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Treatment methods of paint wastewater and coated broken paper

A paint wastewater and coating technology, applied in the field of papermaking, can solve the problems of low recycling rate, achieve the effect of improving filler retention and ash retention rate, reducing anion garbage content, and increasing the ash content of base paper

Active Publication Date: 2018-01-09
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for treating paint wastewater and coated broken paper, which can solve the technical problem of low recycling rate of useful components in paint wastewater and coated broken paper existing in the prior art

Method used

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  • Treatment methods of paint wastewater and coated broken paper
  • Treatment methods of paint wastewater and coated broken paper
  • Treatment methods of paint wastewater and coated broken paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take OMC broken paper, paint wastewater, PA modified PAC to treat paint wastewater, paint wastewater concentration 4%, PA modified PAC addition is 5kg; use 0.5kg cationic polyacrylamide (C-PAM) modified PAC to treat OMC Wastewater, C-PAM molecular weight 1000k Da, charge density 5meq / g. Control the ratio of OMC broken paper and paint wastewater to 1:0.1. After mixing, the mixture was refined with a Wally refiner, and the difference in freeness before and after refining was controlled to be 50 mL. Finally, 3 kg of ultra-high molecular weight polyacrylamide was added, with a molecular weight of 20,000 kDa and a charge density of 10 meq / g. After mixing evenly, make slurry with fresh slurry according to the ratio of 20 / 80. Among them, fresh pulp accounts for 80%, and the ratio of fresh pulp is 20 / 70 / 10 to prepare NBKP, LBKP, BC or APMP. Finally, fillers, starch, cationic polyacrylamide, and anionic filter aid are added to prepare a thin slurry, and a small-scale sheet-mak...

Embodiment 2

[0048] Pump the slurry and paint waste water in the OMC broken paper barrel tank to the NBKP refining intermediate tank of the stock stock preparation section, and refine the OMC broken paper and paint mixture through one of the 2 NBKP refining lines, and then and NBKP enter the NBKP pulping tower according to a certain ratio, and finally through the direct pulping process, the OMC broken paper and coating wastewater are mixed and refined, and the mixed pulp enters the paper machine papermaking process according to a certain ratio. Among them, the concentration of paint wastewater is controlled at 18%, and 4kg PAC is added for treatment, and the addition point is the paint wastewater tank; the concentration of OMC broken paper is controlled at 5.5%, and PEI modified PAC is added to treat OMC broke paper. The molecular weight of PEI is 200k Da, and the charge The density is 8meq / g, the addition amount is 2k g, and the addition point is from the OMC barrel tank to the pump suctio...

Embodiment 3

[0051]Pump the slurry and paint waste water in the OMC broken paper barrel tank to the NBKP refining intermediate tank of the stock stock preparation section, use one of the 2 LBKP refining lines to refine the OMC broken paper and paint mixture, Then it enters the LBKP pulping tower with LBKP according to a certain ratio, and finally through the direct pulping process, the OMC broken paper and coating wastewater are mixed and refined, and the mixed pulp enters the paper machine papermaking process according to a certain ratio. Among them, the concentration of paint wastewater is controlled at 70%, and 0.5kg PAC is added for treatment. The adding point is the paint wastewater tank; the concentration of OMC broken paper is controlled at 4.5%, and PAE modified PAC is added to treat OMC broke paper. The molecular weight of PAE is 1200k Da, and the charge The density is 0.5meq / g, the addition amount is 5k g, and the addition point is from the OMC barrel tank to the pump suction inle...

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Abstract

The invention provides a treatment method for coating waste water and coating broke. The method comprises the following steps of conducting treatment on the coating waste water and the coating broke with cationic coagulant, so that anionic garbage in the coating waste water and the coating broke is neutralized; adding the coating waste water and the coating broke treated through the cationic coagulant into a paper machine slurry treatment system for treatment; after treatment is completed through the paper machine slurry treatment system, adding cationic flocculant for treatment, so that the content of the anionic garbage in the coating waste water and the coating broke is further lowered, and the filling material retention rate and the ash content retention rate in the paper machine paper-making process are raised. According to the method, the anionic garbage is controlled through PAC or modified PAC, and furthermore, pigment and latex in the coating broke can be effectively utilized. The paper ash content of body paper can be increased, wet part reservation can be further effectively improved, and body paper making cost is lowered.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a treatment method for coating waste water and coated broken paper. Background technique [0002] The equipment currently used for coating is mainly Off Machine Coating, and the common features of these paper machines are: fast speed and high output. Now the speed of high-speed cultural paper machines is generally above 1000m / min, and the speed of cardboard machines is above 600m / min. A considerable amount of paint is used in the papermaking process of coated paper. When changing paper grades, switching, and shutting down, it is necessary to clean a large number of paints in pipes and tanks. According to statistics, only tanks and pipelines clean out about 2000 tons of paint waste water (solid content is 3-5%) every day, that is, more than 60 tons of dry paint. If the paint wastewater is rationally used, it can not only reduce the cost of waste residue treatment, but also t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/02D21B1/32C02F1/56C02F1/52C02F103/28
CPCC02F1/5245C02F1/56C02F2103/28D21B1/322D21C5/022Y02W30/64
Inventor 董郑伟於旺盛闫培养杨露壮欢刘春
Owner GOLD EAST PAPER JIANGSU
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