Purplesquish
Member
I am processing about 100 grams of relay contact. 80% of them are gold/palladium contacts from T-Bar relays, according to the data sheet. The remaining 20% are mixed gold plated contact that I assume are mostly silver.
Processing was pretty standard. Hot nitric leech, followed by AR for the gold. The odd thing I ran into is that after dissolving the gold in the AR, I was left with some metal in my beaker that I wasn’t expecting. The metal in question will not dissolve in hot Nitric or hot AR. Looking at it, I would guess there is 0.5-1.0 grams of this metal left over, which seems relatively high considering I started with 100 grams of contacts.
Any ideas on what this may be and how I can go about identifying the material. Thanks!
Processing was pretty standard. Hot nitric leech, followed by AR for the gold. The odd thing I ran into is that after dissolving the gold in the AR, I was left with some metal in my beaker that I wasn’t expecting. The metal in question will not dissolve in hot Nitric or hot AR. Looking at it, I would guess there is 0.5-1.0 grams of this metal left over, which seems relatively high considering I started with 100 grams of contacts.
Any ideas on what this may be and how I can go about identifying the material. Thanks!
