The reason for this variation in ball mill work index is because the ore at Mt. Milligan has an intrinsic exponent of –0.45 in the 100 µm to 200 µm size range, not the –0.50 exponent empirically measured by F. Bond. The work index increase between 100 µm and 76 µm is due to a porphyritic grain size that causes a spike in energy

Comparison of UCS to Bond Work Indices . are the Bond Work Index Wi values Bond 1952 divided into a low energy crushing work index Wi C for coarse rocks 75 50 mm a rod mill work index Wi RM for intermediate sized particles 25 3 mm and a ball mill work index Wi BM for small particles d 005 mm W is the work index measured in a laboratory ball mill kilowatt …

The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure 3.10), a question arises as to whether this practice will alter the ball mill work index (BW i) of the …

Comparative assessment of the bond ball mill work index tests the article presents the review studies and classification of the existing methods of the bond ball mill work index …

Bond Tests Mining SGS South Africa. Similar to a Comparative Work Index, this test is an open circuit dry batch grindability test run in the standard Bond Ball Mill for a set time It can be used at mesh sizes from 65 to 200 mesh normally 100 mesh The test requires calibration against the standard Bond Ball Mill Work Index test to estimate the Work Index...

A quick method for Bond work index approximate value determination. 11 Aug 2016 Comparative experiments for the Bond work index value Karra 1981 modified the method of Kapur considering that the Bond standard test grinding kinetics in the Bond ball mill and established a series of relationships

See this useful summary Table of Bond Work Index by Minerals. For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was received crushed appropriately for the ball mill test.

comparative bond ball mill work index. JK Bond Ball Mill Test - JKTech Use of Work Index Since its introduction in the 1960s the Bond Ball Mill Work Index (BBMWi) parameter has been extensively used in predicting ball mill power draw. Along with comminution circuit design the work index parameter is widely used in tracking mill performance.

Bond Mill Work Index Of Limestone Ball Mill. 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 …

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.

on Fred Bond's Ball Mill Grindability Work Index (BWi) testing methods. After the tests were completed, statistical analysis using the Q …

Jan 01, 2009 1.. IntroductionA 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).This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling, for estimating the energy required for grinding, …

Comparative Bond Ball Mill Work Index. 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 This index is widely used in the mineral industry for comparing the resistance of different materials to ball milling ...

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. The work index is computed using the following empirical equation revised by Bond in 1960, where the sieve opening at which the test is made, (microns) 358 (2)

The paper presents comparative studies aimed at reducing labor costs of Bond Ball Mill Work Index test (BWi) by using a number of alternative techniques. Methods of Ahmadi and Shahsavari, Berry and Bruse, Gharehgheshlagh, Horst and Bassarear, Kapur, Magdalinovich, a standard Bond test with feed sizing into limited size grades, and a ...

modified or comparative bond ball mill. Bond Tests SGS. Modbond Grindability Test Similar to a Comparative Work Index, this test is an open circuit dry batch grindability test run in the standard Bond Ball Mill for a set time. It can be used at mesh sizes from 65 to 200 mesh (normally 100 mesh). Comparison of grinding media—Cylpebs versus balls

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, which shows that the procedure is a.Typical values of Bond ball mill work index for soft oxidised ...

PDF | The article presents the review, studies and classification of the existing methods of the Bond Ball Mill Work Index determination. The scope of... | Find, read and cite all the research you ...

For Ore A a Bond ball mill work index value of 17 kWht was reported. For ore B a Bond ball mill work index value of 15 kWht was used. Further comminution tests will be required in the future to confirm this is representative of the ores to be processed. The bond index values generally indicate that grinding is moderate power consumer. Read More

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 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 …

However, this requires a significant amount of ore samples, a lot of labor and the pilot plants. Fred Bond published an article in 1961, which, described the procedure for testing ores for a Bond Ball Index. This parameter is still one of the most demanded tools in the design, evaluation and optimization of ball grinding plants around the world.

The deviations of the data of these methods from the actual values of the Bond Ball Mill Work Index are reported together with the approximate man-hours and equipment involved in the testing procedures. ... Lvov V. V. Comparative assessment of the bond ball mill work index tests. MIAB. Mining Inf. Anal. Bull. 2021;(1):130-145. [In Russ]. DOI ...

The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill It can be used to determine the grinding power required for a given throughput of material …

Comparative bond ball mill work index comparative bond ball mill work index a bond ball mill work index test is a standard test for determining the ball mill work index of a sample of …