The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1914-03-26
.LEACH|NC TESTS ARE
NEARLY COMPLETED
Nevada Douglas Has Found
Way to Clarity Copper
Sulphate Solutions.

The teaching experiments OF the Ne
Yada Douglas Copper company which hav
been conducted at Denver and at Lud
wig. Nov. are approaching completion
Concerning them the Boston office o. tn
attest report from Ludwig. which is. II
part. as follows:
While we have demonstrated fully
IN our experimental! plant at Denver
that the method used there is sue
cess on Nevada Douglas ores. and
that they can be treated by that
process at very low cost. We are not
yet satisfied by any means that thc
methods used here cannot bc very
greatly improved upon. In fact re-
cent investigations have brought 10
light new and important discoveries,
which. when applied in connection
with the work already accomplished.
Will aid very materially In reducing
the initial cost OF installation. as well
as giving us an increased efficiency In
the saving OF our copper values, ana
q material reduction In price per
pound of copper recovered.
For reasons best known TO the man
agement, IL would not be 10 the In
terest OF our company TO divulsc al!
the Information we have regarding
our teaching plans. For the benent OF
those Interested, however ] would say
that they have found a way TO treat
the sulphidc ores as well AS the oxides,
without the necessity OF giving them
n preliminary roast, and that i'll the
treatment of these Sulphidc ores all
the iron and sulphur In the ore Will
he obtained s by-products in the
form OF ferric oxide Cred paint and
sulphuric acid This ferrlc oxide will
have e ready market on the coast OF
at least cents a pound, while the
iIri ri sgr To-
tion Will be worth not less than $40
ton to the company. for the treat
ment of its oxidized ores. The value
OF tae by-products obtained should be
cost OF the sulphide ores. and should
enable us TO work ores running eH-
tremely low in copper content
Another. and perhaps the most I'M
poriant. result OF our Investigations
Il the fact that We have found way
of clarifying our copper sulphate solu-
tons. which should enable us to work
with the usual methods ordinarily en-
ployed In the copper refineries of tae
coast and precipitate our copper cleo
one-half cent per pound Of copper pre-
ciptated To those who are familiar
with the electrolytic precipitation OF
copper. The difficulties encountered in
rrecipitating from solutions contain
mated with iron salts will be appar-
ent and the possibilities OF the new
process readily appreciated when
say that We VIII be enabled TO remove
the iron entirely from the copper solu-
ton. and that all OF this iron will be
recovered as a marketab BILE product
The presence OF this Iron In tde cop
per solution has always been the
greatest interfering element In cleo
trolytic precipitation. and with this
element removed there Is nothing left
10 prevent our prccipitating the cop
per as chcaply as 1t can be done any
place. We are pushing the matter
Just as fast as We can, and The de-
lays are because we wish TO have the
very best possible plant when II Is
completed. Our experimental work Is
nearing completio and there are only
u few details yet 10 be worked out.