Method for bleaching mechanically defibered pulp
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United States of America Patent
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Issued Date -
May 12, 2005
app pub date -
Jan 22, 2003
filing date -
Jan 23, 2002
priority date (Note) -
Abandoned
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Abstract
The invention relates to a method for bleaching mechanically defibered pulp with peroxide in alkaline conditions and for washing the bleached pulp and recovering chemicals from the spent liquor the bleaching step by concentrating and combusting the spent liquor and subsequently dissolving the ash thus formed into water. According to the invention, the alkaline conditions of the bleaching step are obtained by adding sodium aluminate to the pulp to be bleached, at least a part of the added sodium aluminate being the ash dissolved in water.
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