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Circulating utilization method of water used in pulping of wastepaper

A technology for water circulation and waste paper pulp, applied in the field of pulp and paper making, can solve problems such as the effective treatment of difficult-to-adhesive and anionic waste, and achieve the effects of quality improvement, production efficiency improvement, and water drainage speed improvement.

Inactive Publication Date: 2015-05-27
凌海东
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Problems solved by technology

[0006] Aiming at the problem that the prior art is difficult to effectively deal with stickies and anion garbage in the waste paper recycling system, the purpose of the present invention is to provide a method for adding resin adsorbent——SiO2 in the waste paper pulping process, Realize recycling of waste paper pulping water

Method used

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Effect test

Embodiment l

[0016] (1) Weigh SiO2 (solid) according to the weight ratio of SiO2 and recycled water at 8:100, and then add the SiO2 in the recycled water.

[0017] (2) The above mixed solution is fully reacted in the dissolution tank to generate a suspension containing flocs.

[0018] (3) After passing the above-mentioned suspension that formed flocs through a 180-mesh sieve, according to the addition amount of SiO2 (solid) to the absolute dry waste paper pulp of 3%, evenly add it to the waste paper hydraulic pulping - high concentration In the slurry tank after slag removal.

[0019] (4) After fully and uniformly mixing for 4 hours, the recycled waste paper pulp is screened and purified.

[0020] Compared with the packaging paper made from recycled pulp without adding SiO2, the ash content of the finished paper increased by 18%, the whiteness increased by 6%, and the strength index (breaking length and tear index) of the recycled pulp packaging paper added with SiO2 down less than 12%. ...

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Abstract

The invention discloses a circulating utilization method of water used in pulping of wastepaper, which comprises following steps: (1) diluting SiO2 into a concentration of 8-10% and sieving the diluted SiO2 through a sieve being 180-200 in meshes; (2) uniformly adding the sieved SiO2 to recycled wastepaper pulp according to a proportion that solid SiO2 accounts for 2-8% of the oven-dry wastepaper pulp, wherein the sieved SiO2 is added at any position between after repulping of the wastepaper and before papermaking of the wastepaper pulp; (3) uniformly mixing the SiO2 with the wastepaper pulp for 2-4 h and performing papermaking on a net. By means of the method, the quality of the circulating water is significantly improved, water filtering speed is increased by more than 30% and the COD value of the recycled regenerated water can be reduced by 35%. The circulating utilization method allows production to carry out for 3 days continuously without shutdown and can greatly increase the production efficiency. All-sealedly circulation of the water used in pulping and papermaking from wastepaper can be achieved.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, and relates to pulping and papermaking by utilizing waste paper and recycling of production water. By adopting the method, the recycling rate of production water can be improved, so as to achieve the degree of complete sealing and zero discharge. Background technique [0002] Since 2004, my country's waste paper pulping has accounted for more than half of my country's pulp output. Regenerated fiber made from recycled waste paper can not only be used to produce low-grade packaging paper and cardboard, but also can be mixed with middle-grade paper and cardboard such as writing paper, coated paper, and toilet paper. Utilizing waste paper for pulping can save papermaking fiber raw materials, save investment, save energy, and reduce pollution. More than 4m3 of wood is needed to produce 1t of natural chemical pulp, 5m3 of wood is needed to produce 1t of bleached chemical pulp, and only 1.3t of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/00
CPCD21F1/66
Inventor 凌海东
Owner 凌海东
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