Method for regenerating corrugated paper by paper mill sludge cracking

A technology for papermaking sludge and corrugated paper, applied in papermaking, papermaking machines, textiles and papermaking, etc., can solve the problems of poor quality of recycled fibers, waste of land resources, waste of renewable resources, etc., and is beneficial to reuse and reduce sludge. The effect of small proportion of emissions and consumption

Inactive Publication Date: 2018-11-02
DONGGUAN TAICHANG PAPER CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

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. The content of papermaking sludge is rich, with an organic matter content of 40%-50%, mainly containing cellulose, hemicellulose and High molecular organic matter such as lignin and papermaking sludge have a certain recycling value. At present, most papermaking sludge treatment methods are mainly incineration and sanitary landfill. The incineration is recovered in the form of heat energy, and the utilization rate is extremely low, and it will cause air pollution. Sanitary landfills will waste land resources and produce secondary pollution, which will cause a huge waste of renewable resources. Therefore, it is necessary to effectively use these resources
[0003] At present, in the process of recycling and reusing papermaking sludge, the existing recycling methods have the problems of high recycling cost and poor quality of recycled fibers, so it is necessary to improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) The pulping step of waste paper pulp, using recycled waste paper or waste paper boxes to pulp through a pulper, pulping to cut off fibers, after separating filaments and brooms, adding additives, diluting the concentration of the pulp, and removing slag Separation of heavy and light, deinking after separation of good pulp and dross pulp to make waste paper pulp suitable for papermaking, the pulp concentration of waste paper pulp is controlled at 4-5%;

[0033] 2) The pulping step of coniferous wood fiber pulp, pulping the coniferous wood pulper, and then successively going through the high-concentration deslagging step, the rough screening step, the low-concentration deslagging step, the fine screening step and the concentration step, to produce Coniferous wood fiber pulp suitable for papermaking, the pulping concentration of coniferous wood fiber pulp is controlled at 8-10%;

[0034] 3) papermaking sludge treatment step, including the following sub-steps,

[0035] ...

Embodiment 2

[0051] A method for producing regenerated corrugated paper by cracking papermaking sludge. The main steps of this embodiment and the process parameters in the corresponding process steps are the same as those in the first embodiment, and the similarities will not be repeated. The difference lies in the following steps:

[0052] 1) Pulping steps of waste paper pulp

[0053] 2) Softwood fiber slurry pulping step

[0054] 3) papermaking sludge treatment step, including the following sub-steps,

[0055] 3.1) Papermaking sludge liquefaction stage

[0056] 3.2) Low temperature pyrolysis stage

[0057] 3.3) Separation and dehydration stage

[0058] 3.4) Press filter step

[0059] 4) Steps of mixing initial pulp and pulp

[0060] 5) The step of mixing and refining the primary pulp, transporting the mixed primary pulp to the refiner, and the mixed primary pulp passes through the rough grinding and fine grinding in the grinding sleeve device in the refiner, and the refiner uses a l...

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Abstract

The invention discloses a method for regenerating corrugated paper by paper mill sludge cracking. By means of a papermaking process in which paper mill sludge is subjected to pressurized liquefying, low-temperature cracking, separating and dewatering, filter pressing and the like to be suitable for regenerating corrugated medium paper in a paper mill, the paper mill sludge is better recycled; besides, a low-temperature cracking technology is adopted in the paper mill sludge pretreating process, and no chemical agent is needed; meanwhile, waste gas generated in the paper mill sludge treating process is centralizedly treated, secondary pollution is avoided, and the paper mill sludge treating process further reduces the cost and has higher environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of using recycled paper to make paper, in particular to a method for cracking recycled corrugated paper with 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. The content of papermaking sludge is rich, with an organic matter content of 40%-50%, mainly containing cellulose, hemicellulose and High molecular organic matter such as lignin and papermaking sludge have a certain recycling value. At present, most papermaking sludge treatment methods are mainly incineration and sanitary landfill. The incineration is recovered in the form of heat energy, and the utilization rate is extremely low, and it will cause air pollution. However, sanitary landfill will waste land resources, produce secondary pollution, and cause a huge waste of renewable resources. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/34D21B1/32D21F11/12D21H17/01
CPCD21B1/32D21B1/34D21F11/12D21H17/01Y02W30/64
Inventor 杜汉民杜汉杰余行宝黄奇志熊国平吴如双刘凯郑铭华郭政
Owner DONGGUAN TAICHANG PAPER CO LTD
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