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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
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  • 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 secondary pollution and wasting a lot of water and sludge resources (130 million tons of dry sludge and consumption of 3.947 billion m 3 water), high treatment costs

Method used

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  • Recycling comprehensive utilization technology for pulping black liquor or red liquor
  • Recycling comprehensive utilization technology for pulping black liquor or red liquor

Examples

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Effect test

Embodiment 1

[0054] Embodiment 1: the processing of black liquor

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

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

[0057] Dehydration: Send the pretreatment liquid into the filter press dehydrator ZQWY-50, so that the flocculated solids in the pretreatment liquid are press-filtered into sludge cakes, and the detached 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 dosage is...

Embodiment 2

[0066] Embodiment 2: the processing of red liquor

[0067] Taking the sulfite pulping of Yueyang Hongyun Paper Technology Research Institute Co., Ltd. as an example, the red liquor is comprehensively utilized and treated through the following process.

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

[0069] Dehydration: Send the pretreatment liquid into the filter press dehydrator ZQWY-50, so that the flocculated solids in the pretreatment liquid are press-filtered into sludge cakes, and the detached 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 chelati...

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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

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Application Information

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IPC IPC(8): D21C11/02D21C11/04
Inventor 谢明文于翔
Owner 谢明文
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