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13. Limestone. 16. Gold Ores. The kilowatt-hours per tone (kWh/t) will work out your work index. The number of kittowatts consumed in a hour divided by the tonnes of rock gives you your work index. Remember, the higher the Work Index the more work required to crush the rock. This will impact the equipment chosen for your project.
A method of grinding a mineral-containing ore, which includes grinding the mineral-containing ore in a primary milling process and thereafter fine grinding the mineral-containing ore in a secondary ball-mill. A composite grinding medium comprising a mixture of steel balls and pebbles is used in the secondary ball-mill. The pebbles have an average size which is …
The Work Index is a fitted ... sure that you have actually measured the feed & product sizes and applied Bond's equation before you go claiming that a grinding circuit has an operating work index.
Limestone grinding machine, limestone mill,Limestone grinding … Machinery is a high technology enterprise of Shanghai city .It is a professional manufacturer of industrial grinder Mills,such as ball grinder Mill,raymond …
To measure grindability, Bond developed 'Bond's Work Index' (BWI), a 'test mill' and a testing procedure for WI. With the help of this we can work out power required to grind a material from a given feed size to a product of given fineness. Other index known as 'Hardgrove Index" is also used to scale grindability of materials, particularly coal.
Work index results show that all samples falls under the cate- gory of HARD ROCK except Face-4A (W i<20kwh/t). Limes- tone of Face-4A is MEDIUM HARD ROCK among all samples. . This clears that work index as wellas power consumption increases with the hardness of material.
BOND WORK INDEX BOND WORK INDEX MATERIAL DRY GRINDING kWh/t Bauxite 14 Cement clinker 19 Cement raw material 15 Clay 10 Clay calcined 11 Coal 16 Dolomite 16 Gypsum rock 12 Limestone for cement 15 Magnesite dead burned 24 Sandstone 17 Slag 23 Slag-iron blast furnace 17
Ball Mill Bond Work Index For Limestone; Advances in Fine Grinding & Mill System Application in the … recirculation load for an attrition ball mill processing limestone with a bond work index of 10 and a feed particle size of 1/4" x 0" is between 140 to 150%.
hargrove grindability index for rocks – Grinding Mill China. Alternative Approaches for Determination of Bond Work Index on … 3.3 Hardgrove Index The hard grove process was developed in the US for the grindability test of …
WI Bond test Work Index, kWh/short ton. SG Ore specific gravity. Cs Mill speed in percent of critical. ID Mill inside (liners, working) diameter, feet. It pre-dated (semi-)autogenous grinding, and needs to be adjusted for those applications. Other guides (e.g. Azzaroni, 1981) provide different results. These serve
Ball Mill Bond Work Index for Limestone – Ore Beneficiation Plant. The Bond Work Index indicates a relative grindability of the limestone.The Work Index number is developed by grinding a small sample of the material in a … »More detailed
for the Bond work index approximate value determination, which is based on the first order grinding kinetics, is presented in this paper. Comparative experiments for the Bond work index value determination using the standard and quick procedures were …
For P80s finer than 75 μm, the Levin test, a modified Bond ball mill work index test, may be used to predict grinding performance. Signature Plots. No general work index formula governing energy use over a range of conditions, like the Bond equation for intermediate grinding, has yet been found for the fine grinding regime.
The work piece is raised fractionally for the next grinding pass. The work bed will also move in and out, which allows a complete and even grinding of the workpiece. When surface grinding, you need to understand the relationship between the grinding wheel, and the material of the workpiece. Cast Iron and most Steels, tend to grind perfectly well.
EF5BM= P80 103 1145 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 10 000 181 m from Table 1 and the P80 is the ball mill circuit product The EF5 factor only applies below 75 181 m to ball...
The energy required for crushing and grinding is presented by the Bond work index and is determined by means of Bond grindability test. This paper presents the experimental results of the Bond work index values obtained by the standard method on limestone and andesite samples, as well as composite samples… Expand View via Publisher
Determination of the Bond Work Index of Ores A.J.C.Taguiam Department of Mining, Metallurgical and Materials Engineering University of the Philippines, Diliman [email protected] Abstract The Bond work index refers to the measure of a material's hardness or resistance to crushing and grinding, and is numerically expressed as kilowatt hours per short ton.
325 Mesh Limestone Grinding Mill Equipment. 325 Mesh Limestone Grinding Mill Equipment To grind these non metallic ores such as limestone the special grinding mill equipment not only realizes environmentally friendly production but also has high efficiency large powder extraction rate and excellent particle size It is a special equipment for many new and old customers and …
, 2 and 3 show the grinding product composition changes during the Bond's grinding tests performance using the test sieves 74, 105 and 150 microns on …
Ball mill work index sand limestone. ball mill bond work indeand for limestone. ball mill work index sand limestone grinding media ball mill wikipedia the ball mill is a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass ...
Ball Mill Bond Work Index for Limestone – Ore Beneficiation Plant. The Bond Work Index indicates a relative grindability of the limestone.The Work Index number is developed by grinding a small sample of the material in a … »More …
Chemical analyses and thin section petrographic analyses were used to characterize the limestone samples. The results of the laboratory ball mill test were compared to the results of an industrial grinding test, the Bond Work Index, for six …
qm 3 ball mill for measuring grinding work index operation. 100tph vertical roller pre grinding mill work index of attrition ball mill 80100tph stone qm 3 ball mill for measuring grinding work index and qm 3 ball grinding machine for peru 6080 tph chat online 100 tph cement ball mill ic4uin mobile primary jaw. Details; Bond rod mill asindex test.
The second test, a Bond Work Index determination, results in a specific energy value (net Hp-hr/t) from an empirical formula. If time permits and the user wishes, grinding circuits are set up and continuous tests are run to simulate plant operation.
The Bond work index of limestone and andesite mixtures. This paper investigates grinding of mineral mixtures with different grindabilities in the Bond ball mill. Understanding the ore mixture grinding is of great importance in mineral processing. The energy required for crushing and grinding is presented by the Bond work index and is determined ...
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 …
where W is the work input required in kilowatt hours per short ton to grind from 80% passing F microns to 80% passing P microns, and Wi is the work index, or the grinding resistance parameter. It represents the energy input required in kilowatt hours to reduce a short ton from theoretically infinite feed size to 80% passing 100 microns.
, 2 and 3 show the grinding product composition changes during the Bond's grinding tests performance using the test sieves 74, 105 and 150 microns on …
What is the power required to crush 100 ton/h of limestone if 80% of the feed pass a 2-in screen and 80% of the product a 1/8 in screen? Solution: The work index for limestone is 12.74. kW P D mm D mm m pb pa 169.6) 50.8 1 3.175 1 100 * 0.3162 *12.74(The power required is : 0.125 * 25.4 3.175 2 * 25.4 50.8 100 ton/h P m. 0.3162W i 1 D pb 1 D pa ...
On the other hand, the microwave pretreatment increased the grinding energy of studied sample S2 by 13.66% (0.81 kWh/ton), 15.59% (0.93 kWh/ton), and 19.06% (1.13 kWh/ton) at 2, 4 and 6 min, respectively. Table 4. Test repeatability of the Bond work index for untreated samples S1 and S2.