GMSG GUIDELINE: DETERMINING THE BOND EFFICIENCY …

Bond Work Index Testing Equipment and Procedures See Annexes A, B and C for Bond crushing, rod mill and ball mill test equipment and procedures. Accuracy of Comparative Circuit Work Index Efficiency Determinations This will follow in an addendum to this guideline Sub-topics will . include the following.

FULLY AUTOGENOUS GRINDING AT UNKI MINE …

Work Index KWh/t Unki ore 75 1906.18 57.56 18.2 150 1906.18 114.02 15.0 The above confirms that the design BWI for the primary ball mill is between 15 kWh/t and 18.2 kWh/t. As will be shown later, for sizing the primary mill motor the Bond method is used. The

COMPARISON OF THE DIFFERENT WAYS OF THE BALL BOND WORK ...

COMPARISON OF THE DIFFERENT WAYS OF THE BALL BOND WORK INDEX DETERMINING. IAEME, 2019. IAEME Publication. Download Download PDF. Full PDF Package Download Full PDF Package. This Paper. A short summary of …

THE BOND WORK INDEX OF LIMESTONE AND ANDESITE …

Bond work index value of these components mixtures is greater than the Bond work in-dex of harder components, clinker. Oner (2000) have conducted a research of clinker and blast furnace slag mixture Bond Work Index in different mass propor-tions. He found out that these values are always lower than the Bond Index obtained

A Comparative Study of Energy Efficiency in Tumbling Mills ...

Standard Bond tests showed a reduction in the Bond ball mill work index (wi) of the mineral sample used in this study when using Relo grinding media. The modified Bond test procedure is based on using the standard Bond ball work index test but changing the circulating loads (350%, 250%, 150%, ).

Bond Work Index Procedure and Method

The Work Index (BWi) is calculated according to Fred Bond's Equation. Bond Work Index for Testing Procedure Cleaning and Storing of Ball …

DETERMINATION OF WORK INDEX OF GRAPHITE FROM …

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.

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

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 …

Using Rock Geomechanical Characteristics to Estimate Bond ...

Bond Ball/Rod Mill Work Index. Bond ball mill work index (BBMWI) test is a standard test used to measure the ball mill work, which is calculated in accordance with the procedure proposed by the Bond [21]. The BBMWI determines how much energy is needed to grind a sample of ore in a ball mill [22].

Relative Bond Work Index BWi | Comparative Grindability ...

For example, GMS of –3350 + 2440µm size range equals to: (3350 x 2440µm)^0.5 = 2830µm. Repeat above procedure for the unknown sample. …

RAPID RAMP-UP OF THE TROPICANA HPGR CIRCUIT

Bond Ball Work Index kWh/t 15.3 13.2 3.0 Abrasion Index g 0.137 0.114 0.09 JKDW Axb 70.9 194.3 194.4 ... A summary of the comparative power utilisation figures for the SABC and HPGR – ball options is ... 1 The power necessary for the flowsheet is compared to the Bond Ball Mill Work Index based power that is

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 determination. The scope of the analysis embraces the methods of Aksani and Sönmez, Todorović, Berry and Bruce, Horst and Bassarear, Ahmadi, Kapur, Gharehgheshlagh, Lewis, Magdalinovich, Karra, Smith and Lee, Armstrong, as well JKTech …

INTENSIFICATION OF BOND BALL MILL WORK INDEX TEST …

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 standard ...

DETERMINATION OF THE BOND'S WORK INDEX OF BABAN …

The work index expresses the resistance of the material to grinding. It represents the kilowatt hours per tonne required to reduce the material from theoretically infinite feed size to 80 passing 100μm (Wills and Napierpercent -Munn, 2006). Bond devised several methods for predicting ball-mill and rod-mill energy requirements and

Bond Work Index - an overview | ScienceDirect Topics

Bond impact crushability work index (CWi) ( Bond, 1963) results reported for iron ores vary from hard iron ore (17.7 kWh/t) to medium hardness iron ore (11.3 kWh/t) and friable iron ore (6.3 kWh/t) ( Table 2.11; Clout et al., 2007 ).

The MiniBond test: description, calibration and sources of ...

Bond ball mill work index test, in order to have a quantitative evaluation of the success of any alternative test. Consequently, this paper presents a new test, termed the MiniBond test. The new test has more than 80 individual calibration points collected over a range of ore types, ore deposits, and closing screen sizes.

Bond Work Index Formula-Equation

There is also a JKTech Bond Ball Mill Work Index Light. Basically only does the BBMWI to 3 cycles instead of the steady state. Requires less material ie 3kg, costs less even if you do duplicates. Apparently based on their data base data they have an average error of 4% compared to 3.5% for the full BBMWI. Regards, Chris P Peter Amelunxen

Improved characterisation of ball milling energy ...

1 Comparative Bond work index data were supplied by Frank van der Meer, Evert Lessing and Ric Stocco of Weir Minerals. ... The Bond Ball Mill Work index (BBWi) is the industry standard procedure for assessing the grindability of ores. The test involves conducting a locked-cycle grinding test using ond's standard mill design.

Operating work index is not the specific energy consumption

However, Bond Work Indeces are related to the type of equipment to be used (rod mill, ball mill, SAG uses Drop Ball parameter-Kwhr/m3-, so it is more complex than just specific energy consumption ...

Table of Bond Work Index by Minerals

Source 1: Table of materials reported by Fred Bond Source 2: Outokumpu, The science of comminution Source 3: Equipment and pipelines Source 4: Tenova Bateman mills (AG/SAG, Rod, Ball Mills) Source 5: Doering international Source 6: SME handbook of mineral processing, N.L Weiss Editor, NY 1985. Bond Work Index Tester

A Comparative Study of Energy Efficiency in Tumbling Mills ...

The modified Bond test procedure is based on using the standard Bond ball work index test but changing the circulating loads (350%, 250%, 150%, ). The comparative tests with RGM were carried out at the same number of revolutions as the grinding tests with balls at respective circulating load.

Alsto Bond Index Ball Mill – Mineral Stats

Safety is a prime consideration for all Alsto equipment and the Bond Index Ball Mill is supplied equipped with acoustic enclosure. The ball mill is designed to accept a ball charge in accordance with F. C Bond's standard. This ball charge consists of 286 balls as follows: 44 x 35mm balls. 67 x 30mm balls. 10 x 25.4mm balls, 71 x 19.05mm balls ...

ABBREVIATED TEST FOR QUICK DETERMINATION OF BOND'S …

Keywords: Bond'sindex, grinding, kinetics 1. INTRODUCTION According to the standard Bond test, the Work index (Wi) is found by simulating dry grinding in a closed circuit in a Bond ball mill until the 250% circulating load has been achieved (Bond, 1949, 1952, 1961). The feed is a

COMPARISON OF THE DIFFERENT WAYS OF THE BALL BOND WORK ...

COMPARISON OF THE DIFFERENT WAYS OF THE BALL BOND WORK INDEX DETERMINING. IAEME, 2019. IAEME Publication. Download Download PDF. Full PDF Package Download Full PDF Package. This Paper. A short summary of this paper. ... Rapid determination of Bond rod-mill work index by modeling the grinding kinetics.

Comparison of Ore Hardness Measurements for Grinding …

standard Bond crushing, and rod mill work indices, abrasion indices and by Dawson for Bond Ball Mill Work Index tests using crushed feed, and Standard Autogenous Grinding Design (SAGDesign) Tests, patented by Outokumpu. (See reference 8 below). The comparison of these results gives context to how the various measurements relate to each

JK Bond Ball Mill Test

JK Bond Ball Mill Test Since its introduction in the 1960s, the Bond Ball Mill Work Index (BBMWi) parameter has been extensively used in predicting ball mill power draw. Use of Work Index Along with comminution circuit design the work index parameter is widely used in tracking mill performance. Due to the age and lack of controls for the test,

Bond Work Index Formula-equation - Mineral Processing ...

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 …

A new approach to the calculation of bond work index for ...

A Bond Work index mill ball charge and closing screen product size distributions for grinding crystalline grains Int. J. Miner. Process., 165 ( 2017 ), pp. 8 - 14, 10.1016/j.minpro.2017.05.011

RELO GRINDING BODIES COMPARATIVE BOND TEST …

Bond Ball Mill Work Index (kWhr/tonne) 18.34 17.17 The results showed the spherical grinding media to require 18.34kWhr/t of energy to grind the sample compared with an energy requirement of 17.17kWhr/t for the RELO Grinding Bodies, a difference of 6.4%.

A comparative

Ball Mill power, kW 40596 39318 40006 Pebbles power, kW 806 806 868 Pso, !liD 181 186 193 EsAC 5.72 5.53 5.22 Eaalls 10.17 9.51 8.97 Aminpro Aminpro's method is based on SPI and Bond work index scale-up methods as described elsewhere (Amelunxen & Meadows, 2011). The approach is based on the use of industrial plant audit data and

What Can Go Wrong in Comminution Circuit Design?

• 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.

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

The Bond work index is a parameter which represents a measure of an ore resistance to grinding. Numerically, the work index represents the energy ( kWh/sht) required to reduce the material of one...

Ball Mill|Bond Work Index Determination With A Sepor Batch ...

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 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.