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High-whiteness bleaching method for high-yield bamboo wood pulp

A high-yield pulp and high-brightness technology, which is applied in the field of pulp and papermaking, can solve the problems of poor liquid penetration, difficulty in achieving high-brightness bleaching goals, and low reaction efficiency, so as to increase the limit of bleaching brightness and waste water. Easy to manage and improve the effect of utilization

Active Publication Date: 2010-02-03
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to achieve the bleaching target of high brightness by only using hydrogen peroxide to bleach high-yield bamboo pulp
[0006] The structure of bamboo is tight, the surface is rich in silicon cells and other miscellaneous cells, the liquid penetration is poor, and the reaction efficiency with bleaching agents is low

Method used

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  • High-whiteness bleaching method for high-yield bamboo wood pulp

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Effect test

Embodiment 1

[0026] The specific bleaching implementation method is as follows:

[0027] 1. Intensified mechanical and chemical treatment Cizhu is taken from Guangxi Zhuang Autonomous Region. After slicing and removing impurities, it is soaked in water at room temperature. After pre-steaming in a steam chamber with a pressure of 1 atmosphere and a temperature of 105°C for 10 to 15 minutes, use a compression ratio of 1. : 4 screw extruders extrude, the Cizhu material uses 2%NaOH, 1.6%Na relative to the absolute dry material quality after extrusion 2 SO 3 Carry out chemical impregnation treatment with 0.2% DTPA, the treatment temperature is 50°C, the treatment time is 30min, and the slurry concentration is 30%wt, followed by secondary screw extrusion, and then the high-consistency refiner is used for refining, and the concentration of the slurry is 30%wt, control different refining energy inputs, and adjust pulp freeness to 260-280mlCSF. The yield of natural-color bamboo high-yield pulp is...

Embodiment 2

[0034] Cizhu (taken from Guangxi), sliced ​​and removed, soaked in water at room temperature, sent to the steaming chamber, pre-steamed at normal pressure for 10-15 minutes, and extruded in a screw extruder (compression ratio is 1: 4). After extrusion, the bamboo material uses 2% NaOH, 2% H 2 o 2 , 0.2% DTPA dosage for chemical treatment, the material concentration is 30%, the treatment temperature is 50°C, and the treatment time is 30min. Then use a screw extruder to extrude and send it to a high-consistency atmospheric pressure refiner for refining, control different refining energy inputs, and adjust the pulp freeness to 260-280mlCSF. The yield of natural-color bamboo high-yield pulp is 87.2%. The ground slurry is depotentialized and screened, and the depotentialization conditions are: 3% slurry concentration, 90° C. for 15 minutes. Bamboo high yield pulp is used for bleaching. For the implementation process of pulping, bleaching, copying and testing, see figure 1 . ...

Embodiment 3

[0044] The specific bleaching implementation method is as follows:

[0045] 1. Intensified mechanical and chemical treatment Cizhu is taken from Guangxi Zhuang Autonomous Region. After slicing and removing impurities, it is soaked in water at room temperature. After pre-steaming in a steam chamber with a pressure of 1 atmosphere and a temperature of 105°C for 10 to 15 minutes, use a compression ratio of 1. : 4 screw extruders are extruded to make the bamboo chip material reach liquid: material=2.5~3.5: 1 liquid absorption ratio, the Cizhu material uses 2%NaOH, 1.6%Na relative to the absolute dry material quality after extrusion 2 SO 3 Carry out chemical impregnation treatment with 0.2% DTMPA, the treatment temperature is 50 ℃, the treatment time is 30min, the treatment slurry is thick 20%wt, then carry out secondary screw extrusion, and then use a high-consistency refiner to refine, and the concentration of the slurry is 20%wt, control different refining energy inputs, and ad...

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Abstract

The invention discloses a high-whiteness bleaching method for high-yield bamboo wood pulp. The high-whiteness bleaching method comprises the following steps: firstly, using an extruder to carry out enhanced mechanical treatment on pretreated bamboo sheets; using a transition metal ion remover and the like to carrying out chemical impregnating treatment on extruded cizu materials; then, carrying out secondary spiral extrusion before pulping, straightening and screening; secondarily, using a peroxide activating agent and peroxide to carry out the activating treatment of 20 percent by weight of bamboo pulp at a treatment temperature of 60-90 DEG C for 30-60 minutes; thirdly, using a chlorine-free bleaching medicine H2O2 to carry out high-concentration rested bleaching of 10-30 percent by weight of bamboo pulp at a treatment temperature of 60-90 DEG C for 60-180 minutes; and using a decoloring agent of thiourea dioxide to decolour the bamboo pulp, remove a ground color, adjust a color phase and improve the bleaching white content. The invention forcefully and mechanically treats the bamboo sheets, synchronously realizes pulping, the removal of transition metal ions and deep extractionsand the break of complex cells, reduces the consumption of the bleaching medicine and improves the bleaching efficiency.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to a bleaching method for high-yield bamboo pulp. Background technique [0002] my country is one of the countries with the richest bamboo resources in the world, with a bamboo forest area of ​​4.2 million hectares, accounting for a quarter of the world. The development of high-yield bamboo pulp needs to overcome the following problems: (1) The problem of pre-impregnation. Bamboo material is hard and difficult to chemically impregnate, which has been fully reflected in the production of bamboo chemical pulp. The soaking and pretreatment technology of high-yield bamboo pulp is the key to improving the refining uniformity of bamboo pulp and reducing energy consumption; (2) The problem of difficult bleaching. The content of color-forming chemical components such as lignin in the high-yield bamboo pulp and the distribution in the fiber cell layer are difficult to bleach to high ...

Claims

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Application Information

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IPC IPC(8): D21C9/16D21C1/10D21H21/32D21H17/66D21H17/63D21H17/64D21H17/14D21H17/10D21H17/07D21H17/09
Inventor 房桂干沈葵忠施英乔邓拥军李萍丁来保韩善明焦健梁芳敏胡剑民
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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