Ball Mill Grindability Test was conducted by standard practice using 100mesh (150 pm) closing screens. The ball mill work index is shown below. BM Wi (kWhr/st) = ; ... 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 ...
WhatsApp: +86 18838072829In determining the proper mill size required to meet a targeted production rate, many factors are evaluated including: length to diameter (L/D) ratio, individual compartment lengths, rotational velocity, liner type, ball gradation and percent filling degree. This paper examines the effects of changing mill filling degree with respect to specific power consumption (kWh/ton) and product ...
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WhatsApp: +86 18838072829for size reduction • The energy dE required to effect a small change dL in the size of unit mass of material is a simple power function of the size. • Rittinger's law: putting p = −2, then integration gives: Writing C = KRfc, where fc is the crushing strength of the material, then Rittinger's law, first postulated in 1867, is obtained as: Since the surface of ...
WhatsApp: +86 18838072829A ball mill has a 8 ton capacity, which has 40 kw energy during operation. Feeding materials amount of 80% sieved from 15 mm sieve grinding materials amount of 80%sieved from mm sieve. Fort he same amount of material grinding and finer product, need to amount of 80% sieved Please calculate the ball mill energy acording to new condition.
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WhatsApp: +86 18838072829A motor with around 1400 Horses Capacity is calculated needed for which planned task. Now we much pick an Ball Mill such will draw all power. The round mill motor power requirement calculated above such 1400 HP be the power that must be applied at the mill driver with order into grind the tonnage on feed from one size distribution. To following ...
WhatsApp: +86 18838072829The sizing of ball mills and ball milling circuits from laboratory grinding tests is largely a question of applying empirical equations or factors based on accumulated experience. Different manufacturers use different methods, and it is difficult to check the validity of the sizing estimates when estimates from different sources are widely ...
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WhatsApp: +86 18838072829further reduced in size. Water is added to the ball mill, in which a slurry that usually contains from about 20 to 55 percent solids is produced (Singh, 2010; International Mining, 2011) (see fig. 2). The mill operates in a closed circuit with screens that size the ore and cyclones that sort the ore by size and density.
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WhatsApp: +86 18838072829Hard ore Work Index 16 = 100,000/65,000 = kwh/t. For the purposes of this example, we will hypothesize that the the crushing index of the hard ore with the increased energy input of kw/t reduces the ball mill feed size to 6,500 micrometers. As a result, the mill output will increase with this reduced size to approximately 77,000 tons ...
WhatsApp: +86 188380728299.) Grinding efficiency of a ball mill is of the order of _____ percent. a. 15 b. 4050 c. 7580 d. 9095. Answer: a. 10.) Work index is defined as the a. gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen. b. energy needed to crush one tonne of feed to 200 ...
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WhatsApp: +86 18838072829High temperature of the ball mill will affact the efficiency. 3 For every 1% increase in moisture, the output of the ball mill will be reduced by 8% 10%. 4 when the moisture is greater than 5%, the ball mill will be unable to perform the grinding operation. 5. The bearing of the ball mill is overheated and the motor is overloaded.
WhatsApp: +86 18838072829V — Effective volume of ball mill, m3; G2 — Material less than in product accounts for the percentage of total material, %; G1 — Material less than in ore feeding accounts for in the percentage of the total material, %; q'm — Unit productivity calculated according to the new generation grade (), t/(). The values of q'm are determined by ...
WhatsApp: +86 18838072829The original ball load in the mill was 6614 lb. (3000 kg.) and the load at the end of the 694 hr. was 6338 lb. ( kg.). During this time, 590 lb. ( kg.) of balls less than 3 in. ( mm.) in diameter were discarded from the mill. The screen analysis of the ball charge at the end of the operation is shown in Table 20.
WhatsApp: +86 18838072829On bigger mills, which need heavy rods, the rod charging is made with a pneumatic or manual operated rod charging device. ... particles pass a screen with 25 x 25 mm apertures shall be ground to approx. 95% passing mm in a x m ball mill of 35 ton charge weight. In accordance with Olewski's formula. ... Higher mill capacity. Size ...
WhatsApp: +86 18838072829For example does a grinding between two given sizes that takes 6 kW/tonne at 40% full take 8 kW/tonne or some other number at 20% full? Marshal Meru. ... (if it is overgrinding then it has more capacity than needed and the ball charge can be reduced). In order to maintain good efficiency the grinding circuit should maintain a good circulating ...
WhatsApp: +86 18838072829The approximate horsepower HP of a mill can be calculated from the following equation: HP = (W) (C) (Sin a) (2π) (N)/ 33000. where: W = weight of charge. C = distance of centre of gravity or ...
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