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A kind of application method of lime mud in papermaking filling

An application method and technology of lime mud, applied in the field of pulp and paper making, can solve the problems of inability to reduce the adverse effects of filling, complex process operation, high production cost, etc., and achieve the goal of improving lime mud retention rate, simple process and low production cost Effect

Active Publication Date: 2017-01-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some technologies including cell cavity filling and filler / fine fiber compounding can improve the paper strength and filler retention rate of filled paper to a certain extent, they cannot reduce the adverse effects of filling on sizing
Studies have shown that the modification of white mud with starch-sodium stearate compound can improve the sizing efficiency of AKD to a certain extent (Hu Jianrong, Zhao Lihong, He Beihai. Modified white mud refined calcium carbonate filling and sizing characteristics Research [J]. Paper Science and Technology, 2012,31(2):46-51), but this method has limited effect
And the above methods all have the same problem, that is, it is difficult to realize the application in industry due to the complexity of the process operation or the high production cost.

Method used

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  • A kind of application method of lime mud in papermaking filling
  • A kind of application method of lime mud in papermaking filling
  • A kind of application method of lime mud in papermaking filling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 2g (absolutely dry) plant fiber raw material (mass ratio of chemical mechanical pulp: chemical reed pulp: bleached kraft softwood pulp = 4:3:3) into 1500ml of water, and use a decomposer to decompose at 5000 rpm.

[0024] (2) Add 31.5% (based on the absolute dry mass of plant fiber raw material) white mud, 0.75% (based on the absolute dry mass of plant fiber raw material) cationic starch, 0.25% (based on the absolute dry mass of plant fiber raw material) in the slurry that step (1) obtains successively The absolute dry mass of the fiber raw material) AKD, 0.04% (based on the absolute dry mass of the plant fiber raw material) cationic polyacrylamide, after stirring evenly, copy the slices on a fast slicer.

[0025] (3) After equilibrating the moisture in the hand-sheet obtained in (2) for 24 hours under the conditions of (23±1)°C and (50±2)% relative humidity, according to GB / T 1540-2002, GB / T 12914- 2008, GB / T 454-2002, GB / T 455-2002 and GB / T22877-2008 Determina...

Embodiment 2

[0035] (1) Add 2g (absolutely dry) plant fiber raw material (mass ratio of chemical mechanical pulp: chemical reed pulp: bleached kraft softwood pulp = 4:3:3) into 1500ml of water, and use a decomposer to decompose at 5000 rpm.

[0036] (2) in the slurry that step (1) obtains successively, add 39% (based on the dry mass of plant fiber raw material) white mud, 0.75% (based on the dry mass of plant fiber raw material) cationic starch, 0.25% (based on the dry mass of plant fiber raw material) The absolute dry mass of the fiber raw material) AKD, 0.04% (based on the absolute dry mass of the plant fiber raw material) cationic polyacrylamide, after stirring evenly, copy the slices on a fast slicer.

[0037] (3) After equilibrating the moisture in the hand-sheet obtained in (2) for 24 hours under the conditions of (23±1)°C and (50±2)% relative humidity, according to GB / T 1540-2002, GB / T 12914- 2008, GB / T 454-2002, GB / T 455-2002 and GB / T22877-2008 Determination of paper Cobb value, te...

Embodiment 3

[0047] (1) Add 2g (absolutely dry) plant fiber raw material (mass ratio of chemical mechanical pulp: chemical reed pulp: bleached kraft softwood pulp = 4:3:3) into 1500ml of water, and use a decomposer to decompose at 5000 rpm.

[0048] (2) Disperse 19% (based on the absolute dry mass of the plant fiber raw material) lime mud in water to form a suspension with a mass fraction of 1%. Then add 0.04% (based on the dry mass of the plant fiber raw material) cationic polyacrylamide, 0.75% (based on the dry mass of the plant fiber raw material) cationic starch, and 0.25% (based on the dry mass of the plant fiber raw material) AKD. Stir with a magnetic stirrer at a speed of 600 rpm for 10 min to obtain a white mud floc suspension.

[0049] (3) Pour the white mud floc suspension obtained in the step (2) into the slurry obtained in the step (1), stir it evenly, and then use a quick slicer to slice.

[0050] (4) After equilibrating the moisture in the hand-sheet obtained in step (3) for...

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Abstract

The invention discloses an application method of white clay in papermaking filling. The method comprises the following steps: (1) dispersing the white clay in water to form a suspension with the mass percent of 1%; (2) sequentially adding cationic polyacrylamide, cationic starch and AKD into the white clay suspension and stirring for 10 to 15 minutes under the revolving speed of 500rpm to 1000rpm so as to obtain a white clay flocculant polymer suspension; and (3) pouring the white clay flocculant polymer suspension obtained in the step (2) into a defibered pulp, evenly stirring and then manually dehydrating the pulp on a rapid sheet former. The method is simple, convenient and effective, low in cost and strong in operability, and ensures that the sizing efficiency of the AKD in the paper added with the white clay is obviously improved while the strength of the paper and the retention rate of the white clay are improved, thereby greatly improving the application performance of the white clay taken as a papermaking filler.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to an application method of lime mud in papermaking filling. Background technique [0002] Lime mud is a by-product of pulping black liquor alkali recovery process in paper mills, and its main component is calcium carbonate. According to different pulping raw materials, white mud can be divided into two categories: wood pulp white mud and non-wood pulp white mud. Due to the relatively low impurity content of wood pulp lime mud, it can be recycled by calcination and recovery of lime. Non-wood pulp lime mud cannot be reused due to its high silicon content. my country is a big non-wood pulping country, so a large amount of non-wood pulp white mud is produced every year. In order to avoid waste of resources and environmental pollution, some domestic paper mills refine lime mud into calcium carbonate for paper filling. [0003] Compared with pulp fiber, white clay is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/68D21H21/16
Inventor 赵丽红彭元何北海
Owner SOUTH CHINA UNIV OF TECH