--_American
Naturalist_.
* * * * *
THE REMOVAL OF NOXIOUS VAPORS FROM ROASTING FURNACE GASES.
In a paper read before the Aix-la-Chapelle section of the _Verein
deutscher Ingenieure_, Herr Robert Hasenclever presents a summary of
the results obtained with various methods for the absorption of the
sulphurous acid generated during the roasting of zinc-blende and other
sulphurets. Though most of our own metallurgical works are not so
located as to be forced to pay much attention to the removal of noxious
vapors, the efforts made abroad possess some interest for American
metallurgists. Besides containing sulphurous acid, the gases from the
roasting furnaces hold varying quantities of sulphuric acid, and Dr.
Bernoulli describes a process applied on a large scale in Silesian zinc
works, where the gases were passed through towers filled with lime. It
was found that there was no trouble on account of the absorption of
carbonic acid by the lime, and that the latter acted very efficiently
in reducing the quantity of sulphurous acid. Before entering the tower,
they contained 0.258 per cent. by volume of sulphurous acid and 2.45 per
cent. of carbonic acid; while, after their passage through it, they
held 0.017 and 2.478 per cent, respectively.
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