| 摘要 |
PURPOSE:To recover hydrosulfide and carbonate at the same time, by bringing gaseous carbon dioxide into reaction with waste liquid contg. alkali sulfide and carbonate, and alkali hydrosulfide or caustic alkali. CONSTITUTION:Gaseous CO2 or gas contg. CO2 is blown to a waste liquid contg. alkali sulfide, alkali carbonate and alkali hydrosulfide or caustic alkali. The formulas I -III are predicted for the reaction in such reaction system, and in the case of a batch operated treatment, the liquid compsn. consists essentially of NaSH, Na2CO3 at around the peak of the temp. elevation in the system. Therefore, the reaction of the formula I is required to be essential and the reaction of the formulas II, III is required to be suppressed. In the case of, for example, the batch operated treatment, the continuous measurement of the temp. in the system suffices. In the case of the continuous treatment, the CO2 corresponding to the Na2S and NaOH components in the waste liquid is measured and supplied or the waste liquid corresponding to the Na2S and NaOH components corresponding to the CO2 component is measured and supplied. |
