Melting Brass in a Rocking Electric Furnace Page: 33
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EXPERIMENTS WITH LABORATORY ROCKING FURNACE.
HEAT L18.
In heat L18, power consumption and metal losses were secondary,
as the heat was run for the purpose of testing pyrometers for brass
in molten metal at high temperatures. This meant holding the
metal in the furnace a long time and having the door open a great
deal.
The furnace was first preheated 8 minutes, using 5 kilowatt-hours,
then some very bulky red brass gates were charged, the power being
off 12 minutes. Then the arc was run 25 minutes, using 8.5 kilowatt-
hours, and more gates were charged. After being off 5 minutes the
are was run 16 minutes, using 11 kilowatt-hours. After another
5-minute period in which the rest of the 67-pound charge of gates
was put in, the arc was run 7 minutes, using 5.5 kilowatt-hours, when
the temperature was 1,0000 C. After being off for 8 minutes, the
arc was run 10 minutes, using 6 kilowatt-hours, when the temperature
was 1,2000 C. In the whole heat, including preheating, 35 kilowatt-
hours was used, starting with a cold furnace. The pyrometer tests
were then started, the door being open most of the time, while the
power was off. After 18 minutes 5 kilowatt-hours more was used
in 8 minutes. The temperature was then 1,2150 C. After 13 min-
utes 4 kilowatt-hours was put in in 5 minutes, but so much heat
had been lost in the 13 minutes the power was off and the door open
that the temperature was only 1,1600 C.
The power was only off 5 minutes after this, and 4 kilowatt-hours
in 8 minutes gave a temperature of 1,280 C. The furnace was then
left open till the temperature had fallen to about 1,2000 C., when
the metal was poured.
The door was open a good deal while the metal was at 1,1600 to
1,2800 C. Yet the metal loss was only 0.5 pound or 0.75 per cent,
as 66.1 pounds of ingot and 0.4 pound of shot were recovered.
HEAT L19.
In heats L19 to L22, inclusive, the charge was 70 pounds of scrap
yellow brass, 10 pounds of yellow gates, 5 pounds of scrap copper,
and 15 pounds of "kretz." The aim was to make a yellow brass con-
taining about 25 per cent zinc. In addition to the metal, 2 pounds
of salt and a double handful of charcoal were used on each heat.
Heat L19 began at 8 a. m. in a cold furnace with all the charge in
the furnace at the start, save about 30 pounds of scrap. After 30
minutes, when 19 kilowatt-hours had been used, rocking was started.
At 8.34, when 21.6 kilowatt-hours had been used, the rest of the
charge was put in and the salt added. The arc was off 5 minutes,
till 8.39. At 8.45 rocking was again begun and at 8.58, when 32
kilowatt-hours had been used, the temperature was 1,1150 C. This
575740--18----333
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Gillett, H. W. & Rhoads, A. E. Melting Brass in a Rocking Electric Furnace, report, 1918; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc12367/m1/35/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.