Bond Ball Mill Work Index Xsm

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Bond Work Index Procedure and Method

06.06.2015· 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. Below describes in general terms the Bond Work Index …

Bond Work Index Formula-Equation

The ball mill work index laboratory test is conducted by grinding an ore sample prepared to 100% 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 (Wi B or BWi). The work index calculations across a narrow size range are conducted using the appropriate laboratory work index determination for the …

Correction of Bond Ball Mill Work Index Test for Closing ...

07.12.2018· 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

bond ball mill work index determination

Bond Ball Mill Work Index Determination The average useful work input to the standard ball mill is 65 joulesRev with 115 joulesRev to the rod mill The crack energy Ce of the sample tested is found by dividing joulesRev by CmRev The standard work index can then be found by transposing Eq 16 and solving for Wi100. More Details Determination Of The Bond Work Index …

Procedure for determination of ball Bond work index in the ...

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 …

20150505 Bond Efficiency-GMG-ICE-v1-r04 Determining the ...

WiBM Bond Ball Mill Test Work Index (kWh/t) Wic Bond Impact Crushing Test Work Index (kWh/t) WioACT Actual Operating Bond Work Index determined from measurements on the circuit (kWh/t) WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy requirement at the drive pinions. 3.KEYWORDS Work Index, Work Index Efficiency, Bond Work Index …

A Comparison of Test Procedures for Estimating the Bond ...

Both procedures were conducted using a standard Bond test mill. INTRODUCTION The Bond ball work index is widely used in the field of minerals processing as an indicator of ore grindability. The work index is determined by means of …

Operating work index is not the specific energy consumption

24.10.2018· 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 ...

SMC Test® Minerals Processing Comminution Testing - …

The results from conducting the SMC Test® are used to determine the drop-weight index (DWi) which is a measure of the strength of the rock as well as the comminution indices Mia, Mih and Mic. In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing: AG and SAG mills, Ball mills, Rod mills…

P80 of Bond ball mill Work Index tests

04.12.2020· The laboratory procedure for running a Bond ball mill work index test requires that the operator choose a closing screen sieve size. The instruction is …

INTENSIFICATION OF BOND BALL MILL WORK INDEX …

Request PDF | On Jun 20, 2017, Vladislav Lvov published INTENSIFICATION OF BOND BALL MILL WORK INDEX TEST THROUGH VARIOUS METHODS | Find, read and cite all the research you need on ResearchGate

Procedure for determination of ball Bond work index …

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 lengthy and complex one and is therefore susceptible to procedural errors. Starting from the …

(PDF) A quick method for bond work index approximate …

This study aims to develop a new approach toward estimating the Bond ball mill work index (BBWI) by applying a series of kinetic grinding tests with Bond standard mill. Establishing a …

USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE

can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M . ic. and M. ih. values are also provided as a standard output from a SMC Test ® (Morrell, 2009). The general size reduction equation is as follows (Morrell, 2004. b): f x f x 2. 1 i i. 4 2 W M x x. 1 (1) where . M. i = Work index related to …

SMC Test® Minerals Processing Comminution Testing - …

In conjunction with the Bond ball mill work index they can be used to accurately predict the overall specific energy requirements of circuits containing: AG and SAG mills, Ball mills, Rod mills, Crushers, High Pressure Grinding Rolls (HPGR). The SMC Test® also generates the JK rock breakage parameters A, b and ta as well as the JK crusher model's t10-Ecs matrix, all of …

Comminution testing - JKTech - University of Queensland

30.07.2020· 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 ...

Operating work index is not the specific energy …

24.10.2018· 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 ...

A New Approach to the Calculation of Work Index and the ...

The work index . W. i. was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. The calculation is based on the size-energy relationship . 1,2 21. 11. nn. eC. x , which for . n = 0.5, x. 1 = ∞ and . x. 2 = 100, by definition gives . e. ∞,100 = W. i. and consequently . C = 10. W. i. In theory, for a given ...

Relationships between comminution J energy and product ...

Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS. The concentrate weight recovery was in the order of 50–60%. Furthermore it may be observed that the Bond ball mill work indices for the ore (Wi) varies from 14.6 to 20.9 kWh/t. The relationship between the ore hardness and iron content …

P80 of Bond ball mill Work Index tests

04.12.2020· The laboratory procedure for running a Bond ball mill work index test requires that the operator choose a closing screen sieve size. The instruction is …

INTENSIFICATION OF BOND BALL MILL WORK INDEX …

Request PDF | On Jun 20, 2017, Vladislav Lvov published INTENSIFICATION OF BOND BALL MILL WORK INDEX TEST THROUGH VARIOUS METHODS | Find, read and cite all the research you need on ResearchGate

Determination Of The Bond Work Index Using An …

Numerically, the work index is the energy required in kwh/t to reduce a given material from theoretically infinite feed size to 80% passing 100 microns. 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 ...

USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE

can be determined using the data generated by a conventional Bond ball mill work index test (M. ib. is NOT the Bond ball work index). M . ic. and M. ih. values are also provided as a standard output from a SMC Test ® (Morrell, 2009). The general size reduction equation is as follows (Morrell, 2004. b): f x f x 2. 1 i i. 4 2 W M x x. 1 (1) where . M. i = Work index related to …

comparative bond ball mill work index-mining …

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Comminution testing - JKTech - University of Queensland

30.07.2020· 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 ...

Comparison of UCS to Bond Work Indices

FIGURE 6: BOND BALL MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 WiBM (metric) Figure 6 displays the plot of ball mill Work Index (Wi BM) versus UCS. Still no relationship is observed. FIGURE 7: SUM OF BOND WORK INDICES v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 …

A New Approach to the Calculation of Work Index and the ...

The work index . W. i. was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. The calculation is based on the size-energy relationship . 1,2 21. 11. nn. eC. x , which for . n = 0.5, x. 1 = ∞ and . x. 2 = 100, by definition gives . e. ∞,100 = W. i. and consequently . C = 10. W. i. In theory, for a given ...

Relationships between comminution J energy and product ...

Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS. The concentrate weight recovery was in the order of 50–60%. Furthermore it may be observed that the Bond ball mill work indices for the ore (Wi) varies from 14.6 to 20.9 kWh/t. The relationship between the ore hardness and iron content …

Orway Mineral Consultants Canada Ltd. Mississauga, ON ...

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 (Ai). Over the years, it has been determined that Efficiency Factors (EF1 to EF9) should be applied to Equation 1 to drive the corrected power requirement (Rowland, 1982). The equation for Third Theory of Comminution Bond…