Lewiston inter-state news. [volume] (Lewiston, Idaho) 1905-1906, 1905-12-22

current OF 81 volts and 1000 amperes
was passed through the furnace ana
tne arc established. The furnace waa
ststenr1ed with q mixture Of maGnatafe.
COKE and lime. This consisted Of so
pounds OF magnetic, obtained from the
saho at Hammond Station. near Asto-
ria. Ore, at the mouth Of Columbia
river: A pounds Of Fairfax coke.
wnach contained about Is per cent of
ASH; ana - pounds Of lime. About 30
pounds or this charge was slowly intro
duced into the furnace and within an
nour there was tapped from the fur
mace 20 pounds Of steel. which con-
tained per cent of iron and s. per
cent Of titanic acid.
On the following day the furnace was
again heated and filled with mixture
similar to that used on the first run,
except that 1t contained less lime, Steel
was successfully cast twice. making,
forthat days run Of two hours a pro-
duct Of 30 pounds Of steel from 800
pounds Of iron ore. This gives the fur
mace capacity. ON a continuous run.
of l440 pounds in "a hours.
Composition Of Charge.
The iron ore fed to the furnace
showed the following percentages of
magnetic oxide. of titanic acid, man.
ganese and undetermined matter:
Analysis Of Columbia River sand
concentrates.
res "a 1906
IoI ......... .............. 1910
MnOZ ................... 2.45
Silica, moisture and undeter-
mined matter ............. 2.49
1t will be noted that the heat was
sufficient to keep the entire Stag in a
fluid state whether much or little IT,
tanic acid was present 1t is evident
also that no titanium went into the
iron. Instead of the steel usually OBJ
tanned, the charge of October 20, as
shown by the analysis Of that day.
gave what was practically pig iron.
eiags Obtained from Furnace A.
The slags first obtained consisted Of
fused iron silicates, fused oxide of iron.
and silicate of titanium. Later in the
experiments these slags grew lighter in
color and in specific gravity. 1t ba-
came possible also to lessen the guam
tity Of Stag produced. which was UNI
duly large owing to the great quantity
of ash in the COAL The coke used
showed on analysis II per cent of ash.
1t is difficult to procure in this local
ity coke that is well adapted to metal
lurgical needs.
Furnace B.
Experiments with the small furnace
having been successful, 1t was thought
desirable to build a larger furnace, with
thicker walls, in which higher tempe
natures might be obtained and main
tanned. An iron plate 2 inches thick
feet wide, and feet long was there
fore procured and laid upon two
courses of fire brick, to form the base
Of a furnace, on which was set. 9
wrought-iron cylindrical shell one.
quarter Of an inch thick. 5 feet IF
diameter, and feet high. This was
lined with fire brick, the bottom having
the usual lining of one course Of car.
bon electrode bricks inches in diam.
eter. Two carbons clamped together
with a water jacketed head or claml
formed the electrode for introducing
the current. The voltage was run up a,
high as possible-that is from - K
80 volts, the limit Of the current OBJ
tainable over the wires. In all respect
except these mentioned. this secont
furnace is identical with the first.
Iron ore from Aptos, Bay Of Monte
rey, California was smelted In this fur
mace on November 10. This iron or