Anodising guide - 6. Disposal of chemicals
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It should be obvious that used chemicals shouldn't be poured into the drain. Below you will find hints to dispose them correctly:
- Sulfuric acid
Slowly stir lime into the acid until no more gas formation takes place.
The products are then water and harmless gypsum.
- Nitric acid
Carefully stir lime or soda into the acid until no more gas is produced.
They products are water and nitrates, which e.g. can be used as nitrogen fertiliser.
- Sodium hydroxid
Add plenty of sulfuric or acetic acid until the solution reaches pH 7 or pour
the solution strongly diluted into the drain (even the usual chemical drain cleaners are
almost exclusively sodium hydroxide).
- Dye baths
Since there are used different classes of chemicals, please follow the instructions in the
relevant technical data sheets.