| 摘要 |
Method and apparatus for pulp bleaching at several bleaching stages by utilizing two or more different bleach chemicals. Bleach chemical (E) is in turn led to the pulp so that it displaces of pulp the chemical used at the preceding stage (C/D, D). Displacing chemical (E) is led to the pulp sheet when on the filtering area of a multi-stage drum washer (1, 2). |
