Dec 04, 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 to choose a
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 locked-cycle test where ground product is removed from test cycles and replaced by fresh feed. The test much achieve a steady-state before completion.
Jan 17, 2022 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 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, which is used at Anaconda Research Center to approximate the work index, is an alternative procedure to ...
The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. ... Kinetic grinding test approach to estimate the ball mill work ...
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.
GMSG GUIDELINE DETERMINING THE BOND EFFICIENCY Bond Test WIs (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 m (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod
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.
A comparative analysis was made with simulation results, using various methodologies, of the ball mill Bond test based on real values of the work index. This
Oct 24, 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 ...
Bond EfficiencyGMGICEv1r04 Determining the . Where, WioACTis the Actual Operating Bond Work Index (kWh/t), W is the specific energy input (kWh/t), P80 is the 80% passing size of product (m), and F80 is the 80% passing size of circuit feed (m) 2 Calculate the Standard Circuit Bond Work Index (WiSTD) for the material being processed (equation 3)
Ball Mill Wio, BWio 8.6 Circuit Wio, OWio 14.6 Bond Ball Mill Work Index, BWi, kWh/t 13.4 Bond Rod Mill Work Index, RWi, kWh/t 18.1 Table 1. Example of AG/SAG 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 ...
2 days ago Design engineers generally use Bond Work Index and Bond energy equation to estimate specific energy requirements for ball milling operations. Morrell has proposed different equations for the Work Index and specific energy, which are claimed to have a wider range of application. In this paper an attempt has been made to provide a comparison of these two
Aug 01, 2003 The Bond grindability testing procedure has been standardized to obtain the same grindability values, i.e., Bond work index (BWi), on the same ore when tests are performed in different laboratories or by different operators. This is accomplished by the standardization of mill dimensions, tumbling speed, grinding-ball charge weight and distribution, sample charge
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 m (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
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 100% passing size of 3.35 mm.
Dec 07, 2018 The goal of this work is to create an equation to adjust a Bond ball mill work index from one P 80 basis to another. The proposed model consists of two components, the variable coefficient that is determined from a specific work index determination and a fixed exponent determined by a calibration procedure.
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 1930s. It requires a specific 305mm diameter x 305mm long (inside dimensions) horizontal axis ball mill without lifters
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 Index (BWI) is used for the range from 2.1 mm
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...
Bond Ball Mill Work Index. GTEK Bond Ball Mill Work Index is used for determine the grindability of materials, and help to choose the most suitable type and model of grinding equipment. Ask For Quote Donwload. Find more details in the options below. Photo.
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.
Sep 12, 2019 The paper presents the relative errors of the obtained value from the actual Bond Ball Mill Index, the average working hours for the testing procedure and necessary equipment. Keywords Ball Mill Work Index, Bond Index, Grindability, Ball grinding, Ore testing, Grinding energy consumption, Physical and mechanical ore properties
This Work Index Ball Mill, additionally called plant for measuring bond work record, is a key gadget for measuring granulating work list. It is broadly utilized by showing and investigating divisions for grind ability test. The Work Index Ball Mill is a flat round and hollow turning gadget, external apparatus, the two positions, cross section ...
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,
Oct 18, 2018 Bond Work Index (BWI) Test. Celtest have the capability to carry out the Bond Work Index (BWI) Test in accordance with EPRI Report CS3612 FGD Chemistry and Analytical Method Handbook, Volume 2 . The BWI is used to estimate the required mill power per ton of product (Specific Energy). The specific energy requirements and the desired production ...
Essa Bond Test-Work Equipment. Internationally accepted mineral metallurgical standard test procedures to determine the physical properties of ores include the Bond ball mill work index and the Bond rod mill work index. These are empirical indices determined by close circuit grindability tests developed by F.C.Bond in the mid 1930s.
Bond Test WIs (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 m (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod
Apr 19 2013 Bond ball mill work index given by the equations Table 1 shows work index and parameters of Revista de Metalurgia 42 1 pp 4148 . effect of operational variables on ball milling Poli Monografias UFRJ .
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
XMGQ305 Grinding Work Index Ball (Rod) Mill . Description XMGQ305 Grinding Bond Ball (Rod) Mill is mainly applied for testing the grinding work index of the material of every kinds of ores, slag, etc. Under the specific rotation speed for dry grinding, then screening the products, weighing, repeat operation several times, getting the ...
Oct 28, 2021 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. This measurement is expressed in kilowatt-hour per ton (kWh/t), which is the ...
In this regard calculation of work index of limestone made by standard Bond grindability test. Ball mill was employed to conduct the grinding test of seven different samples. Among all seven samples collected from the different faces of quarry, Bond work index of limestone Face4A results less than 20kwh/t, remaining 6 samples are marked as hard -
The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill apparatus.The SAGMILLING.COM models expect a mill with a wave liner, and is not compatible with mills using smooth liners.
2 The Bond work index refers to the measure of the materials hardness or resistance to crushing and grinding, and is numerically expressed as the kilowatt hours per short ton required to reduce the material from theoretically infinite feed size to 80% passing 100 .m. 2 It is calculated using the equation below W i 4.45 P i 0 ...