Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Treating effluent tin from anodizing electrocoloring tank
1998
We operate an architectural anodizing line which includes a stannous-sulphate AC electro-coloring tank, followed of course by rinsing. Dragout from the tin colouring tank (containing typically
11g/L stannous and 24g/L sulfuric acid) produces stannous ions at the effluent treatment plant where simple neutralization precipitates aluminium hydroxide which is contaminated with tin in the ppm range.
Does anyone have any idea whether we could remove the tin from the rinse after the electrocolouring tank, by electrodeposition? (I presume the tin leve lwould be 1g/L or less, and quite acidic; I am having some analyses done)
- Pietermaritzburg, South Africa
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