| 摘要 |
<p>In the removal of sulphur oxides, esp. SO2, from waste gas with the simultaneous winning of high purity gypsum, the gas is treated with an absorbent suspension of a calcium cpd. contg. an alkali metal sulphate, after which sulphuric acid is added to the suspension. The Ca cpd. is pref. CaCO3 Ca(OH)2 or dolomite, whereas the alkali metal sulphate is pref. Na - or K (b) sulphate. The alkali metal sulphate may also be obtd. via NaOH, KOH, Na2SO3, or K2SO3 and an MnII or FeIII salt is pref. added to the suspension, e.g. MnCl2, or FeCl3. The suspension is pref. circulated continuously through a scrubbing tower. Economic treatment of waste combustion gas is obtd. where the prod. has a commercial value.</p> |
