The Roanoke times. [volume] (Roanoke, Va.) 1890-1895, 1890-10-22

s.1...
at that time under the most capable
management. ~
Actual cost of roasting and handling
per ton OF ore:
ROASTING ORE.
1886. 1887. 1883.
Labor, including
car and topman so. OOS3 O.O673 SO.OS1t
supplies. ........ O.0024 O.O032 O.OO91
Coal. ............ O.O725 O.O75O O.O74S
- S0.1632 so, 1856 so. 1850
Clum, per ton.... 200 2.l0 2.25
Average cost, 50. 1000.
About one ton of culm used to 30 tons
of ore.
HANDLING AND WHARF EXPENSES.
1856. 1887. 1883.
Labor, including
engineer and
tcamster. 800. .S0.O514 SO.O430 so. o72O
supplies and coal 0.0177 O.Ol32 O.O169
Team ......... 0.0040 O.OOG2
REPAIRS etc.. 0.0O46 o.Oo25 O.OO29
SO.0731 $0.O636 so. O9SO
average .'........ .S0.O70
Average total cost. $500 O.23OO
VI VII VI OIc treated.
The third item remains to be deter
mined, namely, the cost of concentra-
ton, including royalty on the process.
Ihls would be cents per ton for con-
ccntratlng and 25 cents royalty: Taking
as an example ore ''II' in the foregoinG
list, the cost of the concentrated ore
would be as follows:
Cost of ~ ton ore 50 -
roastlng. 30
concentration and royalty. a7
80. IS
at yield of As per cent. iron, this is
q cents unit, or, in sound numbers.
600 to the ton.
To determine the extent to which the
other constituents of the ore were
affected, tested several of the ores, of
winch two examples will suffice. They
gave the following results:
gre H. Raw: Concen. Tailings.
1roh' 20.3O 1852 5.2I
Phosphorus, o.12 O.3o O.O9
Ore NJ.
Iron, 3131 4S.S7 5oo
Sillca' 2O.25 $500
-h"hgahese, 2.20 lis
The surprisingly small amount of fer
rous oxide in the magnetizcd ore leaves
the question, whether magnetization is
wholly due to its presence, very uncer-
tain. In the list of ores given, G., carry
ing oo per cent. of iron, which would be
presumably high in ferrous oxide. con-
talns but 3.07 per cent. of ferrous oxide.
In some cases the raw ore contains near
~ this amount. If the reduction caused
by roasting were the sole cause, it would
be reasonable to expect the exterior of
the particle to be the magnitized portion.
but Jumps of the roasted ore having
been broken, small pieces. carefully
selected from the inside of the lumps.
showed In some cases even more strongly
marked magnetic properties.
a number of trials with the anhydrous
oxide both red and specular hematites.
conducted In precisely the same manner.
gave no evidence whatever of result
ing magnetization. Crystallized spcci
mems remained likewise unaffected.
While the porous character of the brown
hematite would permit permeation by
reducing the gases, it is difficult to I'M
derStand how such minute deoXidiZation
could magnetic it so strongly More
over, the magnetization appears to be
permanent. Samples which | have kent
lor over year in contact with air have
preserved the quality unimpaired.
Cooling the red-hot oxide in water af-
1ects 1T somewhat, but it is still capable
OF responding through that medium to
the attraction of magnetic field.
The phenomenon seems to be connect
ed with the expulsion of the combined
water, and 1 think is largely depend
ent on it's physical separation from the
ore During the processes some of the
oxides glow quite strongly. The raw
oxide, when heated to redness in
closed glass tube, gives off small
amount of carbonic acid with it's water,
but is only feebly magnetic. There is
no apparent evidence that ferrous oxide
Is produced by decomposition of tho
water. The Only statement now posi-
bic is that the hydratcd oxides of iron
become magnctized at a red heat in con
tact with carbon or carbon dioXide.
1T may be worth noting that the
ldea OF employing a magnetic
separator in process for ..manu.
featuring cast steel and malleable
iron of superior and uniform quality
directly from ores" was announced some
years ago. The curious supposition on
which it was based was, that when i'm
pure ores" are brought to white heat
III furnace (thcrcby producing metallic
spongc), they can be separated from
pure ores" ry the simple mechanism
OF revolving magnets" Some of the
"noXious elements" thus to be eliminat-
ed were Titanic acid. vanadic acid,
chronic acid, sulphuric acid, sulphur
phosphorus, phosphoric acid, silicic acid,
SilicatpS - Tho ,ocu1ti,,r ,,,oI =, M ,...,,.