Metallurgical apparatus – Means for introducing fluent into vessel – e.g. – tuyere – Having means preventing damage to introducing means – e.g.,...
Patent
1988-04-29
1990-02-20
McDowell, Robert
Metallurgical apparatus
Means for introducing fluent into vessel, e.g., tuyere
Having means preventing damage to introducing means, e.g.,...
106121, 138145, 501101, 501119, 501121, 501122, C21C 548
Patent
active
049019830
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a blast pipe which is intended for transporting gas, such as oxygen and/or solid material primarily in conjunction with metallurgical processes, and which can withstand high temperatures, said pipe comprising for this purpose at least one layer of refractory material which includes a refractory mixture of particulate solids and an alkali-silicate binder.
Blast pipes of the kind intended here are used to blow gas, such as oxygen, argon or nitrogen, or gaseous mixtures into primarily molten metal baths in conjunction with metallurgical processes, such as in the manufacture of steel in electrosteel furnaces. Applications are also found in which such pipes are used to inject a mixture of gas and solids intended for metallurgical purposes.
Blast pipes of essentially the aforesaid kind and intended for the aforesaid purpose are known to the art. One problem encountered with known blast tubes, however, is that peeling occurs due to the mechanical weakness of the layer. Furthermore, the refractory mix from which the layers are formed often requires very exclusive and expensive constituents. Known blast pipes are made of steel and the outwardly facing parts of the pipe are alloyed with aluminium by diffusion. in order to improve the high temperature properties. This alloy constitutes a very expensive part of the pipe manufacturing process.
The object of this invention is therefore to provide a blast pipe which can be produced at relatively low costs and which will also have a long useful life when used in the aforesaid context, thus satisfying the high demands placed on such blast pipes in this latter regard.
The invention thus relates to a blast pipe which is intended primarily for delivering gas, such as oxygen, and when applicable, solids to metallurgical processes, and which will resist high temperatures and which, to this end, incorporates a layer of refractory material which includes a refractory mixture of particulate solids and an alkalisilicate based binder.
The inventive blast pipe is particularly characterized in that the primary constituent of the binder is a polymerized alkali silicate.
The invention will now be described in more detail with reference to embodiments thereof.
The inventive blast pipe comprises a pipe onto which the aforesaid layer is applied. The pipe is normally made of steel, although other materials may also be used. For example, there may be used a steel pipe which has a tubular paper casing fitted externally thereon, this paper casing preferably being impregnated with a refractory substance, such as alkali silicate. The pipe may also be made predominantly of paper. Pipes which are made essentially of plastic materials, fibre glass or like materials are also conceivable.
According to one preferred embodiment the binder used in the refractory material of said layer is of the kind used in the manufacture of glues and adhesives. A particularly preferred binder is one which is sold by EKA Nobel AB under the designation "BINDZIL FK 10", or some other binder which is used in the manufacture of glues or adhesives and which has a similar composition.
"BINDZIL FK 10", in accord with product information from EKA Nobel AB, is the trade name for a Polymerized Alkali Silicate and specifically is a composition including a sodium silicate solution.
Preferably the particulate solids of the refractory mix of solid particles incorporating said refractory material comprise essentially metal oxides. In many cases it is preferred that the refractory mixture of solid particles has a composition which is similar to the composition of furnace lining material and corresponds to the kind used in metallurgical vessels intended for metallurgical processes of the kind intended here.
According to one embodiment the aforesaid mixture comprises essentially a so-called magnesite mixture, the predominant constituent of which is magnesium oxide (MgO) and the remaining constituents of which include further oxides, such as lime (CaO), quartz (SiO.sub.2), iron oxide (Fe.sub.2 O.sub.3) an
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Condensed Chemical Dictionary, Eighth Edition, Van Nostrand Reinhold Co., New York, 1971, p. 533.
McDowell Robert
Oxy-Tuben AB
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