Method of separating metal ions from pulp using a chelating agent
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United States of America Patent
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Nov 9, 1999
Grant Date -
N/A
app pub date -
Apr 11, 1996
filing date -
Nov 5, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods for separating metal ions from pulp material are disclosed including treating the pulp with a chelating agent to produce a pulp flow with dissolved metal ions, washing that pulp flow prior to bleaching with hydrogen peroxide or ozone and mixing the washed liquid containing metal ions with another flow of lignocellulose-containing material in order to bind the metal ions to that flow, washing that flow, and subsequently washing that flow at a reduced pH to produce a wash flow containing metal ions.
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