Method for blending corrugating base paper by utilizing secondary fiber after anaerobic digestion of paper mill sludge

Abstract

The invention discloses a method for blending corrugating base paper by utilizing secondary fiber after anaerobic digestion of paper mill sludge, belonging to the fields of recyclable material and environmental protection. The method comprises the following steps of: by using the secondary fiber obtained after anaerobic digestion of paper mill sludge, waste paper pulp and softwood pulp as raw materials, separating and brooming the fiber through defibering and beating treatment, then dewatering, mixing, and then adding a reinforcing agent and a sizing agent to defiber; and adding paper pulp after defibering in a sheet machine so as to form uniform pages, and then pressing and drying to form corrugating base paper. The method is simple in process and high in operability, and the secondary fiber after anaerobic digestion of paper mill sludge is utilized for mixing with the waste paper pulp for papermaking, so that the energy of papermaking enterprises is saved, simultaneously efficient resource utilization of remaining secondary fiber after anaerobic digestion of paper mill sludge is realized, a new raw material source is created for papermaking factories, the cleaner production level of papermaking enterprises is improved, the resource utilization ratio of paper mill sludge is realized to the maximum, and the method has important engineering application value.

Description

technical field [0001] The invention belongs to the field of renewable materials and environmental protection, and in particular relates to a method for preparing corrugated base paper using secondary fibers after anaerobic digestion of papermaking sludge. Background technique [0002] Papermaking sludge refers to the mixed sludge obtained in the primary settling tank and secondary settling tank during the biochemical treatment of paper mill wastewater. As the paper industry is a large water consumer, a large amount of papermaking wastewater has produced a large amount of papermaking sludge in the process of biochemical treatment. According to statistics, in 2007, my country produced about 23.89 million tons of dewatered papermaking sludge (water content 80%), 478 It is estimated that by 2020, my country will produce about 30.88 million tons of dewatered papermaking sludge (water content 80%, 6.18 million tons of dry sludge). [0003] Faced with such a large amount of paperm...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a papermaking sludge with a large output, serious environmental pollution, and an urgent need for proper treatment. The digested substrate of the papermaking sludge still needs to be properly treated after anaerobic digestion. In addition, the raw materials in the papermaking industry are in short supply. Method for preparing corrugated base paper from secondary fiber after anaerobic digestion of sludge

This method has the characteristics of solving the environmental pollution of papermaking sludge and maximizing the resource utilization of papermaking sludge

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