Conversions between test types
A Non-standard rod mill result can be converted to a Bond rod mill work index by: Bond Wi RM = 0.49 × (Wi nonstandard)^1.17 Source: Dec 2021 Public Grindability Database Bond rod mill Wi versus A×b for copper …Web
اقرأ أكثرBond´s work index estimation using non-standard ball mills
The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (α=0.23; β= 0.82, and γ = 44.5), are unable to predict the Work Index ...Web
اقرأ أكثرProcedure for determination of ball Bond work index in the …
The Frederick C. Bond has several grinding indices (ball, rod, abrasion), one of which has been a significant guide for ball mills. The Bond ball mill work index is an expression of the material's resistance to ground and a measure of the grinding efficiency. ... that the revolutions required in all the Bond Work index mill tests conducted ...Web
اقرأ أكثرDetermining the Bond Efficiency of industrial grinding circuits
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 …Web
اقرأ أكثرSimulating the Bond rod mill grindability test
The Bond rod mill grindability test is a widely used tool to estimate the response of ores to rod milling. However, the mass of ore required to conduct the test, which can typically vary from about 8 to as much as 20 kg, may represent a challenge when sample availability is critical.The present work proposes an alternative procedure, which …Web
اقرأ أكثر(PDF) Power-based comminution calculations using Ausgrind
Bond rod mill work index 19.0 kWh/t . Fraction of crit. speed 0.72 . Bond ball mill work index 17.1 kWh/t . Ball volume (nominal design) 12 % Total filling (nominal design) 25 % Crusher Circuit .Web
اقرأ أكثرKinetic grinding test approach to estimate the ball mill work index
The standard Bond method is a tedious time consuming procedure requiring at least 7 - 10 grinding cycles, so that many researchers have tried to simplify this method to be able to perform a rapid ...Web
اقرأ أكثرRod Mill
3.4.7. Bond rod mill standard testStandard conditions for determining the work index of rod mills under laboratory conditions are: mill size = 305 mm (internal diameter) × 610 mm (internal length) with wave type lining ... Bond had used short tons to determine work index. To convert to metric tons the factor 1.1 has been used here, (62 × 1.1 ...Web
اقرأ أكثرRapid determination of Bond rod-mill work index by modeling the
To calculate the Bond work index ( Wi) in a standard laboratory scale rod-mill, Bond derived the following equation: (1) W i = 62 P i 0.23 G i 0.625 10 P - 10 F kw h sh t where F is 80% passing size of original feed, P is 80% passing size of circuit product and Pi is the test-sieve size in μm [1]. The standard procedure to determine all Bond ...Web
اقرأ أكثرCrushing work index Calculation
The Bond crushing work index test (sometimes called the "impact work index" test) is noisy, and the difference you observed is perfectly reasonable. The paper by Angove & Dunne (1997) reports a standard deviation in crushing …Web
اقرأ أكثرMetallurgical testwork demonstrates low-cost crushing and …
Bond Work Index – Rod Mill (RWi) The Bond Rod Mill index (RWi) is a measure of the resistance of the ore to grinding to a coarse product size. Table 4 shows the RWi for each composite – note that the oxide composite was not competent enough for measurement using the RWi test, and thereforeWeb
اقرأ أكثرBond Tests | SGS Canada
The test determines the Bond Rod Mill Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied. The test is a closed-circuit dry grindability test performed in a standard rod mill. It can be performed at mesh sizes ranging ...Web
اقرأ أكثرUsing Rock Geomechanical Characteristics to Estimate Bond …
A Bond rod mill work index test (BRMWI) is a standard test for determining the rod mill work index of an ore sample [21]. The BRMWI is a measure of the …Web
اقرأ أكثرHardness Archives
Commentary on the apparatus of the Bond rod mill Work Index by Alex Doll December, 2015 alex.doll@sagmilling The Bond "Third Theory" of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his collaborators) were gathering the …Web
اقرأ أكثرBOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work index methodology ...Web
اقرأ أكثرBond ≠ Ball
The Rod mill work index is one type of a Bond work index, applicable to the size range of rod milling (very roughly, 12 mm to 1 mm). The Low-energy Impact Crushing work index is another Bond work ...Web
اقرأ أكثر(PDF) Variability Study of Bond Work Index and Grindability Index …
In the paper proposed by García et al. [5], a deep study on the Bond ball-mill and Bond rod-mill standard tests is shown with different ores. The most impacting result of this work is the ...Web
اقرأ أكثرBOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T
Work index is the relation between the SEC and the amount of breakage in an ore. The most common form of this relationship is given as Equation 1, and is often referred to as …Web
اقرأ أكثرBond Work Index Formula-Equation
The basic work index equation is: W = 10 Wi/√P – 10 Wi/√F………………………………………………………………………… (1) where W is the …Web
اقرأ أكثرOperating 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 ...Web
اقرأ أكثرRapid determination of Bond rod-mill work index by modeling the
To calculate the Bond work index ( Wi) in a standard laboratory scale rod-mill, Bond derived the following equation: W i = 62 P i 0.23 G i 0.625 10 P - 10 F kw h sh t where F is 80% passing size of original feed, P is 80% passing size of circuit product and Pi is the test-sieve size in μm [1]. The standard procedure to determine all Bond work ...Web
اقرأ أكثرComparison of Ore Hardness Measurements for Grinding Mill …
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 eachWeb
اقرأ أكثرComparison of UCS to Bond Work Indices
FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. …Web
اقرأ أكثرBall Mill Design/Power Calculation
The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and …Web
اقرأ أكثرBauxite grindability at elevated temperature in various mills
Chongbo and Bingchen (1992) developed a new method of simulating the calculation of the Bond rod mill work index by using the nth order grinding kinetic test data of the feed. Five kinds of ores (Fe ores, Pb-Zn ore, Au ore, Mn ore) were investigated during the research. In this way the Bond rod mill work indices of any size of product can be ...Web
اقرأ أكثرDetermining the Bond Efficiency of industrial grinding circuits
1. Calculate the Actual Operating Bond Work Index of the grinding circuit. • Estimate the F80 and P80. • Calculate the work or specific energy input from the size reduction …Web
اقرأ أكثرAn Overview Of the SmAll-ScAle teStS AvAilAble tO …
world. It shows that the ball mill work index is normally distributed with an average of 14.6 and a median of 14.8 kWh/t. bOnd rOd mill GrindAbility The Bond Rod Mill Grindability Test is performed similarly to the ball mill test. The feed sample is stage-crushed to ½" and the test is run under a circulating load. As inWeb
اقرأ أكثرBond Work Index Tests | GSL
The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a pre-defined media and ore charge. ... GSL can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from ...Web
اقرأ أكثرGMSG GUIDELINE: DETERMINING THE BOND …
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 µWeb
اقرأ أكثرDetermination of work index in a common laboratory mill
In the Bond ball mill test, the work index is finally obtained. by. w. P Gbp PF. i = ... [Show full abstract] different characteristics of rod mill and ball mill, solving the grinding problem of ...Web
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