The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1909-11-20
EDISOH'S IDEAS ARE
APPLIED TO. ORES
Zine, Lead and Iron Ores Sue
ccSSfuIly Concentrated and
Separated by Electricity.

The Utah society Of engineers held a
meeting Friday evening at tbc new
quarters at the Ncwhousc building. The
regular business consisted in the voting
in Of thrc new members. Il. l.. Kotch,
nm. associate professor OF engineering
at the state university; T. j. Pack,
professor of geology in the university.
and w, \. Richmond, employed al pres
cnt i'm the city engineer Office,
The programme Of the evening con.
sisted of Two papers. one on tho mag
netic concentration of ores, by f. :.
NacGregor. meIallurgist of The Huff
ElcctroSlatlc Separating company. and
second on reinforced concrete. by
the Nilladscn Brothers, architects Of the
city.
The discussion on orc concentration
proved Ia be extremely interesting in
view Of the fact that the methods are
new, only two Of the Huff plants be
ing in operation at present. one of
which IS at Midvaic, where il is used in
separating zinc from IRON and lead
The method Of separation IN brief. as
explained by Mr.. MacGrcgor, consists
IN allowing 4 feed Of concentrates con
tanning the mixed ores Of lead. iron and
zinc, to fall through the electric field
induced hy two plcCtrostatc electrodes
having Il potential difference of 10000
volts.
The PARTICLES of orc which are good
conductors, that is, the iron and lead,
arc drawn away from The original path
oi flow and are cut off from the ziuc.
thereby enabling the large amount of
ziUc, which WAS formerly lost. a. be
saved. The iron and lead are suHslfcd
iN, hp t,h ,nls 1. l.. al.
concentrates are shipped 10 Kansas To
the American Zinc Refining company.
Each of the llud machines used in the
|. =. Smelling mill Mt MiavalC has
from six 10 eight of the electrodes, and
the whole mill, which has capacity
of about forty tons a day, uses only
twcntynine horsepower.
The products from the HUFF machine
rs run in the mill Just cited, range
from 30 10 53 per cent zinc and , per
cent iron IN the zinc ores, and about 50
per cent iron and from per cent to
10 per cent zine in the iron ores.
In the paper, or reinforced concrete
Mr., Eilladscn treated the history Of
reinforced concrete, showing how its use
had grown until now sufficient tests
have been made to RELY on the data.
The best proportions to be used, accord
ing 70 Mr.. Nilladsen. are l;2;+.
The cement should be pure Portland
cement, the sand must be clean and
free from soil, and The gravel or crushed
stone is best If taken mt diameter OF
: inches. The relative values of differ
cnt Kinds of steel rods used for rein
forcing were discussed by the speaker,
who stated that the best form for gen
eral use is the plain, round rod of mild
steel,
After the reading Of the paper by Mr.
Villadsen, his brother took the lloor and
explained by diagram the action of
stresses applied to concrete beams
Prof L. b. Ketchum gave his expert.
euces in the use of rcinfo concrete
in railroad work, and followed its de.
vclopmcnt in this class of construction.
Prof Beckstrang showed the differ
ences of tensile strength as obtained
by the different kinds of rods used for
reinforcing.