Rods are also generally more expensive than balls and harder to handle. This means a rod mill equal in capacity to a ball or SAG mill would take up more plant floor area requiring a larger building. Also since SAG (semiautogenous grinding) uses less media than a comparable rod or even ball mill.
Rod mill As there should be very little direct impact in rod mills, thanks to the rolling charge motion, and as rod mills are rarely bigger than 4 meters in diameter, it is possible to use harder, more brittle cast alloys such as cast highchrome metal liners or composite rubber liners with hard cast inserts on the mill shell. However, the rods
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 and finally the type of circuit open/closed ...
Although they have the similar working principle, there are many differences between ball mill and rod mill on details. 1. Configuration of ball mill and rod mill. The proportion of cylinder shape is different. The cylinder lengthdiameter ratio of rod mill is generally, while the cylinder lengthdiameter ratio of ball mill is smaller ...
The feed enters one end of the ball mill, and discharges out the other end. Ball mills vary greatly in size, from large industrial ball mills measuring more than 25 ft. in diameter to small mills used for sample preparation in laboratories. Rod mills are similar to ball mills and use metal rods as the grinding media. Pebble mills use rock ...
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. Different materials are used as media, including ceramic balls, flint pebbles ...
Grate Discharge Ball Mills have shown 25% to 45% more tonnage ground and a substantial reduction in power consumed per ton of material compared size for size with overflow mills. To illustrate the characteristics of various type mills we have shown the types of discharge for rod mills and ball mills. There are essentially four types of rod mill ...
The ball load was 455 stainless steel balls one inch in diameter, having a total weight of 30 kg. The particle size distribution was observed after 20, 40, 60, 80, 100, 150, 200 and 300 ball mill revolutions. The energy input was calculated from the net torque (corrected for the torque for the empty mill) and the number of revolutions.
Tube mills. Rod mills. Ρebble mills. Ball mill. The term "ball mill" is usually applied to a mill in which the grinding media are bodies of spherical form ("balls") and in which the length of the mill is of the same order as the diameter of the mill body; in rough figures the length is, say, one to three times the diameter of the mill ...
Rod mill is a rollertype grinding device with a long and round metal rod as the roller. In 1870, a rod mill with uniform discharging particle size was developed on the basis of the ball mill. ... the diameter of the overflow rod mill's discharge port is larger than that of the overflow ball mill of the same specification (the diameter of the ...
In rough grinding, when the output size is 13mm, the processing capacity of the rod mill is greater than that of the ball mill of the same specification; when used for fine grinding, the particle ...
If N is taken to be the gross mill power, values of the factor c in wet grinding mills will be. rod mills 1/1800 ball mills, grate discharge 1/1200 ball mills, overflow type 1/1470 pebble mills 1/1200. W for rod and ball mills shall be taken as the weight of the rod or ball charge, the weight of the pulp is to be ignored.
the impact of ball mill parameters and the feed directed to grinding on its effectiveness and comparing it with the efficiency of grinding in a rod mill. The research was carried out for grinding copper ore processed in O/ZWR KGHM PM The aim of the research was to
SAG Mill vs Ball Mill. ... Simple repeatable work index tests are usually sufficient for rod mill and ball mill tests but pilot plant tests on 50100 tons of ore are frequently necessary for autogenous or semiautogenous mills. Preparation and selection of the test sample is of utmost importance. Procedures for autogenous and semiautogenous mill ...
As a ball mills supplier with 22 years of experience in the grinding industry, we can provide customers with types of ball mill, vertical mill, rod mill and AG/SAG mill for grinding in a variety of industries and materials. Contact. Email: info; Tel: +86 ;
Ball Mills. 【 Capacity 】 T/H. 【 Max Feeding Size 】 <25mm. 【 Discharge Size 】 【 Types 】Overflow ball mills, grate discharge ball mills. 【Advantages】 Designed for long service life and minimum maintenance, can grind and homogenize mineral ores down to the nano range, with a large processing capacity.
the total number of ballmill tests made has more than doubled, and rodmill tests have becomeincreasingly important. Nearly all of the standard closedcircuit ballmill and rodmill tests made to date are included in the present tabulation, together with additional information not previously published.
In terms of breakage mechanisms, while abrasion and impact prevail in ball mills, rod mills are used for their type of preferential grinding over larger particles . In general, in the milling stage, in order to avoid the generation of finer particles, the most desirable effect should be impact and compression, rather abrasion and shear, as ...
Rod mills are similar to ball mills but use long rods for grinding media. Autogenous mills are selfgrinding mills that use the ore itself as grinding media. C. Advantages and Disadvantages. Tumbling mills offer several advantages, including high capacity, low maintenance, and relatively low cost. However, they also have some disadvantages ...
Fig 1 Cross sections of a rod mill and a bar mill. Ball mills. Ball mill (Fig 1) is same kind of mill as rod mill, except that it is filled with balls instead of rods. Because of balls have greater ratio of surface area than rods they are more suitable for fine grinding. Balls are also lighter, so the kinetic energy of a single dropping ball is ...
Ball and rod mills are grinding mills commonly used in mining, construction, and chemical industries. The difference between the two lies in their design and operation. A ball mill consists of a cylindrical shell rotating horizontally, while a rod mill has a more elongated body rotating horizontally but at a lower speed. The speed at which the ...
However, Bond Work Indeces are related to the type of equipment to be used (rod mill, ball mill, SAG uses Drop Ball parameterKwhr/m3, so it is more complex than just specific energy consumption ...
The Bond Ball Mill Work Index remains today as the only tool used for ball mill scaleup design. For an (only nominally, not at all materially modified) update on its use for industrial mill sizing, see " Selection of Rod Mills, Ball Mills, Pebble Mills, and Regrind Mills," Rowland, C. A., Jr., 1982, Chapter 23, Design and Installation of ...
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