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Патент USA US2412500

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2,412,500
Patented Dec. 10, 1946
‘ Fao'rn
STATES
rfLora'ngiiz'?g'osutrmns
PATENT
once orriics
' ‘I .
Arthur H. Fischer, New York, N. Y.
No Drawing. I ‘Application April 21, 1944,
Serial N0. 5.2305
6' Claims. (or. 209-106)
1:
.
, Among the compounds found to be most e?ecr'
tiveare those comprising on the xanthogen side
This invention-relates to th concentration of
ores-and has for an object the provision of vcertain
alkyl radicals containing-?ve or morecarbon
atoms and comprising on the formate side the.
improvements’ in concentration operations. More
particularly, the invention contemplates the pro
vision Qfrcertain improvements ‘in ?otation op
erations;
' ethyl radical.
Bpecii'ic compounds whlchhave
been foundto be highly effective include amyl;
xanthogen ethyl formate and hexyl xanthogen;
A further object of the invention is
to provide certain improvements in ?otation
ethyl formate.
V
.
,
V
In practicing a method or process of the in
The invention is based on my discovery that
vention, a neutral, acid or alkaline circuit may
10
alkyi xanthogen formates which are unsymmetri
be employed. The ?otation reagents may be em
methods or processes.
'
I
calwithrespect to the alkyl radicals are‘ highly
played with particular advantage in alkaline .cir
e?ective ?otation reagents which may be em
ployed advantageously . as
cults.
mineral collecting
.
minerals and metallic minerals and in froth ?ota
tion operations designed for the concentration
.' of both oxidized ores and sulphide ores.
posed on the xanthogen side as indicated by the I
20
following structural formula: ‘
s
.
signed for the concentration of both non-metallic
_Ali<yl- xanthogen/ fcrmates found most suitable
for-use in ?otation concentration processes ‘are
those in which the larger alkyl radicals are dis
J
The ?otation reagents may be employed ad
vantageously in froth ?otation operations‘ de
agents in" conjunction with frothing agents and
conditioning agents in froth ?otation operations.
The.
reagents can be employed with partlcularladvan
tage in froth'?otation operations‘ designed for
the concentration of_ copper sulphide ores and
o
nodes-lion’
other sulphide ores.
‘
'
The following examples vlllustratetthe advan
tages of, the reagents andprocesses of the inven- >
in which R and R.’ are alkyl radicals and R con 25 tion over reagents and processes employed here
tains the greater number‘of carbon atoms.
tofore.
I have found that the alkyl xanthogen f ormates
Example I
which are unsymmetrical with respect to the
alkyl radicals may be employed more advan 30 Humbolt copper sulphide ore of the following
tageously in various ?otation circuits than those
which are symmetrical.
Thus, for example, a
symmetrical compound comprising relatively
small alkyl radicals, such as ethyl xanthogen
ethyl formate, tends to break down and become
ineffective in an alkaline circuit. Compounds
having larger alkyl radicals substituted for or
composition with respect to copper was ground
in water to form three separate aqueous pulps
‘which were subjected to separate froth ?ota
tion operations in the presence of the reagents
indicated with the production of concentrates
and tailing products of the analyses indicated:
instead of one or both of the ethyl radicals have
greater stability in alkaline circuits. A com
Test No.
pound having the same larger radical substituted 40
for or instead of the ethyl radicals on both the
xanthogen side and the formats side may be of
such stability as to be practically ineffective as
a ?otation agent. A compound having a larger
radical on only the xanthogen side has desired
stability without decreased ?otative properties.
1
2
Heads percent Cu ...................... ..
1.86
Concentrates gercent Cu _______________ __
14.43
Tails percent
u _______________________ ._
3
1. 86
16. 1
1.07
. 289
1.86
17. 2
.277
REAGENTS, POUNDS PER TON
I have found that a compound comprising on the
Xanthogen side an alkyl radical containing five or
more carbon atoms and comprising on the for
mate side an alkyl radical containing a‘lesser
60
number of carbon atoms generally may be em
ployed with great advantage as a notation agent.
___________________________________ __
Pine oil ________________________________ __
Ethyl xanthogen ethyl formats...
_ ._
6
6
.14
. 02
Amyl xnnthogen-ethyl formats _________________ . .
6
.14
. 14
.............. ._
. 02
Hexyl xlmthogen ethyl formats _________________________ _.
______ _ _
. 02
2,412,500
3
4
Example II
in water to form three separate aqueous pulps ‘
which were subjected to separate froth ?otation
operations in the presence of the reagents indi
cated with the production of concentrates and
in water to form two separate aqueous pulps
which were subjected to separate froth ?otation
operations in the presence of the reagents indi
cated with the production of concentrates and
tailing products of the analyses indicated:
tailing products of the analyses indicated:
1
Test“
2
a
10
Test No'
Heads percent Cu ...... -.
1
Tails percent Cu _______ _.
Concentrates percent Cu.
Holds
percentpercent
Ou___' ______
__
Concentrates
Cu._._
L12
16.84
silspercent Cu __________ ..
.68
2
1', 12 15 v
16.48
.18
REAGENTS,
POUNDS PER TON
‘
Lime ___________________________________ n
Pine oil ...................... ..
Ethyl
mnthosen ethyl rormate_
REAGENTB, POUNDS PER TON
8
..
Amy] xauthogen amyl formate_
Lime ____________________________________________ __
12
Ethyl xanthogen ethyl fol-mate . _ _ _ _ _
_
Plneoll ........ .; ............ __
_ ._
_ _ . _ ..
.14
.02
Amyl‘mmgen “hymrmate -------------------- --
12
.14
'
8
8
.
2o ' Amyl xanthogen ethyl formate_ . ._
...... _.
Iclaim:
.
.
.
.
'02
1. The method of concentrating sulphide ore
x‘\
which comprises subjecting the ore in the form
Example III
of a pulp to a froth ?otation operation in the
25 presence of amyl xanthogén ethyl formats.
2. The method of concentrating sulphide ore
which comprises subjecting the ore in the form of
a pulp to a froth ?otation operation in the pres
30
08,81
ence of hexyl xanthogen ethyl formate.
3. The method of concentrating copper sui
phide ore which comprises subjecting the ore in
the form of a pulp to a froth ?otation operation
in the presence of amyl xanthogen ethyl formate.
4. The method of concentrating copper sul
35
phide ore which comprises subjecting the ore in
the form of a pulp to a froth ?otation operation
Heads percent Cu .............. __
Concentrates gercent Cu _______ ._
Tails percent
u _______________ __
in the presence of hexyl xanthogen ethyl formate.
5. The method of concentrating sulphide ore
which comprises subjecting the ore in the form
of a pulp to a froth ?otation operation in the
presence of a compound of the group consisting
of amyl xanthogen ethyl formate and hexyl
xanthogen ethyl formate.
Ethyl starters-5555mm;
Hexyl xanthogen ethyl iormate
6. The method of concentrating copper sul
phide ore which comprises subjecting the ore in
the form of a pulp to a froth ?otation operating
Example IV
sisting of amyi xanthogen ethyl formate and
Copper Queen copper sulphide ore of the follow
hexyl xanthogen ethyl formate.
ing composition with respect to copper was ground 50
ARTHUR H. FISCHER.
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