Method for recycling wax-containing waste paper

A waste paper and pulp technology, applied in the field of papermaking, can solve problems such as difficult removal of paraffin wax

Inactive Publication Date: 2015-04-22
FUJIAN YIYUAN WASTE UTILIZATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that it is difficult to remove the paraffin in the suspended state and the adsorbed state in the waxy waste paper

Method used

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Embodiment Construction

[0024] As a specific embodiment, a method for reusing waxy waste paper of the present invention includes a pulping process using waxy waste paper, and the pulping process includes the following steps in turn: pulping, high-concentration sand removal, Coarse screening, medium concentration desanding, fine sieving, flotation, low concentration desanding, concentration, thermal dispersion;

[0025] (1) Pulping: Put waxy waste paper and water in a pulper, add coagulant, control PH≈7, control pulping concentration to 5-10%, control temperature to 48.9-49.0°C, control pulping The time is 25 to 30 minutes, and the heat preservation is 0 to 30 minutes to obtain the rough paper pulp after disintegration. The coagulant condenses the wax in the rough paper pulp into wax coagulation, and the mass ratio of the coagulant is controlled so that the particle size of the wax coagulation is within Between 530~3210um;

[0026] The coagulant is mainly composed of polyglutamic acid or a radiation ...

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Abstract

The invention relates to a method for recycling wax-containing waste paper and particularly relates to a process for pulping by using wax-containing waste paper. The process comprises the following steps in sequence: repulping, desanding by using a high-concentration desanding device, screening coarsely, desanding by using a medium-concentration desanding device, screening finely, floating, desanding by using a low-concentration desanding device, concentrating and dispersing heat. Repluping is performed by disintegrating indirectly to ensure that the wax in waste paper can not be disintegrated seriously, by controlling the temperature of repulping to ensure that the wax can exist in the coarse pulp in an unbound state, and by adding a coagulating agent to ensure that the wax has larger aggregate particles than the untreated wax and is smooth in surfaces and low in density, more than 90% of wax can be removed easily by desanding using the high-concentration desanding device, screening coarsely, desanding using the medium-concentration desanding device and screening finely.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a pulping method for recycling waxy waste paper. Background technique [0002] Some old corrugated boxes are coated with a layer of paraffin or impregnated with paraffin. Generally, the old corrugated boxes coated with paraffin are sorted out through sorting, which not only requires labor, but also wastes some raw materials, and those old corrugated boxes impregnated with paraffin Corrugated boxes are usually difficult to identify, so there will always be some old waxy corrugated boxes entering the pulping process. If the wax content is less than 1%, then this waxy waste paper is still a qualified raw material. However, if the wax content is too high, during the recycling process of such waste paper, wax will become the largest source of wax pollution in waste paper recycling and paper mills. Because the presence of wax in the fiber will reduce the friction coefficient of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/14D21C5/02D21B1/32
CPCY02W30/64
Inventor 杨晓日商剑晖
Owner FUJIAN YIYUAN WASTE UTILIZATION
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