Reduction by boiling

[shannon flagg]

Newbie here,
Just a curious question. When reducing the solution down by heating it for a while, whats the result for acid and water quantity proportions. For example: 400ml HCL + 100ml HNO3 (AR) + 3ml H2SO4 + 200ml H2O (ice cubes) will reduce to what if I boil down the solution to 200ml? I understand the nitric will disappear making this process advantageous preventing having to use urea.

 

[Yggdrasil]

Newbie here,
Just a curious question. When reducing the solution down by heating it for a while, whats the result for acid and water quantity proportions. For example: 400ml HCL + 100ml HNO3 (AR) + 3ml H2SO4 + 200ml H2O (ice cubes) will reduce to what if I boil down the solution to 200ml? I understand the nitric will disappear making this process advantageous preventing having to use urea.

Welcome.
First, we almost never use AR 3-1 since it almost always leads to excessive amounts of Nitric in the end product.
We use HCl + enough Nitric to do the job (we add the Nitric in small amounts until it is done).
Next we never boil solutions containing values as the liquid can spurt out causing losses.

If you evaporate the liquid to getvrid of excess Nitric, you have to evaporate to a syrupy consistency and then add HCl again. If it still gives brown fumes do it again.

The acids will evaporate during this process.

 

[Yggdrasil]

Newbie here,
Just a curious question. When reducing the solution down by heating it for a while, whats the result for acid and water quantity proportions. For example: 400ml HCL + 100ml HNO3 (AR) + 3ml H2SO4 + 200ml H2O (ice cubes) will reduce to what if I boil down the solution to 200ml? I understand the nitric will disappear making this process advantageous preventing having to use urea.

Here are some links to study.
Pay special attention to Hokes book, the safety section and waste treatment.

We ask our new members to do 3 things.
1. Read C.M. Hokes book on refining jewelers scrap, it gives an easy introduction to the most important chemistry regarding refining.
It is free here on the forum: https://goldrefiningforum.com/phpBB3/viewtopic.php?f=54&t=19798
2. Then read the safety section of the forum: https://goldrefiningforum.com/forums/safety.47/
3. And then read about "Dealing with waste" in the forum: https://goldrefiningforum.com/threads/dealing-with-waste.10539/

Suggested reading:
https://goldrefiningforum.com/forums/the-library.101/
https://goldrefiningforum.com/threads/when-in-doubt-cement-it-out.30236/
https://goldrefiningforum.com/threa...le-read-this-before-you-post-about-ore.33333/

Video section: https://goldrefiningforum.com/threa...our-visual-learning-members.35185/post-379931

List of abbreviations: https://goldrefiningforum.com/threads/a-glossary-of-common-terms.21242/post-219169

Forum rules is here.
https://goldrefiningforum.com/threads/gold-refining-forum-rules.31182/

 

[shannon flagg]

Thanks, awsome! Waste reduction is my primary quest.

 

[4metals]

Waste reduction is my primary quest.

If this is your goal read this thread about waste treatment. HERE. Using the classic method of evaporation of wastes down to eliminate excess nitric is very slow and best done in a hood because it evolves a lot of fumes. Best to avoid it and kill excess nitric with sulfamic acid and recover your values before following the method in the thread to treat your waste. You could, after following those steps, evaporate the liquid down considerably if you need to.

You never said what you were refining, that little bit of information will further help us to steer you in the right direction.

Welcome to the forum.