Ball Mill. Group No. 3. LOGO Contents. Introduction Types and Process. Principle of work. Description of Ball mill Design and Cost Introduction. It is a device used for size reduction, It can reduce sizes up to a tenth of a micron. Cylindrical in shape. Rotates on a horizontal axis. Partially filled with the material to be ground and the grinding medium.
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the ball mill test, the test can also be closed with various sieve sizes, but for AG/SAG mill analyses the standard 14mesh ( mm) sieve is typically used. The rod mill work index is computed with an equation very similar to that of the ball mill test, as follows: The rod mill work index is also normally distributed. The database average and ...
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Principle of Ball Mill: The size reduction in the ball mill is a result of fragmentation mechanisms (impact and attrition) as the balls drop from near the top of the shell. Mixing of feed is achieved by the high energy impact of balls. The energy levels of balls are as high as 12 times the gravitational acceleration.
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Work index is the relation between the SEC and the amount of breakage in an ore. The most common form of this relationship is given as Equation 1, and is often referred to as "Bond's equation" or "Bond's law." E=10× √P − √ F 80 80 ) ( 1 ) Where: E is the specific energy consumption in kWh/t
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It is a wellknown fact that the value of the Bond work index (wi) for a given ore varies along with the grinding size. 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 (ball mills). The relationship between wi and grinding size did not show a clear ...
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2. Mechanism of Size Reduction: Cutting here the material is cut by means of a sharp blade or blades. EX: Cutter mill Compression in this method, the material is crushed between the rollers by application of pressure. Ex: Roller mill Impact impact occurs when the material is more or less stationary and is hit by an object moving at high speed or when the moving particle strikes a ...
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The Bond work index most commonly referred to is the BBM work index. This value is obtained in a 12" 12" laboratory mill running at 70 rpm, with rounded inner edges and without lifters. The grinding charge is comprised of a distribution of steel balls with several diameters. Table1shows the original Bond proposal [13], while the last Bond
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Wi Work index . Gross energy requirement in kilowatthour per tonne of feed needed to reduce a very large feed to such a size that 80% of the product passes through a 100 micro meter screen ... Ball mill Cylindrical or conical shell slowly rotating about a horizontal axis.
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The Bond ball mill grindability test is one of the most common metrics used in the mining industry for ore hardness measurements. The test is an important part of the Bond work index methodology ...
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: 60% cylinder filled with material. Remaining balls are introduced to cylinder. And closed it with lid. Mills are allowed to rotate on axis. Speed of rotation play important role. At low speed, balls roll over each other and size reduction not occur at optimum level. At high speed, ball will stick to the wall of cylinder and no size reduction occur. At correct speed (optimum speed ...
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Here are ten ways to improve the grinding efficiency of ball mill. 1. Change the original grindability. The complexity of grindability is determined by ore hardness, toughness, dissociation and ...
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They extend to almost the full length of the shell and occupy about 35% of the shell volume. In such mills, attrition forces predominate but impacts also play a part in size reduction. They are classed as intermediate grinders and are more useful than ball mills for milling sticky materials. Selection Criteria for Sizereduction Equipment
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In conclusion, understanding the different parts of a ball mill and how they work together is crucial for efficient operation and maintenance. The cylindrical shell, grinding media, and material being ground all play important roles in the performance of a ball mill. ... Liquid Oral Preparations PPT PDF: Solutions, Syrups, Elixirs, Emulsions ...
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1 of 6 BALL Mar 25, 2022 • 0 likes • 822 views Download Now Download to read offline Education Topic: Pharmaceutical Engineering Department: Pharmacy A AmareshManna Follow Recommended Ball mill DEBOLINA SAHA views • 14 slides Ball mill Naveen Choudhary views • 13 slides Size reduction (Communition) BikashAdhikari26
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Calculate a Mill's Operating Work Index. 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 data necessary for its application is not yet available ...
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Hammer mill and Ball mill by . ... 17 rubber compounding ppt kiran by Naveen Choudhary. ... Bond's work index is the work required to reduce unit weight from a theoretical infinite size to 80% passing 100µm. 2. This theory is useful for rough mill sizing. 3. The work index is useful for comparing efficiency of milling operations
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The work index equation for a ball mill test was generated by Fred Bond to empirically predict the operating work index of an industrial ball mill (8 ft dia by 8 ft effective grinding length ...
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The work index (Wi) is calculated in a laboratoryscale ball mill with Bond equation. The Bond work index has been widely used in designing fullscale mills but the Bond test is rather complex, lengthy susceptible to procedural errors and this is why attempts have been made to abbreviate and simplify Bond test procedure (Weiss, 1985).
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Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Scribd is the world's largest social reading and publishing site. Open navigation menu.
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BOND BALL MILL GRINDABILITY TEST The Bond Ball Mill Grindability Test is performed according the original Bond procedure. It requires 10 kg of minus 6mesh material that is preferably prepared at the testing facility. The Bond Ball Mill Work Index has been widely used for ball mill sizing, and is also utilized in computer simulation.
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The P 80 of a ball mill work index test can be estimated if the P 100 is know based on this equation: Estimate grams per revolution when only P100 is known. NI43101 reports often provide P 100 and the work index. To estimate the other parameters, you can assume:
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Converting ball mills and kilns is simple using LE's proven, effective and safe procedure that provides no interruption in production or operation. Lubrication Engineers can help put together a lubrication reliability program for your open gear applications to help them last longer, eliminating downtime and reducing maintenance costs.
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This Grindability Test or Bond Ball Mill Work Index Procedure is used to determine the Bond Work Index of minus six mesh or finer feed ore samples. These equation application methods are used to process <1/2″ ore samples in a Ball Mill using a standard ball charge.
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A ball mill, a type of grinder, is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials and paints. Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium.
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Table (): Bond's work index for some materials Material Work index Bauxite Cement clinker Clay Coal Granite Gravel ... b Ball mills, Tube mills and Rod mills. c Roller mills and bowl mills d Attrition mills 3Ultrafine grinders:
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CERAMIC LINED BALL MILL. Ball Mills can be supplied with either ceramic or rubber linings for wet or dry grinding, for continuous or batch type operation, in sizes from 15″ x 21″ to 8′ x 12′. High density ceramic linings of uniform hardness male possible thinner linings and greater and more effective grinding volume.
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A mineral of was crushed and the average product size of the largest fraction was mm. It was fed to a wet overflow ball mill of m and ground in closed circuit at 75% of the critical speed. The work index of the mineral was kWh/t. Estimate the largest size of makeup ball that should be used. Solution
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For any circuit, whether a crushing circuit, a rod mill, or a closed ball mill circuit, the Work Index always means the equivalent amount of energy to reduce one ton of the ore from a very large size to 100 um. The sample was received crushed appropriately for the ball mill test.
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22 May, 2019. The ball mill consists of a metal cylinder and a ball. The working principle is that when the cylinder is rotated, the grinding body (ball) and the object to be polished (material) installed in the cylinder are rotated by the cylinder under the action of friction and centrifugal force. At a certain height, it will automatically ...
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Ball mill Download as a PDF or view online for free. Submit Search. Upload. Ball mill. Report. Share. W. winnermac1. Follow • 0 likes • 575 ...
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Ball tube Bowl Hammer mill Ball race mill millDominating Attrition Crushing Impactprinciple; 11. .... Best ppt on Presentation on Coal handling plant. Why is the Bond Ball Mill Grindability Test done the way it is done? Mill Work Index which expresses the resistance of a material to ball milling. This Index is ...
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Applicable reasonably in conventional ball mill and rod mill grinding ( holds good for 5 cm 50 µ ). The power input is computed from Bond work index, feed and product particle sizes by W = ( 10 Wi / 10 Wi / ) (9c) W = power input ; Wi = work index ; F = 80% passing size of feed ; P = 80% passing size of product .
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Wm = Wi ( 80P 10 80F 10 ) (1) where: Wm is mill specific motor output power (kWh/t), Wi is the Bond ball mill work index (kWh/t), P80 is sieve size passing 80% of the mill product (µm), F80 is sieve size passing 80% of the mill feed (µm), The "efficiency factors" (Rowland, 1975) modify equation 1 so that it caters for 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 maximum a...
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