A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...

THE METALLURGY OF ANTIMONY.
to further roast any remaining unoxidised sulphide. An ore
properly roasted should have an ashy-gray colour on cooling, and
should appear reddish in colour while in the furnace. Furthermore,
it should give a soft feeling under the rabble and should be free
from any fritting together of the mass. An excess of air is
necessarily required for the formation of the stable tetroxide instead
of the volatile trioxide.
The roasting of antimony glance for the production of the tetroxide
is now carried out in reverberatory furnaces, provided with arrange-
A, Description Foundation . H, J, Space Fire-bridge for . the ore of
D, B, Holo w below oxidised. the to K3 L, the Wate Arangement trough.
E, C, Grate. Ordinar Fire-brick y . brick. water r reservoir. to for nr
F, drip. alowin g
G, for Funel-shape Condensatio charging. opening d
for the n oxide. M, chamber Chimney .
furnaces ments for for condensation. the roasting In of Hungary ore dust mufl e werefu
be The described special first.
The stiring of the charge furna
as frequently as posible, to in prevent this any furnace
the The mas.
posible muffle the production of more furnac or les p
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