Comminution testing to reduce risk | FL
FL's Comminution Lab offers all testing components for equipment sizing, and we thoroughly train our staff in testing procedures to ensure consistency and accuracy. We provide: Bond Crusher Work Index; Bond Abrasion Work Index; Bond Ball/Rod Mill Indices; J-K Drop Weight Test* SMC Test®* Starkey SAG Design Test* Starkey SAG …
A quick method for bond work index approximate value determination
determination Bond. work index approximate value is exactly the same as in the first two grinding cycles of. Prepare a sample, the same as for the standard Bond test (grind to . -3.327 mm ...
Crushing in Mineral Processing
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 pieces.
Correlation of crushing work index and drop …
Ore hardness can be estimated using commercially available standard techniques such as the SAG Power Index (SPI), Bond Work Index (BWI), and JK Drop Weight (JKDW) tests (Bailey et al., 2009 ...
SAG mills selection methods. III. The F. Bond index calculation (crushing)
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 finished …
BOND'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 …
Crushing Work Index for PQ Core sample
The Bond crushing work index test is an inherently poor test and has been shown time and time again in Round Robin studies to have poor precision (repeatability). Angove and Dunne's paper on the subject gives results that show factors of over 2 in terms of reported work index values from the same sample from different labs.
Bond Work Index
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 required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes. He produced a correlation between the mass of test …
(PDF) Impact work index prediction from continuum damage model …
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.
crusher work index tests
The crusher work index (cWI) or impact work index is calculated as follows: Where J is the energy at which the specimen broke, mm is the thickness of the rock specimen, and S.G. is the specific gravity of the ore. The J/mm are transformed in kWh/t as follows: The test is generally performed on 20 rocks, which is relatively small, resulting
Services Offered by 911Metallurgy
Crusher Work Index Tests – Used to calculate power requirements, and size crushing equipment. SMC Test – Used to determine energy requirements for a wide variety of comminution equipment. JK Drop Weight test – Used …
Crushing & Screening Questions and Answers for …
Crusher work index testing with PQ core. A. 3. REPLIES. 687. VIEWS. Started by aweaver I am learning about various comminution tests and I was wondering how people have previously handled CWi with whole PQ core. I realize that sample size should be between 2" and 3". Should these samples always be crushed versus cut due to the …
1 Comparison of measures of rock crushability
The crusher has a feed opening gap of 25 mm, a stroke of 4.9 mm, a cone angle of 44o (in relation to horizontal) and a mantle length of 150 mm. A constant closed-side setting of 7.6 mm was used in ...
Bond Impact Crushing Work Index -Procedure and Table of …
The test determines the Bond Impact Work Index which is used with Bond's Third Theory of Comminution to calculate net power requirements when sizing crushers*. It is also used to determine the required open-side settings (jaw …
Comparison of UCS to Bond Work Indices
FIGURE 8: ROD MILL/BALL MILL WORK INDEX RATIO v. UNCONFINED COMPRESSIVE STRENGTH 100 200 300 400 UCS (MPa) 0 0.5 1 1.5 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 …
crusher work index tests 23584
Metminco March 17 Quarterly Activities Report . 23,584. 1,221. 1,615. 0 ... Tests, Bond Impact Crushing Work Index and Bond Rod Mill Work ... The ROM ore pad is located at the primary crusher level ...
SMC Test® Minerals Processing Comminution Testing
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 ...
Impact Work Index Procedure
Impact Work Index Procedure. This is or was used by to acquire the Impact (AKA Crushing) Work Index for sizing crushers. Use this in complement to the Bond Crushing Work Index Procedure. Another Summary Table of various Impact Work Index by Rock or Mineral Type (/metric tonne). Find a referential Rod Mill Work Index …
Modified Bond Ball Mill Work Index Test
The Thirty-nine 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 body.
Comminution testing
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.
Testwork: Bond crushing work index
The Bond low-energy impact crushing work index (more informally, the Bond crushing work index) is not as common as the Bond ball mill work index, and it is a notoriously noisy test. The test is a 'per-specimen' test where individual specimens of prepared rock are hand-picked by the test operator and placed into the apparatus.
Technical Information
The SMC Test® also generates the JK rock breakage parameters A, b and ta as well as the JK crusher model's t10-Ecs matrix, all of which are generated as part of the standard report output from the test. ... As a general rule Bond ball work index tests are recommended when SMC Tests® are carried out as this provides valuable additional ...
Laboratory Crushing Tests
They can do crushability tests to determine the work index of the ore and the amount of work required as well as the compressive strength to determine the necessary strength in the crusher. However, the ore dressing research staff must be able to evaluate the results from the crusher manufacturer because, in many instances, they …
Bond Tests | SGS Canada
* Bond F. C., "Crushing Tests by Pressure and Impact", Trans AIME, Vol 169, 1947, pp 58-66. Bond Rod Mill Grindability Test. 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.
Crushing Work Index (CWi) results variation
You would see similar "noise" in point load index or unconfined compressive strength measurements (also tests on coarse rocks). For designing a primary crusher it doesn't cost much to put in a bigger motor (and the rest of the drive system), so you could design to 75th percentile or higher with a minor cost increase (your operators won't break ...
Bond Work Index
Using Magdalinovic's method, from the results of a Bond work index test at a single test screen size, the constants K1 and K2 can be calculated and from these values, the work …
Bond Abrasion Index Tester
A,. The total power used in rotation is noted. The abrasion index thus determined is included in Table 3.5 for selected minerals. 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 ...
A new approach to the calculation of bond work index for …
The Bond work index (BWI) is a well-known method used when selecting comminution equipment, to evaluate the grinding efficiency and to calculate the required grinding power. ... provided an abbreviated method for determining the BWI consisting of two tests. The first test was performed with only one grinding experiment and the second …
Impact Crusher Working Principle
A new testing procedure for studying crushing phenomena, presently being perfected by Allis-Chalmers, is described for the first time. ... The Work Index for rod and ball mills can be determined from …
Bond Work Index Tests | GSL
The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. The test determines the impact energy at …