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For more practical calculations using 80% passing the 100 micron mesh, the Bond Ball Mill Work Index (BBMWi) is widely used to measure the grindability of a mineral, described in kilowatt hours per ton (kWh/t). 1 In reference to cement clinker grinding, the …
Bond Work Index Formula-Equation
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 passing size of <3.35 mm.
Correction of Bond Ball Mill Work Index Test for Closing ...
porphyry orebodies. Total of 38 Bond work index tests, including duplicates, were done. Standard Bond ball mill test procedure were carried out on crushed (-3.35 mm / 6 mesh) material at different screen closing sizes (300 µm, 212 µm, 150 µm, 106 µm, and 75 µm). The screening process was
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The 2012 grindability test results showed that the Bond ball millwork index (BWi) tests ranged from 6.5 to 11 kWh/t and abrasion index (Ai) tests fluctuated from 0.017 to 0.072 g for the mineralized samples. The data indicate that the samples are neither resistant nor …
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JK Bond Ball Mill Test; Our flotation ore characterisation test is the JKTech Floatability Index (JKFi) Test. JK Drop Weight Test and SMC Tests® are licenced to 48 metallurgical laboratories globally. To date, over 55,000 JKTech accredited A x b tests have been completed across more than 32 different commodities.
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CORRELATION BETWEEN BOND WORK INDEX AND …
3- STANDARD BOND TESTS The Bond's standard ball mill is used to determine the work index value of differ ent samples. The Bond work index is defined as the kilowatt-hours per short ton required to break from infinite size to a product size of 80% passing 100 µm. If the breakage
Bond S Law For Crushing Mills - aquacristal.fr
bond 3fs law for crushing mills. Relationships between comminution J energy and product. ball/rod mills and has become more likely a standard. The general form of Bond's equation is as follows: [6] where W is the work input (kWh/t); Wi is the work index (kWh/t) which expresses the resistance of the material to crushing and grinding; and F80 and P80 are the 80% passing size …
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Comminution testing - JKTech - University of Queensland
The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions. It is a 'locked cycle' test conducted in closed circuit with a laboratory screen.
TITLE: Keys To Best Practice Comminution
In all cases, understanding of the transfer size (T80) to the ball mill is critical to achieve best economics in a SAG mill grinding plant. T80 is important to operators because when SAG energy and Bond Ball Mill Work Index on SAG ground ore are measured, accurate prediction of future throughput in any SAG circuit is possible. Without the
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• Maximize the Net Present Value whilst minimizing risk. ... (Sag Pressure Index) Test • Bond Ball Mill Grindability Test • Bond Impact Test ... Autogenous Grindability Test • MacPherson 18" Mill Test Well-instrumented pilot-scale autogenous grinding circuits, ball and rod mill circuits, and crushing circuits are also available ...
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wordnet_worker_109632518 # training instances: 81463 # testing instances: 12290 # true positives: 11358 # false positives: 1157 # false negatives: 932 precision: 0.907550938873352 recall: 0.9241659886086249 F1: 0.93055
THE COMMINUTION CIRCUIT DESIGN FOR THE CONSTANCIA …
The Bond ball mill work index (BWI) data were used to determine the ball mill power requirement. Table 1 summarises the 75th percentile values for the various comminution parameters used to determine plant throughput and mill power draw. A more complete list of comminution data is provided in Appendix 1.
RELO GRINDING BODIES COMPARATIVE BOND TEST REPORT …
COMPARATIVE BOND TEST REPORT ZT64-0692/MM1307 June 2019 Final V1.0 Page 2 2 TEST RESULTS Testing was performed using the standard Bond Ball Mill test methodology on a single blended sample or ore crushed to a feed size of passing 3.35mm. A summary of the media specifications used for each test is given below in Table 2.1.
SMC Test® Minerals Processing Comminution Testing - SMC ...
SMC Data Processing. 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 ...
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Comminution tests (ball mill grindability) returned average Bond Work Index (BWI) values that categorize MET-1 as medium and MET-2 as moderately soft. More testwork will be undertaken to improve the 24- to 48-hour gold recoveries and optimize the leach residence time. Improvements are expected with these tests.
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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 and
Bond Work Index - an overview | ScienceDirect Topics
The ability to simulate the Bond work index test also allows examination of truncated ball mill feed size distributions on the work index. For grinding circuits where the feed to a ball mill is sent directly to the classifier and the cyclone underflow feeds the ball mill (see Figure 3.10), a question arises as to whether this practice will alter the ball mill work index (BW i) of the …