Waste corrugated board white water treatment method

A corrugated cardboard and processing method technology, applied in the field of papermaking, can solve the problems of difficult removal of soluble substances, fluctuating product quality, increased paper breakage, etc., so as to reduce the clogging of the forming wire or the press felt, reduce the dosage, and reduce the content of soluble substances. Effect

Inactive Publication Date: 2015-07-29
GUANGXI UNIV
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  • Claims
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Problems solved by technology

With the increase of waste paper pulping and white water closed circulation, various harmful substances in the white water circulation system, such as DCS, extracts, sulfate and other soluble substances, accumulate to a certain period of time and to a certain extent, which will cause anion garbage and microbial growth. , secondary stickies and salt deposition and corrosion, resulting in fluctuations in product quality, increased paper breaks, difficulty in sizing, etc.
[0003] At present, paper-making enterprises adopt waste paper white water treatment technology, which is difficult to remove soluble substances in the system, and even cannot be removed from the system, and will still remain in the white water system. When it reaches a certain level, many negative impact highlighted

Method used

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  • Waste corrugated board white water treatment method

Examples

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Effect test

Embodiment 1

[0032] Take 500mL waste corrugated white water and put it into a beaker, add concentrated sulfuric acid to adjust the pH=4, put it on a stirrer and stir at 200r / min, add FeSO to the white water first 4 , then add H 2 o 2 , adding FeSO 4 and H 2 o 2 Concentrations in white water are 400mg / L and 180mg / L respectively. After reacting for 30min, adjust the pH value of the reacting white water to 7, aerate and stir for 20min, then add polyacrylamide (PAM) for flocculation, and the added polyacrylamide ( The concentration of PAM) in white water is 2mL / L, after standing for 30min, filter with filter paper to obtain the waste corrugated paper white water water sample after treatment, add white water to waste corrugated paper pulp and carry out sheet copying in PTI sheet machine, quantification is 110g / m 2 . After testing, white water DCS removal rate = 81.2%, COD removal rate = 72.7%, chroma removal rate = 48.8%; the tensile index of waste corrugated paper increased by 13.8%, the...

Embodiment 2

[0034] Take 500mL of waste corrugated paper white water and put it into a beaker, add concentrated sulfuric acid to adjust the pH=5, place it on a stirrer and stir at 200r / min, add FeSO into the white water first 4 , then add H 2 o 2 , adding FeSO 4 and H 2 o 2 Concentrations in white water are 350mg / L and 240mg / L respectively. After reacting for 30min, adjust the pH value of reaction white water to 7, aerate and stir for 20min, then add polyacrylamide (PAM) for flocculation, and the added polyacrylamide ( The concentration of PAM) in white water is 2mL / L, after standing for 30min, filter with filter paper to obtain the treated waste corrugated paper white water water sample, add to waste corrugated paper pulp and carry out sheeting in PTI sheet machine, quantification is 110g / m 2 . After testing, white water DCS removal rate = 83.6%, COD removal rate = 74.5%, chroma removal rate = 51.2%; the tensile index of waste corrugated paper increased by 17.8%, the burst resistance...

Embodiment 3

[0036] Take 500mL waste corrugated white water and put it into a beaker, add concentrated sulfuric acid to adjust the pH=6, put it on a stirrer and stir at 200r / min, add FeSO into the white water first 4 , then add H 2 o 2 , adding FeSO 4 and H 2 o 2 Concentrations in white water are 450mg / L and 220mg / L respectively. After reacting for 30min, adjust the pH value of reaction white water to 7, aerate and stir for 20min, then add polyacrylamide (PAM) for flocculation, and the added polyacrylamide ( The concentration of PAM) in white water is 2mL / L, after standing for 30min, filter with filter paper to obtain the treated waste corrugated paper white water water sample, add to waste corrugated paper pulp and carry out sheeting in PTI sheet machine, quantification is 110g / m 2 . After testing, white water DCS removal rate = 81.8%, COD removal rate = 71.5%, chroma removal rate = 47.4%; the tensile index of waste corrugated paper increased by 15.8%, the burst resistance increased ...

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Abstract

The invention discloses a waste corrugated board white water treatment method. The method comprises the following steps: adjusting pH of waste corrugated board white water to be 4-6, adding a certain amount of FeSO4 and H2O2 in a stirring state, and carrying out aeration, flocculation and filtering so as to complete the white water process, wherein the concentrations of FeSO4 and H2O2 in the white water is 350-450 mg/L and 180-240 mg/Lm respectively and the reaction time is 30 min. Since white water is treated through the method, the DCS content, COD and chromaticity of the waste corrugated board white water are obviously reduced, and the white water can be reused for preparation of waste corrugated board slurry; in addition, the tensile index, bursting strength, tear resistance and other properties of the waste slurry are improved.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a white water treatment method for waste corrugated cardboard (OCC). Background technique [0002] White water is the water extracted from the wire section and press section of the paper machine during the paper forming process. It is the largest and most important papermaking wastewater in paper mills. White water contains a large amount of fine fibers, inorganic fillers, and various chemical additives. , White water reuse can greatly reduce the consumption of fresh water, reduce waste water discharge, and reduce the loss of fibers and fillers. With the increase of waste paper pulping and white water closed circulation, various harmful substances in the white water circulation system, such as DCS, extracts, sulfate and other soluble substances, accumulate to a certain period of time and to a certain extent, which will cause anion garbage and microbial growth. , Secondary stickies and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/28
Inventor 骆莲新李明富李馨胡玲玉闫兆晴文凤
Owner GUANGXI UNIV
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