Process for removing stickies in waste paper pulping process

A technology of pulping process and stickies, which is applied in the field of papermaking, can solve the problems of dust spots, affecting production costs, high cost of biological enzyme treatment, etc., and achieve the effect of reducing the content and solving the obstacles of stickies

Active Publication Date: 2017-12-15
SHANDONG HUATAI PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are several problems in the removal method of this tiny sticky matter: the one, tiny sticky thing, comprise the tiny sticky thing that particle diameter is less than 10um, dissolve in water or exist in the tiny sticky thing in water with colloidal state very easily. It is difficult to remove by flotation, and it is also very easy to accumulate, deposit, and aggregate in the recycled white water system to form larger sticky particles, which will continue to affect the system; the second is the sticky that is taken away with the paper It is also easy to form dust spots on the surface of the paper and affect the product quality; third, the treatment cost of using biological enzymes is relatively high, which affects the production cost

Method used

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  • Process for removing stickies in waste paper pulping process
  • Process for removing stickies in waste paper pulping process
  • Process for removing stickies in waste paper pulping process

Examples

Experimental program
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Embodiment 1

[0024] A process for removing stickies in waste paper pulping process, the specific process is as follows:

[0025] Pre-treatment process: the waste paper enters the drum to disintegrate, passes through the coarse screen, enters the unloading tower, and then enters the heat dispersion after passing through the flotation tank; at the same time, the pH value is controlled at 7.5-8.5;

[0026] Heat Dispersion:

[0027] The thermal dispersion temperature is 85°C, the power is 2000-2200KW; the passing rate of the slurry during thermal dispersion is 0.6 tons / min;

[0028] Cationic modified calcium carbonate is dispersed into a suspension with a solid content of 40% in warm water at 40°C;

[0029] Add the prepared cation-modified calcium carbonate suspension in the proportion of 15% of the absolute dry pulp to the forward slurry pump of the second-stage flotation,

[0030] The air intake of the flotation tank is controlled at 15m 3 / s, the overflow liquid level is 24%, and after 0...

Embodiment 2

[0036] A process for removing stickies in waste paper pulping process, the specific process is as follows:

[0037] Pre-treatment process: the waste paper enters the drum to disintegrate, passes through the coarse screen, enters the unloading tower, and then enters the heat dispersion after passing through the flotation tank; at the same time, the pH value is controlled at 7.5-8.5;

[0038] Heat Dispersion:

[0039] The thermal dispersion temperature is 82-86°C, the power is 1800-2000KW; the passing rate of the slurry during thermal dispersion is 0.7 tons / min;

[0040] Cationic modified calcium carbonate is dispersed into a suspension with a solid content of 40% in warm water at 45-50°C;

[0041] Add the prepared cation-modified calcium carbonate suspension to the slurry pump in the second-stage flotation at a ratio of 10% of the dry pulp;

[0042] The air intake of the flotation tank is controlled at 16m 3 / s, the overflow level is 20%, and after 0.5-1 hour of circular flo...

Embodiment 3

[0047] A process for removing stickies in waste paper pulping process, the specific process is as follows:

[0048] Pre-treatment process: the waste paper enters the drum to disintegrate, passes through the coarse screen, enters the unloading tower, and then enters the heat dispersion after passing through the flotation tank; at the same time, the pH value is controlled at 7.5-8.5;

[0049] Heat Dispersion:

[0050]The thermal dispersion temperature is 85-88°C, the power is 1800-2100KW; the passing rate of the slurry during thermal dispersion is 0.8 tons / min;

[0051] Cationic modified attapulgite is dispersed into a suspension with a solid content of 20% in warm water at 45-50°C;

[0052] Add the prepared cation-modified attapulgite suspension to the slurry pump for the second-stage flotation at a rate of 5% of the dry slurry;

[0053] The air intake of the flotation tank is controlled at 13m 3 / s, the overflow liquid level is 22%, and after 0.5-1 hour of circular flotatio...

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PUM

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Abstract

The invention relates to the fields of pulping and papermaking, and concretely relates to a process for removing stickies in a waste paper pulping process. According to the process, inorganic mineral matters such as cation modified talc powder, bentonite, attapulgite soil and calcium carbonate are added after heat dispersion and before secondary floatation in a waste paper pulping workshop section, cations of the inorganic mineral matters are used to adsorb the micro-fine stickies with negative charges, relatively large particle aggregate of the stickies is formed, a particle size requirement of floatation is achieved, the aggregate of the stickies is brought out from a liquid surface by utilizing floatation bubbles, the content of the stickeis in slurry is reduced, and the obstacle caused by the stickies in a papermaking workshop section is solved fundamentally.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a technology for removing stickies during the waste paper pulping process. Background technique [0002] Utilizing recycled waste paper is an economical and environmentally friendly means of pulping and papermaking, which not only saves wood resources, but also reduces the discharge of pulping sewage and energy consumption. However, one of the main obstacles in waste paper pulping is the problem of stickies. The stickiness of the stickies will stick to the felt, forming wire, dry wire, etc. during the papermaking process, causing obstacles to the operation of the paper machine. At present, the large stickies are mainly physically removed by screening equipment, and the fine stickies are taken away with the air bubbles during the flotation process or added with biological enzymes to reduce their viscosity, and then taken out of the system along with the paper sheets during the papermaki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02D21B1/32D21C9/00
CPCD21B1/32D21C5/02D21C9/00Y02W30/64
Inventor 刘燕韶张凤山李晓亮魏文光马厚悦魏国华郭启程
Owner SHANDONG HUATAI PAPER
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