Method for reproducing heavy-duty package kraft linerboard by utilizing papermaking sludge

Abstract

A method for reproducing heavy-duty package kraft linerboard by utilizing papermaking sludge is disclosed. The method includes a sludge collection step, a high-concentration slag removal step, a centrifugal dewatering step, a sterilization and drying treatment step, a step of preparing filler slurry, a filler pulp preparing step, a flocculation step, a pulp preparation step, a papermaking step, asurface modification step, and a calendering step. The papermaking sludge is recovered and treated with an ultralow running cost and is used for producing the heavy-duty package kraft linerboard, andtherefore, pressure on sludge treatment of a papermaking enterprise is reduced, the benefit of recycling the papermaking sludge is higher than that of incineration methods, waste of land resources andgeological pollution caused by landfill of papermaking sludge are reduced, a production process is clean, environmentally friendly and free of production, and the integrated production cost of heavy-duty package kraft linerboard is reduced.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for remaking heavy-duty packaging kraftboard by using papermaking sludge. Background technique [0002] In the prior art, raw pulp papermaking includes the processes of pulping and papermaking. Both processes will produce a large amount of papermaking sludge. There are still a large proportion of short fibers, organic substances, lignin and their derivatives in the papermaking sludge. It has a certain recovery value. At present, most of the papermaking sludge treatment methods are mainly incineration and sanitary landfill. Through incineration, it is recovered in the form of heat energy. The utilization rate is extremely low, and it will cause air pollution, while sanitary landfill will waste land resources. It will also produce secondary pollution and cause a huge waste of renewable resources. [0003] If the fibers in papermaking sludge are to be recycled, there a...

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Problems solved by technology

[0002] In the prior art, raw pulp papermaking includes the processes of pulping and papermaking. Both processes will produce a large amount of papermaking sludge. There are still a large proportion of short fibers, organic substances, lignin and their derivatives in the papermaking sludge. It has a certain recovery value. At present, most of the papermaking sludge treatment methods are mainly incineration and sanitary landfill. Through incineration, it is recovered in the form of heat energy. The utilization rate is extremely low, and it will cause air pollution, while sanitary landfill will waste land resources. It will also produce secondary pollution and cause a huge waste of renewable resources

[0003] If the fibers in papermaking sludge are to be recycled, there are problems of high recycling cost and poor quality of recycled fibers. Therefore, it is difficult to make reasonable use of papermaking sludge and make it economically beneficial without causing secondary pollution. Achieved

[0004] Due to the existing technology recycling papermaking sludge is subject to various technical limitations, including the limitation of equipment cost of papermaking sludge treatment equipment, the limitation of load capacity and usage requirements of papermaking sludge treatment equipment, and the limitation of frequent maintenance of papermaking sludge treatment equipment , Consumables required for papermaking sludge treatment and operating costs such as electricity charges, etc. More importantly, the recycled papermaking sludge cannot be used directly for papermaking, otherwise the quality of the paper will be reduced, so the recycled papermaking sludge Sludge can only be sold to other companies and used for other purposes, and there are very few companies willing to use recycled paper sludge. How to use recycled paper sludge is also very troublesome.

Therefore, the recycling of papermaking sludge cannot produce benefits, and will only increase production costs or treatment costs, which is not as good as direct incineration. This is also an important reason why papermaking sludge recycling cannot be applied and popularized

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