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Sulfate pulping method of broadleaf wood compressed wood chip

A kraft, hardwood technology, applied in the field of pulping and papermaking, can solve problems such as high cost and low efficiency, and achieve the effects of reducing transportation and storage space, easy stacking and stacking, and beneficial to pulping energy consumption

Inactive Publication Date: 2012-07-04
北京晨峰投资控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low natural packing density of wood chips, the transportation of wood chips has become an inefficient and high-cost process

Method used

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  • Sulfate pulping method of broadleaf wood compressed wood chip
  • Sulfate pulping method of broadleaf wood compressed wood chip
  • Sulfate pulping method of broadleaf wood compressed wood chip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The technical conditions for drying and compressing eucalyptus wood chips: take eucalyptus wood chips, dry them at 105°C until the moisture content is 15%, and then dry them at 300kg / cm 2 The eucalyptus wood chips were compressed into cuboid blocks of 15cm x 7.5cm x 6cm under a certain pressure.

[0022] Get compressed and uncompressed eucalyptus wood chips 2kg (dry) respectively and carry out kraft pulping under the following process conditions: total alkali 16% (calculated as NaOH), sulfidation degree 25%, maximum temperature 170 ℃, heat preservation 100min, heat up 120min, liquid ratio 1:4.5.

[0023] The two pulps were screened with a 0.25mm slotted sieve, and then beaten with a PFI beater with a beating concentration of 10% and a target beating degree of 44°SR.

[0024] Pulping and papermaking weight is 60g / m 2 , Pulp properties are tested in accordance with the paper industry standard method.

[0025] Table 1 shows the comparison of the pulping properties of co...

Embodiment 2

[0030] Under the premise of achieving the same pulping hardness, the pulping process parameters of compressed eucalyptus wood chips and uncompressed wood chips are shown in Table 2.

[0031] Table 2

[0032]

[0033] As can be seen from Table 2, when reaching the same slurry kMnO 4 Compared with uncompressed wood chips, the total alkali consumption of compressed eucalyptus wood chips was reduced by 0.6 percentage points, the maximum cooking temperature was lowered by 5°C, the heating time was prolonged by 5 minutes, and the cooking conditions were milder. The required time was reduced by 8.33%, indicating that pulping chemicals and energy consumption can be reduced by the present invention.

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Abstract

The invention discloses a sulfate pulping method of a broadleaf wood compressed wood chip, which relates to a drying and compressing method of broadleaf wood chips, and a sulfate pulping process of the compressed wood chips. The method solves the difficult problems that bulked broadleaf wood chips are small in volume weight, low in transmitting efficiency, large in storage space and the like, and provides a targeted sulfate pulping process scheme aiming at the broadleaf wood compressed wood chips. Compared with uncompressed wood chips, after being dried and compressed, the broadleaf wood chips reduces volume by 1 / 3-1 / 4 of natural accumulation, so as to greatly improve the transporting efficiency and reduce the transporting cost; under the same sulfate cooking process conditions, the method reduces the full pulp sieving rate by 20-50%; under the premise of achieving same full pulp hardness indexes, the method reduces chemicals cooking consumption by 2-5%, reduces the pulping cost, and reduces the pollution load of pulping waste liquid; and when under the same pulping degree, the method shortens 8-25% of pulping time and obviously reduces the pulping energy consumption.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, and relates to a method for compressing hardwood chips into cubes that are convenient for transportation and then kraft pulping, and relates to drying and compression methods for hardwood chips and kraft pulping of compressed wood chips craft. Background technique [0002] At present, except for a small part of the fiber raw materials required by domestic pulp and paper enterprises, which can be supplied by self-operated forest farms or purchased around the factory, most of them need to be obtained through domestic long-distance transportation or transnational or transoceanic transportation from Southeast Asia, Australia and other places. However, due to the low natural packing density of wood chips, the transportation of wood chips has become an inefficient and high-cost process. How to improve the efficiency of wood chip transportation and reduce the cost of raw material transportation i...

Claims

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Application Information

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IPC IPC(8): D21H11/04D21C3/02D21C1/10
Inventor 吴晨葛少章葛少朝田超曹春昱聂怡杨小博
Owner 北京晨峰投资控股有限公司
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