Help with Rhodium

[slouma37]

Hi all,

 

[Lino1406]

To hot sulphuric acid, HCl or NaCl should be added under hood of course

 

[slouma37]

To hot sulphuric acid, HCl or NaCl should be added under hood of course

Hi Lino, of course safety first ! but i need a detailed process to follow or explanation why nothing works for me ?. Thanks

 

[nickvc]

Lino is telling you to add Hcl or salt to hot sulphuric but definitely under a hood to dissolve the rhodium.

 

[slouma37]

Lino is telling you to add Hcl or salt to hot sulphuric but definitely under a hood to dissolve the rhodium.

 

[nickvc]

No problem, you sometimes need to read some replies two or three times to get the point.

 

[goldsilverpro]

I would surely be careful when adding anything to hot sulfuric and would do it very slowly in increments. This goes double for chlorides or any liquid. Wear a full face shield and long rubber gloves, if you have them. Stir gently after additions. If adding liquids, don't pour them into one spot - move your additions around.

 

[slouma37]

Thank you

 

[goldandsilver123]

You will need to grind the rhodium powder together with the pyrosulfate, then heat in muffle oven in a covered beaker at 550ºC for at least 1 hour.

The maximum conversion I got was 80%.

Here are some pictures:
Ground Rhodium powder with pyrosulfate (K2S2O7)

Small Batch 1


Small Batch 2

 

[slouma37]

You made my day

 

[slouma37]

Hi all

 

[nickvc]

I’m sure you are aware of the dangers of working with PGMs but a warning to others the salts are very toxic and need careful handling and very good lab practice !

 

[slouma37]

I’m sure you are aware of the dangers of working with PGMs but a warning to others the salts are very toxic and need careful handling and very good lab practice !

Absolutly right nickvc !.
I profit to thanks all of who helped me out here. 8)