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sodium bicarbonate peroxyhydrate

Newbies question:
Can this bleaching agent be use to neutralise used ferric chloride
solution?
Can it be use as a developer too?

thanks
ck
 
T

Tim Williams

Jan 1, 1970
0
I don't know that H2O2 reduces Fe(III). (It does reduce Mn(IV) and (VII)
quite nicely however.)

Plain old base of any sort (sodium carbonate, oh and BTW Oxyclean isn't
sodium bicarbonate peroxyhydrate, it's carbonte peroxyhydrate, mislabeled as
percarbonate) will neutralize the acidity, producing -- what else -- rust.

Make a solution of base (alkali [bi]carbonate, hydroxide, etc.) and add to
the ferric chloride until the solution is clear (the solution, not the
precipitate!).

If you would like to reduce it first, toss in some cheap metal like iron
nails and stuff. You'll get brown crud and a green solution of Fe(II)
chloride. Then neutralize.

Or just flush it with a lot of water, iron ions don't last long in the
environment and a little acidity (diluted, that is!) never hurt anything.

Tim
 
X

xray

Jan 1, 1970
0
I don't know that H2O2 reduces Fe(III). (It does reduce Mn(IV) and (VII)
quite nicely however.)

Plain old base of any sort (sodium carbonate, oh and BTW Oxyclean isn't
sodium bicarbonate peroxyhydrate, it's carbonte peroxyhydrate, mislabeled as
percarbonate) will neutralize the acidity, producing -- what else -- rust.

Make a solution of base (alkali [bi]carbonate, hydroxide, etc.) and add to
the ferric chloride until the solution is clear (the solution, not the
precipitate!).

If you would like to reduce it first, toss in some cheap metal like iron
nails and stuff. You'll get brown crud and a green solution of Fe(II)
chloride. Then neutralize.

Or just flush it with a lot of water, iron ions don't last long in the
environment and a little acidity (diluted, that is!) never hurt anything.

Tim

The best suggestion I ever heard about how to best dispose of ferric
chloride etch solution is to use it to mix concrete and send the
resulting brick off to the dump.
 
L

Luhan

Jan 1, 1970
0
Newbies question:
Can this bleaching agent be use to neutralise used ferric chloride
solution?
Can it be use as a developer too?

Screw the ferric cloride, I switched to Sodium Persulphate. Its totaly
clear in solution so you can watch your boards etch without pulling
them out each time, and it does not make nasty stains in you washstand
when rinsing out boards either.

Luhan
 
T

Tim Williams

Jan 1, 1970
0
xray said:
The best suggestion I ever heard about how to best dispose of ferric
chloride etch solution is to use it to mix concrete and send the
resulting brick off to the dump.

Hmm, I don't see that working-- concrete needs to be basic to set up,
something ferric chloride tends not to be. If you neutralized it first,
then mixed concrete with the murky glop, that would get you a very
servicable red-stained brick. (For that matter, cement red and brown colors
are exactly that stuff.)

Tim
 
J

joseph2k

Jan 1, 1970
0
Luhan said:
Screw the ferric cloride, I switched to Sodium Persulphate. Its totaly
clear in solution so you can watch your boards etch without pulling
them out each time, and it does not make nasty stains in you washstand
when rinsing out boards either.

Luhan

IIRC sodium persulphate will neutralise ferric chloride.
 
J

jasen

Jan 1, 1970
0
Hmm, I don't see that working-- concrete needs to be basic to set up,
something ferric chloride tends not to be. If you neutralized it first,
then mixed concrete with the murky glop, that would get you a very
servicable red-stained brick. (For that matter, cement red and brown colors
are exactly that stuff.)

if it's going in the garbage, concrete would be a waste of sand and gravel,
juse use cement (which is alkaline anyway), more concentrated active
ingredient, and costs about the same (per 40Kg bag) last time I looked.

chlorides aren't real good for concrete anyway so concrete bricks would
probably make lousy pavers....
 
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