EF5BM=[ P80+10.3 1.145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a "single-stage ball mill" calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 µm to ball
Bond Standard Circuit Work Index: Assume the rod mill Work Index of 9.5 applies from the actual rod mill feed sizeof 19,300 mµ (although some of this work might ideally be done by crushers to achieve a rod mill F80 of 16,000 m) to a rod µ mill (circuit) product size of 1,000 µm. W Total = 2.32 + 4.77 = 7.09 very large size (FkWh/t of . 9.70 ...
bond s rod mill for work index As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including quarry, aggregate, and different kinds of minerals.
The Bond rod mill work index is not as common as the Bond ball mill work index, and there are two different variations on the mill apparatus.The SAGMILLING models expect a mill with a "wave liner", and is not compatible with mills using "smooth liners".
To calculate Bond rod-mill work indices, the four samples were screened and the particle size distributions plotted in Fig. 2.The plot was used to find F 80 of the samples for calculations. Fig. 3, Fig. 4 show the grinding kinetics of Pb, Cu, Fe, and Mn ores in the Bond rod-mill in different test-sieves. The slopes of all lines in the figures are equal to the k value of Eq.
The Bond rod mill work index (Wi RM, or RWi) conducted from a feed size of approximately 10 mm to a product size on the order of 1 mm. The Bond crushing (impact) work index (Wi C, CWi, LEIT or IWi) conducted on specimens of a nominal dimension between 50 mm and 75 mm. The product size is not relevant to this test; it is a determination of the ...
In this study, a variability bysis is carried out with the Bond standard grindability tests on different critical metal ores (W, Ta), ranging from coarse grinding (rod mills) to fine grinding ...
In this paper, systematic errors encountered in a rod mill Bond Work Index determination related to the weight and size distribution of the sample are first estimated experimentally. The first type is shown to be relatively small, whereas the second can be as high as 3 kWh/t when the feed size F 80 is finer than 3.0 mm.
Bond rod mill work index, RW i • –5 mm • Bond ball mill work index, BW i. The correlation between coarse particle comminution parameters tends to be rather poor as testing hardness of coarse particles tends to be dominated by breakage through fractures and fissures in the rock rather than through the rock itself.
Source 1: Table of materials reported by Fred Bond Source 2: Outokumpu, The science of comminution Source 3: Equipment and pipelines Source 4: Tenova Bateman mills (AG/SAG, Rod, Ball Mills) Source 5: Doering international Source 6: SME handbook of mineral processing, N.L Weiss Editor, NY 1985. Bond Work Index Tester
Bond's approach consists of determining the ore hardness characteristics, or Work Index (Wi) via standardized laboratory testwork. The full suite of Bond comminution tests provide the Ball Mill Work Index (BWi), the Rod Mill Work Index (RWi), the Crusher Work Index (CWi) and the Abrasion Index (Ai).
The rod mill work index laboratory test is conducted by grinding an ore sample prepared to 80% passing 12.7 mm (½ inch, the original test being developed in imperial units) to a product size of approximately 1 mm (in the original and still the standard, 14 mesh; see Chapter 4 for definition of mesh), thus determining the rod mill work index ...
3.4.7. Bond rod mill standard testStandard conditions for determining the work index of rod mills under laboratory conditions are: mill size = 305 mm (internal diameter) × 610 mm (internal length) with wave type lining. material dry mineral. quantity − 1250 cm 3 (tapped down to give a reproducible bulk density)
Bond quantified the rod mill power draw as a function of the Work Index, capacity, and a series of correction factors: P M = W mtest,i F T Q F T = F 1 F 2 F 3 F 4 F 5 F 6
determination of Bond rod-mill work index by. Jan 01, 2013 The Bond rod-mill work index is used in conjunction with Bond's third theory of comminution to merely calculate net energy requirements for sizing rod-mills. This test was originally developed in the …
The Bond rod-mill work index is used in conjunction with Bond's third theory of comminution to merely calculate net energy requirements for sizing rod-mills. This test was originally developed in the mid 1930s by F.C. Bond. Though, it was altered in succeeding years, it has essentially remained unchanged since 1961 [1].
The specification for the apparatus to determining a "Bond" rod mill work index is first described in Bond & Maxton (1943). It states that the …
The Bond rod mill grindability test is a widely used tool to estimate the response of ores to rod milling. However, the mass of ore required to conduct the test, which can typically vary from ...
Bond Rod Mill Work Index Equipment Apparatus Review. Commentary on the apparatus of the Bond rod mill Work Index by Alex Doll December, 2015 [email protected] The Bond "Third Theory" of comminution was originally divided into three size classes reflecting the varieties of comminution equipment common during the time period when Bond (and his …
Bond Rod Mill Work Index Equipment Apparatus Commentary on the apparatus of the Bond rod mill Work Index by Alex Doll December, 2015 alex.doll@sagmilling T
3.4.7 Bond rod mill standard test Standard conditions for determining the work index of rod mills under laboratory conditions are: mill size = 305 mm (internal diameter) × 610 mm (internal length) with wave type lining material dry mineral size − reduced to < 13,200 μm quantity − 1250 cm 3 (tapped down to give a reproducible bulk density)
The Bond rod-mill work indices of different samples with various test-sieves by standard Bond, Chongbo and Bingchen, and shortened method. R. Ahmadi et al. Advanced Powder Technology 24 2013 441445. 445. 0.5463 and 0.1013 and same conclusion applies for the 99 condence level with the related values.
Rod mill as first stage and ball mill sizing with the Bond method. for rod mills ball . The Influence of Ball Mill Critical Speed on Production Efficiency. . C 200 for ball mills and 300 for rod mills. Wi Work index. Vcr percentage of the critical speed. Sgs specific gravity of . …
A New Approach to the Calculation of Work Index and the. The work index Wi was defined by F Bond as the specific energy (kWh/ton) required to reduce a particulate material from, tory rod mill and the semi continuous process using the, for …
* 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 standard Bond Rod Mill Work Index test procedure is firstly to stage crush the feed to pass 12.7 mm, and size a representative sample. The test then involves a series of batch grinds in a standard Bond rod mill. A Bond rod mill is 0.305m by 0.610m, with wave liners (of a form described by Bond), which runs at 40rpm and tilts as described ...
Bond Rod Mill Grindability Test. Grinding Solutions 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 from 4.75mm to 212µm. Abrasion Index Test
Abstract Generally, Bond work index is a common method for selecting comminution equipment as well as estimation of grinding efficiency and calculating required power. In the current research, a simple, fast and accurate procedure is introduced to find the rod-mill work index based on the conventional Bond work index. The grinding experiments were carried out on four typical …
Rod mill work index is used in the SAGMILLING Bond/Barratt specific energy consumption model . The work index is used to calculate the energy requirement to grind rocks in the medium size range, from 10 mm - 20 mm down to about 2 mm. Categories: Testwork Bond work index
Definitions containing 's rod, his chief work is "'s Rod Blossoming," a vigorous statement and, bow, &c: a bond: something for tying .Tumbling mills for size reduction with either steel rods (rod mills, According to Kick's law, the energy required for comminution is, is the Bond work index Wi .NHF Work it Out Challenge, -09-24