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 work index tests across laboratories as 4.5.
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. Any screen size below 600m can be used for the testwork depending on your requirements. Bond Rod Mill Grindability Test
The Bond work index (Bond, 1960) is based on Bonds law, which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of Rittingers law. Accordingly, the energy consumed in reducing the particle size from x F to
The work index . W. i. was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. The calculation is based on the size-energy relationship . 1,2 21. 11. nn. eC. x , which for . n 0.5, x. 1 and . x. 2 100, by definition gives . e. ,100 W. i. and consequently . C 10. W. i
parameter called Work Index (WI). The Work Ind ex of a material is impor tant for the selection of a crusher type, size, eccentric throw, setting and motor size. In practice, the energy measurement according to Bonds method is carried out with an impact-testing machine. The impact strength of a rock is an important m easure of its toughness and crushability.
rod mill work index classification. Bond Work Index Formula-Equation. Bond Work Index Tests Grinding Solutions offers a range of Bond Work Index Testing from crushability and abrasion to ball and rod mills For more information on the tests please see below Bond Low Energy Impact Test The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known
Bond Work Index Tests. Grinding Solutions offers a range of Bond Work Index Testing from crushability and abrasion to ball and rod mills. For more information on the tests please see below Bond Low Energy Impact Test. The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index.
Dec 01, 2007 An impact pendulum that follows strictly Bonds standard for crushability measurement (Bond, 1947, Bergstrom, 1985, Tavares, 2007) has been used, which allows calculating the crushing, or impact, work index.The test consists of dropping two pendulum-mounted hammers simultaneously against individual particles of size ranging from 75 to 50 mm that are sitting on a pedestal ().
A modified work index (crushability) test device has been used to determine the embodied energy of aggregate resources. The initial research has focused on Carboniferous limestone as worked in central .... consultants or experts working for equipment suppliers. ... 2006), and the Bond Crushing Work Index, otherwise. Read more
1, according to Bond 2 n 0.5 and according to Charles 3 and Stamboliadis 4, n. can take any value near these two. In the case that the initial size is infinite and the final size is 100 m then by definition the required specific energy is called work index . W. i ,100 e W. i (2) The value of the constant . C. in (1) can be calculated
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 weight in the mill and ...
Crushability CLASSIFICATION CRUSHABILITY (%) BOND WORK INDEX (KWH/T) LOS ANGELES VALUE UCS (MPa) Very Easy 50 0 - 7 27 0 - 90 Medium 40 - 50 7 - 10 22 - 27 90 - 150 Difficult 20 - 30 14 - 18 12 - 17 220 - 300 Very Difficult 10 - 20 18 5 - 12 300 Abrasiveness CLASSIFICATION FRENCH ABRASIVENESS ( G/TON) ABRASION INDEX Non Abrasive 0 - 100 0 ...
grinding cycles. The Bond Work Index is calculated using the formula 1,1 44,5 0,23,82(10 80 10 80) (1) where W i Bond work index (kWh/t) P c test sieve mesh size (m) G weight of the test sieve fresh undersize per mill revolution (g/rev) F 80 sieve mesh size passing 80% of the feed before ...
Sep 01, 2017 Results showed that the blasting process can reduce the Bond work index of fragments as much as 18% and enhances their crushability by 9.5%. Moreover, using different explosives brought about sensible changes in results, so that substituting ANFO with pentolite or emulite decreased the Bond index by 9.2% and 6.7% respectively, and increased the ...
crusher were compared with those of the Bond crushing energies (estimated from the Bond crushability index) of the rocks. Also, the effect of the Bond crushability index on the estimated crushing energy of the rocks was studied. Materials and methods In this work, nine different rock specimens were obtained from some mines in Iran.
4.4.1 The Bond Rod Mill Work Index 21 4.4.2 The Bond Ball Mill Work Index 21 4.5 Bond Crushability Work Index and Abrasion Index (Sandvik) 22 4.6 Dry LIMS 22 4.7 Wet LIMS 23 4.8 Davis Tube Recovery (DTR) Testwork 23 4.9 Shaking Table 25 4.10 Wet MIMS and HIMS (HGMS) 25 4.11 Flotation 26 4.12 Selective Flocculation 27
Bond Crushability Work Index Bond Abrasion Work Index qJK Tech Testing JK Drop weight Test SAG Milling Comminution Test (SMC) COMMINUTION PILOT PLANT qAG/SAG Pilot Milling Mill dimensions 1.7m x 0.6m length Typical throughput 0.5 -3.5 t/h depending on ore characteristics and circuit
Bond Crushability Work Index kWh/t 8.8 to 9.8 Bond Abrasion Index 0.03 to 0.05 Bond Rod Work Index kWh/t 10.0 to 10.2 Bond Ball Work Index kWh/t 212m kWh/t 106m 11.61 to 11.98 13.2 to 13.3 Scoping Mag Separation Test Feed Grade % Fe Non Mag Grade % Fe 52.3 45.5 Scrubbing at 30 and 16 mm feed ...
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GRINDABILITY TESTS Bond Rod mill work Index The rod mill work Index is also normally distributed with and average and median of 14.8kWh/t It is common to observe difference between the ball and rod mill caused by variation in ore hardness The test has been mainly used for the design of rod mill or primary ball mills. http ...
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Conducted metallurgical test work i.e. bond ball work index, bond rod work index, crushability PR/PN operator of Ni, Co, Sc pilot processing plant project using HPAL, PR/PN and cRIP technology CCD operator on Pb pilot processing plant project
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Bench scale comminution tests including Bond Ball Work Index,Bond Rod Work Index, Crushability work Index and Abrasion Index,grindability test and stirred media milling for ultra fines. Daily activities included particle size distributions and mass/materials balances. I also have knowledge in flotation of PGMs ore samples.
Sep 08, 2015 Bond crushability work index testwork results indicates that the ore can be classified as soft to very soft to crush. Bond abrasion index values (Ai) of 0.1 g, 0.05 g and 0.02 g were obtained for Composites A, C and D respectively, indicating that the material was of low abrasion tendency.
LAARMANN321 . 1500 x 675 x 1200 mm 300 kgs (only machine) 230V/50Hz/60Hz Variable 0-80 rpm 0.75KW Bond Crushing Work Index (CWI) The Bond Crushing Work Index (CWI) describes the competency of the ore at larger particle sizes.
- Comminution - Bond Ball Word Index, Crushability Work Index, SMC, JKDropweight etc - Base Metal Acid Leaching - Bottle Roll Tests, Heap leaching. - Cyanide detoxification (Batch and Continuous) - Rheology - Viscosity testing - Davis Tube - Satamagan Responsible for Proposal writing, Invoicing, project management etc.
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The traditional Bond work index proposed by F.C. Bond over 60 years ago is still today a useful tool for characterizing material crushability and grindability in the minerals industry.
The Bonds 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 m. If the breakage characteristics of a material remain constant over all size ranges, the calcul ated work
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Nov 01, 2014 2.2. Crushability work index measurement. Particles of broken phosphate rock passing a 75 mm square gird and retained on a 50 mm square were mounted between two opposing equal 13.6 kg weight which swing on bicycle wheels.When the wheels were released the weights impact simultaneously on opposite sides of the measured smallest dimension of the rock.
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