slimes from sulfuric cell not black

[steyr223]

Hello ,how is everyone
Well i did it right this time
Needed cash for my regestration
Rounded up at least 3 to 4 5gal buckets of really
Bottom of the barrel quality boards and put the cell
To work all at the same time
Probally 3 weeks and maybe 7 or 8 batches
Almost 3 grams from cell and 4 grams from boards

Anyways my question;
I decided to do some pins(big ones) and the little
Gold plated stainless springy key pad things(wow)
In my sulfuric cell
Lead cathode
Stainless steal basket for anode
Glass container
Generator 12 v 15 amp fuse
Cut 1 gal milk container in half wich laid between basket
And chathode so as not to short

My slimes are very light browm i believe
As i watched the bubbles from the piece being deplated
I could see what almost looked like brownish-goldish
Color coming up
The milk jug wasnt it was a chlorine solution from the
Little i read of the peeled sticker
Is this a problem?

Also could it be my generator is puttimg out a lowet
Voltage than 12 unless reved up be the problem

Or is it even a problem.
Thanks steyr223 rob

 

[solar_plasma]

Did I understand right, that you had goldplating on stainless steel? If so, it wouldn't wondering me, if the brown colour comes from, that your gold is very pure, since no basemetals get dissolved. Only a guess. Once I have seen, that ss strips really fine.

 

[NobleMetalWorks]

You should be using copper as the anode basket.

If you look at your stainless steel anode basket, can you see where it's been attacked by acid?

The gold should be black in color, if you are not using a copper anode basket, and instead using Stainless Steel, I couldn't be sure what exactly is dissolving or being reduced. The way this process usually works is that persulfuric acid is created at the anode, which temporarily dissolves the gold from it's base metals like copper for example, once the persulfuric acids moves far enough away from the anode the acid changes back to sulfuric acid and the gold reduces back into a black powder.

Could the stainless steel be attacked by the persulfuric acid and possibly oxidizing something in the stainless steel, like iron for example? If this happened, the oxidized iron would have a redish/brownish color. I would suspect that your results would be very different if you switch to a copper anode basket.

You would get brown gold powder if you were using a nitric acid cell, and in that case you would use a stainless steel anode basket, is this what you are doing? Or is it a sulfuric acid cell?

Also, if you are not using concentrated sulfuric acid it may attack the base metals of either/or both of your cathode/anode.

Scott

 

[steyr223]

Hey scott how goes the box (red i think)

Yes o am running a sulfuric cell and yes my acid could
Possably use a little evape ,its 6 months old and have
Pumped maybe 15 lbs of material through it

And yes the stainless is past it's passive resistance
And is being attacked ( 4 or 5 strands of the basket
An inch or so per process ) this has never been a problem
As the basket cant hold my material it gets replaced.

My gold has always been 99.2 or above and i have never had amy
Filtering problems.

As far as iron goes I have not had any
Gold percipitate as gold colored dust
before I put the SMB in

What happens when you run to low voltage
with a cell

Thanks steyr223 rob