Control agent of dissolved and colloidal substances in paper machine circulating off-machine water and use method thereof

A technology of dissolving colloids and control agents, which is applied in the direction of inorganic compound addition, paper, papermaking, etc., can solve the problems of decreased efficiency of the retention system, a large amount of foam in the white water system, and broken holes in the paper web, so as to improve and reduce the closed circulation of white water. The effect of DCS content and water consumption reduction per ton of paper

Inactive Publication Date: 2010-04-07
GOLD EAST PAPER JIANGSU
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the investigation and research, it is found that after the paper machine has been running stably for a period of time under the condition of white water closed circulation, although advanced particle retention and drainage technology and anion waste control technology are adopted, a large amount of foam will still appear in the white water system, and the retention system Decreased efficacy, increased dosage of retention aids, problems such as holes and spots in the paper web
When the paper machine system becomes dirty, the problem is generally solved by changing the water and adding a defoamer, so that the white water cannot be fully closed and recycled
Practical research has found that the root cause of the failure of fully closed recycling of white water is the continuous accumulation of DCS in the white water system

Method used

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  • Control agent of dissolved and colloidal substances in paper machine circulating off-machine water and use method thereof

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Effect test

Embodiment 1

[0013] For the production of coated base paper, the white water of the paper machine is closed cycle, and the DCS control agent is a compound of PAC and PA, wherein the ratio of PAC to PA is 50:1. PA is medium to high molecular weight, high positive charge density, the addition point is short cycle white water, the addition amount of PAC is 250ppm (for tons of paper), and PA is 5ppm (for tons of paper). The white water of the paper machine was fully closed for one month, the DCS content in the white water was 835mg / L, the average daily paper breaking time of the paper machine was reduced from 33.8min to 9.2min, and the water consumption per ton of paper was reduced from 8.594m 3 Descend to 5.642m 3 . At the same time, the amount of auxiliary agent is reduced, and the strength of paper is improved.

Embodiment 2

[0015] The DCS control agent is a compound of PAC and PVAD, wherein the ratio of PAC to PVAD is 70:1. PVAD is characterized by high molecular weight and high positive charge density. The addition point is short-circulation white water, the addition amount of PAC is 200ppm (for tons of paper), and PVAD is 3ppm (for tons of paper). The white water of the paper machine was fully closed for one month, and the DCS content in the white water was 855mg / L. The average daily paper breaking time of the paper machine was reduced from 33.8 minutes to 9.4 minutes, and the water consumption per ton of paper dropped to 5.026m 3 . At the same time, the amount of retention additives is reduced, and the paper strength is also improved.

Embodiment 3

[0017] The DCS control agent is a compound of CPAM and PA, wherein the ratio of CPAM to PA is 15:10. CPAM is characterized by high molecular weight, medium and low positive charge density, and PA medium and high molecular weight, high positive charge density. The addition point is short-circulation white water, the addition amount of CPAM is 15ppm (for tons of paper), and PA is 10ppm (for tons of paper). The white water of the paper machine was fully closed for one month, the DCS content in the white water was 855mg / L, the average daily paper breaking time of the paper machine was reduced to 11.3min, and the water consumption per ton of paper was reduced to 7.024m 3 . At the same time, the amount of retention additives is reduced, and the paper strength is also improved.

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Abstract

The invention discloses control agent of dissolved and colloidal substances (DCS) in paper machine circulating off-machine water and a use method thereof. The control agent is prepared by mixing the polymeric aluminium and cationic polymer, wherein the mass ratio of the polymeric aluminium to the cationic polymer is 87-99%:1-13%; the cationic polymer is one or the mixture of some types of polyamine, cationic polyacrylamide and polyvinyl amidine; and control agent is added into the paper machine short circulation off-machine water or paper stock under flow, the use level of polymeric aluminium is 100ppm-300ppm and the use level of cationic polymer is 3ppm-15ppm. The invention greatly reduces the DCS content in the paper machine circulating off-machine water, ensures that the DCS content in the circulating off-machine water is controlled below 900mg/L, improves the sealing and circulating degree of the off-machine water, reduces water consumption of paper, and simultaneously improves the performances of paper stock reservation and paper machine operation and the performance of paper.

Description

technical field [0001] The invention relates to a control agent for dissolving colloids in circulating white water for papermaking, in particular to a control agent for dissolving colloids (DCS) in circulating white water for paper machines and a method for using the same. Background technique [0002] Considering the environment and production cost, the white water system of the paper mill is required to be closed and circulated to reduce the use of fresh water and waste water discharge. At the same time, useful fibers and fillers can be recovered from the circulating white water to reduce production costs. However, with the improvement of the degree of closed circulation of white water and the increase of the number of white water cycles, harmful substances in white water are gradually accumulated, and the main harmful substances are dissolved colloids (DCS). In order to effectively control the impact of DCS on production and product quality in circulating white water, ani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/12D21H17/66D21H17/56D21H17/45D21H17/53D21H23/04D21H17/36
Inventor 马金霞王仁荣於旺盛马兴虎
Owner GOLD EAST PAPER JIANGSU
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