DE657256C - Process for the electrolysis of sulphate solutions, in particular alkali sulphate solutions - Google Patents
Process for the electrolysis of sulphate solutions, in particular alkali sulphate solutionsInfo
- Publication number
- DE657256C DE657256C DEI54377D DEI0054377D DE657256C DE 657256 C DE657256 C DE 657256C DE I54377 D DEI54377 D DE I54377D DE I0054377 D DEI0054377 D DE I0054377D DE 657256 C DE657256 C DE 657256C
- Authority
- DE
- Germany
- Prior art keywords
- electrolysis
- lead
- sulphate solutions
- silver
- solutions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
- C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
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)
Description
Verfahren zur Elektrolyse von Sulfatlösungen, insbesondere Alkalisulfatlösungen Die bei der Elektrolyse von Sulfatlösung en, insbesondere. Alkalisulfätlösungen, verwendeten Bleianoden besitzen den Nachteil, daß die Oberflächenschicht durch anodische Oxydation allmählich abgetragen wird, wobei sich auch eine Niederschlagung von Blei an der Kathode und eine Verunreinigung der kathodiscl abgeschiedenen Metalle ergeben kann. Zur Verhinderung dieser Erscheinung hat man bereits früher vorgeschlagen, Legierung en des Bleis mit geringen Mengen Silber (bis zur eutektischen Konzentration von etwa 2,5 % Silber) zu verwenden, denen zur Härtung des Bleis gegebenenfalls auch noch geringe.Mengen Arsen zugesetzt wurden.Process for the electrolysis of sulphate solutions, in particular alkali sulphate solutions The s in the electrolysis of sulfate solutions, in particular. Alkali sulfate solutions, Lead anodes used have the disadvantage that the surface layer by anodic Oxidation is gradually eroded, with also a deposition of lead at the cathode and contamination of the cathodically deposited metals result can. To prevent this phenomenon, it has been suggested earlier that Alloys of lead with small amounts of silver (up to eutectic concentration of about 2.5% silver), those for hardening the lead, if necessary small amounts of arsenic have also been added.
Bei der Durchführung der Elektrolyse von Alkalisulfatlösungen zwecks Gewinnung von Alkalilaugen und Schwefelsäure hat sich jedoch gezeigt, daß sowohl Anoden aus reinem Blei als auch solche mit einem geringen Silbergehalt eine laufende Gewichtsabnahme, bedingt durch Abschülferung von bei der Elektrolyse gebildetem Bleidioxyd, erfahren. Verwendet man dagegen eine Blei-Silber-Arsen-Legierung, so erfahren die Anoden im Laufe der Zeit eine Gewichtszunahme, indem sich nämlich das sich an ihrer Oberfläche bildende Bleidioxyd zu dicken, festen Schichten ansammelt. Diese Schichten werden im weiteren Verlauf so dick, daß sie auch bei geringfügiger mechanischer Einwirkung, selbst durch die an der Anode entwickelten Sauerstoffbläschen, abfallen.When carrying out the electrolysis of alkali sulfate solutions for the purpose of Extraction of alkaline solutions and sulfuric acid has been shown, however, that both Anodes made of pure lead as well as those with a low silver content have a running one Weight loss due to the peeling off of electrolysis Lead dioxide, experienced. If, on the other hand, a lead-silver-arsenic alloy is used, so the anodes experience an increase in weight over time, namely by the Lead dioxide that forms on its surface collects in thick, solid layers. These layers become so thick in the further course that they are even with minor mechanical impact, even through the oxygen bubbles developed at the anode, fall off.
Es, wurde nun gefunden, daß ein Verschleiß von Bleianoden durch Bleidioxydbildung bei der Alkalisulfatelektrolyse praktisch völlig unterbleibt, wenn man den Silbergehalt des Bleis über die eu tektische Konzentration von 2,5 % hinaus, und zwar zweckmäßig auf bis etwa 7,5 %, erhöht und gleichzeitig durch Kühlung der Anode in an sich bekannter Weise dafür sorgt, daß die Temperatur der Anode während des Betriebes sich stets unterhalb etwa 5o°C hält. Bei .dieser Arbeitsw eise wird ein völlig farbloser, klarer Anolyt erhalten.It has now been found that lead anodes wear out due to the formation of lead dioxide in the case of alkali sulphate electrolysis practically completely omitted if one considers the silver content of lead beyond the eutectic concentration of 2.5%, and expedient to about 7.5%, increased and at the same time known per se by cooling the anode Way ensures that the temperature of the anode is always constant during operation below about 5o ° C. This way of working becomes a completely colorless, clearer one Anolyte obtained.
Den Blei-Silber-Legierungen kann zwecks Härtung des Bleis auch Arsen zugesetzt werden; beispielsweise ist eine Legierung aus 96 % Blei, 3 % Silber und i % Arsen ebenfalls beständig.Arsenic can also be added to the lead-silver alloys for the purpose of hardening the lead be added; for example, an alloy of 96% lead, 3% silver and i% arsenic also resistant.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI54377D DE657256C (en) | 1936-02-21 | 1936-02-21 | Process for the electrolysis of sulphate solutions, in particular alkali sulphate solutions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEI54377D DE657256C (en) | 1936-02-21 | 1936-02-21 | Process for the electrolysis of sulphate solutions, in particular alkali sulphate solutions |
Publications (1)
Publication Number | Publication Date |
---|---|
DE657256C true DE657256C (en) | 1938-03-01 |
Family
ID=7193853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEI54377D Expired DE657256C (en) | 1936-02-21 | 1936-02-21 | Process for the electrolysis of sulphate solutions, in particular alkali sulphate solutions |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE657256C (en) |
-
1936
- 1936-02-21 DE DEI54377D patent/DE657256C/en not_active Expired
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