XeonTheMGPony - 10-8-2017 at 06:41
As I stated in another thread I have begun recovering Nickle and Chromium from NiChrome wire.
I am using the process that Extractions and Ire used: https://www.youtube.com/watch?v=F_W-IyUTM5M ,
Dissolving in HCl solution, then converting to the Carbonate form, then will leach out the Nickle with ammonia and then the Chromate with Calcium
Hypochlorite shock powder.
But the Mother liquor during the carbonate is a waste and should contain trace Sodium Carbonate and NaCl. But since I plan to just dump this I want to
ensure it is free of any Nickle or chromium be for dumping.
Now some checks on you-tube and about seem to indicate that 10% NaOH Solution can be used, or NH3 solution used to test for the presence of metal ions
by precipitating them out as insolubles.
What is your preferred method or what would be a more sensitive test I could use on my waste water be for dumping it?
Failing that I will evaporate it and bag the salts, but that will take a lot of energy and least favorable option.
JJay - 10-8-2017 at 06:54
There was quite a bit of discussion on that on this thread: http://www.sciencemadness.org/talk/viewthread.php?tid=74007
It is worth noting that calcium chromate is soluble in water but barium chromate is not.
XeonTheMGPony - 10-8-2017 at 10:08
Will read through that and yes I know calcium Chromate is water soluble this is sort of critical in the separation steps, it is the carbonate water I
am needing to test for trace.
The Calcium Chromate Solution will be recycled for new batches till it is too impure then it'll get looped back to the very beginning. that way it is
only the carbonate side that I need to test be for disposal.
Thank you for the link!