Nozzle and a tundish arrangement for the granulation of molten material
AssigneeUvan Holding AB
InventorPer-Ake Lundstrom
Life of this patent
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Abstract
A nozzle, a tundish arrangement used for the production of granulated material, and a method and apparatus for the production of a granulated material with an improved size distribution are provided. The grain size and grain size distribution is controlled by a nozzle having a specific design. The nozzle comprises an upper inlet opening, sidewalls forming a channel, a bottom and at least one outlet opening or at least one row of outlet openings at the lower end of the channel. The outlet opening(s) in the channel have a size of at least 5 mm in the smallest dimension. A cross sectional area of the channel at the inlet AC is at least 3 times bigger than the total area of the outlet openings AT.
Claims12
A nozzle for the granulation of molten material, for obtaining a granulated material having a mean size in a range of 10-50 mm, wherein an amount of fines in the granulated material with a size of less than 8 mm is limited to 5%, the nozzle comprising:
- an inlet defining an inlet opening,
- a bottom,
- sidewalls forming a channel from the inlet to the bottom,
- at least one row of no more than 4 outlet openings at a lower end of the sidewalls,
- wherein each outlet opening of the 4 outlet openings has a diameter of 10-35 mm,
- wherein AC≥6AT, with
- AC being a cross sectional area of the channel at the inlet opening, and
- AT being a total area of the 4 outlet openings, and
- wherein the granulated material is selected from a group comprising iron, pig iron, steel, and ferroalloy.
Dependencies are inferred from the claim text.