| 摘要 |
PURPOSE:To detoxify the heavy metal contained in dust and sludge, by reacting polyethyleneimine, carbon disulfide and sodium hydroxide with dust and a sludge and further adding sodium diethyldithiocarbamate to the reaction mixture to mix the same therewith. CONSTITUTION:Carbon disulfide is added to and kneaded with ethyleneimine an caustic soda, sodium diethyldithiocarbamate, sodium sulfide and water are subsequently added to the kneaded mixture and sodium thiosulfate is further added thereto to perform stirring. The obtained liquid composition is added to dust and sludge containing noxious heavy metal ions to be kneaded therewith sufficiently. By this method, the heavy metals contained are sealed-up and the re-elution thereof is prevented.
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