| 摘要 |
The invention relates to a method for treating the water circuit of paper machines according to which the solids are separated from the waste water emitted by the paper machine and the purified water and a part of the solids are fed back into the production process. The invention is characterized in that in a first separation stage the waste water is divided into a fiber fraction and a fines fraction, the fiber fraction being returned to the production process. The fines fraction undergoes a second, separate separation stage in which the fines are separated from the water, an adjustable fraction of same being returned to the production process. Prior to the second separation stage auxiliary agents are optionally added which in said second separation stage permit the separation and removal of dissolved colloidal or other impurities which are then fully or partly removed from the production process. The invention permits both the highly flexible operation of the water circuit system of a paper machine and, as a result, considerable production optimization by allowing for adjustment of the fines fraction in the paper production process and the intermittent discharge of impurities, which in turn makes it possible to reduce impurity deposits in the paper machine. |
