Marshall,

Have you ever done a calculation using Faraday's equation on your setup
where you take the total current over time to calculate the total
released silver in your system and compare it to the that necessary
(theoretically)  to make the 10 ppm CS, where the difference between the
two would be losses due to plating out of silver, etc in your system?

If you could do this for reversing vs. non reversing current using the
same setup, it would be very interesting.

You are doing enough volume so that the differences should be easy to
see.

Dan

>>> Marshall Dudley <[email protected]> 4/28/2006 10:58:32 AM >>>
You will find a flow through process much more reliable, faster, and
more
consistant.  Plus you can easily change the ppm easily by varying the
flow rate
when using constanct current.  Using non reversing current, you will
end up
with a significant amount of the silver plating out on the cathode,
and
eventually breaking loose and falling to the bottom. I would reccomend
using a
smaller container, about 1 gallon, flow through processing and a
reversing
constant current source. That is what I use to produce 55 gallons at a
time, at
the rate of about 1..5 gallon per hour per 10 ppm.

Marshall

HRBE wrote:

> I have been doing some experimenting with making bulk CS.
>
> I have come up with the following setup.
>
> 1 x  5 gallon (imperial) fish tank
> 1 x 36 square inches 99.99% silver plate
> 1 x 36 square inches brass plate.
> 1 x aquarium water pump
> 1 x 30volt DC power supply, with adjustable current regulation.
>
> I spaced the plates @ 3 inches, I wrapped the brass plate in paper
towel to
> prevent the gunge from being circulated in the water. I limited the
current
> to 100ma.
>
> By wrapping the brass plate in paper towelling I don't need to wipe
the
> plate clean.
>
> 8 hours later, I have 5 gals of perfectly clear CS solution, which
reads
> 25uS on my Hanna HI98308 TDS meter.
>
> I used current control because I didn't have the time to "babysit"
the
> process
>
> I used Bob Berger's book as a guide for construction and I am
building 45
> volt dc current regulated power supply to try to shorten the brew
process
> time.
>
> Hope this is of interest to the group
>
> John McLean
> Australia
>
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