Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1983-01-07
1985-01-29
Rutledge, L. Dewayne
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75130B, 266216, C22C 3310
Patent
active
044963939
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a plunging vaporization chamber or capsule for introducing highly volatile, vaporizable additives, such as pure magnesium, into a pig iron, cast iron or cast steel melt in a treatment vessel for desulfurization or production of nodular graphite iron, vermicular graphite iron or magnesium treated cast iron.
BACKGROUND OF THE INVENTION
Pure magnesium has been used for desulfurization of pig iron, steel or cast iron, as well as for the production of cast iron with nodular or vermicular graphite or the production of magnesium treated cast iron. Conventionally, the magnesium is introduced by a plunging arrangement made from ceramic working materials, either with or without metal reinforcement.
Most conventional plunging arrangements are disadvantageous in that they are difficult to operate, and are not efficient. Additionally, the results obtained by the conventional arrangements are not sufficiently reproducible.
One conventional plunging capsule is disclosed in German AS No. 2,208,960. This capsule for introducing magnesium into a metal melt has a complicated and expensive construction. Moreover, this conventional arrangement only permits a relatively minor use of the stirring effect produced by the kinetic energy of the emerging vapor from the capsule.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a plunging capsule and process for introducing a highly volatile, vaporizable additive, such as pure magnesium, into a metal melt in which an optimum and thorough mixing of the vapor with the metal melt is achieved in a reproducible manner and to the highest degree possible.
Another object of the present invention is to provide a plunging capsule and process for introducing a highly volatile, and vaporizable additive, such as pure magnesium into a metal melt in which the variations of pressure in the chamber generated by the controlled vaporization of the additive and the pressure variations of the escaping vapor are largely reduced.
A further object of the present invention is to provide a plunging capsule for introducing a highly volatile, vaporizable additive, such as pure magnesium into a metal melt which is simple in construction, is easy to manufacture and operate, and can be employed in a variety of different ways, for example, as a single-use or multi-use chamber.
The foregoing objects are obtained by a plunging capsule for introducing a highly volatile, vaporizable additive, such as pure magnesium into a pin iron, cast iron or cast steel melt in a treatment vessel for desulfurization or production of nodular graphite iron, vermicular graphite iron or magnesium treated cast iron. The capsule comprises a wall oriented vertically in an operating position of the capsule, and has an upper portion forming two-thirds of the wall and a lower portion forming one-third of the wall. The wall defines a chamber for the additive. At least one outlet opening is provided in the upper portion of the wall and has a first transverse cross-sectional area. At least one inlet opening is provided in the lower portion of the wall and has a second transverse cross-sectional area which is less than the first transverse cross-sectional area.
The foregoing objects are also obtained by a process for introducing magnesium into pig iron, cast iron or cast steel melt in a treatment vessel for desulfurization or production of nodular graphite iron, vermicular graphite iron or magnesium treated cast iron, comprising filling a chamber of a capsule with liquid magnesium. The capsule has a vertical wall with an upper portion forming two-thirds of the wall and a lower portion forming one-third of the wall. An outlet opening is provided in the upper portion with a first transverse cross-sectional area. An inlet opening is provided in the lower portion with a second transverse cross-sectional area less than the first cross-sectional area. The magnesium is solidified and the capsule filled with solidified magnesium is submerged into the melt in the treatmen
REFERENCES:
patent: 3788624 (1974-01-01), Miller
patent: 4022444 (1977-05-01), Jackman
George Fischer Limited
McDowell Robert L.
Rutledge L. Dewayne
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