mm

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 product size of 80 passing 100 m if the breakage

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

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 kwht higher ball mill work index if the mm ball mill test feed size is obtained by sag mill grindinga new approach to the calculation of work index and the22 ball mill batch

Ball mill instruction manual pdf ball mill diagram sheet pdf the software to view and print adobe acrobat pdf is available for free from the adobe website follow the provided icon link to download acrobat reader 39550 220440v 3 phase 60 cycle 39550x

The bond work index is a measure of ore resistance to crushing and grinding and is determined using the bond grindability test its value constitutes ore characteristic and is used for industrial

Ball mill wio bwio 86 circuit wio owio 146 bond ball mill work index bwi kwht 134 bond rod mill work index rwi kwht 181 table 1 example of agsag ball mill circuit wio calculations 1 2 abstract optimum use of power in grinding both in terms of grinding efficiency and use of installed capital can have a large effect on

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

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

The rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80 passing 127 mm inch the original test being developed in imperial units to a product size of approximately 1 mm in the original and still the standard 14 mesh see chapter 4 for definition of mesh thus determining the rod mill work index wi r or rwi the ball mill work index laboratory test is

Dec 07 2018 it is commonly known that one must run the bond ball mill work index test such you pick a closing mesh to give a p80 close to desired grind size 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 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 is an alternative procedure to the ball mill grindability test

Oct 15 2015 the bond work index bwi or wi is defined as the calculated specific energy kw ht applied in reducing material of infinite particle size to 80 passing 100 m the higher the value for wi the more energy is required to grind a material in a ball mill

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 21 mm whereas ball mill work index bwi is used for the range from 21 mm down to 100 m adjustment of grinding parameters

The rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80 passing 127 mm inch the original test being developed in imperial units to a product size of approximately 1 mm in the original and still the standard 14 mesh see chapter 4 for definition of mesh thus determining the rod mill work index wi r or rwi the ball mill work index laboratory test is

Dec 07 2018 it is commonly known that one must run the bond ball mill work index test such you pick a closing mesh to give a p80 close to desired grind size 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

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 21 mm whereas ball mill work index bwi is used for the range from 21 mm down to 100 m adjustment of grinding parameters

Wibm bond ball mill test work index kwht wic bond impact crushing test work index kwht wioact actual operating bond work index determined from measurements on the circuit kwht wirm bond rod mill test work index kwht wistd standard circuit bond work index expected or designed used for circuit design specific energy requirement at the drive pinions 3keywords work index work index efficiency bond work

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 is an alternative procedure to the ball mill grindability test

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