Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – With means to cool treating means
Patent
1997-01-21
1998-06-30
Sheehan, John
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
With means to cool treating means
164423, 164429, 164443, 164479, C21C 100
Patent
active
057721874
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an apparatus for cooling and processing a molten product into a granulate product, said apparatus comprising: element, arranged for rotation about a substantially vertical shaft, support, form.
2. Background Art
Such an apparatus is known from U.S. Pat. No. 4,500,349 and is intended for producing a salt-coated metal granulate. The means for depositing the molten product provide this product on the support in a thin layer. After the product has solidified, it is removed from the support with a scraper, and the solidified product is broken and crumbled to obtain the desired granulate form. This may lead to dust formation, which may necessitate the provision of an enveloping case.
For solidifying the product, the support is cooled at the upper and lower sides by means of a fluid passing over the product and the support in gaseous form. It has also been proposed to cool the lower side of the support by means of a liquid to be jetted against it. In a number of cases, direct contact between product and coolant will not be allowed or will necessitate the use of an expensive inert gas. A liquid coolant will be able to evaporate and thus contact the product, which involves limitations to the products to be processed.
DE-B-1 005 533 discloses an apparatus for the production of granulates from a molten material, said apparatus comprising an inclined disk-shaped element with cooling liquid channels closed in themselves and connected to feed and discharge means for cooling liquid without connection to the environment.
SUMMARY OF THE INVENTION
The object of the invention is to improve an apparatus of the type described in the opening paragraph in such a manner that with a compact apparatus any product can be processed with a minimum of dust formation problems and with good cooling possibilities without the risk of contact between processed product and coolant.
In accordance with the invention, this is realized in that the cooling means comprise per disk-shaped element two interlocking, spiral-shaped cooling liquid channels closed in themselves that form part of the disk-shaped element, each spiral-shaped channel having an outer end and an inner end, and one spiral-shaped channel having an inlet for cooling liquid located adjacent its outer end and an outlet for cooling liquid located adjacent its inner end, whereas for the other spiral-shaped channel this is the other way round, with feed and discharge means for the cooling liquid extending centrally through the disk-shaped element, said channels being connected to said feed and discharge means without connection to the environment. By virtue of these features, the advantages of a horizontal supporting face and a completely closed cooling system are combined by opting for a rotating horizontal displacement, the disk-shaped support being provided with internal cooling channels, i.e. a closed cooling system instead of spray nozzles. The disk-shaped design of the support also means a relatively compact construction that, partly due to the closed cooling system, can readily be provided with a casing, if desired, for instance because the solidification of the molten product involves formation of gases that should be kept from the environment, or for instance because an oxygen-sensitivity of the product requires operating in an inert atmosphere. By the interlocking configuration of the cooling channels, the continuous flow-through of the cooling channels can be realized in a relatively simple manner. Further, it is not only possible to optimally cover the surface of the disk-shaped element, but also to effect a maximally uniform change of cooling temperature throughout the surface by feeding the two channels in counterflow. In this connection, in accordance with a further embodiment of the invention, it is preferred that the inlets as well as the outlets of the two channels connect to an annular channel in the vertical shaft.
The provision of cooling channels in the support can be realized in m
REFERENCES:
patent: 2910744 (1959-11-01), Pond
patent: 3642053 (1972-02-01), Wiley et al.
patent: 5067554 (1991-11-01), Bosswell et al.
Graafland Alwin
t Hart Wijnand Jacob
Wirodihardjo Abimanjoe Saroso
Goudsche Machinefabriek B.V.
Sheehan John
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