Cementation Cathodic precipitation of a metal ion of a metal from solution by passing the solution over a more anodic (less noble) metal Cu 2+ +2e = Cu (cathodic precipitation Fe = Fe 2+ + 2e (anodic dissolution) Cementation is less selective than gaseous reduction
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Cementation Cathodic precipitation of a metal ion of a metal from solution by passing the solution over a more anodic (less noble) metal Cu 2+ +2e = Cu.
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Cementation
Cathodic precipitation of a metal ion of a metal from solution by passing the solution over a more anodic (less noble) metal
Cu2+ +2e = Cu (cathodic precipitation
Fe = Fe2+ + 2e (anodic dissolution)
Cementation is less selective than gaseous reduction
Isolation techniques
Ion exchange: organic resins on to which either cations or anions have been loosely bounded
Solvent extraction: organic compounds – ethers, esters, ketones- provide high solubility of some metallic and complex metal ions
Reverse osmosis: concentration of metal ions by passage of water from a dilute to a more concentrated solution through a semipermeable membranes
Electrowinning
Electrowinning of a metal is based on the electrolysis of aqueous solutions or melts of metal salts with insoluble anode