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.
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 …
Currently, the dimensions of the largest Blake-type jaw crusher in use are 1600 mm × 2514 mm with motor ratings of 250–300 kW. Crushers of this size are manufactured by Locomo, () and others. The crusher is the C 200 series having dimensions 1600 mm × 2000 mm driven by 400 kW motors. Table 4.1.
A Bond Ball Mill Work Index test may be required for the design of a new mineral processing plant . It is determined by Bond Ball Mill Grindability test in a lab using a Bond Mill. ... Material from the crushing section - to assess the work done by the crusher and the work to be done by the subsequent grinder. Material from the mill discharge ...
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). Holmes (1957) proposed a modification ...
FIGURE 5: BOND ROD MILL WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS (MPa) 5 10 15 20 25 30 35 WiRM (metric) The lack of fit observed relating the crushing Work Index was expected to carry over to the other Bond Work Indices. Figure 5 displays the plot of rod mill Work Index (Wi RM) versus UCS. These
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*. …
The final form of Bond's equation can be written as [4]: (2) E = 10 C W i 1 P 80 − 1 F 80 kWh ton where C = a tabulated constant depending on type and condition …
Bond Work Indices were also backcalculated from the data using the standard formula, i.e. where F80 is defined as the length of the side of the cube of the same weight as the average particle. …
The final form of Bond's equation can be written as [4]: (2) E = 10 C W i 1 P 80 − 1 F 80 kWh ton where C = a tabulated constant depending on type and condition (wet or dry) of comminution equipment, F 80 = 80% passing sieve size of the feed, μm, P 80 = 80% passing sieve size of the product, μm, W i = Bond work index: the work required to ...
it is pertinent to note that the Bond work index for . granite is 15.83kWhr/ton [30]. ... Jaw crusher machines are used in the mining and construction industry for crushing rocks and mineral ores ...
parameter ta and crusher model energy matrices, the SMC Test ® can be used to conduct AG/SAG mill and crusher circuit simulations through 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
The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index. ... GSL can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range …
The Bond work index (Bond, 1960) ... The gape was 813 mm and the width of hopper 1067 mm. 90% of the ore commenced crushing 200 mm from the bottom of the crusher. The …
WiBM Bond Ball Mill Test Work Index (kWh/t) Wic Bond Impact Crushing Test Work Index (kWh/t) WioACT Actual Operating Bond Work Index determined from measurements on the circuit (kWh/t) WiRM Bond Rod Mill Test Work Index (kWh/t) WiSTD Standard Circuit Bond Work Index (expected or designed) used for circuit design. Specific energy requirement …
Test Procedures for the Characterization of Crusher Performance. The Bond Impact Work Index method has been an industry standard for the determination of crusher power requirements but was …
The Bond Work Indices were 12, 16 and 20 kWh/t. The corresponding min CSS's are 20, 31 and 40 mm. Note that here, it was assumed that a rock with a Work Index according to Bond of 16 kWh/t, translates to a work index about 3.5 kWh/t as defined through Equation 3. Download : Download high-res image (268KB) Download : …
test work. Bond work indices, obtained from bench-scale or pilot plant crushability and grindability tests are used in the fol lowing Bond equation (Bond, 1960) to determine the …
A primary gyratory crusher was required to crush iron ore at the rate of 3000 t/h. The largest size of the run-of-mine ore was 1000 mm. The required product size was less than 162 mm. Manufacturer's data indicated that the nearest size of gyratory crusher would be 1370 mm × 1880 mm with a cone angle of 18°.
Bond's work is notable because of its widespread adoption in the design of most modern industrial grinding circuits. Bond developed a work index function that he suggested was a measure of the crack length needed to break a specific particle size. The theory is that since the surface area function is proportional to the
Rock crusher. Material is reduced by crushers and grinders by fracturing, which takes place when the material is put under stress by the moving parts of the crushing or grinding equipment. ... Bond's Law states that the total work input represented by a given weight of crushed product is inversely proportional to the square root of the ...
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. ... Also given are their breakage characteristics as obtained from an impact crusher. The work indexes of ores were 11.8, 13.2, 12.2 and 12.8 ...
The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and …
Is VSI good choice for circulating load or over sieve product of tertiary (3rd stage) crusher. The ore has p80=18-20 mm, Bond work index Bwi=15-17 kWh/t.? How about the CAPEX and OPEX? Last replied to by Proman The VSI crushes hard and brittle materials with ease. It is the right choice for handling rock, cement clinker, grinding material ...
The kinematics of the single-toggle crusher has been modelled by Oduori et al. (2015). An energy efficiency study was performed by Legendre and Zevenhoven (2014). In their study, energy was estimated with the Bond work index, and an on-line optimization algorithm was used to increase the efficiency of a laboratory crusher.
Although not as popular as the Bond ball mill or the Bond rod mill work indices, the impact work index, also called Bond crushability index, continues to be much used for crusher selection. The ...
The Mod Bond results must be calibrated against sufficient standard Bond ball mill work indices, typically 10% of the total. The Mod Bond test is used for large variability programs because it provides significant savings in terms of costs (less material required and testing time) and turnaround time, without jeopardising the quality of the ...
Gyratory Crushers. The primary rock breaker most commonly used in large plants is the gyratory crusher, of which a typical section is shown in Fig. 5. It consists essentially of a gyrating crushing head (521) working inside a crushing bowl (522) which is …
The crushing work index (CWi), estimated on the basis of the twinpendulum test, has been proposed by Fred Bond and accumulates a long track record in predicting the performance of crushing ...
