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Bond Work Index an overview | ScienceDirect Topics
The Bond work index is not solely a material constant but is influenced by the grinding conditions For example, the finer the grind size desired, the higher is the kWh/t required2015年6月19日· This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on ‘around the world sample’ You can find the SG of each mineral samples on theTable of Bond Work Index by Minerals 911 Metallurgist
Bond Work Index an overview | ScienceDirect Topics
The Bond work index ( Bond, 1960) is based on Bond’s law, which states that the energy consumed is proportional to the 15 power of particle size rather than the square of Rittinger’s law Accordingly, the energy consumed in reducing the particle size from x F to x p (both measured as 80% undersize) is given by2013年7月15日· When Erf/Erp is greater than 129, the work index increases as the product size decreases, and when Erf/Erp is less than 129 the work index decreases Eq (8) suggests that a standard work index Wi100, or the work index at 80% passing 100 microns calculated from the exposure ratios, can be found from the following Eq (9):Bond Work Index FormulaEquation 911 Metallurgist
Comminution testing JKTech University of Queensland
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 335 mm, as required for the Bond Ball Mill Work Index test feedThe Pendulum Tester / Bond Impact Crushing Work Index Tester Working principle Crushing by impact 76 mm maximum feed size Test repetition: At least 10, preferably 20 test runs The Bond Crushing Work Index (CWI) describes the competency of the ore at larger particle sizes It is used for the calculation of the actual crusher power requirementsBond Impact Crushing Work Index Tester 911 Metallurgist
Table of Bond Work Index by Minerals 911 Metallurgist
2015年6月19日· 9 Zircon Sand 200 This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on ‘around the world sample’ You can find the SG of each mineral samples on the other table Source 1: Table of materials reported by Fred Bond Source 2: Outokumpu, The science of comminution Source 3: Equipment and pipelines Source 4:Work Index, Work Index Efficiency, Bond Work Index testing 4INTRODUCTION AND BACKGROUND The Bond method allows for quantification and comparison of relative energy efficiencies of most industrial comminution circuits It is an essential tool for managing the important business (cost) of grinding For early analyses of plant grindingDetermining the Bond Efficiency of industrial grinding circuits
Using Rock Geomechanical Characteristics to Estimate Bond Work Index
2021年10月28日· 22 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]13 Limestone 16 Gold Ores The kilowatthours per tone (kWh/t) will work out your work index The number of kittowatts consumed in a hour divided by the tonnes of rock gives you your work index Remember, the higher the Work Index the more work required to crush the rock This will impact the equipment chosen for your projectThe Importance of Work Index in Mineral Processing MAX Plant
1 Comparison of measures of rock crushability ResearchGate
6 LM Tavares & MACW da Silveira The Bond work index has also been used, in conjunction with empirical relationships, to estimate capacity factors of jaw, cone and gyratory crushersBond Ball Mill Grindability Test The Bond Ball Mill Work Index (BBWi) test is carried out in a standardised ball mill with a predefined 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 stagecrushed to 100%Bond Work Index Tests | GSL
CA Rowland Springer
operating work index is given as kilowatt hour per metric ton (kWh/t), then the calculated work index is power per metric ton For closedcircuit grinding, F is the feed to the circuit before adding the circulating load, and P is the product after removing the circulating load Bond (1952, 1960) defined the work index as "The comThe Bond work index determination according to the standard Bond's test is done on all these samples with comparative sieve size of 74, 105 and 150 microns The Bond Work Index is calculated using the formula (Bond, 1961): (√ √) (1) where: W i – Bond work index (kWh/t); P c – test sieve mesh size (µm);THE BOND WORK INDEX OF LIMESTONE AND ANDESITE
Crushing Work Index for PQ Core sample 911 Metallurgist
The Bond crushing work index test procedure is not terribly well described, and different laboratories have different procedures that can result in different results (by up to 50% +100%) I am not aware of the calibration of the test being checked in over 50 years, so it is impossible to say which procedure is "correct"The Thirtynine samples were submitted for the Crusher Index (Ci), SAG Power Index (SPI®), Standard Bond Ball Mill Work Index (BWI) and Modified Bond Ball Mill work Index (MBI) tests The Ci, SPI® and Bond Wi values of these samples show a good indication of ore hardness variability within the ore bodyModified Bond Ball Mill Work Index Test 911 Metallurgist
Bond Abrasion Index Tester 911 Metallurgist
Mathematical correlation with the work index has not been reliably established The abrasion index is used as an indicator of metal wear and crusher and mill liner life expectancy A high abrasion index, for example > 06 would suggest a preference for a single stage crusherSAG mill circuit to avoid multiple stages of crushing and costly liner2015年12月26日· The Bond’ Crushing Work Index is common to calculate the power needed to crush rocks from a given F80 size to a resulted P80 product size Bond’s impact method comes from a double mirrored pendulum impact crusher test on <76mm but >51mm (3″ and 2″) square rock piecesCrushing in Mineral Processing 911 Metallurgist
Bond Rod Mill Work Index Equipment & Apparatus Review 911
2016年3月31日· Unrelated ‘entertaining’ image The specification for the apparatus to determining a “Bond” rod mill work index is first described in Bond & Maxton (1943) It states that the apparatus is a tumbling rod mill to be operated in a locked cycle test at a fixed circulating load The geometry of the grinding chamber is described as: mill2016年10月10日· The Bond work indices (or “impact work index”) can be used for estimating the crushability of material and the crusher’s energy consumption The crushability value can be used for estimating the degree of difficulty of the material tested The dynamic fragmentation value gives an indication of the material’s resistance againstFrench Crushability & French Abrasion Index 911 Metallurgist
SAG mills selection methods III The F Bond index calculation (crushing)
2020年3月10日· The F Bond Pendulum crusher Carring on with a theme that we’ve already touched in the previous publication, we will consider the methodology of the F Bond index calculating As you know, there are three calculation methods The method selection depends on the crushing/grinding stage (the power size and the necessary finishedFIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 05 1 15 2 WiRM/WiBM (metric) Siddall et al (1996) identified the ratio of Bond rod mill Work Index and ball mill Work Index as being indicative of an ore’s compentency Figure 8 plots this ratio versus UCS; no trend isComparison of UCS to Bond Work Indices