| 摘要 |
<p>The invention concerns a method for the delignification and bleaching of chemical paper pulp consisting of an acid treatment step for reducing by at least 10 % the amount of hexeunoric acids present in the pulp, a step of adjusting the pH of the pulp for depositing or re-depositing alkaline-earth metal ions on the pulp fibres, adding a chelating agent to the pulp before and/or during the acid treatment step and/or before, during or after the pH adjusting step, a step of washing the pulp and a step of treating the pulp with an oxidising agent.</p> |
