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Biscuits Catylitic Converter Project - Page 5

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  1. #81
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    The 165.3 grams of cat cons were put into a leach at ambient temperature taking up palladium into solution as rhodium and platinum require a hot leach.



    After drying the particulate from the filter that did not go into solution,I have 91 grams platinum/rhodium along with some trash in the jar and 74 grams of palladium in solution in the beaker waiting for my DMG to arrive.



  2. #82
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    Have a new mentor a chemist previously employed at a cat refining facility, he recently told me that sulfuric acid would precipitate palladium from a multi species liquor.

    Decided to give it a try, removed a few ounces of pregnant leach from the main batch, added the sulfuric and not much happened until I put the beaker on some heat evaporating some of the liquid off.

    When an equilibrium was obtained the palladium began to fall out of solution as a sulfide, first image is the dry sulfide, second image is sulfide in water third image is incinerated sulfide.

    The incinerated sulfide in the last image is high grade palladium.


    [IMG][/IMG]

    [IMG][/IMG]

    [IMG][/IMG]

  3. #83
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    Thought I could save myself some needless work and not have to spent time cutting open the cats and just use a engine cleaning wand to remove the wash coat.

    You can obviously see some opaque color in the water, the process did remove a bit of the precious metals from the comb, that comb is virgin.

    It's been determined that a pressure washer with about 1200 psi would do the job, I'm not going to make that investment.

    [IMG][/IMG]

  4. #84
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    Quote Originally Posted by Ohio Scrapper View Post
    You'll have to admit, he doesn't give up!
    After removing the wash coat had sent in some of the comb for an assay to see how efficient my process's were at reclaiming the precious metals.

    The assay told me that I'm only getting about 60 percent of the wash coat, I've run out of ideas on how to improve the recovery rate so maybe it is time to toss in the towel - call it quits.

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  6. #85
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    Quote Originally Posted by blackgold12 View Post
    Diesel cats are predominately palladium


    Diesel cats are predominately Platinum.

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  8. #86
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    PdO under reduction, ended up with 34.8 grams palladium.


  9. #87
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    Another batch of palladium oxide, thought I would share a few images of the chemistry taking place.




  10. #88
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    This is an assay from from the concentrates ( precious metals wash coat ) removed from the cats, contains a lot of junk elements. Palladium content is reasonably high.

    Assay also tell me what my mistakes were.

    [IMG][/IMG]


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