Recycling comprehensive utilization technology for pulping black liquor or red liquor

A technology for pulping black liquor and red liquor, which is applied in the field of paper pulping, can solve the problems of waste of water and sludge resources, backward treatment technology and high treatment costs, and achieve low treatment costs, less investment in equipment, and elimination of pollution Effect

Active Publication Date: 2012-08-15
谢明文 +1
View PDF4 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] It can be seen that the current pulping black (red) liquid treatment technology is backward, the investment is large, and the process is complicated, causing

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Recycling comprehensive utilization technology for pulping black liquor or red liquor
  • Recycling comprehensive utilization technology for pulping black liquor or red liquor

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0054] Example 1: Treatment of black liquor

[0055] Taking the soda pulping of Northeast Korean pine in Yueyang Paper Mill as an example, its black liquor is comprehensively utilized and treated by the following process.

[0056] Pretreatment: In the black liquor pool (with a low-speed stirrer), add CPAM grafted starch, the amount is 2.5% of the amount of black liquor, stir at low speed for 10 minutes, and then add H 2 SO 5 , The dosage is 3% of the amount of black liquor, and stir at low speed for 10 minutes to flocculate the solids in the black liquor to obtain the pretreatment liquid.

[0057] Dehydration: The pretreatment liquid is sent to the filter press dehydrator ZQWY-50, the flocculated solids in the pretreatment liquid are filtered into a sludge cake, and the dewatered water is sent to the water treatment tank.

[0058] Water treatment: In the water treatment tank, add CaCO 3 Adjust the pH to 7, then add the chelating agent DTPMPA, the amount is 0.1% of the water volume, t...

Example Embodiment

[0066] Example 2: Treatment of red liquor

[0067] Taking Yueyang Hongyun Paper Technology Research Institute Co., Ltd. sulfite method pulping as an example, its red liquor is comprehensively utilized through the following processes.

[0068] Pretreatment: Add CPAM grafted starch in the red liquor pool (with low speed agitator), the amount is 3% of the amount of black liquor, stir at low speed for 10 minutes, then add 2CaCO 3 ·3H 2 O 2 , The dosage is 3.5% of the amount of black liquor, and stir at low speed for 10 minutes to flocculate the solids in the black liquor to obtain the pretreatment liquid.

[0069] Dehydration: The pretreatment liquid is sent to the filter press dehydrator ZQWY-50, the flocculated solids in the pretreatment liquid are filtered into a sludge cake, and the dewatered water is sent to the water treatment tank.

[0070] Water treatment: In the water treatment tank, add sulfuric acid to adjust the pH to 7, then add the chelating agent DTPMPA, the amount is 0.1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the field of paper-making pulping and relates to a recycling comprehensive utilization technology for pulping black liquor or red liquor. The recycling comprehensive utilization technology is characterized by comprising the following steps in turn: pre-treating; dehydrating (reusing water after being treated); treating a sludge cake; burdening; pre-forming; forming; polishing; trimming; and forming an end product of a building material. According to the invention, solid and water in the black liquor or red liquor are separated by adopting a compound flocculation technology; after the separated water is treated, the water is reused for pulping; the separated solid is used for producing the building material, so that the environmental pollution caused by the black liquor or red liquor is thoroughly eliminated and a large amount of water for production is saved; the treating cost of the black liquor or red liquor is low; the equipment investment is less; the produced building material belongs to the comprehensive utilization of wastes; and the economic benefit is increased.

Description

technical field [0001] The invention belongs to the field of papermaking and pulping, and in particular relates to a recycling and comprehensive utilization process of pulping black liquor or red liquor. [0002] Background technique [0003] Black liquor, the waste liquor obtained after alkaline pulping and cooking, is dark brown and is called black liquor. Inorganic substances in black liquor include free sodium hydroxide, sodium silicate, sodium thiosulfate, sodium sulfide, sodium sulfite, sodium carbonate, etc. Organic matter in black liquor includes alkali lignin, vulcanized lignin, volatile organic acids, other lignin derivatives and trace amounts of phenolic organic matter. Discharging black liquor directly into rivers will cause pollution and should be treated. The treatment method is to evaporate and concentrate first, and then burn to recover the alkali. [0004] Red liquor, the waste liquor obtained after sulfite pulping and cooking, is brownish red, called re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): D21C11/02D21C11/04
Inventor 谢明文于翔
Owner 谢明文
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap