The "Slag-Eye Furnace" was used around 1910 in the USA by the Lone Elm
Works of Pichler (who had 3) and by Bristol Resublimed Lead Co. It was a
small blast furnace with the dimensions of an English Slag Hearth (ie about
2ft square hearth with a shaft about 6 ft high). There tthe similarity
ended. It was used to produce white lead and today would have been
referred to as a 'fuming furnace'.
It had 4 tuyeres just above hearth level and a further 7 tuyeres about 2'3"
above these. The charging door was immediately above the second set of
tuyeres. It was run on coke with a 'hot top'. ie the surface of the coke
was kept incandescent. White lead was collected in a baghouse after
suitable cooling. Chemically this would have fumed as Pb/PbO and then
been converted to basic carbonate by CO2 on cooling in the baghouse.
Throughput was relatively low with a mixed charge of about 1 tonne/day of
grey slag from advanced ore hearths, 0.6 tonnes/day of 'blue powder'
(condensed ore hearth fume collected in baghouses) and 0.3 tonnes/day
roasted Pb/Zn ores. A properly run ore hearth of these dimensions would do
much more than this. The low throughput is evidence of the high
coke/charge ratio needed for fuming.
Drawings and description in H.L. Collins, "Metallurgy of Lead", Griffin,
London, 1910 - p.59.
Richard Smith
Richard Smith
3M UK Bracknell,
Environment, Safety and Security [log in to unmask]
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Peter Claughton
<P.F.Claughton@EX
ETER.AC.UK> To
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<mining-history@J
ISCMAIL.AC.UK> Subject
Re: slag-eye furnace
11/12/2004 10:01
Please respond to
"The
mining-history
list."
<mining-history@J
ISCMAIL.AC.UK>
At 21:50 10/12/04 -0000, BARRY JONES wrote:
>Can anyone help with the term slag-eye furnace which I have just come
across.
>
Barry,
Date and context would be useful, including the text in which the term
appears. My initial thought is that this is an old or local form of
spelling and is probably referring to a slag hearth.
Peter
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Dr Peter Claughton,
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Hon. University Fellow
School of Historical, Political and Sociological Studies (Centre for South
Western Historical Studies)
University of Exeter
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