Traditional Culture Encyclopedia - Traditional customs - How to extract silver from printing and fixing water. What chemicals do you want to use?
How to extract silver from printing and fixing water. What chemicals do you want to use?
The main silver component of solid water is silver dithiosulfate ion.
[Ag(S2O3)2](3-)
The reaction of this substance with acid will produce Ag2S precipitation, but there is also S precipitation.
After filtering, first dissolve these two things together in concentrated nitric acid.
Sulfur is oxidized to SO2 by nitric acid and volatilized.
S+4HNO3===SO2+4NO2+2H2O
And silver is dissolved to obtain silver nitrate.
And then replace it with Fe, or decompose AgNO3 _ 3 with strong heat.
Fe+2AgNO3===Fe(NO3)2+2Ag
2AgNO3== (heating) ==Ag+2NO2+O2
Personal recommendation
If the amount of these liquids is not large, it is not worth recycling economically.
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