SG172087A1 - Electrolytic recovery device for gold or silver - Google Patents
Electrolytic recovery device for gold or silver Download PDFInfo
- Publication number
- SG172087A1 SG172087A1 SG2011042603A SG2011042603A SG172087A1 SG 172087 A1 SG172087 A1 SG 172087A1 SG 2011042603 A SG2011042603 A SG 2011042603A SG 2011042603 A SG2011042603 A SG 2011042603A SG 172087 A1 SG172087 A1 SG 172087A1
- Authority
- SG
- Singapore
- Prior art keywords
- cathode
- silver
- gold
- barrel
- electrolytic
- Prior art date
Links
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 75
- 239000004332 silver Substances 0.000 title claims abstract description 75
- 238000011084 recovery Methods 0.000 title claims abstract description 54
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 49
- 239000010931 gold Substances 0.000 title claims abstract description 49
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000012212 insulator Substances 0.000 claims abstract description 26
- 238000007872 degassing Methods 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 241000206607 Porphyra umbilicalis Species 0.000 claims 1
- 239000010936 titanium Substances 0.000 description 10
- 239000002351 wastewater Substances 0.000 description 9
- 229910000510 noble metal Inorganic materials 0.000 description 8
- 238000007747 plating Methods 0.000 description 7
- -1 polyethvlene Polymers 0.000 description 6
- 238000005868 electrolysis reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 239000002198 insoluble material Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/20—Electrolytic production, recovery or refining of metals by electrolysis of solutions of noble metals
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
- C25C7/06—Operating or servicing
- C25C7/08—Separating of deposited metals from the cathode
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
To make it possible to easily strip off gold or silver electrodeposited on a. cathode in an electrolytic recovery device5 for gold or silver so that a barrel cathode (3) is able to be repeatedly used. In an electrolytic recovery device for gold or silver comprising an electrolytic layer (1), a control device (2), an anode (4), and a barrel cathode (3), an insulating cap is attached to the barrel cathode (3) around the entire circumferential lower10 edge thereof, and a plurality of band insulators are detachably attached in one position in a longitudinal direction on the outer circumferential surface of the barrel cathode (3) with a space ensured between the band insulators, so that the electrodeposited gold or silver is able to be easily stripped off from the barrel15 cathode by removing the band insulators.
Description
ELECTROLYTIC RECOVERY DEVICE FOR GOLD OR SILVER
The present invention relates to devices for electrolytic recovery of gold from gold-containing sclution and devices for electrolytic recovery of silver from silver-containing solution, and in particular to an electrolytic recovery device for gold or silver that enables easy stripping of gold or silver oo electrodeposited on the surface of a harrel cathode.
As a method for recovering gold from gold plating liguid, gold-containing waste water resulting from the recycling of electronic components, and so forth, an electrolytic process has been widely implemented. Further, as a method for recovering sllver from silver plating liguid, silver-containing waste water such as fixing photographic liguid, or the like, an electrolytic process has been widely implemented.
As a device for electrolytic recovery of silver from silver-containing solution, there has been known a silver recovery device that has, for example, an electrolytic cell, an anode placed in the electrolytic cell, a cathode detachably placed around the anode in the electrolytic cell, and electric connectors for the cathode and anode, being placed outside the electrolytic cell, in which the electrolytic cell has an electrically conductive contact surface and a holding portion for holding a deformable portion of the cathode relative to the contact surface so as to astablish electric connection from the cathode connector to the cathode (see, e.g., Patent Document 1).
As a device for electrclytic recovery of silver from silver-containing solution, there has also been known an electrolytic recovery device comprising, for example, an electrolytic cell, an anode placed in the cell, a reference electrode placed in the cell, a cathode detachably placed in the cell (the cathode having an inner surface opposed To the anode and an outer surface cpposed to the reference electrode), and means 16 for reducing deposition of silver on the cuter surface of the cathode (see, e.g., Patent Document 2).
As a device for electrolytic recovery of gold from gold-containing sclution such as gold plating waste water or the like, there has been disclosed a device for electrolytic recovery of gold from gold plating waste water or cleaning water used in gold plating, using, for example, a Ti rotating cathode. In this device, in order to prevent stripping and dropping of electrodeposited gold, an oxide film is removed from the front and rear surfaces of the Ti rotating electrode, using hydrogen fluoride, hydrochloric acid, or nitric-hydrcfluoric acid (see, =.g., Patent
Document 3).
Further, there has been known a recovery device for recovering valuable metal from cyan-containing waste water by supplying cyan waste water containing valuable metal such as gold or the like into an electrolytic cell having an anode made of insoluble material, and then electreolyzing while rotating the cathode plate to cause valuable metal such as geld or the like to be deposited on the surface z of the cathode plate (see, e.g., Patent Document 4).
However, in an electrolytic recovery device using a barrel cathode such as is described in the above mentioned Patent Documents 1 and 2, mounting and removing of the barrel cathode with respect to the electrolytic cell is troublesome as the cathode material itself is thin and the cathode has many cut-outs formed along the upper edge thereof. :
Moreover, the deposited silver may be stripped off from the cathode, which causes short-circuiting between the anode and the cathode, promoting consumption of the anode and hindering continuation of electrolysis.
Further, although a noble metal electrolytic recovery device disclosed in Patent Document 3 is considered capable of preventing noble metal from being stripped off and dropping from a Ti rotating 12 electrodes but keeping the noble metal closely adhered to the Ti rotating electrode, the noble metal electrolytic recovery device has a problem in that, as the noble metal electrodeposited on the
Ti rotating electrode is closely adhered over the entire surface of the electrode from the upper edge to the lower edge thereof, the noble metal cannot be easily stripped off from the Ti rotating electrode even when a spatula or a hammer is used, for repetitive use of the Ti rotating electrode.
Anoblemetal recovery device disclosed in the above described
Patent Document 4 differs from an electrolytic recovery device £25 according to the present invention in that a disk cathode is used, rather than a barrel cathode. .
The above described disk cathode has a problem in that, as noble metal such as gold, silver or the like, 1s densely electrodeposited on the front and rear surfaces of the disk cathode,
The electrodeposited noble metal cannot be easily stripped off from the cathode even when a spatula or a hammer is used.
Prior Art Document
Patent Documents
Patent Document 1: Japansse Patent Laid-open Publication No. © Hei6-240483
Patent Document 2Z: Japanese Patent Laid-open Publication No.
HeiB-92782
Patent Document 3: Japanese Patent Laid-open Publication No.
Helll-92985
Patent Document 4: Japanese Patent Laid-open Publication No.
Heil(-18074
Problems to be Solved by the Invention
The present inventicn aims to provide an electrolytic recovery device for gold or silver, using a barrel rotating cathode made of stainless steel, titanium, or the like, the electrolytic recovery device being improved such that the gold or silver electrodeposited on the cathode can be easily stripped off so that the barrel rotating cathode can be repeatedly used.
Means for Sclving the Problems
The present inventors have accomplished the invention described below in crder to solve the above described problems.
That 1s, according to the present invention, there are
: provided the following devices.
{l) An electrelytic recovery device for gold or silver, comprising an electrolytic layer, a control device, an anode, and a barrel cathode, wherein the barrel cathode has an insulating cap attached thereto along an entire circumferential lower edge thereof and a plurality cof band insulators detachably attached in one position in a longitudinal direction on an outer circumferential surface therecf with a space ensured between the band insulators, so that electrodeposited gold or silver is easily stripped off from the barrel cathode by detaching the band insulators. (2) The electrolytic recovery device for gold or silver described above (1), wherein an upper portion of the barrel cathode may be a lid having a degassing hole formed therson.
(3) The electrolytic recovery device for gold or silver described above (1) or (2}, wherein the insulating cap and the band insulators may be made of plastic or rubber.
(4) The electrolytic reccvery device for gold or silver described above (1) to (3), wherein the band insulators may be detachably attached by a screw in one position in the longitudinal direction on the cuter circumferential surface of the barrel cathode.
(2) The electrolytic recovery device for gold or silver described above (1) to (4), wherein the anode may be placed on an outer side of the barrel cathode placed in the electrolytic cell.
{6) The electrolytic recovery device for gold or silver described above (1) to (5), wherein gold or silver electrodeposited on a surface of the barrel cathode may be stripped off in a barrel shape by removing the screw fixing the band insulators and removing the band insulators.
> According to the present invention, employment of a specially prepared barrel cathode enables easy stripping and recovery of gold or silver deposited on the barrel cathode from gold or silver electrolytic recovery liquid. Further, the barrel cathode can be repeatedly used after the gold or silver is stripped off therefrom and recovered.
Fig. 1 is a perspective view showing one embodiment of an electrolytic recovery device for silver according to the present invention;
Fig. 2 is a perspective view of a barrel cathode in the electrolytic recovery device shown in Fig. 1:
Fig. 3 1s a perspective view of the barrel cathode in the : electrolytic recovery device shown in Fig. 1, the cathode being upside down; and
Fig. 4 is a perspective view of electrolytic silver stripped off from the cathode.
BEST MODE FOR CARRYING OUT THE INVENTICN
25h In the following, the present invention will be described in further detail referring to the diagrams. [First Embodiment]
A case of recovering electrolytic silver, using an electrolytic recovery device for gold or silver according to the present invention, will be described.
Fig. 1 is a perspective view of an electrolytic recovery device for silver according to the present invention, and Fig. Z is a perspective view of a barrel cathode of the electrolytic recovery device shown in Fig. 1. In consideration of workability, economy, and so forth, a barrel cathode 3 having a diameter of 250 mm and a height of 370 mm is used.
As shown in Figs. 1 and 2, an electrolytic cell 1 has a control device 2 formed integral thereto for current control. At the middle inside the electrolytic cell 1, the barrel cathode 3 is fixed by a screw 13 to a cathode fixing bar 10 secured to the electrolytic cell 1 so that the barrel cathode 3 rotates around the cathode fixing bar l0asanaxis. After completionof silver deposition, thebarrel cathode 3 can be easily detached from the electrolytic cell 1 by removing the screw 13. Further, an anode 4 is provided opposed to (facing) the outer circumference of the barrel cathode 3. In this embodiment, as shown in Fig. 1, four anodes £4 are provided surrounding the barrel cathodes 3 in four directions.
The present invention 1s mainly characterized by an arrangement which enables easy stripping of the silver deposited on the barrel cathede 3 and the barrel cathodes 3 prepared such that the deposited silver will not drop from the cathode during electrolysis.
That is, the barrel cathode 3 of an electrolytic recovery device for silver according to the present invention has a lid 11 for covering the upper surface thereof, as shown in Fig. 2. The lid 11 has a plurality of degassing holes 12 formed thereon and an opening formed at the center thereof for fixing the barrel cathode 3 tec the cathode fixing bar 10 by the screw 13.
As shown in Fig. 3, the bottom part of the barrel cathode 3 is open with no lid provided to the lower surface of the barrel cathode 3, and an insulating cap 7 1s attached around the entire circumferential lower edge of the barrel cathode 2. :
A plurality of band insulators 6 are detachably attached by screws 2 in one position in the lengitudinal direction on the outer circumferential surface 5 of the barrel cathode 3 with a space in-between.
In a case where the band insulators 6 are attached to be continuous with no space in-between, the deposited silver will be stripped off from the cathode with the band insulators 6 as a boundary and will drop during electrolysis. Therefore, ensuring the space 8 is important. That is, the space 8 prevents the silver deposited arcund the barrel cathode 3 from being stripped off. The space 8 1s ensured in one position in the first embodiment, though the space 8 may be ensured in two or more positions. The space 3 is preferably between 1 mm and 10 mm wide, and more preferably . between 3 mm and 7 mm wide. A space of 1 mm wide or smaller is not preferable as silver may be stripped off during electrolysis, and a space of 10 mm wide or larger is also not preferable as the silver will not be easily stripped off.
Lccording to the present invention, material for the barrel cathode 3 may include, e.g., titanium, stainless steel, and the like, and that for the anode may include mesh titanium coated with platinum or platinum alloy.
According to the present invention, material for the insulating cap 7 and the band insulator 6, which are provided on the barrel cathode 3 to facilitate stripping of the silver deposited orn the bkarrel cathode 3, may include, e.g., polyethvlene, polypropylene, polycarbonate, plastic including nylon and polyester, and the iike, and rubber, such as natural rubber, polyurethane rubber, nitrile rubber, silicon rubber, and so forth.
In the following, recovery of silver from silver-containing waste walter, using an electrolytic recovery device for silver according to the present invention, will be described. Waste water targeted by the electrolytic recovery device is mainly used silver plating liguid discharged from a plating plant and recovery liquid after use in dissolving and stripping off silver from electronic compenents and so forth.
Initially, a polyethylene insulating cap 7 is attached to the barrel cathode 3 around the entire circumferential lower edge thereof. Then, polyethylene band insulators ¢ are fixed to the barrel cathode 3 by the screws 9 in two positions in the longitudinal direction on the outer circumferential surface 5 of the barrel cathode 3. In the fixing, a space 8 of bh mm wide is ensured between : the band insulatcors 6 such that the band insulators 6 remain separated, as shown in Fig. 2. The thus prepared barrel cathode 3 1s fixed to the cathode fixing bar 10 of the electrolytic cell 1 by the screw 13.
Thereafter, silver recovery waste water 14 is filled in the electrolytic cell 1 and the control device 2 is turned on so that silver contained in the waste water is deposited on the barrel cathode 3 through electrolysis. Accordingly, electrolytic silver is deposited in the space 8, so that the electrolytic silver, being separated along the polyethylene band insulators 6, remains continuous thanks to the electrolytic silver deposited in the space 8. As a result, the silver is not stripped off and does not drop from the cathode.
Then, the barrel cathode 3 1s taken out of the electreclytic cell 1 and the screws 9 fixing the band insulators © are removed to remove the band insulators 6. With the above, the deposited electrolytic silver 16 can be easily stripped off from the barrel cathode 3, as shown in Fig. 4. Fig. 4 shows a portion 17 {electrolytic silver deposited in the space) of the barrel electrolytic silver 16 stripped off, the portion 17 being deposited in the space 8 and then cut. [Second Embodiment]
A second embodiment relates to an electrolytic recovery device for gold. The above description on an electrolytic recovery device for silver in the first embodiment can be similarly applied to an electrolytic recovery device for gold simply by reading “silver” in the description as “gold”. Thus, further description is omitted here to avoid duplication.
With employment of a specially prepared barrel cathode, an electrolytic recovery device for gold or silver according te the present invention enables easy stripping and recovery of gold or silver deposited on a barrel cathode from gold or silver electrolytic recovery liquid, and thus achieves efficient recovery of geld or silver.
That is, wider industrial applicability can be ensured.
Further, as the barrel cathode can be repeatedly used after stripping off and recovery of gold cr silver, wider industrial applicability can be ensure also in view of material saving.
Claims (5)
- CLAIMS i. An electrolytic recovery device for geld or zgilver, comprising: o an electrolytic laver; a control device; an ancde; and a barrel cathode, wherein the barrel cathode has an insulating cap attached thereto } along an entire clrcumferential lower edge thereof and a plurality of band insulators detachably attached in one position in a longitudinal direction on an outer circumferential surface thereof with a space ensured between the band insulators, so that electredeposited gold or silver 1s easily stripped off from the barrel cathode by detaching the band insulators.
- 2. The electrolytic recovery device for gold or silver according to claim 1, wherein an upper portion of the barrel cathode is a iid having a degassing hole formed thereon.
- 3. The electrolytic recovery device for gold or silver according to claim 1 or 2, wherein the insulating cap and the band insulators are made of plastic or rubber. Z5
- 4. The electrolytic recovery device for gold or silver according to any one of claims 1 to 3 wherein the band insulators are detachably attached by a screw in one position in the longitudinal direction on the outer circumferential surface of the barrel cathode.
- 5. The electrolytic recovery device for gold or silver according tc any one of claims 1 to 4, wherein the anode is placed on an outer side of the barrel cathode placed in the electrolytic cell.a. The electrolytic recovery device for gold or silver according to any cne of claims 1 to 5, wherein gold or silver electrodeposited on a surface of the barrel cathode 1s stripped off in a barrel shape by removing the screw fixing the band insulators and removing the band insulators.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008314464A JP4397961B1 (en) | 2008-12-10 | 2008-12-10 | Silver electrolytic recovery equipment |
| JP2009266176A JP4472021B1 (en) | 2009-11-24 | 2009-11-24 | Gold electrolytic recovery equipment |
| PCT/JP2009/070622 WO2010067828A1 (en) | 2008-12-10 | 2009-12-09 | Electrolytic recovery device for gold or silver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SG172087A1 true SG172087A1 (en) | 2011-07-28 |
Family
ID=42242815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SG2011042603A SG172087A1 (en) | 2008-12-10 | 2009-12-09 | Electrolytic recovery device for gold or silver |
Country Status (4)
| Country | Link |
|---|---|
| MY (1) | MY158210A (en) |
| SG (1) | SG172087A1 (en) |
| TW (1) | TWI412628B (en) |
| WO (1) | WO2010067828A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5852916B2 (en) * | 2012-04-03 | 2016-02-03 | アサヒプリテック株式会社 | Precious metal recovery method |
| CN106011945A (en) * | 2016-06-16 | 2016-10-12 | 东莞市盛德电解设备科技有限公司 | Electrolytic gold extraction machine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5329126B2 (en) * | 1974-01-24 | 1978-08-18 | ||
| IT1035181B (en) * | 1974-04-08 | 1979-10-20 | Hydrospace Ind Inc | EQUIPMENT AND PROCEDURE FOR ELECTROLYTICALLY RECOVER SILVER FROM PHOTOGRAPHIC AND SAURITE SOLUTIONS |
| JPS52128611U (en) * | 1976-03-25 | 1977-09-30 | ||
| JPS52128611A (en) * | 1976-09-04 | 1977-10-28 | Hideo Mizuno | Execution method of slab offshore |
| JPS62161981A (en) * | 1986-01-08 | 1987-07-17 | Showa Denko Kk | Manufacture of electrolytic iron |
| TWM336956U (en) * | 2008-02-15 | 2008-07-21 | Waste Recovery Technology Inc | Metal electrolysis recycling apparatus |
-
2009
- 2009-12-09 WO PCT/JP2009/070622 patent/WO2010067828A1/en active Application Filing
- 2009-12-09 SG SG2011042603A patent/SG172087A1/en unknown
- 2009-12-09 TW TW98142085A patent/TWI412628B/en active
- 2009-12-09 MY MYPI2011002617A patent/MY158210A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| TWI412628B (en) | 2013-10-21 |
| MY158210A (en) | 2016-09-15 |
| TW201030188A (en) | 2010-08-16 |
| WO2010067828A1 (en) | 2010-06-17 |
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