I did almost all steps from this website about palladium precipitation. I added HCl to my material of palladium on a hot plate and started adding nitric acid slowly. The soloution started getting green. When the material dissolved i cooled it for a day and i started heating it again and added additions of HCl and the mixture got dark green. I made bunch of Stannous chloride tests and i think that it is positive for palladium because the colour was yellow green. When i neutralized the soloution i let it for one more day. After that a blue- green crystals were formed so i filtered them. After that I made a concentrated soloution of amonium chloride and I added it to my palladium soloution. Some precipitate was formed so i filtered it. But the precipitate was not yellow or orange. Later I make a mixture of manganese oxide and HCl to produce chlorine. I introduced the chlorine to the green mixture of palladium and then some white green precipitate was formed. My question is am I doing everything correctly and why my soloution is green and if it is wronge how can i fix it.
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Gold-N-Scrap
Recovery & Refining of Precious Metals
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If you add nitric acid you can not easily precipitate Palladium use hydrogen peroxide instead of nitric acid
Thanks
Reza
+16043512882
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Nikel tuzu gibi görünüyor.Sam daha iyi bilir.klor gazı fokurdayınca PDCl2 solüsyonundan kırmızı PD tuzu düşer.sizin yeşil düşmüş!
Hi again. I succesfully precipitated everything from the solution. But I think I have nickel and copper in the precipitate. How can I remove them from the palladium?
Hi @Sam. I am processing another palladium solution. The stannous chloride is very positive it turns dark when I add 1 drop pd solution and 3 drops sncl2. The colour of the solution is green. When I add more HCl to neutralize the HNO3 the solution turn very dark green. I let it cool down from the hot plate and I added a spoon of zinc powder then the solution start fizzing very much and a blueish foam appears and brown gases releases. I do not know why. I decided to add aluminium foil and the same thing happens and nothing precipitates. I put the solution on a hot plate and the blue foam dissappeared and the solutiom got lighter. When I added HCl it got again dark green. I think it did not neutralized enough and if how to neutralize it completly? Should I use urea powder? And when I neutralize it what should I do to get the dark pgm powder as described in this site? I hope you will help me. Thank you in advance.
Hi @Sam. Three days ago I started processing gold so I got gold fingers from RAMs and I put them in nitric acid. The gold platings started seperating from the fingers and the soloution turned blue-green color. I decides to test it with stannous chloride and it got strong positive for palladium. So how should I process the liquid after filtering it?Should I precipitate with zinc powder or I should do something else? Thank you!
Hi @Sam if you want I will give you my number to contact better in viber or whatsapp if you want?
Your test seems very dilute... Borderline negative. See here wht an SnCl2 looks like with a 1g/L palladium control solution.
Hi @Sam. Today I filtered the precipitate and I put ammonia soloution then I added HCl and I put the soloution on a hot plate to evapurate the liquid. Then it evapurated and a yellow powder settled on the bottom. I am thinking of making the refining process again ( dissolve in AR then neutralizing, precipitating with ammonium chloride, precipitating with chlorine etc) or to calcine the powder as described in this site?
This is the yellow precipitate which formed
This is the sncl2 test
This picture is after the neutralization
What it is then and how to fix it?
Hi @Sam. I wanted to tell you what is happening with the process. So I neutralized the pd soloution on a hot plate by adding HCl. After that I let it for a night and today I made saturated ammonium chloride soloution and I added it to the soloution. I filtered it and after that I bubbled chlorine gas into the soloution and a precipitate started to form and I let it for a night now. Is everything as it should be?
This is the precipitate after the chlorine bubbling
@Sam
Hi @Sam Copper...? Hm... Yes the test is green yellow color when I put it on a paper. When I put a sample of the pd soloution on a spoon and when I add the sncl2 a dark color forms then it is gone. And no I do not have DMG. Maybe there is copper and pd?
Hi @Sam Copper...? Hm... Yes the test is green yellow color when I put it on a paper. When I put a sample of the pd soloution on a spoon and when I add the sncl2 a dark color forms then it is gone. And no I do not have DMG. Maybe there is copper and pd?
@Sam please answer
@Sam