Muf′fle—fur′nace.
(
Metallurgy.) A furnace with a chamber which is surrounded by incandescent fuel, and in which cupellation or fusion of metals is performed; the former especially.
(See cupellation.) The holes in the sides of the muffle are important, as through them a draft is established which oxidizes the lead and some other associated metals.
|
Muffle-furnace. |
a, muffle. | c, closed muffle. |
b, muffle-furnace. | d, cupel-mold. |
In the process of assaying, the
muffle contains the cupel in which the metal is placed.
Arsenic is sublimed from arsenical pyrites in a muffle whose eduction-channel leads to a condensing chamber where the arsenious acid is deposited.
See arsenic-furnace; cupellation.