Melting Brass in a Rocking Electric Furnace Page: 34
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34 MELTING BRASS IN A ROCKING ELECTRIC FURNACE.
was a little cold, so after 3 minutes had been spent in opening the
door, taking the temperature, and closing and luting the door, the
are was started again and run till 9.08, when 35 kilowatt-hours had
been used, and the metal was at 1,1450 C. and was poured.
From the 100-pound charge 93.5 pounds of ingot and 2 pounds
of shot, 95.5 pounds in all, were recovered, giving an apparent loss
of 4.5 per cent.
HEAT L20.
At 9.23, with all the charge in except about 40 pounds of scrap, the
arc was started. At 9.51, when 12.7 kilowatt-hours had been used,
the rest of the charge and the salt were put in. After 6 minutes the
arc was started again and run till 10.21, when 24.2 kilowatt-hours
had been used and the metal was at 1,1450 C. From this run 95.15
pounds of ingot and 0.7 pound of shot, or 95.85 pounds in all, were
recovered, giving an apparent loss of 4.15 per cent.
HEAT L21.
Heat L21 was started at 10.37 a. m. with all the metal, except
40 pounds of scrap, in the furnace. At 10.59, when 10 kilowatt-
hours had been used, the rest of the metal and the salt were charged
and the are was started after being off 5 minutes. At 10.27, when 21
kilowatt-hours had been used, the temperature was over 1,2000 C.
and 5.3 pounds of gates was added to bring the temperature down to
about 1,175 C. before pouring. There were recovered 100.9 pounds
of ingot and 0.7 pound of shot, or 101.6 pounds in all, giving an
apparent loss of 3.55 per cent.
HEAT L22.
At 11.40 a. m. all the charge except 40 pounds of scrap was put
in and left without running the arc till 12.37, when the are was started.
At 1 p. m., when 7 kilowatt-hours had been used, the rest of the
charge and the salt were put in and at 1.04 the arc started again and
run till 1.27, when 18 kilowatt-hours had been used. The tempera-
ture was found to be 1,0500 C. After a 4-minute stop the arc was
run till 1.38, when 21 kilowatt-hours had been used, and the metal
was at 1,135 C. As a result, 95.15 pounds of ingot and 1.1 pound of
shot, or 96.25 pounds in all, were poured, giving an apparent loss of
3.75 per cent.
HEAT L23.
The next heat was on the dirty "kretz" alone. Fifty pounds of
this material, with some charcoal, was put in at the start, at 2.01 p. m.,
and was heated 37 minutes, when 15 kilowatt-hours had been used
and the temperature was 1,2100 C.
From this run 40.2 pounds of ingot and 1.1 pounds of shot, or 41.3
pounds in all, were recovered, showing a loss of 17.4 per cent. The
amount of slag was large.
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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/m1/36/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.