Discussion
Green liquor is converted back to white liquor by
Answer: D
Correct answer: causticising with lime
The smelt dissolved in water is green liquor, containing sodium carbonate. Adding slaked lime converts the carbonate to hydroxide and precipitates calcium carbonate: \[ \mathrm{Na_2CO_3 + Ca(OH)_2 \rightarrow 2NaOH + CaCO_3}. \] The lime mud is filtered off and calcined back to lime in a rotary kiln, so the lime circulates as well, and the restored white liquor returns to the digester.
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