| 摘要 |
PROCESS FOR THE DELIGNIFICATION AND BLEACHING OF CHEMICAL PULP COMPRISING AN ACID TREATMENT STAGE AIMED AT REDUCING THE QUANTITY OF HEXENE URONIC ACIDS PRESENT IN THE PULP BY AT LEAST 30, A PH ADJUSTMENT STAGE OF THE PULP AIMED AT DEPOSITING OR REDEPOSITING IONS OF ALKALINE-EARTH METALS ON THE FIBRES OF THE PULP, THE ADDITION OF A CHELATING AGENT TO THE PULP BEFORE AND/OR DURING THE ACID TREATMENT STAGE AND/OR BEFORE, DURING OR AFTER THE PH ADJUSTMENT STAGE, A WASHING STAGE OF THE PULP AND A TREATMENT STAGE OF THE PULP WITH AN OXIDIZING AGENT.
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