about platinum and more

[Dan72ccx]

Hi all
I have spoke with someone professional who do refining as business, when I spoke to hem about platinum and told hem how I do to expect hem corrected me so the answer was for get rid off nitric acid he recommended to me search for sodium ......... on Google what will kill the nitric any sugestion for ? I never have straight answer from hem
For the clianing gold he recommend to not take out from the filtrating funnel just keep in funnel and pour hot water, hydrochloric and ammonium in cycle when the gold stile in funnel as they do same way clianing as we are.
And gold can be done crystals same whey as we do the silver whey
Sry my engl.

 

[Dan72ccx]

Hi Stephen
Any suggestion what sodium they used ?

 

[butcher]

I use sulfamic acid as GSP suggested, but I also use GSP’s suggestion to limit free nitric acid by only using what you need to put values into solution with heat. This and using Harold’s trick of adding (or leaving a little free gold) really simplifies the aqua regia process.

http://en.wikipedia.org/wiki/Sulfamic_acid

http://reviews.homedepot.com/1999/100171510/16-oz-sulfamic-acid-cleaner-reviews/reviews.htm

 

[Dan72ccx]

Hi
No that is for the platinum catalytic process I am ask for, as no one recommended to use the urea to eliminate excess of nitric

 

[butcher]

:?:

I am a bit confused now.

of what the questions are.

urea I understand can give complications with the platinum group metals.