Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond's Third Theory of Comminution, the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent to the work represented by the product – the feed.

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.

Thus, the test work index value multiplied by the product of the correction factors will provide an estimate of the true (plant) work index value. (3.42) W i = W i TEST × F 1 × F 2 × ⋯ × F 7 × F 8. Factors for condition not applicable should be taken as 1. The Bond work index value changes with the sieve size chosen during a particular test.

A quick method for bond work index approximate value determination 323 This method, by using mathematical algorithms, simulates the Bond test on the basis of the results from the first two milling cycles. Magdalinovic (1989) proposed a shortened method for determining the Bond work index, which includes two milling.

A New Approach to the Calculation of Work Index and the Potential Energy of a Particulate Material Elias Stamboliadis, Stamatis Emmanouilidis, Evangelos Petrakis ... 80. ones. The constant ... tests which is similar to the Bond test but with the exist- ing mill of known power.

The Bond Abrasion Test determines the Abrasion Index, which is used to determine steel media and liner wear in crushers, rod mills, and ball mills. Bond developed the following correlations based on the wear rate in pounds of metal wear/kWh of energy used in the comminution process.

EFFECT OF CORE DIAMETER ON THE BOND IMPACT CRUSHING WORK INDEX TEST ABSTRACT The Bond low energy impact (crushing) work index test is specified to be performed on rock specimens between 50 mm and 75 mm in effective diameter. NQ-diameter drill core, frequently used in

Based on a large number of tests, Bond introduced a working index or comminution parameter that represents the resistance of the material to crushing and grinding. Characterization of rocks for selection of crusher can be done in different ways, and the most commonly used is Bond work index (Tavares and Carvalho 2007).

Each crusher is designed to work with a certain maximum size of raw material, and often delivers its output to a screening machine which sorts and directs the product for further processing. Typically, crushing stages are followed by milling stages if the materials need to be further reduced.

USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE ... the use of JKSimMet. Independent of this it can be used in power-based calculations, which in conjunction with the Bond ball work index test, enable the prediction of the specific energy of comminution circuits ... = ®Crushing ore work index and is provided directly by SMC Test

the crusher is in open circuit, eg pebble crusher in a AG/SAG circuit, K 2 takes the value of 1.19. x 1 = P 80 in microns of the circuit feed x 2 = P 80 in microns of the circuit product M ic = ®Crushing ore work index and is provided directly by SMC Test The coarse ore hardness parameter (S) makes allowance for the decrease in ore hardness

by Hazen Research, Inc. (HRI) to obtain the JK parameters using the JK Drop Weight Test, 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).

occurs. The work input, assuming no change in work index, is .194 kwh/ton. For a mine crushing 50 million tons per year, a reduction of 1.8 million kilowatt-hours, or about $125,000 per year is realized. The second possibility is a decrease in Wi. There is evidence that work index bears a …

bond impact crushing work index test. with the Bond's work index, Hardgrove index and Brittleness tests on six typical .... rock sample of -80+19 mm size fraction was subjected to impact crushing for.specimen (Bond, 1947), and then the crusher work index (CWI) or impact work index …

Bond Work Index Procedure and MethodThis Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or

Figure 1: Uniaxial compression test machine 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 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.

The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial ...

Bond Ball Mill Index Test, JKTech. Measuring ore grindability in balls mills. The Bond Ball Mill Work Index is a measure of the resistance of the material to grinding in a ball mill. Investigation into the applicability of Bond Work Index . Bond Work Index (BWI) Hardgrove Grindability Index (HGI) tests …

* Bond F. C., "Crushing & Grinding Calculations", Reprint from British Chemical Engineering, Allis-Chalmers Publication 07R9235B Bond Low Energy Impact Test 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*.

Orway Mineral Consultants Canada Ltd. Mississauga, ON., L4W 5N5, Canada ... 80 of the product of the last stage of crushing prior to grinding to a P 80 of 750 µm. "Fine" covers the size range from a ... Test data from the Bond ball mill work index test is used to calculate the fine grinding index (M ib). The M

Bond crushing (impact) work index In general, the impact or crushing work indices (CWi) calculated from test work carried out on machines conforming to Bond's Comparison between bond crushing energy and fracture energy of ...

a method using Bond Indices than adding a single factor of 1.25 to arrive at the AG/SAG speciﬁ c energy. In 1991 the Canadians developed the SAGPower Index (SPI), test using 2 kg of material in a 300 mm diameter mill. This test has been further developed by Starkey, Hindstrom and Orser (2006). This test now includes a Bond Ball mill work ...

Determining the Bond work index value is quite complicated, time-consuming and requires trained operating personnel and therefore is subjected to errors. A quick method for the Bond work index approximate value determination, which is based on the first order grinding kinetics, is presented in …

A clear definition of the required crushing capacities and the desired product quality can be precisely determined by using the Bond Index test methods. Using the Bond Index test procedures it is possible to calculate crushing / abrasion behavior of mineral samples. This knowledge is essential to define the required ball mill layout and ...

Bond F C Crushing And Grinding Calculations Bond F C Crushing Grinding Calculations Reprint from British Chemical Engineering Allis-Chalmers Publication 07R9235B Bond Low Energy Impact Test The test determines the Bond Impact Work Index which is used with Bond s Third Theory of Comminution to calculate net power requirements when

or impact stress, as well as the stress intensity and rate, have to be taken into account in the context of ... test work to certain methods, i.e., ... The point load test gives the point load strength index Is50 which needs to be corrected to the standard equivalent core diameter De of 50 mm if …

the SMC Test® can be re-used for Bond ball work index testing, the SMC Test® being effectively used as a feed preparation step for the Bond ball work index test. As a general rule Bond ball work index tests are recommended when SMC Tests® are carried out as this provides valuable additional information on the way that much finer particles break.

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 10 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.

* 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.

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