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Mitigation technique in use for producing bleached chemical pulp by using raw material of grass

A technology for chemical pulp and raw material pulp, applied in the field of dispersing technology, can solve the problems of low impurity removal rate, pollution, difficulty in recovery of alkali from cooking black liquor, etc.

Active Publication Date: 2007-12-26
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of this utility model is to solve the problem of low impurity removal rate and serious pollution in the traditional dry method of raw material preparation with wheat straw in the prior art, which brings a lot of adverse effects to the subsequent pulping and papermaking production, and also affects the cooking black liquor. Alkali recovery brings great difficulties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]The rice straw is cooked by the ammonium method. After cooking, the hardness of the rice straw pulp is 16 potassium permanganate value, which is equivalent to the kappa value of 24. The straw pulp is transported to the deflagging machine for deflaking. It is 20°SR. It can be seen by the naked eye that there are no rod-shaped fibers after the straw pulp has been decompressed, which shows that the effect of fiber bundle separation can be achieved through the decompression operation. The decompression degree of the straw pulp after decompression is 22° SR, relative to the rice straw pulp before deflaking, the temperature of the straw pulp after deflaking increases by about 5-10°C. The decomposed straw pulp is then pumped to the screw press machine for "concentrated" black liquor treatment, the obtained thick black liquor can be used for subsequent evaporation as fertilizer, and the concentration of the extruded pulp is changed from that before extrusion to 10% is brought up...

Embodiment 2

[0036] The wheat straw is cooked by the ammonium method. After cooking, the hardness of the wheat straw pulp is 18. The potassium permanganate value is equivalent to the kappa value of 29. The wheat straw pulp is pumped to the screw press for squeezing, and the extruded black The liquid is evaporated and used as fertilizer, and the concentration of the extruded pulp is increased from 8% before the extrusion to 19%. At this time, the pH value of the pulp is 8, and the concentration of the extruded black liquor is 11 ° Be (20 ° C), and the residual ammonium is 8g / L, transport the pulp obtained after pulping to the high-frequency deflaking machine for deflaking, and at the same time add alkali with a concentration of 36g / L to the deflaking equipment, the weight of the lye is the mass of the dry pulp 2%, the knocking degree of the wheat straw pulp before deflaking is 20°SR, it can be seen by the naked eye that after the deflaking operation, the wheat straw pulp has no rod-shaped f...

Embodiment 3

[0038] Cotton stalks are cooked by alkaline method. After cooking, the hardness of cotton stalk pulp is 20. The potassium permanganate value is equivalent to 34 kappa value. The concentration of the pulp is increased from 8% before squeezing to 20%. At this time, the pH value of the pulp is 8.5. The obtained pulp is added to the black liquor for jumping screen. Before the jumping screen, adjust the concentration of the pulp and dilute the concentration of the pulp to 3.0%, the skipping sieve loss is 0.2%, and then the pulp obtained after skipping the screen is transported to the deflaking machine for deflaking, and at the same time, add alkali with a concentration of 38g / L to the deflaking equipment, and the weight of the lye is the dry pulp mass 3%, the degree of knocking of the cotton stalk pulp before deflaking is 20°SR, and it can be seen by the naked eye that there are no rod-shaped fibers after the cotton stalk pulp that has undergone the deflaking operation, which shows ...

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Abstract

This invention relates to an easing technology for producing bleach chemical pulp with grasses including: 1, preparing bleach chemical pulp according to the current technology, 2, easing the material pulp to loosen fiber structure in terms of the current technology after steaming grasses materials and before bleaching the pulp so as to loosen leaf structure of the grass fibers, which forms a cubic net structure suitable for exposing lignin in the grasses since the specific surface area is increased.

Description

technical field [0001] The invention relates to a deflaking process, in particular to a deflaking process for producing bleached chemical pulp from grass raw materials. Background technique [0002] In the book "Pulping and Papermaking Technology" in my country, it is pointed out that the strength of paper is through physical methods such as dissolving and beating the plant fibers, so that the two ends of the plant fibers are bristled and the surface is fluffed to varying degrees, and at the same time the fiber surface Microfibrillation increases the external specific surface area of ​​fibers, which is conducive to promoting the formation of hydrogen bonds between fibers during paper forming and improving the strength of paper. [0003] The use of deflaking technology in wood pulping process has been a relatively common production method. In the article "Assembly Equipment" in June 2004, a paper entitled "Screw Extrusion Deflagging Machine in Alkaline Hydrogen Peroxide Pulpin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/02D21C9/00D21C9/08
Inventor 曹振雷李洪法宋明信陈松涛杨吉慧毕衍金宋建军
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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