In the world of precious metals, the separation of rhodium from platinum and palladium is a topic of significant interest. This process is not only fascinating but also crucial for various industrial applications. Here, we explore the methods and intricacies involved in this separation process.
The Challenge in Separation
Rhodium, platinum, and palladium, all part of the platinum group metals (PGMs), often occur together in nature and have similar physical and chemical properties. This similarity makes theirseparation challenging but essential, as each metal has unique applications due to its individual properties.
Initial Processing: Concentration of Ores
The journey to separate rhodium begins with the concentration of the ore. This involves crushing the ore and using flotation techniques to create a concentrate of PGMs.
Refining Process: Chemical Methods
Dissolution and Precipitation: The concentrate is dissolved in a mixture of hydrochloric acid and chlorine, converting all metals to their chlorides. Selective precipitation, using chemicals like ammonium chloride, can separate palladium from the mix.
AlCath Flux, Ablationskatheter
Solvent Extraction: Involves transferring the metals into an organic solvent. Specific chemicals are added to selectively extract platinum and leave rhodium in the aqueous phase.
Electrolytic Refining: Applied for further purification, where metals are deposited onto electrodes. Rhodium's unique electrochemical properties allow it to be separated at this stage.
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