Treatment process for improving multi-disc filtered water of papermaking white water

Abstract

The invention discloses a treatment process for improving multi-disc filtered water of papermaking white water. The method comprises the following steps that: 1, white water collected by a white waterpool under a net is conveyed to a white water multi-disc for graded filtering, a retention aid is added into a pipeline where the white water is conveyed to the white water multi-disc for water filtering, and the adding amount of the retention aid is made to be 50-200 ppm through fine control; 2, the white water is separated into turbid filtrate, clear filtrate, ultra-clear filtrate and slurry bya white water multi-disc; 3, turbid filtrate is sent back to the white water multi-disc for graded filtering again, wherein the clear filtrate is used as paper machine concentration adjusting water and chemical dilution water, then the ultra-clear filtrate is sent into a paper machine spraying system; 4, the pulp is conveyed to a paper machine forming part, and dehydration of the paper machine forming part is recycled to an under-net white water pool; and 5, the step 1 to the step 4 are repeated. The adding amount of the white water multi-disc retention aid is 50-200 ppm through fine control,the paper sheet quality is improved, meanwhile, the white water concentration is reduced, the water filtering capacity of the white water multi-disc retention aid is improved, the fiber recovery rateis increased, the papermaking water consumption is reduced, and repeated cyclic utilization of white water is achieved.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a treatment process for improving the multi-disk filtration of papermaking white water. Background technique [0002] Papermaking is an important invention of the working people in ancient China, which can be divided into two forms: mechanism and manual. The mechanism is carried out continuously on the paper machine. The pulp suitable for paper quality is diluted with water to a certain concentration, and is initially dehydrated in the wire part of the paper machine to form a wet paper sheet, which is then dehydrated by pressing, and then dried into paper. The paper industry uses native plant fibers such as wood, bamboo, and reed, and recycled fibers such as waste paper as raw materials. At present, waste paper raw materials account for more than 60% of the raw material structure of the paper industry. Among them, the white water system is a recovery, treatment a...

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Problems solved by technology

[0003] Due to the repeated use of waste paper raw materials, the quality of the raw materials is poor and there are many impurities. The white water system of the current container board machine contains a large amount of fine fibers and fillers, which seriously reduces the ability of the white water multi-disc water filtration. It is deteriorating. In addition to the paper machine white water system, it also greatly increases the amount of clean water

The conventional technology used at this stage is to add retention and drainage aids in the sizing process of the paper machine to improve the retention of fine fibers, improve the drainage of the pulp in the wire part, and reduce the white water concentration under the wire. However, retention Filter aids cannot fully control the concentration of white water under the net. When the concentration of white water is too high, it will be difficult to filter the white water with multiple discs under the net, reducing the white water treatment capacity of the multi-discs. The ultra-clear filtrate requires additional filtration due to insufficient filtration. Replenish clean water and increase the amount of clean water; when excessive retention and drainage aids are added in order to reduce the concentration of filtered water under the screen, it will affect the quality of the paper

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