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Патент USA US2128548

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Aug. 30, 19.38.
v c. 8. WHITE
2,128,548
PROCESS FOR RECCVERY OF METALS FROM SCRAP AND METALLURGICAL RESIDUES
Filed ‘July 25. 1937
H1)" or’. Qiv/z/gen
v $521,905}
NITRIC
ACID
Waltz/uh ,dcicz Old‘ 262'
SUPPLY
TANK
.z'zzzaazanm'wicéd
-
9
Patented Aug-30,1938
I .} 2,128,548
UNITED STATES PATENT OFFICE
PROCESS
SCRAP AND
FOR METALLURGICAL‘
RECOVERY OF METIALS
RESIDUES '
Clarence B. White, Philadelphia, Pa. _
Application July 23,1937, Serial No. 155,323
7 ".1 Claim.
(Cl. 204-45)
This invention relates to an economical method may be used in succession. The tin is recovered
of recovering metals such as copper, tin, lead and ' as a precipitate of metastannic acid while the
zinc from scrap material, metallurgical 'by-prod~ solution is drawn off and electroiyzed by a low
_ nets and residues containing metals in the form voltage current in the electrolytic depositing‘
5
of alloys.
,
‘ tank 8.
The primary object of the present invention is
to eliminate the partial furnace re?ning _which is
usually employed at therpresent time in metal
recovery and to greatly reduce the expense of
10 recovery.
_,
-
'
5
The electrodes 9 are preferably of insoluble or
substantially insoluble material. The copper is
deposited on the cathodes as pure electrolytic
copper, the lead being deposited on the other
electrodes in the form of black oxide of lead. 10
The scrap materials and commercial residues
ordinarily contain copper, tin, lead and zinc‘together with impurities such as nickel, antimony,
iron etc. -My,invention is more speci?callydi’ 15 ,rected to the recovery of the metals by leaching
After the removal of the copper and lead, the
spent acid from the electrolytic tank is conveyed ..
to the spray head iii of the uppermost condenser
section “c.
The ‘nitric oxide gas from the leaching tower 15
and electrolysis. Heretofore the use‘ of nitric
3, together with the oxygen from the air or OXY?
acid as the leaching agent or solvent by which
to obtain a solution of all of the metals, has not
been commercially feasible on account of the
20 great expense of the acid employed. I have devised a process in which the nitric oxide result-
gen supply, pass into the lower part of the lowest
scrubbing section MiL of the condenser and per
colate upwardly through the mass of broken
stone I5 or other suitable rubble, to thereby com
blue with the spent acid entering through the
ing from the reaction‘df the acid and the metals
spray heads l6 andlthus replenish the supply of
of the scrap material is recovered to repeatedly
nitric acid.
replenish the leaching agent in a continuous
25 cycle.
, ~
~
,
current'relationship to the ?ow of nitric oxide gas 25
The accompanying drawing is a schematic il-
' 30
,
The recycling of the spent acid in counter
constitutes a ‘continuous cyclic renewal of ‘the
lustration of apparatus for practicing my process
nitric acid solvent. _ This is of very great impor
of recovering metals from scrap or metallurgical
by-products.
tance and .is in fact, a-vitail controlling factor
in the' practical recovery of metals from metal
lurgical by-products by acid solvents on a com- 30
In carrying out my process the granulated ma-.
terial is placed in a leaching tower 3 where it is
subjected, to‘a continuous shower or spray 4 of
nitric acid from a suitable supply tank 5, 150-‘
gether with a suitable supply of, oxygen or air.
35 The reactions which take place are as follows:--
mercial scale.
_ ,
I claim:
A continuous cyclic process for treating scrap
metal and metallurglcalby-product materals con- '
tainlng tin, copper and lead to recover said metals, 35
which comprisesthe cyclic use of nitric acid as
a solvent, leaching said materials with-said sol- - _
vent with the evolution of nitrous oxide, passing
_,_
the nitrous gases to an absorbing tower, con
40
,
.
. tinuously'passing the solution from the leaching 40
In each case, it will be observed, nitric oxide
(NO) is evolved. In vorder to‘ convert this into
nitric acid, the addition of oxygen is' necessary.
The reaction in oxidizing nitric oxide to form
45 nitric acid is substantially as follows:—
'
__
I
' 2NNg+2£6Ifg§O
m0
3Ifmg_I_IN—O 21246 H (a)
2*
50
3+
‘
+ 2
tank to an electrolyzing tank, with the provision
of a ?ltering tank between the leaching and elec
trolyzing tanks to precipitate the tin as metas-em
tannic acid, electrolyzing the copper and lead
from the solution and continuously passing the 45'
spent acid from the electrolyzing tank to the
absorbing tower in counter-current relationship
.
The solution drawn from the bottom of the
tower is decanted in the ?ltering tanks 1, which
tothe nitric oxide resulting from‘ the leaching operation to regenerate the nitric acid for use in
the leaching operation.
,
CLARENCE B. WHITE. .
50
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