Discussion
Black liquor from a kraft mill is
Answer: A
Correct answer: evaporated and burned to recover chemicals
Black liquor carries the dissolved lignin and the spent cooking chemicals. Concentrated to about seventy per cent solids and burned in a recovery boiler, the organic content raises steam and the inorganic content leaves as a smelt of sodium carbonate and sodium sulphide. Over ninety-five per cent of the chemicals are recovered, and a kraft mill is usually a net exporter of energy as a result.
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