| 摘要 |
Exhaust gas, e.g. from a metallurgical process, containing SO2 and HF is acid scrubbed to remove most of the F compounds and is then base scrubbed to remove most of the SO2 and remaining compounds. The recycled acid absorbent is mixed with part of the recovered basic absorbent. Another part of the basic absorbent is regenerated by the addition of Ca(OH)2 and the regenerated basic absorbent is softened with F-containing absorbent from the acid-scrubbing stage.
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