>Ploquin Alain wrote:
>> Viscosity is fonction of composition, temperature and polymerisation of the
>> liquid (melt). In the "Schlaken Atlas" edited by the VDE (a german
>> association for metallurgists), many diagramms are available.
>> A.Ploquin
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>
>To be more specific. Is there data from 17/18th century blast furnaces?
>How much of a data base is there? I have access to the Schlackenatlas.
>
>Thanks
>JH Brothers IV
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Composition of slags is not a fonction of its age but depends of ore,
additive (such as castine) and charcoal, and of furnace itself.
In french we have a name fort typical slags from blast furnaces: laitier.
It is possible to characterize "archaïc" laitiers: more heterogeneous, with
more cavities and/or inclusions of charcoal, more ofen with metallic prills
("laitier à grenaille"); under microscope there are ofen relics of
quartz-crystobalite, some wustite or magnetite may occur, some small
iron-sponge parcells may occur also. These archaïc glass or cristallized
matrix is richer (some % "oxyde") in iron (without "grenaille") than more
evoluated one. I do not take here in account modern (recent) blast furnaces
with very calcic laitiers (CaO>= SiO2).
Archaïc laitiers have to be related with a "low" temperature and, ofen?, a
charge not very homogeneous.
I have some chemical analyses of archaïc laitiers (e.g. a short paper have
to be published in the volume from a colloquium, in october?, Le Fer dans
les Alpes, St Georges d'Hurtières, Savoie, octobre 1998).
Alain Ploquin
Alain Ploquin
Centre de Recherches Petrographiques et Geochimiques (UPR A9046)
Centre National de la Recherche Scientifique
B.P.20
F-54501 Vandoeuvre-les-Nancy cedex
France
tel: 33/(O)383594245 fax: 33/(0)383511798
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