Solid material comminution or disintegration – Processes – With application of fluid or lubricant material
Patent
1991-07-01
1993-06-01
Rosenbaum, Mark
Solid material comminution or disintegration
Processes
With application of fluid or lubricant material
241 24, 241 48, 241 52, 241 61, 241 80, 241275, B02C 2332
Patent
active
052152626
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of comminuting bulk materials wherein the material is introduced vertically from the top into a comminuting device [and is discharged following the comminution process.] from where it is introduced into a pile of material, with the fine-grained comminution products from this comminution process being discharged by means of an upwardly directed stream of air or gas and coarse grains flow to the bottom and are recirculated.
The general prior art includes so-called vertical impact crushers which are essentially configured of a feeder device in conjunction with a centrifugal wheel arranged concentrically around the drive shaft. The material is usually charged in at the top and is arranged by the centrifugal wheel in a concentric pile, with the motion energy of the accelerated charged-in particles being converted into comminuting work. The discharged material of the conventional vertical impact crushers also contains grain sizes which are not or only insufficiently comminuted. Particularly if the vertical impact crushers are employed as ore-comminution assemblies for ball mills, this results in the drawback that the use of coarse grinding bodies for comminuting these insufficiently pre-comminuted grain sizes from the vertical impact crusher are still required. To overcome this drawback, it is necessary to screen the material discharged from the vertical impact crusher and return the oversize grains for further comminution. This mode of operation has the drawback that a simple and rather malfunction-free comminution assembly becomes complicated and accordingly subject to malfunction due to the addition of transporting paths and classifiers. Another drawback is the considerably greater amount of space that is required.
German Patent No. DE-C 3,230,824 discloses a drying mill with pre-comminution. In this drying mill, a bottomless pre-comminuting assembly is combined with a subsequent tube mill through which flows hot gas and which serves as the fine grinding mill whose discharge conduit leads to a separator. The bottomless pre-comminuting assembly is equipped with a grate to limit grain sizes. The drawbacks of such a system are essentially that with insufficient pre-comminution the material above a certain grain size must be resupplied in a complicated manner to the intake chute of the pre-comminution system before it can be subjected to further screening. Another drawback is that the pre-comminution is able to yield only a relatively coarse fraction so that the subsequent tube mill must be designed to have at least two stages, that is, the amount of energy required for the fine grinding is relatively high.
German Patent No. DE-C 3,545,691 discloses a device for classifying dust-like bulk materials, particularly ground clinker, limestone or raw material for cement by separating in air. The material to be classified is fed onto the cover plate of a cylindrical rotor and is charged into an annularly cylindrical separating chamber extending between the rotor and a stationary blade ring surrounding the rotor. While the coarse material drops to the bottom in the separating chamber, the fine material is transported into the interior of the rotor and is fed into a subsequently connected separator device for separating the fine material and the separating air. To reduce energy consumption and simplify construction, the separating air carrying the fine material is discharged vertically downwardly by means of a pipe disposed below the rotor. The rotor as well as the blade ring are combined in the manner of building blocks of several identical sections. Such a device is not suitable for comminution but only for the separation of coarse and fine bulk components. Here again, another external comminution assembly must be provided to re-comminute the components separated as coarse material so that they can be introduced into the separator.
EP-A 102,742 discloses a vertical impact crusher for minerals. The material is charged laterally from the too and is introduced into a pile disposed radially
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Chin Frances
O&K Orenstein & Koppel AG
Rosenbaum Mark
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