New AR Recipe?

[nicknitro]

Hi all,

Looking for advice from the chemists here.

I currently buy a mixed acid concrete etcher, which it's chemical make-up is not too specific as to percentages, but they are listed as 1. Water 2. Phosphoric acid 3. Nitric Acid.

This chem is fairly expensive, and I currently use it for small jobs I feel it is more effective than poorman's nitric.

I have a question about the use of this as AR. The wiki for phosphoric says when NaCL is added to Phosphoric, a salt is formed, as well as HCL. I wonder if the percentage is enough to be the 4:1 ratio recommended for AR solutions. If this were possible, it may be useful for easily stored, available AR. I had a hard time finding HCL for a while, and Nitric is a hard one too. Maybe this process could help someone, if it is plausible.

Nick

 

[nicknitro]

MSDS,

The MSDS for this is pretty vague as well. I see why they don't list the percentages of each acid. The nitric can range from 15-35% as well as the phosphoric from 15-35%. HMMM, I wonder why the large differences in amounts? Are they less obligated to be precise as this chemical is used for prep work of concrete?

I also assume phosphoric is cheaper, but not as cheap as water. LOL

Nick

 

[Lou]

You can get HCl from salt and phosphoric acid. You get practically any acid from distillation with phosphoric.

Distilling a mixture of phosphoric and nitric acids will give you pure nitric acid with phosphoric remaining in the retort.

Lou

 

[nicknitro]

Lou,

Thank you for the info. I have a distillation unit, it is stainless. However the cooling unit is a copper tube based design. I am also wary of distilling my own nitric. I don't really wanna mess around with the fumes.

Thanks again,

Nick

 

[philddreamer]

Lou, so adding some phosphoric to nitric or AR process won't hurt?
I ask because I found 40% peroxide @ a beauty supply store & it contains some phosphoric in it. I used a bit & notice no problems... but then again, I'm a noob! :roll:
I just finished refining 30GM of 14 karat in AR w/some of that peroxide. I expected 16.9 of 24k, & recovered just that. I droped w/SMB. It's the first run & there's gold foils in the light tan powder & on the side of the coffee pot.

Phil