bond 39 s rod mill for work index

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A Bond rod mill work index test (BRMWI) is a standard test for determining the rod mill work index of an ore sample [21]. The BRMWI is a measure of the resistance of the material to crushing and grinding in a rod mill and is used to calculate the grinding power needed for a given material parcel regarding rod mill grinding conditions.


work index. By running a batch dry-grinding test in a rod mill, an average specific energy of 7.34 kW/STPH was determined using Bond's formula with the reference work index of 11.25 kW/STPH. This specific value is limited to these test conditions:


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Price Of Index Bond Ball Mill. A Bond Ball Mill Work Index May Also Be Used In The Simulation And 3Bs Rod Mill For Work Inde . Bond 26 2339 3Bs Rod Mill For Work Index Bond 39 S Rod Mill Get Prices; The Long Term Stabilization Of Uranium Mill Tailings. The Work. Special Thanks Are Due S. Needham, Australia, Who Under Contract Provided A 39. 5.5.


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.


Comparison of UCS to Bond Work Indices. C for coarse rocks 75 50 mm a rod mill work index Wi RM for intermediate sized particles 25 3 mm and a ball mill work index Wi BM for small particles . 3 mm Ammtec 2000 Laboratory testwork is required to determine these Work Indices and each test requires carefully collected samples of rock that is representative of future mill


Bond ball mill work index C Wi Bond crusher work index D HPGR roll diameter (m) E sp net specific energy consumption (kWh/t) F HPGR hydraulic pressing force (kN) F 80 particle size at which 80% of particles pass in feed F SP 2HPGR specific pressing force (N/mm ) L HPGR roll length (m) ṁ or m-dot HPGR specific throughput constant (ts/hm3)


Chapter 2 Size Reduction 40 Ball Milling – Media Size – an empirical relationship from Kelly and Spotiswood to determine make up media ball diameter (D m ) is as follows: d i = feed particle size (d 80 ) (m) W i = bond work index D M = mill diameter (m) r s, r l, r m = solid, liquid, media dens. N = mill speed (rpm) N c = critical speed ...


Typically R = 8. Rod Mill Charge: Typically 45% of internal volume; 35% – 65% range. Bed porosity typically 40%. Height of bed measured in the same way as ball mills. Bulk density of rods = 6.25 tons/m3. In wet grinding, the solids concentration 1s typically 60% – 75% by mass. A rod in situ and a cutaway of a rod mill interior.


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Commentary on the apparatus of the Bond rod mill Work Index. by Alex Doll December, 2015 [email protected] The Bond "Third Theory" of …


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Bond 39 S Rod Mill For Work Index. Bonds rod mill for work index commentary on the apparatus of the bond rod mill work index 183 rod milling is fitted to a tumbling test referred to as the bond rod mill work index wirm or rwi the apparatus used to determine this work index was described in 1943 by bond amp maxton and a slightly different apparatus was described by bergstrom in 1985.


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


"Bond's Law" On line 2 of the article, the "citation needed" comment is not valid because the Wiki page Comminution calls it "Bond's Law." — Preceding unsigned comment added by Imat6441 (talk • contribs) 19:47, 24 June 2011 (UTC) Wikipedia is NOT a reliable …


The Bond Index conforming rod charge consists of: 6 rods of 1.25" diameter and 21" length. 2 rods of 1.75" diameter and 21" length. The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.


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WORK INDEX •Work Index, Wi, is the gross energy requirement in kilowatt hour per ton of feed (kWh/ton of feed) to reduce a very large particle to such a size that 80% of the product will pass through a 10micrometer, or 0.1 mm screen. •If Dp is in mm, 𝑊𝑖=𝐾 1 𝐷𝑝𝑝 𝐾 = 0.1𝑊𝑖=0.3162𝑊𝑖 I =0.3162𝑊𝑖 1


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Relationships between comminution J energy and product . Table I shows the Bond ball mill work index obtained for the ore samples as well as the iron and silica content in concentrate and tail after LIMS The concentrate weight recovery was in the order of 50–60 Furthermore it may be observed that the Bond ball mill work indices for the ore Wi varies from 14.6 to 20.9 kWh/t.


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The Bond grindability test has been widely used for predictions of ball and rod mill energy requirements and for selection of plant scale comminution equipment [5]. ... The Bond work index is defined as the kilowatt-hours per short ton required ... 1 ¼ 39 13.7 1 60 21.0 7/8 68 23.9


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The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond …


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Wi = The Bond Ball Mill Work index ( 1952 )- is a measure of the resistance of the material to crushing and grinding . 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 …


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