Hoke's Alternative for Precipitating Palladium using DMG

[benign01]

Great forum BTW. Should be a membership fee!!. I expect to pay for good info so I will make a donation after I've got Xmas out the way.

I have two questions on the above method.
1/ If I decide to use his method does the excess nitric have to be expelled first a la Hoke . I am trying to avoid this step due to professional time commitments just interfering with this batch.
2/ What temperature would the resulting powder melt at ? Assume I am a Hoke novice but not complete beginner.
Thank you in advance

 

[9kuuby9]

it's "her" method not his. And a good donation would be to educate yourself trough the already provided information here on the forum.

 

[benign01]

Ok Thank you. What a great forum! But I have looked and can't find the answers to the specific questions I asked.

 

[9kuuby9]

Try using this search engine; http://goldrecovery.us/forum_search.asp

 

[benign01]

Not a problem, but I want to be able to pay for downloads. I'm in Europe. Can you share the link?

 

[Lou]

You don't want the nitric acid higher than 3-4 M and want the precipitation done at room temperature, well-stirred, and allowed to ripen (preferably over 8-10 h).

Higher temperatures and excess nitric acid will oxidize the DMG part of the Pd complex, leading to low assay values.

It's common to use the DMG as a coarse separation, then digest into aqua regia and then do instrumental analysis.

 

[benign01]

Thanks Lou. Very helpful info and answering my first question.