Standard Bond work index value of the mill feed material was also experimentally determined as kW h/ton according to TS 7700 standard ... using a 90 μm test sieve. Ball mill model. Airswept ball mill was modelled using the perfect mixing modelling approach (Whiten, 1974) which defines the comminution process in terms of three ...
WI= Work Index= specific energy per ton, kwh/metric ton (characterizes the ore) F80 = 80% passing size of the circuit feed, in microns. P80 = 80% passing size of the circuit product, in microns. Example. The dry feed of a ball mill circuit is 300 t/h. The power at the pinion of the ball mill is 1800 kW.
If P is less than 80% passing 70 microns, power consumption will be. Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work ...
Fig. 1 Schematic diagram of ball mill grinding process. The variables of this process shown in Fig. 1 are explained as follows: W M: Fresh feed rate of runofmine ore / (t·h−1); F M: Water feed rate to ball mill / (t·h−1); F S: Water addition rate to sump / (t·h−1); P H: Feeding pressure to hydrocyclone / kPa; D
A typical ball mill will have a drum length that is 1 or times the drum diameter. Ball mills with a drum length to diameter ratio greater than are referred to as tube mills. Ball mills may be primary or secondary grinders. Primary grinders are fed from crushers such as a jaw crusher. Secondary grinders are fed from other grinders a ...
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? Assume that Rittinger'slaw is applicable. •It is desired to crush 10 ton/hr of iron ore hematite. The size of the feed is such that 80% passes a mm screen, and 80% of product a screen.
The makeup feed consisted of 32% limestone, 67% clay and 1% pyrite ash, with a mean specific gravity of tonnes/m 3. The moisture content of makeup feed and the dry mass flow rate of the combined mill feed were % and tonnes/h, respectively.
There are also industrial planetary ball mills with productivities of up to 35 tons per hour. Undoubtedly, ball mill mixers are a costeffective equipment at labscale level; from a manufacturing point of view, wet milling requires knowhow and some additional equipment such as premixers, pumps, and filters among others, which in the end ...
Tube mills have a ratio of length to diameter of [36 : 1], for ball mill this relation is[<2 : 1]. Two different processes occur inside the mill: 1 Crushing: Breaking up of the incoming particles from a size of about 30 mm to a size of minus mm diameter. ... K = Consumed Power C = Constant (from fiqure) Q = Ball charge weight (ton) Di ...
GATECHmo4mark. mo. A continuous grinder obeying the Bond crushing law grinds a solid at the rate of 1000 kg/h from the initial diameter of 10 mm to the final diameter of 1 mm. (i) If the market now demands particles of size mm, the output rate of the grinder (in kg/h) for the same power input would be reduced to.
ball mill 3 5 tones h where an approximate figure for the constant is for rod mills, for overflow ball or pebble mills and for grate discharge ball or pebble mills. ç is specific gravity of grinding media for rods or balls normally q is the charge volume in fraction of mill volume 40 % = nc is the mill speed in fraction of critical speed Get Price
An increase of over 10% in mill throughput was achieved by removing the ball scats from a single stage SAG mill. These scats are non spherical ball fragments resulting from uneven wear of balls ...
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A Bond ball mill work index is then performed on the mill product for the design of SAGball mill circuits. This is important because it was found that there was a kWh/t higher ball mill work index if the mm ball mill test feed size is obtained by SAG mill grinding compared with crushing.
الصفحة الرئيسية / ball mill 3 5 tones h. ... x d Ball mill Z4 1 H 1 S 2 S 3 H 2 eXedur SNP a e Z4 a p 40° 30° 1 L ø D ø d 1 l 1 l 2 r eaduarter and roduction RN SA AN hone 41 91 610 40 00 Fax. 41 91 610 40 10 mtomikron roduction and Regrinding RN H R hone 49 741 5380 450 Fax. 49 741 5380 ...
Reading Lecture In ball mills, steel balls or hard pebbles to break particle based on impact and attrition. A rotating mill charged with media and ore is lifted against the inside perimeter. Some of the media falls and impacts the ore particles at the bottom of the mill.
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Ball mills. The ball mill is a tumbling mill that uses steel balls as the grinding media. The length of the cylindrical shell is usually times the shell diameter (Figure ). The feed can be dry, with less than 3% moisture to minimize ball coating, or slurry containing 2040% water by weight.
Transmission device: The ball mill is a heavyduty, lowspeed and constantspeed machine. Generally, the transmission device is divided into two forms: edge drive and center drive, including motor, reducer, drive shaft, edge drive gears and Vbelts, etc. 4. Feeding and discharging device: The feeding and discharging device of the ball mill is ...
In the standard AC 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 produced per revolution of the 12″ x 12″ test ball mill. The closed circuit 80% passing size P averages P1/log 20 for all sizes larger than 150 mesh.
The circuit processes approximately 8000 tph of a copper ore, with typical Cu feed grades of %. Ball mills 1, 2 and 3 from two SAG lines were tested to estimate the residence time distributions by radioactive tracer experiments. Figure 1 presents a schematic of the SAG lines 1 and 2. Each line involves 11 m × m SAG mills.
The feed averages 5 cm diameter. The capacity of the grinders is 3 ton/hr. The analysis of the products are given below. Calculate the power used by each of the grinders assuming Rittinger's law. Aperture Dpi (mm) Mass % retained on primary grinder. Mass % retained on final grinder. 4 2 20 1 30 0 30 0 15 10 0 5 20 0 30 0 30 0 10
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When the slurry ores discharged from the ball mill, the classifier will classifing them, the small and light ores will be overflow, and the coarse particles will be fed into the ball mill for grinding again. 3. The 3rd Step (1) separating by centrifugal concentrators.
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