Hi dears, following the Hcl p.a attack with O² injected, I noticed that the attack was being very slow as the days went by, so I added drops of H2O2 v.200 and quickly noticed an increase in the silver particles that are insoluble in Hcl p.a. with concentrated H2O2, with I filtered all the dissolved threads and washed them until acid neutralized, separating the mixture a little like the one in the photo. What remains is this blackened chloride solution where we have a lot of palladium. I thought about drying these particles and melting them at 550°C with NaHSO4 or KHSO4 for a few hours in the hope of dissolving them and precipitating a Rh hydroxide, washing until neutralized and dissolving in H2SO4, repeating until an acceptable purity and perhaps then reducing to Rh powder. contaminated. When they can, if the masters want to guide me, this is a great store of knowledge, I intend to help the group with a donation.
