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Zero-discharge online high concentration extraction process for chemimechamical pulp pulping waste liquid

A technology for pulping waste liquid and extraction process, which is applied in the field of pulping and papermaking, and can solve the problems of large water volume and low concentration.

Active Publication Date: 2015-09-23
白博
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional mechanical pulp process adopts the route of pulping and bleaching first, and then extracting sewage, resulting in large water volume and low concentration

Method used

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  • Zero-discharge online high concentration extraction process for chemimechamical pulp pulping waste liquid
  • Zero-discharge online high concentration extraction process for chemimechamical pulp pulping waste liquid
  • Zero-discharge online high concentration extraction process for chemimechamical pulp pulping waste liquid

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Embodiment 1

[0061] Raw materials: air-dried wood chips, moisture content 10%, size 10-20mm×20-30mm×30-50mm, place of origin: Liaocheng, Shandong Province

[0062] Implementation steps:

[0063] 1. According to the process flow: wood chip washing (a2) - wood chip cooking (b2) - extrusion tearing (MSD) (c2) - dipping and dosing (d2) - reaction chamber (e2) - extrusion tearing Cracking (MSD) (g2) - impregnation dosing (h2) - reaction chamber (i2) - squeezing and washing (j2) - high consistency refining (k2) - dosing (l2) - reaction chamber (m2)——squeezing and washing (n2)——high consistency refining (o2)——squeezing and washing (p2).

[0064] 2. Chip washing (a2). It is carried out in a drum type washing machine with a specification of Ф1000×1000, the raw material concentration is 5%, and the recycled mixed evaporation condensed water with a COD of 1000mg / L is used to supplement the raw material washing water. The condensed water comes from the seven-effect evaporation station of Shandong T...

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Abstract

The invention discloses a zero-discharge online high concentration extraction process for a chemimechamical pulp pulping waste liquid. Online high concentration extraction is carried out on the pulping waste liquid and the high concentration waste liquid is evaporated and concentrated. Evaporated condensate water is recycled to a pulping production process and resource utilization of an evaporated residual liquid is carried out so as to realize zero discharge of the pulping waste liquid. Online high concentration extraction of the pulping waste liquid comprises the process links: decomposition-separation of pollutants; counter flow washing; and front-section extraction; the evaporated condensate water is recycled to material washing and dosing to impregnate and bleach; resource utilization of the evaporated residual liquid comprises production of fertilizers and alkali lignin and alkali recovery. On the basis, a conventional chemimechamical pulp process is redesigned.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to an online high-concentration extraction process of chemical-mechanical pulping waste liquid with zero discharge. technical background [0002] Zero discharge of chemical-mechanical pulping waste liquid is a development direction, and online high-concentration extraction of chemical-mechanical pulping waste liquid is an effective way to achieve zero discharge. [0003] 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 discharge of chemical-mechanical pulp waste liquid. The company uses popla...

Claims

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Application Information

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IPC IPC(8): D21C3/22D21C9/10D21C9/02D21C11/10D21C11/00
CPCD21C5/00D21C11/00D21C11/10
Inventor 白博白嘉妮史晓菲王勇
Owner 白博
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