1. A grindability measurement made in a laboratory work index apparatus, such as a ball mill work index (WiBM) or a rod mill work index (WiRM) 3. An operating work index (WiO): A measurement of a specific energy consumption and size reduction in an …
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The results showed that using the non-standard mills (between 20 and 35 cm in diameter), the Bond´s model constants (α=0.23; β= 0.82, and γ = 44.5), are unable to predict the Work Index ...
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maka W = 19,5 x 10 x (1/ (500^0,5) - 1/ (150.000)^0,5) didapat W = 8,22 kwh/ton. Untuk pabrik berkapasitas 400 ton/ jam, maka kapasitas motor Mill yang harus dipasang adalah. 400 ton/jam x 8,22 kwh/ton = 3288 kW. Operation Work Index. Apa itu Operation Work Index (Wi) ? adalah suatu angka yang menunjukkan karakteristik …
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The outcome of these tests provides Standard Circuit Bond Work Index (WiSTD) values of the ore for crushing (WiC), rod milling (WiRM) and ball milling (WiBM). The W values calculated through this process can be totaled for the subsequent stages of crushing, …
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The operating work index was also calculated for all available full scale mill data and is shown in Figure 16. There is no design data included in this but it should serve as a guide as to what the mills are actually capable of. Recent regrinding designs falling in the lower area of the graph have significantly under quoted actual operating mills.
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B) Overflow Discharge Mills operating at low ball fillings – slurry may accumulate on top of the ball charge; causing, the Total Charge Filling Level to be higher than the Ball Filling Level. Grate Discharge mills will not face this issue. C) This value represents the Volumetric Fractional Filling of the Voids in between the balls by the ...
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Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond's work you can estimate the energy used into your grinding circuit. This is the most accurate and informative method, but much of the …
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DOI: 10.25018/0236-1493--130-145. Comparative assessment of the Bond Ball Mill Work Index tests. L.S. Chitalov, V.V. Lvov. 1 Saint-Petersburg Mining University, Saint-Petersburg, Russia, e ...
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1. Rod-Ball Mill Circuit (Single-Stage Ball Mill, Multi-Stage Ball Mill, or High Pressure Grinding Roll-Ball Mill) 8.56 WioACT= ––––––––––––––––––––= 11.8 kWh/t 10 10 (––––––－–––––––––) √￣￣1￣￣55￣ √￣16,000￣￣ • Bond Standard Circuit: (
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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 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 ...
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Ball Mill Power Calculation Example #1. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80% passing ¼ inch (6350 microns). The required product size distribution is to be 80% passing 100 mesh (149 microns).
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Bond Work Index Ball Mill Design And Safety Factors. Bond Work Index Ball Mill Design And Safety Factors. Ball mill grindability the test mesh used was 100 mesh p 1416 the bond work index w i was calculated from equation 2 w i 445p 1 023 x gbp 082 10p 80 05 05 10f 80 2 where f 80 is the size in m at which 80 percent of the new feed to ball mill …
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Operating Efficiency: compares the operating work index, calculated from production comminution machinery operating data, to the Bond Work Index from bench scale comminution tests or calculated from pilot plant operating data. Economic …
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This will give the 250% circulating load. The Bond test takes 7-10 cycles. The test-sieve under size from the last grinding cycle is analyzed by screening. To calculate the work index (Wi) in a laboratory-scale ball mill, Bond first derived the equation: 16 P …
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A standard Bond mill (Fig. 1) was designed to perform the work index tests and determine the energy consumption of various s minerals.The mill has a round internal housing at the corners, has no lifters, and is for dry grinding. The inner diameter and the length are 0.305 m, and the ball load is 19.4% of mill volume (equaling a total weight of …
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you cannot use work index analysis for the same purpose on ball mill circuits because of the complex interactions between grinding and classification. In this module, you will learn how to relate design and operating variables to ball mill circuit efficiency through …
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The Wellington Apartments. Welcome home to The Wellington Apartments An inviting community situated in the convenient Clays Mill area We are only minutes from the Fayette Mall Stonewall .Ball Mill Operatng Work Index Effeciency. Bond Ball Mill Work Index BWi kWht 13.4 Bond Rod Mill Work Index RWi kWht 18.1 Table 1.
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What the SAGMILLING software does (Bond Wi version) The laboratory ball mill work index result is read from the database (P 80, P 100, F 80, and gpr; if multiple results exist with a particular sample …
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In the prerequisite module entitled "Work Index Efficiency", you have learned about work index analysis* to define overall grinding circuit efficiency. In rod milling, you can use work index analysis to relate design and operating variables to overall circuit efficiency. However, you cannot use work index analysis for the same purpose on ball mill
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Ball Mill Operatng Work Index Effeciency. by mill operating parameters It is hoped that this work can be used as a precursor to the development of a model that can predict liberation given the various ranges of operating parameters Mill speed mill charge ball size and wet grinding are the parameters which have been selected for the present …
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Results of Bond ball mill tests conducted with closing screens of 75 μm or finer are to be treated with caution. The Bond Work Index relationship has been noted to apply down to approximately 70 μm, and perhaps no finer, without making qualifications.
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Crushed ore is fed to the ball mill through the inlet; a scoop (small screw conveyor) ensures the feed is constant. For both wet and dry ball mills, the ball mill is charged to approximately 33% with balls (range 30-45%). Pulp (crushed ore and water) fills another 15% of the drum's volume so that the total volume of the drum is 50% charged.
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The Work Index is used when determining the size of the mill and grinding power required to produce the required ore throughput in a ball mill. 2. Procedure 2.1. Bond Ball Mill Grindability The sample was crushed to passing 6 mesh (3.35mm), from this a 700 cc volume was measured and weighed to be used as feed for the Bond Mill.
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The self-grinding work index is an extension of the concept of Bond work index. It generally refers to the work index calculated by using Bond's fracture theory on the principle of ore crushing energy consumption according to the W, F, and P data of a small or semi-industrial or industrial self-grinding test. In this kind of test, McPherson …
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How To Calculate Crusher Work Index . Crusher operating work index calculation sizing a crusher can be done reliably calculated thanks to the impactcrushing work index and the testwork research done by fred chester bond and his 1952 according to bonds third theory of comminution the workenergy input is proportional to the new crack tip length created …
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sbm/sbm ball mill operatng work index calculation.md -rw-r--r-- 24.3 KiB . View; Log; Blame; View raw; Permalink; c1849ea5 — dihog VII 4 months ago
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In the standard A-C closed circuit ball mill grindability test the work index is found from. where Pi is the opening in microns of the sieve mesh tested, and Gbp is the net grams of mesh undersize …
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Rowland, C.A., 1978, "Determination and use of operating work indices in controlled grinding circuits–A proposed concept," Mill Operator's Conference and Exhibit, Northwestern Branch, Australasian Institution of Mining and Metallurgy, Mt. Isa, …
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A typical copper porphyry treated by HPGR will see a 0% to 10% reduction in ball mill operating work index versus the Bond ball mill work index test; a typical copper porphyry treated by a SAG ...
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The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency: a) Mill Geometry and Speed – Bond (1954) observed grinding efficiency to be a function of ball mill diameter, and established empirical relationships for recommended media size and mill speed …
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This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table. Source 1. Source 2. Source 3. Source 3. Source 4.
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Bond work index type as per ASTM. Power. 1 Hp 3 Phase. MECHMIN engineered Ball Mill consists of a cylindrical shell with Curved end flanges Welded to the shell.. Mill is supported on 2 nos. Double Row Spherical Roller Bearings by 2 nos. shafts welded to the end flanges and stiffened with gussets. The above assembly is placed on Cast Iron ...
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