Ball Mill Operation Pdf
In cascade mode grinding occurs as a result of crushing and abrasive actions by grinding balls. This is particularly recommended for multiple mill installations where it is difficult to control the different phases of installation for each and every mill.
If, on the other hand, the grouting is in excess of. Place the housing proper on the foundation, level with steel shims and tighten the foundation bolts. We have a metallurgical test for every possible mineral type and treatment. The erection phase of this mill is actually no place to attempt cost savings by taking short cuts, or by-passing some of the work.
The operating principle of the ball mill
Blending of explosives is an example of an application for rubber balls. We have now reached the point where a half ball or rod charge can be added, and the mill run for another six to eight hours, market breadth indicators pdf feeding approximately half the anticipated tonnage.
Pharmaceutical uses of Ball Mills
Furthermore, the liners can be in place, as stated above, and the gear can be mounted, as covered by separate instructions. The curved surface of natural slope is close to the plane inclined at some angle to the horizontal. Move the trunnion bearings to their approximate position by adjustment of the set screws provided for this purpose. The following figures may be used for preliminary foundation calculations.
In making your final selection of lubricants, you should consider the actual plant conditions as well as the standardization of lubricants. These units are to be permanently grouted in position and, therefore, care should be taken to assure correct alignment. This unit consists of the housing proper, plug door, plug shaft, arm, and various hinge pins and pivot and lock pins.
The operating principle of the ball mill
We further recommend that during the first thirty to sixty days of operation, particular attention be given to bolt tightness, foundation settlement and condition of the grouting. If there are any scratches, it is very possible that some foreign material such as weld splatter may have been drawn down into the bushing, and can be found imbedded there. Except when water proof washers are used, it is advisable to wrap four or five turns of candle wicking around the shank of the bolt under the cut washer. Care should be taken not to foul the teeth in the gear or pinion. The general idea behind the ball mill is an ancient one, but it was not until the industrial revolution and the invention of steam power that an effective ball milling machine could be built.
If a spout feeder is to be used, it is generally supplied by the user, and should be mounted independently of the mill. This comes about due to the improper setting of the bearings in the longitudinal plane. Pinion bearings are provided of either the sleeve type or anti-friction type.
Very often when the grouting is not up to specification the vibration from the mill tends to disintegrate the grouting. Realign the gear and pinion by the use of shimming between the trunnion bearing base and the sole plate at the low end. In such cases as those, a light weight sheet steel discharge housing is supplied by the user to accommodate the local plant layout in conjunction with the discharge launder. As a safety precaution, and in many cases in order to comply with local safety regulations, guards should be used to protect the operators and mechanics from contact with moving parts.
They should be thoroughly tightened again. Another good method of preventing this pulp race is the use of the sponge rubber which can be cemented in place. There are two kinds of ball mill, grate type and overfall type due to different ways of discharging material. The trunnion journal should also be checked for uniform oil film and for any evidence of foreign material which might manifest itself through the appearance of scratches on the journal.
If the liners are of a special directional type, or in any other way complicated, a separate layout drawing is submitted with the other drawings of the mill. Dip the candle wicking in white lead. The disadvantages of ball mills include their considerable metal consumption and deterioration grinding media, as well as a lot of noise. The grinding balls in the grinding jars are subjected to superimposed rotational movements, the so-called Coriolis forces.
Normal inspection and cleaning procedure should be followed. Portland cement mixed with sand and aggregate in the proper proportions has come to be standard practice in making concrete. Install the retainer ring and splash ring as shown. In the larger size mills, the lower portion is sometimes made of concrete. In most cases the trunnion liners are already mounted in the trunnions of the mills.
These grate set screws should be adjusted with the side clamp bar bolts loosened. This matching is important as it fixes the relationship between the discharge from the scoop and the internal spiral of the trunnion liner. In some cases because of space limitation, economy reasons, etc. Grinding can be carried out either wet or dry but the former is performed at low speed. The center of pressure must always pass through the center of the footing.
For general reference cement is usually shipped in sacks containing one cubic foot of material. The purpose of this manual is to assist you in the proper installation and to acquaint you a bit further with the assembly and care of this equipment. Metallurgical assay Non-ferrous extractive metallurgy.
These will allow the lifting of one end of the mill by use of jacks in the event maintenance must be carried out under these conditions. This does not exclude a search energy saving solutions for milling, and this handled by experts from around the world. During the breaking-in period, that is, during the first few weeks of operation it is advisable to supplement brick grease with the oil drip system, until the bearing temperature has been stabilized. Adequate foundations for any heavy equipment, and in particular Marcy grinding mills, are extremely important to assure proper operation of that equipment. Sound planning and good judgement will, to a great extent, be instrumental in avoiding many of the troublesome occurrences especially at the beginning of operations.
When relining any part of the mill, clean away all sand from the parts to be relined before putting in the new liners. It is not the function of the brass oil seal band to provide tension for effective sealing. In this way, you will be better able to anticipate your needs for liners and other parts in time to comply with the current delivery schedules. Unless the millwright or operator is familiar with this type of seal, there is a tendency to assume that the oil seal is too long because of its appearance when held firmly around the trunnion. Depending upon available handling facilities, the head or shell can be lined separately in a repair bay, or after assembly of the mill proper in the trunnion bearings.
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