Metallurgical apparatus – Means for introducing fluent into vessel – e.g. – tuyere – Having means preventing damage to introducing means – e.g.,...
Patent
1986-03-04
1987-06-02
Rutledge, L. Dewayne
Metallurgical apparatus
Means for introducing fluent into vessel, e.g., tuyere
Having means preventing damage to introducing means, e.g.,...
266265, C21C 534
Patent
active
046697098
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for injecting gases into molten metal, alloys, minerals and the like, e.g. steel, aluminum, silicon, silicon alloys, to thereby honogenize, refine or in other ways treat the molten material.
The treatment of melts, particularly metal melts, with gases is well known within industry, and may have several different aims, e.g. stripping of undesirable, completely or partly dissolved gases from the melt, oxidation or reduction of some of the components of the melt to completely or partly eliminate these, e.g. as slag-forming oxides or volatile oxides; or gaseous reactants which are blown into the melt are intended to react with components thereof forming new, desired components of the melt. Many different, and partly specific, aims of gas treatment of metal melts are disclosed in the litterature. Examples are shown in Swedish Patent Publications Nos. 375 122; 395 912 and 413 327; and French Pat. Nos. 2 013 546 and 2 012 305.
Several of the well known devices for the above mentioned purpose comprise a porous, refractory body which is permeable to the gas to be injected or blown in, but not permeable to the molten material which is to be gas treated, whereby the porous body prevents draining of the melt.
One of the drawbacks of porous bodies is that they possess relatively high resistance to penetration of gas and thus relatively low capacity in this respect.
When relatively great amounts of gas are to be injected, injecting devices are suitably used by which the gas is injected via one or several tubes or borings in the device. The above mentioned problem of preventing the molten material from penetrating into the injection device must also in this case be solved. If not, there will be a risk of great drawbacks and frequent replacements of the injection device. A conventional solution of said problem is to circulate cooling fluid through part of the injection device whereby melt penetrating into the device from the container solidifies and prevents the outflow of the melt. Such an injection device is disclosed by DE-PS No. 2 503 672. With respect to embodiments of constructions of injection devices reference is further, more generally, made to e.g. DE-PS Nos. 1 508 263B and 1 508 282B and SE-PS No. 301 733B.
SUMMARY OF THE INVENTION
During the work of development of the injection device according to the invention the aim has been to provide an improved device for injecting gases into molten metals, alloys etc. (in the following for the sake of brevity called "the melt") contained in any container, reactor, ladle or the like, and where the device is mounted in the wall lining of the container beneath the bath level or preferably in its bottom lining.
Among the requirements to be met by the device the following are mentioned more particularly:
(a) High degree of safety against the melt flowing out via the injection device.
(b) Effective dispersion of injected gas in the melt.
(c) High degree of capacity flexibility.
(d) Long working life of the injection device.
(e) Possibility of convenient and quick replacement of the injection device from outside.
(f) Flexible adaptability to different containers/ladles/reactors and thickness of linings.
The injection device of the invention, which has been found to fulfil these requirements in a very satisfying way, comprises three main sections.
(1) a front section of refractory material which is also resistant to the melt in question and which has a number of perforations for supplying gas to the melt,
(2) a middle section which at least partly consists of heat conducting material and has a number of perforations communicating with the perforations of the front section,
(3) a rear section wherein at least the outer (peripheral) part is made of heat conducting material, which rear section in or adjacent to its peripheral parts has a helical duct communicating with perforations of the middle section and being provided to convey said gas from an external gas source.
According to a preferred embodiment of
REFERENCES:
patent: 3834685 (1974-09-01), Ziemkiewicz et al.
Pettersen Nils
Skei Bjarne
McDowell Robert L.
Rutledge L. Dewayne
Tinfos Jernverk A/S
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