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Method for comprehensively recycling pulping waste liquid

A pulping waste liquor and black liquor technology, which is applied in the fields of pulping waste liquor combustion, pulping liquid regeneration, green liquor and white liquor treatment, etc., can solve the problems of pulping and papermaking wastewater pollution and difficult treatment, etc. Achieve the effect of fine process, reduce production cost, and recycle chemicals

Inactive Publication Date: 2020-06-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for comprehensive recycling of pulping waste liquid, which solves the problems of serious pollution and difficult treatment of pulping and papermaking wastewater in the prior art

Method used

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  • Method for comprehensively recycling pulping waste liquid

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Effect test

Embodiment 1

[0056] A method for comprehensive recycling of pulping waste liquid in the present invention, the flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0057] Step 1, extracting the dilute black liquor from the pulping cooking liquor, then pretreating the dilute black liquor, and finally evaporating and concentrating the pretreated dilute black liquor by using a mixed-flow indirect evaporation method;

[0058] The components of the dilute black liquor extracted in step 1 are 70% combustible organic matter, 30% inorganic matter, and the inorganic matter includes residual chemicals in the cooking waste liquid, such as NaOH, NaOH 2 S, and the metal base combined with the organic matter in the pulping raw material, and the inorganic components brought by the pulping raw material itself.

[0059] In step 1, the pretreatment of dilute black liquor includes deslagging, oxidation, and silicon removal, and deslagging refers to the removal of fine fibers and ...

Embodiment 2

[0079] A method for comprehensive recycling of pulping waste liquid in the present invention, the flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0080] Step 1, extracting the dilute black liquor from the pulping cooking liquor, then pretreating the dilute black liquor, and finally evaporating and concentrating the pretreated dilute black liquor by using a mixed-flow indirect evaporation method;

[0081] The components of the dilute black liquor extracted in step 1 are 70% combustible organic matter, 30% inorganic matter, and the inorganic matter includes residual chemicals in the cooking waste liquid, such as NaOH, NaOH 2 S, and the metal base combined with the organic matter in the pulping raw material, and the inorganic components brought by the pulping raw material itself.

[0082] In step 1, the pretreatment of dilute black liquor includes deslagging, oxidation, and silicon removal, and deslagging refers to the removal of fine fibers and ...

Embodiment 3

[0102] A method for comprehensive recycling of pulping waste liquid in the present invention, the flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0103] Step 1, extracting the dilute black liquor from the pulping cooking liquor, then pretreating the dilute black liquor, and finally evaporating and concentrating the pretreated dilute black liquor by using a mixed-flow indirect evaporation method;

[0104] The components of the dilute black liquor extracted in step 1 are 70% combustible organic matter, 30% inorganic matter, and the inorganic matter includes residual chemicals in the cooking waste liquid, such as NaOH, NaOH 2S, and the metal base combined with the organic matter in the pulping raw material, and the inorganic components brought by the pulping raw material itself.

[0105] In step 1, the pretreatment of dilute black liquor includes deslagging, oxidation, and silicon removal, and deslagging refers to the removal of fine fibers and v...

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Abstract

The invention discloses a method for comprehensively recycling pulping waste liquid, which comprises the following steps: extracting dilute black liquid from pulping cooking liquid, pretreating the dilute black liquid, and finally evaporating and concentrating the pretreated dilute black liquid by using a mixed-flow indirect evaporation method; then performing combustion with a jet furnace so thathigh-temperature flue gas generated after organic matters in the black liquid are combusted rises in the furnace, and inorganic matters are molten, flow into a dissolving tank from a chute below thecombustion furnace and dissolved in dilute white liquid or water to form green liquid, with the green liquid comprising Na2CO3 and Na2S; carrying out a causticization reaction on the green liquid formed by inorganic melt dissolved in dilute white liquid or water; and finally, recycling a product generated by the causticization reaction of the green liquid. According to the method, the problems ofserious pulping and papermaking wastewater pollution and high treatment difficulty in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of waste liquid treatment, and in particular relates to a method for comprehensive recovery and utilization of pulping waste liquid. Background technique [0002] The pulp and paper industry is a traditional large water user and one of the important sources of water pollution. With the development of the economy, enterprises are increasingly facing the problems of water shortage and shortage of raw materials. On the other hand, water pollution is becoming more and more serious. At present, the discharge of wastewater and COD in my country's pulp and paper industry ranks first in the discharge of various industries in my country. Processing has become an essential link. [0003] Pulping waste liquid refers to the cooking waste liquid produced by chemical pulping and the waste water produced in pulp washing and bleaching process. The pulping method in my country is dominated by alkaline cooking, and its soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/00D21C11/12
CPCD21C11/0064D21C11/0078D21C11/12
Inventor 栾飞杜晓云
Owner SHAANXI UNIV OF SCI & TECH
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