Cementation (metallurgy) (original) (raw)
Zementation ist ein Begriff der Metallurgie, der für verschiedene Verfahren angewandt wird: * die elektrochemische Abscheidung von Metallen aus Lösungen, * die Oberflächenbehandlung von Metallen durch Einbringen von Fremdmetallen * die Verringerung oder Erhöhung des Kohlenstoffgehaltes von Metallen, * die Erhöhung des Feingoldgehalts.
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| dbo:abstract | Zementation ist ein Begriff der Metallurgie, der für verschiedene Verfahren angewandt wird: * die elektrochemische Abscheidung von Metallen aus Lösungen, * die Oberflächenbehandlung von Metallen durch Einbringen von Fremdmetallen * die Verringerung oder Erhöhung des Kohlenstoffgehaltes von Metallen, * die Erhöhung des Feingoldgehalts. (de) Cementation is a type of precipitation, a heterogeneous process in which ions are reduced to zero valence at a solid metallic interface. The process is often used to refine leach solutions. Cementation of copper is a common example. Copper ions in solution, often from an ore leaching process, are precipitated out of solution in the presence of solid iron. The iron oxidizes, and the copper ions are reduced through the transfer of electrons. The reaction is spontaneous because copper is higher on the galvanic series than iron. Cu2+(aq) + Fe(s) → Cu(s) + Fe2+(aq) This was a historically useful process for the production of copper, where the precipitated solid copper metal was recovered as flakes or powder on the surface of scrap iron. Cementation is used industrially to recover a variety of heavy metals including cadmium, and the cementation of gold by zinc in the Merrill-Crowe process accounts for a substantial fraction of world gold production. (en) En hydrométallurgie, la cémentation est une réaction d'oxydoréduction permettant d'extraire du métal à partir d'un sel, en le faisant réagir avec un métal. (fr) Mionathrú an chisil dhromchlaigh ar mhiotal tríd an miotal a théamh is a phacáil in ábhar ar leith a idirleathfaidh isteach sa mhiotal. An bealach is ársa chun cruach a dhéanamh, an t-iarann a théamh is é pacáilte i ngualach. (ga) |
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| gold:hypernym | dbr:Precipitation |
| rdf:type | owl:Thing yago:WikicatMetallurgicalProcesses yago:Abstraction100002137 yago:Act100030358 yago:Activity100407535 yago:Event100029378 yago:Procedure101023820 yago:PsychologicalFeature100023100 yago:YagoPermanentlyLocatedEntity |
| rdfs:comment | Zementation ist ein Begriff der Metallurgie, der für verschiedene Verfahren angewandt wird: * die elektrochemische Abscheidung von Metallen aus Lösungen, * die Oberflächenbehandlung von Metallen durch Einbringen von Fremdmetallen * die Verringerung oder Erhöhung des Kohlenstoffgehaltes von Metallen, * die Erhöhung des Feingoldgehalts. (de) En hydrométallurgie, la cémentation est une réaction d'oxydoréduction permettant d'extraire du métal à partir d'un sel, en le faisant réagir avec un métal. (fr) Mionathrú an chisil dhromchlaigh ar mhiotal tríd an miotal a théamh is a phacáil in ábhar ar leith a idirleathfaidh isteach sa mhiotal. An bealach is ársa chun cruach a dhéanamh, an t-iarann a théamh is é pacáilte i ngualach. (ga) Cementation is a type of precipitation, a heterogeneous process in which ions are reduced to zero valence at a solid metallic interface. The process is often used to refine leach solutions. Cementation of copper is a common example. Copper ions in solution, often from an ore leaching process, are precipitated out of solution in the presence of solid iron. The iron oxidizes, and the copper ions are reduced through the transfer of electrons. The reaction is spontaneous because copper is higher on the galvanic series than iron. Cu2+(aq) + Fe(s) → Cu(s) + Fe2+(aq) (en) |
| rdfs:label | Zementation (de) Cementation (metallurgy) (en) Stroighniú (ga) Cémentation (hydrométallurgie) (fr) |
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