The Bond work index (W i ) is widely used in the mineral industry for comparing the resistance of different ores to ball milling and can be used to estimate the …
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., 2006 ).
Shahsavari, Procedure for determination of Bond ball work The grindability experiments was carried out on the four typical index in the commercial operations, Min. Eng. 22 (2009) 104–106. samples of copper, lead–zinc, manganese and iron ore in specified  L. Tavares, R. Carvalho, J. Guerrero, Simulating the Bond rod-mill grindability ...
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.
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. 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 ...
GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY OF . Bond Test WI's (kWh/t): Rod Mill: Ball Mill: 95 kWh/t8 9 kWh/t Bond Standard Circuit Work Index: Assume the rod mill Work Index of 95 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ
A quick method for bond work index approximate value determination 323 This method, by using mathematical algorithms, simulates the Bond test on the basis of the results from the first two milling cycles. Magdalinovic (1989) proposed a shortened method for determining the Bond work index, which includes two milling.
Reference mineral (Granite) of known weight and work index (15.14 Kwh /tone) was ground for 30 minutes at a particular speed and power consumed was determined from the power rating of the ball mill. An identical weight of Wasagu Manganese ore whose work index was to be determined was ground in the same ball mill under same condition as
Indirect work index determination in other lab mills [19–24]. ... perform the series of Bond ball mill grindability tests separately (see Section 2.2), but not enough to perform the series of Bond rod mill grindability tests separately for each sample ...
Bond ball mill work index determination the bond grindability test the bond work index and uncil for tion of the energy consumed by wet grinding in a ball mill of 8 ft 244 materials that are too fine for determination by the stan dard bond chat online bond ball mill work index database jktech.
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 operation for further size reduction (grinding). 2.3 Procedure for the Determination of Work Index Using Modified Bond's Method The modified Bond's method for determining work index of an ore involves the use of reference ore of known grindability. Experimental procedures were as follows: 1.
cycle test akin to the Bond Ball mill work . index determination. The first cycle starts with minus 6 mesh ore removed since it is believed that the fines content can fill most of the voids allowing little room for rock breakage and piston movement. Without adequate piston movement there is little measurable energy used
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., 2006 ).
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 …
Alsto Bond Index Ball Mill – Mineral Stats. Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index. This is empirical index determined by closed circuit grindability tests developed by F.C.Bond in the mid 1930's.
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.
Determination of the energy consumption for ore grinding in a Bond ball mill requires samples of standard size, because changes in the size of the samples cause the change of the Bond work index (Magdalinovic et al., 2012).
The ball mill work index laboratory test is conducted by grinding an ore sample prepared to passing 3.36 mm (6 mesh) to product size in the range of 45-150 µm (325-100 mesh), thus determining the ball mill work index ( WiB or BWi ).
The Bond work index determination according to the standard Bond's test is done on all these samples with compara-tive sieve size of 74, 105 and 150 microns. The Bond Work Index is calculated using the formula (Bond, 1961): (√ √) (1) where: W i – Bond work index (kWh/t); P c – test sieve mesh size (µm);
Bond Ball mill work index determination (1 reply) s. srinu1234. 4 years ago. srinu1234 4 years ago. Dear all, Have a good day! I am trying to determine ball mill work index for a very soft . If I follow bonds procedure to do experiment, not able to determine. The following is the data of ore sample. F80% = 2300mic.
The work index can either be measured in the laboratory (the Bond ball mill work index determination is a common example) or it can be calculated from the operating performance of a milling ...
Bond Test WI's (kWh/t): Rod Mill: Ball Mill: 9.5 kWh/t.8 9 kWh/t . Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ
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 application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge.
The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined 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 stage-crushed to passing size of <3.35 mm.
Bond ball mill work index C Wi Bond crusher work index D HPGR roll diameter (m) E sp net specific energy consumption (kWh/t) F HPGR hydraulic pressing force (kN) F 80 particle size at which 80% of particles pass in feed F SP 2HPGR specific pressing force (N/mm ) L HPGR roll length (m) ṁ or m-dot HPGR specific throughput constant (ts/hm3)
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 comminution plants designing. Determining the Bond work index value is quite complicated, timeconsuming and requires trained operating personnel and therefore is …
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.
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 index test.
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 Index (BWI) is used for the range from 2.1 mm down to 100 µm. Adjustment of grinding parameters: