| 摘要 |
The process for recovering recyclable elemental sulfur from a strongly colored solution containing alkali metal sulfides, alkali metal polysulfides, or mixtures thereof comprising (a) mixing said solution at an alkaline pH with a decolorizing amount of an iron or zinc compound which is a hydroxide or the salt of an inorganic acid whereby a precipitate is formed, (b) separating the precipitate to isolate a decolorized solution, (c) precipitating elemental sulfur from the decolorized solution by adding sulfur dioxide or alkali metal thiosulfate under acidic conditions, and (d) separating the precipitated elemental sulfur.
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