Electrochemistry Shor fume scrubber

[924T]

I also went to the Shor website last night, wanting to review their instruction manual for the Simplicity
salt cell, to see how the directions sat with me after having read a fair amount about salt cells here on the forum.

I was surprised to see that they have a basic fume scrubber for Nitric/Aqua Regia, and it looks to be
reasonably priced (I seem to remember $79); at first glance I thought it appeared to be using
activated charcoal.

Has anybody else seen this?

Cheers,

Mike

 

[NobleMetalWorks]

Not that I would use this method myself, but it's easy to make a charcoal filter for fume scrubbing, and to build in a way to ensure you know when the carbon has reached maximum absorption.

Use an enclosed/sealed reaction system, like a round bottom flask/reaction vessel.

Use the proper fittings and use a piece of labglass that looks like this:

Fill it with activated carbon

Place a piece of PH paper (for testing PH) on top of the carbon, this is your indicator that the carbon is saturated and can no longer absorb gasses.

This is not the best solution, and even if you do use this type of system to scrub fumes, you should have a backup, perhaps two of these in line, once one starts to show on the PH paper it is exhausted, move the second one to it's place, refill and replace the newly charged one in the 2cd position. As well bubbling through a neutralizing solution will also help. This will not catch all fumes, and you shouldn't be breathing the air that exhausts, or exhausting the air anywhere close to people or animals, or anything metal. It is better than venting directly into the atmosphere however.

Scott

 

[924T]

NobleMetalWorks,

I'm about 6 months late, but wanted to say thanks for your reply!

I finally found out what the piece of glassware in your picture is called: it is a 'Chromatography Reservoir'.

So, if I run 2 of these inline, and then run tubing from the outlet of the 2nd reservoir through a bubbler hose
in a NaOH solution, the resulting exhaust would still be unsafe?

That's amazing.

How long would the post-carbon fumes need to circulate in a NaOH solution before being deemed scrubbed
well enough to be released into the atmosphere?

Cheers,

Mike

 

[nickvc]

Even large professionally built scrubbers only remove around 80% of the fumes when run and monitored properly, to increase the efficiency you can run sealed reactions which are scrubbed and then pass the fumes through another general scrubber but the truth is you will struggle to remove all the fumes which is why large high stacks are used to vent the fumes and disperse them.

 

[castagna669]

hello, i was reading your post and when i came into refining i would build most of material needed to put together a good system. What your talking bout is good idea but like someone said once the process starts there is no stopping it. So instead of having 2 back up to change out you can use a 5 gallon bucket with a air tight lid.drlill out the exact size for your tubing then once you insert the tubbing you can put a flange into it to tighting it making it air tight. If you are still looking for a way to make a home made scrubber i have some really good methodes depending on the amount of metal you will be disovlving each batch.you can message me.

Email contact removed, first post suspicious of spamming board on first post.
Butcher

 

[Lou]

Nick,


Fume scrubbers here in the US need to be considerably more efficient than 80%!

The key things to a fume scrubber are:

• 
  Volumetric flow rate of gas entering the scrubber
  Concentration of gas to be scrubbed at inlet
  Scrubbing chemistry
  Scrub media (typically a high surface area material--we use Lanpac)
  Residence time

NOx in particular needs longer residence times. Sulfide-NaOH and sulfite/thiosulfate NaOH don't work as well on the NO but are very effective at catching NO2. It's been my experience that the best practice for dedicated NOx scrubbers is a lead peroxide scrubber for HNO3 recapture and recycle back to process followed by a scrubber using aforementioned reduction chemistry to get anything that might pass through (which often doesn't).

Well-designed plant level systems use continuous surface gassing and will keep off gas to an absolute minimum. Here you see it applied to gold, but it can also be used with other chemistries to achieve different goals.

You can see an example of such a system here:

http://www.prioreng.com/precious-metal-refining-technologies/hydro-metallurgy.html

Of course that gentleman who owns the business is probably one of the best PM chemists out there and is well-reputed.

 

[Westerngs]

One of the best PM chemists is true, but extremely overpriced, just my humble opinion.

 

[necromancer]

hello, i was reading your post and when i came into refining i would build most of material needed to put together a good system. What your talking bout is good idea but like someone said once the process starts there is no stopping it. So instead of having 2 back up to change out you can use a 5 gallon bucket with a air tight lid.drlill out the exact size for your tubing then once you insert the tubbing you can put a flange into it to tighting it making it air tight. If you are still looking for a way to make a home made scrubber i have some really good methodes depending on the amount of metal you will be disovlving each batch.you can message me or email me casta.

email address ?

everything is free on this great web site, i would like to ask if you would be willing to make and post a tutorial with photos for all to see & build there own

thank you

 

[butcher]

First post with the email address, makes it appear you are here to spam the board, if you have something to share great, but if your intention is to spam the board you will not be here long,
I am removing the contact, if members think they need your help they can contact you by forum PM 9that is as long as you remain a member in good standing.