The reduction ratio R in rod mills varies from 2 and 20 depending on the characteristics of the ore The usual reduction ratio is about 8 According to Bond 4 the reduction ratio is a function of length and diameter of the mill The optimum reduction ratio R RO can be written as How To Calculate …

Get PriceA ball mill is a type of grinder used to grind or blend materials for use in mineral dressing processes, paints, pyrotechnics, ceramics, and selective laser works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near the top of the shell. A ball mill consists of a hollow cylindrical shell rotating about its axis. T

Get PriceThe maximum power draw in ball mill is when ball bed is 3540 % by volume in whole empty mill volume. Considering that ball bed has a porosity of 40 %, the actual ball volume is considered to be ...

Get PriceBALL MIL. Inputs. Ball mill G/G No. of teeth Pinion No. of teeth Ball mill RPM on Main Drive Ball mill RPM on Aux. Drive Main Motor Speed, RPM Aux. Motor Speed, RPM No. of Main Motor Main Motor kW of each Motor. 172 21 990 1450 1 850. Calculation. Main Motor Total Power, kW Girth Gear / Pinion Teeth ratio Reduction ratio of Main G/B Reduction ratio of Main G/B Round off

Get PriceArchive of SID. calculations, the reduction ratios of rod and ball mills were and , which show high ... the ball mill is increased and therefore its reduction ratio is higher.

Get Price A) Total Apparent Volumetric Charge Filling – including balls and excess slurry on top of the ball charge, plus the interstitial voids in between the balls – expressed as a percentage of the net internal mill volume (inside liners). 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 ...

Get PricePlanetary ball mills 9 . Vibration Mills 10 . Mixer Mill MM 400 11 Feed material: hard, mediumhard, soft, brittle, elastic, fibrous Material feed size: ≤ 8 mm Final fineness: ~ 5 µm Setting of vibrational frequency: digital, 3 30 Hz (180 1800 min1)

Get Priceif the material has rod and ball mill laboratory work indices as low as 10 kWh/t and a reduction ratio as high as 30. Actual cases are, the initial nine 18 ft ID × 21 ft EGL overﬂ ow ball mills installed at Bougainville in 1969. An unpublished survey by Rowland (1975) and inef ciency values calculated ﬁ

Get PriceFriction reduction ratio is the function of the average velocity of fracturing fluid, the gelled agent concentration, and the proppant concentration. Based on the linear regression of 1049 experimental and field data, Lord et al. put forward the following empirical formula to calculate the friction reduction ratio of HPG fracturing fluid (Lord, 1987):

Get Pricecalculate the reduction ratio of ball mill. This indicates that the rod mill reduction ratio is much larger than those at normal condition, and ball mill reduction ratio is much smaller more detailed standard number of reduction ratio of grinding mill where rro optimum reduction ratio for the mill size long and tedious and requires a standard set of grinding

Get PriceReduction Ratio: 20:1 sampai 200:1 BallMill dapat dioperasikan pada keadaan kering (dry milling) maupun basah (wettmilling). Operasi pada keadaan basah dapat meningkatkan kapasitas maupun efisien mill. Ruang dalam ball mill (the chamber) kadangkadang disekatsekat (dengan dekat yang berlubang/grate), dan masing masing ruang/subkompartemen ...

Get PriceL/D ratio Mill drive 5000 kW Diaphragm Double blind plate ... • Empty heights of both the chambers measured to calculate the ball charge, % filling and estimate the power ... − More finer material at the mill inlet − Size reduction rate for 90 microns is poor − No significant grinding in the first 3 meters

Get PriceSep 01, 2013· As the size reduction ratio increases, the optimum ball ratio moves towards more small balls. At the finest grinding with a size reduction ratio of 128:1 (Fig. 7d), a mm/ mm ball mix at a 13:87 ratio was found to be the optimum mix. This indicates that the finer the product size, the higher the proportion of smaller balls that is required.

Get PriceThe design of a ball mill can vary significantly depending on the size, the equipment used to load the starting material (feeders), and the system for discharging the output product. The size of a mill is usually characterized by the ratio “length to diameter” and this ratio most frequently varies from to The

Get PriceReduction ratio is the ratio of the initial particle size to final ... running the mill empty. Calculate the power consumption if 12 tonnes/h of this product is further crushed to 5 x 10 (4) m size in the same mill? ... Ball Mill; Pebble Mill c. Tube Mills; Compartment Mills

Get PriceBall Mill: The equipment to be used for size reduction is ball mill. The ball mill is kind of grinder used for intermediate or fine grinding. Ball mill is a metal cylinder which rotates about its horizontal axis. The coarse material charged along with the metal balls breaks to fine powder by impact of metal balls. 1

Get PriceA Ball Mill Critical Speed (actually ball, rod, AG or SAG) is the speed at which the centrifugal forces equal gravitational forces at the mill shell’s inside surface and no balls will fall from its position onto the shell. The imagery below helps explain what goes on inside a mill as speed varies. Use our online formula The mill speed is typically defined as the percent of the Theoretical ...

Get Priceballs which exist in mill, 𝐴𝑏: each ball abrasion (g), 𝐴t: total ball abrasion in the mill (g), 𝑣b: each ball volume (m3), 𝑓b: supposed ball filling percentage, A r: ball abrasion rate in the mill. If above calculation were done again for 𝑓b = 2%, total ball abrasion will get , finally.

Get PriceFor overflow ball mills, the charge should not exceed 45% of the mill volume . For grate discharge mills, the charge should occupy about 50% of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, ,

Get Pricecalculate the reduction ratio of ball mill calculate the reduction ratio of ball mill river gold calculate ball charge ball mill is one of the most commonly used dry mortarhighway constructionhydraulic production of industrial smash of Get Price And Support Online What it is the optimun speed for a.

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