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Languages : en
Pages : 20
Book Description
South African Patent : ZA725489 : Improvements in Or Relating to the Separation and Purification of Platinum Group Metals and Gold
Author: South African Patent : ZA725488 : Improvements in Or Relating to the Separation and Purification of Gold
Author: South African Patent : ZA735634 : Improvements in the Recovery of Values from Ores Containing Platinum Group Metals Or Gold
Author: South African Patent : ZA746550 : Improvements in the Recovery of Values from Ores Containing Platinum Group Metals and Gold
Author: Improvements in the Purification and Separation of the Platinum Group Metals and Gold
Author: Gerhardus OverbeekSouth African Patent : ZA725498 : Improvements in Or Relating to the Separation and Purification of Iridium
Author: German Patent : DE3711801 : Separation and Purification of Platinum Group Metals and Gold by Precipitation Using Substandard Thiourea(s), Separation and Recovery
Author: Improved Process for the Separation and Purification of Platinum Group Metals and Gold
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The invention provides a process for the separation and purification of platinum, palladium and/or gold by means of solvent extraction. A high molecular weight tertiary or quaternary amine solvent is used to extract the anionic chloro complexes from the aqueous feed. Any secondary PGM's in the aqueous feed are hydrolysed to complexes which are neutral or cationic. This conditioning is done by boiling 3 to 4 hours below pH 3. The loaded solvent is scrubbed with acid. Palladium and/or gold is stripped with thiourea solution and perchlorite solution is used to strip the platinum but thiocyanate can also be used. Alternatively dilute perchlorite can be used to strip platinum, strong perchlorite for palladium and the gold is then stripped with sodium carbonate solution. Further claims specified the use of resins instead of solvents but no resin details specified. Solvent used most was 5% alamine 336 in solves 150. Other claims included precipitating palladium in strip solution with ethylene and platinum with hydrogen.
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