| 摘要 |
<p>1. Process for the recovery of sulphur from coloured effluent solutions containing alkali metal sulphides and/or alkali metal polysulphides, characterized in that a heavy metal hydroxide or a heavy metal salt is added, at a pH ranging between 9 and 14, to the solution in an amount sufficient for decolorization, the precipitate formed is separated and either sulphur is precipated and separated from the decolorized filtrate in a manner known by itself or the alkali metal polysulfide contained in the decolorized filtrate is used for the production of sulphur dyestuffs.</p> |
