Electrochemistry from what exsits the bIack H2SO4-sIuge

[nickton]

Could one use a distilling apparatus to separate the black sludge from Sulfuric acid, and at the same time clean the acid for future use ? It would be nice if I could recover the H2SO4 and perhaps later use it to make more nitric acid.
Just a thought.

 

[FrugalRefiner]

Sulfuric doesn't really lend itself to distillation. You can recover the sulfuric for reuse by the application of patience. The sludge will eventually settle, though the more concentrated the sulfuric is the slower it tends to settle.

If you have to, you can add the sulfuric to a small amount of water (do NOT add water to concentrated sulfuric) which will facilitate settling. Then you drive off the added water from the clear solution by heating, but to well below the temperature needed for distillation.

Dave

 

[nickton]

View attachment DSC_0179.JPGYea. I was pretty much thinking that would be the case. I knew sulfuric boiled at a much higher temp than other acids.

However I thought I would share a simple method I figured out to improve contact between pins when reverse electroplating: I had some extra copper mesh that I cut to fit on top of them in my basket and then filled a glass jar with rocks and sand, which I then placed on top of the upper mesh to weigh it down, thus increasing the contact pressure. I had previously noted that just pressing down with something (like a stick or glass rod) on a batch pins made a big difference in current, so I figured a weight would help and it certainly did.

Here are some pictures of my set up. I like to keep everything in a large plastic pan in which I sprinkle some baking soda to neutralize any spills or drips. If it gets too hot I just stop for a while. I cannot seem to find what temperature is considered too hot for stripping.

sorry about the bad order of my pictures. I don't know how to re arrange them properly.

 

[FrugalRefiner]

sorry about the bad order of my pictures. I don't know how to re arrange them properly.

See Attaching Images or Files, Working with Attachments.

Dave

 

[nickton]

thanks for the link. I will definitely re size my images next time.

 

[nickton]

I hope this is the right place to post this. I have quite a few gallons of pale green rinse water from this process that I am wondering how to process, and expect more. Some of it is in a five gallon bucket with a chunk of metal electric motor laminates hanging into it, to cement anything out, but after a week or so nothing seems to be happening. Perhaps the solution is too dilute? I have so much of this highly diluted light green water I can't really add it to my stock pot because it would take up too much room and not add enough metal. I wonder if someone could chime in on what they do with it. When is it okay to throw it down the drain? Or maybe I missed it somewhere in my readings.

Thanks,
Nick F.

 

[jimdoc]

http://goldrefiningforum.com/phpBB3/viewtopic.php?f=47&t=1300

 

[nickton]

thanks for the link.