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Whitewater processing method

A treatment method, white water technology, applied in the field of papermaking, can solve problems such as the deterioration of primary retention rate and filler retention rate, the effect of chemical additives, and the increase of system charge, so as to reduce the conductivity and COD, and improve the primary rate. The retention rate and the effect of increasing the number of reuses

Active Publication Date: 2013-05-08
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the white water is directly reused without treatment, various substances in the white water will continue to accumulate with the increase in the number of cycles, resulting in an increase in the charge of the system and an increase in polyelectrolytes, which will eventually affect the effect of the chemical additives. The primary retention rate and filler retention rate of the paper made from pulp become worse, and the paper has quality problems such as holes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take an appropriate amount of the above-mentioned white water sample, stir the white water sample and slowly add NaOH solution with a mass concentration of 0.05%, adjust the pH of the white water sample to 8; add a mixed solution of polyaluminum chloride and polyacrylamide to the white water sample , the mass concentration of polyaluminum chloride in the mixed solution is 5%, the mass concentration of polyacrylamide is 0.1%, mix well until the total mass concentration of polyaluminium chloride and polyacrylamide in the white water sample is 1000ppm.

[0017] A slurry with a mass concentration of 1% was added to the white water. In this implementation, the slurry is composed of 30% long-fiber chemical pulp and 70% short-fiber chemical pulp. It can be understood that the present invention does not limit the specific composition of the slurry. In other embodiments, the slurry can be adjusted according to specific needs. The ingredients are adjusted accordingly. After unif...

Embodiment 2

[0025] Take an appropriate amount of the above-mentioned white water sample, stir the white water sample and slowly add a NaOH solution with a mass concentration of 0.05% at the same time to adjust the pH of the white water sample to 14, add a mixed solution of polyaluminum chloride and polyacrylamide to the white water sample, The mass concentration of polyaluminum chloride in the mixed solution is 1%, and the mass concentration of polyacrylamide is 0.5%. Mix evenly until the total mass concentration of polyaluminium chloride and polyacrylamide in the white water sample is 3000ppm.

[0026] Add the slurry of mass concentration 1% to this white water, this slurry is made up of 30% long fiber chemical pulp and 70% short fiber chemical pulp in this implementation, it can be understood that the present invention is not limited to the concrete composition of slurry, in In other embodiments, the composition of the slurry can be adapted and adjusted according to specific requirements...

Embodiment 3

[0033] Take an appropriate amount of the above-mentioned white water sample, stir the white water sample and slowly add NaOH solution with a mass concentration of 0.05% to adjust the pH of the white water sample to 11, add a mixed solution of polyaluminum chloride and polyacrylamide to the white water sample, The mass concentration of polyaluminum chloride in the mixed solution is 3%, and the mass concentration of polyacrylamide is 0.3%. Mix evenly until the total mass concentration of polyaluminum chloride and polyacrylamide in the white water sample is 2000ppm.

[0034] To the white water, add a slurry with a mass concentration of 1%. In this implementation, the slurry is composed of 30% long-fiber chemical pulp and 70% short-fiber chemical pulp. It can be understood that the present invention does not limit the specific composition of the slurry. In other embodiments, the composition of the slurry can be adapted and adjusted according to specific requirements. After uniform...

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Abstract

The invention relates to a whitewater processing method comprising the steps that: the pH value of the whitewater is regulated to 8-14; a certain amount of a mixed solution of a flocculating agent and a cationic polymer is added to the whitewater, until the total mass concentration of the flocculating agent and the cationic polymer in the whitewater is 1000-3000ppm. In the mixed solution, the mass concentration of the flocculating agent is 1-5%, and the mass concentration of the cationic polymer is 0.1-0.5%. According to the invention, papermaking whitewater is processed by using the whitewater processing method provided by the invention, and is then used in preparing slurry. Therefore, paper one-time retention rate and filler retention rate can be substantially improved, and paper bursting index and tensile strength index are improved to a certain extent. Also, when the slurry is used in papermaking, concentration, turbidity, conductivity, and COD of collected under-mesh whitewater are greatly reduced, such that whitewater recycling time can be increased.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a method for treating papermaking white water. Background technique [0002] Papermaking wastewater mainly includes black liquor, middle stage water and white water. Among them, white water refers to the water extracted from the wire section and press section of the paper machine during the sheet forming process. White water contains a lot of fine fibers, inorganic fillers, and various chemical additives. Therefore, the industry usually reuses white water for the preparation of papermaking pulp, which is not only beneficial to environmental protection, but also can rationally utilize various useful components in white water to reduce material costs. However, if the white water is directly reused without treatment, various substances in the white water will continue to accumulate with the increase in the number of cycles, resulting in an increase in the charge of the system and an inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F103/28
Inventor 王仁荣张明陈剑郝妮刘翔飞
Owner GOLD EAST PAPER JIANGSU
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