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Method for pulping mixed broad-leaved woods

A technology for hardwood and pulping, which is applied in the directions of pulping with inorganic alkali, pulp bleaching, post-processing of cellulose pulp, etc., can solve the problems of difficult selection of process technology, many kinds of raw materials, and large differences in characteristics, so as to reduce environmental pollution. , reduce energy consumption, the effect of simple steps

Active Publication Date: 2014-08-13
YUNNAN YUNJING FORESTRY & PULP MILL
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Problems solved by technology

[0003] The present invention aims to solve the problems of the existing broad-leaf wood pulping method that there are many types of raw materials, large differences in characteristics, difficult process technology selection, backward domestic production process technology, dusty products, unstable quality, etc., and provide a reasonable step. The pulping method of mixed hardwood is simple and convenient, not only has high utilization rate of hardwood, can reduce energy consumption, but also can reduce environmental pollution, improve product quality and high pulping efficiency

Method used

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  • Method for pulping mixed broad-leaved woods

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Embodiment Construction

[0024] The method for mixing hardwood pulp of the present invention comprises the following steps:

[0025] S010, peeling

[0026] The broad leaves after harvesting are peeled in different ways according to different diameters and sizes;

[0027] S020, shavings

[0028] Chipping the hardwood that meets the requirements after peeling in the above step S010 with a chipper to obtain qualified wood chips;

[0029] S030. Cooking

[0030] Feed the qualified wood chips chipped in the above step S020 into the cooking pot, cook at a cooking temperature of 170°C to 175°C, use an alkali amount of 25% to 27%, H-factor 1500 to 2000, and DF1. 260 minutes;

[0031] S040. Removal of festivals

[0032] That is to say, the slurry cooked in the above step S030 is subjected to knot removal treatment at a feed concentration of 2% to 4%, a slurry concentration of 2% to 3.5%, a normal pressure difference of 0 to 40Kpa, and a working pressure of 150 to 500Kpa;

[0033] S050. Screening

[0034]...

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Abstract

The invention relates to a method for pulping mixed broad-leaved woods. The method comprises the following steps: (1) peeling cut mixed broad-leaved woods in different means according to different diameters; (2) chipping the broad-leaved woods, which are peeled in the step (1) and meet the requirement, by a chipping machine; (3) cooking the qualified wood chips, which are obtained by chipping the woods in the step (2), for certain time; (4) removing knots of pulp which is obtained by cooking the chips in the step (3); (5) performing enclosed primary three-section screening on the pulp subjected to knot removal in the step (4); (6) washing the pulp screened in the step (5); (7) performing two-section oxygen removal on the pulp washed in the step (6); (8) performing D1-EOP-D2 three-section bleaching on the pulp subjected to oxygen removal in the step (7); (9) mixing qualified bleached sulfate which is obtained by bleaching in the step (8) with the broad-leaved wood pulp for performing coarse pulp processing. The method is reasonable in steps, and convenient to carry out; the utilization rate of the broad-leaved woods is high, the energy consumption and the environment pollution can be reduced, the product quality is improved and the pulping efficiency is high.

Description

technical field [0001] The invention relates to a wood pulping and papermaking method, in particular to a pulping method of mixed hardwood. Background technique [0002] Hardwood (excluding eucalyptus, the same below) is one of the good raw materials for pulping and papermaking, and it has a large distribution in Southwest my country, South China and other places. The hardwoods in southern Yunnan are mainly distributed in Jinggu, Zhenyuan, Ning'er and other places in Yunnan. Compared with the hardwood resources in South China and Southwest China, there are more types of hardwoods in southern Yunnan, and the characteristics of raw materials are quite different. There are few types of mixed hardwood pulp raw materials in domestic production, mainly batch cooking, chlorine or hypochlorite bleaching, and there is no oxygen delignification, the amount of chemicals is large, the energy consumption is high, the environment is polluted, and the technology is relatively backward, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/04D21C3/02D21C9/00D21C9/02D21C9/16D21B1/02D21B1/06
Inventor 马宁
Owner YUNNAN YUNJING FORESTRY & PULP MILL
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