| 摘要 |
The proposed invention deals with pulp and paper production, in particular, with the process for preparing pulp cooking liquors to manufacture a fibrous semifabricate. A cooking liquor is proposed to be prepared by saturation of a water medium with sulfurous anhydride provided that this water medium is in fact either a pulp and paper mill waste water with activated sludge (18-40g/l) and soda ash (1,55-2,50% by weight) in it or alkali hydrolyzate produced in treatment of the same waste water by a mixture of base salts containing sodium carbonate (50-90% by weight based on Na2O) at the temperature 25-40 DEG C followed up with a solid sediment removal and the saturation goes on until sulfurous anhydride concentration in the liquor is 2,5-5,5% by weight. The proposed method allows to increase considerably the output of a fibrous semi-fabricate and improve its mechanical characteristics not to speak of utilizing waste water generated at a waste water treatment plant of a pulp and paper mill and expanding a sources of raw materials needed for cooking liquors preparation. |
