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A zero-discharge process of pulping waste liquid from cotton straw chemical pulping

A technology for pulping waste liquid and zero discharge is applied in the field of pulping and papermaking, which can solve the problems of difficult treatment, large water volume and low concentration, and achieve the effects of reducing pollution load, achieving zero discharge and improving bleaching efficiency.

Active Publication Date: 2017-08-25
白博
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the amount and concentration of chemical-mechanical pulp wastewater is related to the pulping process. The traditional mechanical pulp process uses high-concentration bleaching to extract sewage, resulting in a large amount of water and low concentration.
[0013] The pulping waste liquid of cotton straw bleached mechanical pulp is more difficult to treat than general wood pulp

Method used

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  • A zero-discharge process of pulping waste liquid from cotton straw chemical pulping
  • A zero-discharge process of pulping waste liquid from cotton straw chemical pulping
  • A zero-discharge process of pulping waste liquid from cotton straw chemical pulping

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Raw material: cotton straw, place of origin: Liaocheng, Shandong Province

[0049] Raw material preparation: air-dry the whole stalk raw material, with a moisture content of 14%, cut and crush to 20-50mm

[0050] Pilot test platform: Shandong Kailong Paper Technology Co., Ltd. 10,000 tons / year high brightness non-wood fiber bleached mechanical pulp pilot line

[0051] Implementation steps:

[0052] The technological process adopted is: raw material washing (a)——raw material cooking (b)—extrusion washing, pulp washing, silk rubbing and dosing (cdef4)—dipping (g4)—extrusion washing, pulp washing, silk rubbing and dosing (h4) - Dipping (i4) - Washing (j4) - High consistency refining (k4) - Dosing (l4) - Dipping (bleaching) (m4) - Washing (n4) - High consistency grinding Pulp (o4) - pulp washing (p4).

[0053] 1. Raw material washing (a). It is carried out in a drum-type raw material scrubber with an output of 10,000 tons / year, the raw material concentration is 5%, and ...

Embodiment 2

[0081] The technological conditions of raw material cooking (b) are: temperature is 40 DEG C, time is 120min, NaOH 2%.

Embodiment 3

[0083] The technological conditions of the raw material cooking (b) are: the temperature is 99° C., the time is 120 min, and NaOH is 1%.

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Abstract

A zero discharge process of pulping waste liquid of all-cotton straw chemi-mechanical pulp. The process comprises: firstly performing front-end high concentration extraction of pulping waste liquid, then performing evaporation and concentration of the high concentration pulping waste liquid, recycling evaporation and condensation water, and recycling evaporation residue fluid, so as to implement the zero discharge of the pulping waste liquid finally. The front-end high concentration extraction of the pulping waste liquid comprises: extracting the pulping waste liquid in the procedures of squeezing, pulp washing, filament rolling, drug addition and pulp washing.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to a zero-emission process for pulping waste liquid from cotton straw into mechanical pulp. [0002] technical background [0003] The zero discharge of chemical pulping wastewater is a development direction. The front-end extraction of pulping waste liquid, evaporation and concentration, and resource utilization of the evaporated residual liquid are to achieve zero discharge of cotton straw chemical pulping waste liquid. effective way. [0004] According to the article "Development of Chemical-Mechanical Pulp Wastewater Treatment Technology in China" published by Fang Guigan in the first issue of March 2013 in the 98th issue of "Jiangsu Papermaking", the Canadian Pulp and Paper Research Institute first proposed zero chemical-mechanical pulp wastewater in the 1980s. After that, Meadow Lake Pulp Ltd used alkali recovery technology for the first time in the world to realize zero...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/00D21C11/10D21C5/00D21C9/02
CPCD21C3/26D21C9/02D21C9/16D21C9/18D21C11/00D21C11/10
Inventor 白博王勇刘玉芳白嘉妮史晓菲白伟才安骏薛希贤
Owner 白博
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