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Control method of anion garbage in mixed pulp containing high yield pulp

A technology of anion garbage and high-yield pulp, which is applied in the field of controlling the level of anion garbage, can solve the problems of deterioration of paper sheet formation, increase of white water COD value, reduction of paper strength, opacity and whiteness, etc., and achieve the effect of reducing load

Active Publication Date: 2016-08-17
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared to bleached kraft pulp, high-yield pulp contains a higher content of dissolved colloidal substances (DCS), also known as anionic trash, which has a negative impact on the papermaking process, making the papermaking wet-end system Instability will bring various adverse effects to the paper machine, such as poor retention and drainage, and deterioration of paper sheet formation; increase the amount of retention aids and sizing agents; reduce paper strength, opacity, Quality indicators such as whiteness; affect the efficiency of the fiber recovery system, increase the COD value of white water, and increase the load of water treatment

Method used

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  • Control method of anion garbage in mixed pulp containing high yield pulp
  • Control method of anion garbage in mixed pulp containing high yield pulp
  • Control method of anion garbage in mixed pulp containing high yield pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for controlling anionic garbage in mixed pulp containing high-yield pulp, comprising the following steps:

[0017] Measure 5 parts of the mixed slurry containing high-yield slurry, and under the condition of stirring speed of 700rpm, add the aqueous solution of heavy calcium carbonate with a mass concentration of 20%, stir for 30s, and add functional polymer with a mass concentration of 0.2% respectively Fennopol FP-725 (Camilla) aqueous solution, and then stirred for 30s, respectively added cationic polyacrylamide aqueous solution with a mass concentration of 0.05%, mixed evenly, to obtain a mixed slurry containing high-yield slurry with controlled anionic garbage; measure.

[0018] The dry weight ratio of mixed pulp containing high yield pulp, heavy calcium carbonate and cationic polyacrylamide is 1:25%:0.05%.

[0019] The dry weight ratio of the mixed pulp containing high-yield pulp to the functional polymer Fennopol FP-725 added separately is 1:0; 1:0.05%; ...

Embodiment 2

[0030] A method for controlling anionic garbage in mixed pulp containing high-yield pulp, comprising the following steps:

[0031] Measure 5 parts of the mixed slurry containing high-yield pulp, and under the condition of a stirring speed of 500rpm, respectively add an aqueous solution of heavy calcium carbonate with a mass concentration of 10%, stir for 10 seconds, and then add functional polymer with a mass concentration of 0.1% Fennopol FP-725 (Camilla) aqueous solution, and then stirred for 10 s, respectively added cationic polyacrylamide aqueous solution with a mass concentration of 0.02%, mixed evenly, to obtain a mixed slurry containing high-yield slurry with controlled anionic garbage; measure.

[0032] The dry weight ratio of mixed pulp containing high yield pulp, heavy calcium carbonate and cationic polyacrylamide is 1:15%:0.02%.

[0033] The dry weight ratio of the mixed pulp containing high-yield pulp to the functional polymer Fennopol FP-725 added separately is 1:...

Embodiment 3

[0044] A method for controlling anionic garbage in mixed pulp containing high-yield pulp, comprising the following steps:

[0045] Measure 5 parts of the mixed slurry containing high-yield slurry, under the condition of stirring speed of 1000rpm, add the heavy calcium carbonate aqueous solution with the mass concentration of 30%, stir for 60s, add the functional polymer with the mass concentration of 0.4% respectively Fennopol FP-725 (Camilla) aqueous solution, and then stirred for 60 s, respectively added cationic polyacrylamide aqueous solution with a mass concentration of 0.1%, mixed evenly, to obtain a mixed slurry containing high-yield pulp with controlled anionic garbage; measure.

[0046] The dry weight ratio of mixed pulp containing high yield pulp, heavy calcium carbonate and cationic polyacrylamide is 1:30%:0.05%.

[0047] The dry weight ratio of the mixed pulp containing high-yield pulp to the functional polymer Fennopol FP-725 added separately is 1:0; 1:0.05%; 1:0....

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Abstract

The invention discloses a method for controlling anionic trash in mixed pulp with high pulp yield. The method comprises the following steps: measuring the mixed pulp with high pulp yield, adding ground calcium carbonate water solution with the mass concentration of 10%-30% under the condition that the stirring speed is 500-1000rpm, stirring for 10-60s, adding functional polymer Fennopol FP-725 water solution with the mass concentration of 0.1%-0.4%, stirring again for 10-60s, adding cationic polyacrylamide water solution with the mass concentration of 0.02%-0.1%, and evenly mixing to obtain mixed pulp with high pulp yield, wherein anionic trash in the mixed pulp is controlled. According to the method, the amount of the anionic trash in the mixed pulp with high pulp yield can be reduced, the retention of fibers and fillers can be improved, and the load of COD in white water can be reduced.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking engineering, and in particular relates to a method for controlling the level of anion trash in mixed pulp containing high-yield pulp. Background technique [0002] High-yield pulp, namely bleached chemical thermomechanical pulp (BCTMP), alkaline hydrogen peroxide mechanical pulp (APMP), chemically pretreated alkaline hydrogen peroxide mechanical pulp (P-RC APMP), is known for its high yield , less pollution, etc., and can provide many functional advantages to paper, such as high bulk, high stiffness, good printability, etc., and has been widely used in various paper and cardboard in recent years. However, compared to bleached kraft pulp, high-yield pulp contains a higher content of dissolved colloidal substances (DCS), also known as anionic trash, which has a negative impact on the papermaking process, making the papermaking wet-end system Instability will bring various adverse ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/04
Inventor 刘洪斌王雅婷陈翠
Owner TIANJIN UNIV OF SCI & TECH