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    12
    Rem Hlwn
    Feb 26, 2021

    Hello I have some questions about my palladium refining.

    in PGM Refining

    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.

    30 answers25 replies
    0
    2
    Sam
    Mar 02, 2021

    Dilute... 10-15% It will not precipitate, hopefully it in alreadny in metallic state and simply will not dissolve by the dilute acid.

    Rem Hlwn
    Mar 02, 2021

    @Sam Thank you very much I appreciate your help. I will now do a second batch but before the refining procces I am doing the recovery procces discribed in your article I think the pd will be more pure this way.

    0
    Sam
    Mar 02, 2021

    Do you mind showing us the starting material?

    0
    Rem Hlwn
    Mar 02, 2021

    @Sam It is from old rotate phone scrap.


    This is one out of many

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    1
    Sam
    Feb 27, 2021

    Hi Rem,

    There's a lot of missing information...

    What was the starting material?

    Are you sure it contains Palladium? How much?

    What other metals does it contains (soudns like Ni is present)?