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The black liquor recovery boiler in a kraft pulp mill serves to

  • A.dry the finished paper before reeling
  • B.bleach the pulp before it reaches the machine
  • C.generate the vacuum for the press section
  • D.burn the spent liquor and recover its chemicals

Answer: D

The organic fraction of the wood dissolved in pulping is burnt as fuel while the inorganic chemicals are recovered for reuse, which makes a well run mill nearly self sufficient in energy. It is both an energy and a chemical recovery plant.

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