Patent US3558730A successfully refreshed from Google Patents.
Patent US4028199A successfully refreshed from Google Patents.
US4028199A
Expired / Lapsed
US
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Method of producing metal powder
Assignee: VAN ASPERT BEHEER BV
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Filing: 1975-07-30
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Granted: 1977-06-07
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Expires: 1995-07-30
Abstract
Abstract A metal powder e.g. copper or zinc, is produced from a dilute aqueous solution of the metal by subjecting the dilute aqueous solution to electrolysis in a cell having a rotating cylinder cathode and in accordance with the equation: I = KCV.sup.x where I is the current density, K is a constant for a given cell, C is the concentration of metal ion in aqueous solution, V is the peripheral velocity of the rotating cylinder cathode and x = 0.7 to 1.0. A diaphragm cell is preferably used. Dilute aqueous solutions treated include mining liquors and viscose rayon plant effluent. This invention relates to metals and is particularly concerned with the recovery or extraction of metals in powder form by electrolytic means.
Inventors
- 👤 Frank Stanley Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:57
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/46; C02F1/461; C02F1/467; C02F1/4676; C02F1/4678; C02F1/46104; C02F1/46109; C25; C25C; C25C5/00; C25C5/02; C25C7/00; C25C7/007; C02F2001/46119; C02F2001/46123; C02F2001/46152; C02F2201/00; C02F2201/46; C02F2201/461; C02F2201/46105; C02F2201/46115; C02F2201/46155; C02F2209/00; C02F2209/06
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
94 words
A method of producing a metal powder from a dilute aqueous solution of the metal which solution has a low concentration of the metal ion, said method comprising the steps of subjecting the dilute aqueous solution of the metal to electrolysis in a cell having a rotating cylinder cathode, the current density of the cathode being proportional to the peripheral speed of the rotating cylinder cathode to the power of a number between 0.7 and 1.0 whereby the metal is deposited as a powder on the cathode, and recovering metal powder from the cathode.
Claim 2
Independent Claim
94 words
A method of producing a metal powder from a dilute aqueous solution of the metal which solution has a low concentration of the metal ion, said method comprising the steps of subjecting the dilute aqueous solution of the metal to electrolysis in a cell having a rotating cylinder cathode, the current density of the cathode being proportional to the peripheral speed of the rotating cylinder cathode to the power of a number between 0.7 and 1.0 whereby the metal is deposited as a powder on the cathode, and recovering metal powder from the cathode.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1 in which the dilute aqueous solution contains from 2 to 10,000 parts per million of metal ion.
Claim 4
Dependent Claim
52 words
A method as claimed in claim 1 in which the electrolysis is carried out in accordance with the equation: I = KCV.sup.x where I is the current density, K is a constant, C is the concentration of metal ion in aqueous solution, V is the peripheral velocity of the rotating cylinder cathode.
Claim 5
Dependent Claim
34 words
A method as claimed in claim 3 in which C = 2 to 10,000 parts per million, I = 1 mA/cm 2 to 10 Amps/cm 2 and V = 1 cm/sec to 10,000 cms/sec.
Claim 6
Dependent Claim
40 words
A method as claimed in claim 4 in which C = 2 to 1,000 parts per million, I = 1 mA/cm 2 to 1 Amp/cm 2 and V = 10 cms/sec to 2000 cms/sec and x = 0.8 to 0.93.
Claim 7
Dependent Claim
28 words
A method as claimed in claim 1 in which the electrolysis is carried out in a cell having a diaphragm separating the cathode from the anode or anodes.
Claim 8
Dependent Claim
19 words
A method as claimed in claim 6 in which the diaphragm of the cell is an ion exchange membrane.
Claim 9
Dependent Claim
26 words
A method as claimed in claim 1 in which the metal powder produced is separated by physical means from the other materials contained in the cell.
Claim 10
Dependent Claim
18 words
A method as claimed in claim 1 in which the cell voltage is from 2 to 250 volts.
Claim 11
Dependent Claim
18 words
A method as claimed in claim 1 in which the cell voltage is from 2 to 20 volts.
Claim 12
Dependent Claim
21 words
A method as claimed in claim 1 in which the temperature of the electrolyte is from 20° C to 80° C.
Claim 13
Dependent Claim
17 words
A method as claimed in claim 1 in which the dilute aqueous solution is a mining liquor.
Claim 14
Dependent Claim
48 words
A method as claimed in claim 1 in which the dilute aqueous solution is a solution of a metal selected from the group consisting of copper, zinc, chromium, manganese, iron, cobalt, nickel, ruthenium, rhodium, palladium, silver, cadmium, indium, tin, iridium, platinum, gold, lead, uranium and rare earth metals.
Claim 15
Dependent Claim
20 words
A method as claimed in claim 1 in which the dilute aqueous solution is viscose rayon plant effluent containing zinc.
Claim 16
Dependent Claim
23 words
A method as claimed in claim 14 in which the effluent is that obtained by spinning viscose into sulphuric acid containing zinc salts.
Claim 17
Dependent Claim
24 words
A method as claimed in claim 14 in which the concentration of zinc in the effluent is from 1000 to 10,000 parts per million.
Claim 18
Dependent Claim
18 words
A method as claimed in claim 14 in which the electrolysis is carried out using an aluminium cathode.
Claim 19
Dependent Claim
18 words
A method as claimed in claim 14 in which the electrolysis is carried out in a diaphragm cell.
Claim 20
Dependent Claim
18 words
A method as claimed in claim 18 in which the diaphragm of the cell is an ion-exchange membrane.
Claim 21
Dependent Claim
21 words
A method as claimed in claim 18 in which the pH of the effluent during electrolysis is between 4 and 7.
Claim 22
Dependent Claim
21 words
A method as claimed in claim 20 in which the pH of the effluent is adjusted by the addition of alkali.
Claim 23
Dependent Claim
14 words
A method as claimed in claim 21 in which the alkali is caustic soda.
Claim 24
Dependent Claim
13 words
A method as claimed in claim 20 in which the effluent is buffered.
Claim 25
Dependent Claim
19 words
A method as claimed in claim 23 in which the effluent is buffered by the addition of sodium acetate.
Claim 26
Dependent Claim
17 words
A method as claimed in claim 15 in which sulphuric acid is also recovered from the effluent.
Claim 27
Dependent Claim
28 words
A method as claimed in claim 25 in which the recovered zinc is dissolved in the recovered sulphuric acid to form a solution for use in spinning viscose.
Claim 28
Dependent Claim
90 words
A method as claimed in claim 1 in which, the dilute aqueous solution is a solution of copper and the electrolysis is carried out in accordance with the equation: I = KCV.sup.x where I, the current density, is from 1 mA/cm 2 to 1 Amp/cm 2 ; K is a constant; C, the concentration of copper in the aqueous solution, is from 2 to 1,000 parts per million; V, the peripheral velocity of the rotating cylinder cathode, is from 10 cms/sec to 2,000 cms/sec; and x is 0.8 to 0.93.
Claim 29
Dependent Claim
99 words
A method as claimed in claim 1 in which the dilute aqueous solution is a solution of zinc maintained during electrolysis at a pH between 4 and 7, the electrolysis being carried out in accordance with the equation: I = KCV.sup.x where I, the current density, is from 1 mA/cm 2 to 1 Amp/cm 2 ; K is a constant; C, the concentration of zinc in the aqueous solution, is from 2 to 1,000 parts per million; V, the peripheral velocity of the rotating cylinder cathode, is from 10 cms/sec to 2,000 cms/sec, and x is 0.8 to 0.93.
Claim 30
Dependent Claim
22 words
A method as claimed in claim 1 in which the cathode is made of steel coated with the metal to be produced.
Claim 31
Dependent Claim
26 words
A method as claimed in claim 1 wherein the concentration of metal ion in the aqueous solution is in the range of 2 to 1000 ppm.
Claim 32
Dependent Claim
19 words
A method as claimed in claim 1, wherein the said power is a number between about 0.8 to 0.93.
Claim 33
Dependent Claim
26 words
A method as claimed in claim 31 wherein the concentration of metal ion in the aqueous solution is in the range of 2 to 1000 ppm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |