Melting Brass in a Rocking Electric Furnace Page: 38
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38 MELTING BRASS IN A ROCKING ELECTRIC FURNACE.
The total weight of the metallic materials charged was 106.1
pounds. From this 104.95 pounds of ingot and 0.70 pound of shot,
or 105.65 pounds in all, were recovered, showing a loss of 0.45 pound
or slightly less than 0.45 per cent.
HEAT L26.
Heat L26 was on a red-brass composition similar to that used in
heat L25. The original charge was 37.5 pounds of scrap copper,
21.5 pounds of red gates, 37.5 pounds of yellow chips, 2.0 pounds of
tin, and 2.5 pounds of lead, total 101.0 pounds. Most of the scrap
and gates were put in at the start, at 10.40 a. m. At 11.08 a. m.,
when 8 kilowatt-hours had been used, the rest of the charge, with some
charcoal, was put in. After 6 minutes, the arc was started again
and run till 11.35 a. m. when 21.2 kilowatt-hours had been used. The
temperature was 1,240 C., so 6.3 pounds of red gates was added,
lowering it to about 1,200 C.
The total charge was 107.3 pounds; 106.0 pounds of ingot and 0.7
pound of shot, or 106.7 pounds in all, were poured, showing a loss
of 0.6 pound or about 0.55 per cent.
HEAT L.27
At 11.45 a. m. about 60 pounds of a heat of 100 pounds of yellow
chips (25 per cent zinc) was put into the furnace, and left till 12.32
p. m., when the are was started. At 12.45, when 8.3 kilowatt-hours
had been used, the rest of the charge, with some common salt and
charcoal, was added. After being off 6 minutes, the are was run for 19
minutes, when 18 kilowatt-hours had been used. The temperature
was only 1,040 C. After a 4-minute interval the are was run again
for 6 minutes, till 1.20 p. m., when 21 kilowatt-hours had been used
and the temperature was 1,1000 C.
There were poured 98.2 pounds of ingot and 0.7 pounds of shot, or
98.9 pounds in all were recovered, with a loss of 1.1 pounds, or
1.1 per cent.
HEAT L28.
Heat L28, on 49.85 pounds of red brass chips with a zinc content of
10 per cent, was started at 1.35 p. m. with all the charge, including
charcoal, in the furnace. The arc was run until 2.01 p. m., when 12
kilowatt-hours had been used and the temperature was 1,2000 C.
In this heat 48.70 pounds of ingot and 0.65 pound of shot, 49.35
pounds in all, were recovered, indicating a loss of 0.5 pound or about
1 per cent.
SUMMARY OF RESULTS OF THE 28 HEATS.The results of the 28 heats are summarized in Table 1.
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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/m1/40/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.