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Process for screening bamboo wood dissolving pulp

A technology of dissolving pulp and process, applied in textile and papermaking, fiber raw material processing and other directions, can solve the problems of equipment wear, limited sand removal effect, and high content of heavy impurities such as sand particles, so as to improve recycling, improve screening capacity, and reduce The effect of less ground

Active Publication Date: 2011-08-17
CHONGQING LEE & MAN PAPER MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the material preparation process, the impurity content is still higher than that of wood chips. The traditional slurry screening method has limited sand removal effect, resulting in high content of heavy impurities such as sand particles in the subsequent sections, and serious equipment wear.

Method used

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  • Process for screening bamboo wood dissolving pulp
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Examples

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Comparison scheme
Effect test

Embodiment 1

[0050] A screening process for bamboo dissolving pulp, which comprises coarse screening process A and fine screening process B;

[0051] The coarse screening process A adopts a section of desander, a section of knot remover and a section of knot washing machine, and the specific steps are:

[0052] A1. Pump the slurry in the cooking spray pot to the knot remover;

[0053] A2. In the knuckle remover, the rough screen good pulp that passes through the sieve enters the next process, while the slurry that does not pass the sieve enters the knot washing machine;

[0054] A3. In the knot washing machine, the knots in the slurry are dried by the screw from the upper part of the washing machine and then discharged to the waste residue recovery room, and the good pulp obtained after the slurry is washed and separated by the knot washing machine is returned to the Knuckle remover, repeat step A2;

[0055] The fine screening process B adopts three-stage pressure screen, two-stage desan...

Embodiment 2

[0088] A screening process for bamboo dissolving pulp, which comprises coarse screening process A and fine screening process B;

[0089] The coarse screening process A adopts a section of desander, a section of knot remover and a section of knot washing machine, and the specific steps are:

[0090] A1. Pump the slurry in the cooking spray pot to the knot remover;

[0091] A2. In the knuckle remover, the rough screen good pulp that passes through the sieve enters the next process, while the slurry that does not pass the sieve enters the knot washing machine;

[0092] A3. In the knot washing machine, the knots in the slurry are dried by spiral drying from the upper part of the washing machine and then discharged to the waste residue recovery room, and the good pulp obtained after the slurry is washed and separated by the knot washing machine is returned to the Knuckle remover, repeat step A2;

[0093] The fine screening process B adopts three-stage pressure screen, two-stage d...

Embodiment 3

[0126] A screening process for bamboo dissolving pulp, which comprises coarse screening process A and fine screening process B;

[0127] The coarse screening process A adopts a section of desander, a section of knot remover and a section of knot washing machine, and the specific steps are:

[0128] A1. Pump the slurry in the cooking spray pot to the knot remover;

[0129] A2. In the knuckle remover, the rough screen good pulp that passes through the sieve enters the next process, while the slurry that does not pass the sieve enters the knot washing machine;

[0130] A3. In the knot washing machine, the knots in the slurry are dried by spiral drying from the upper part of the washing machine and then discharged to the waste residue recovery room, and the good pulp obtained after the slurry is washed and separated by the knot washing machine is returned to the Knuckle remover, repeat step A2;

[0131] The fine screening process B adopts three-stage pressure screen, two-stage d...

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Abstract

The invention belongs to the technical field of the preparation of dissolving pulp, in particular to a process for screening bamboo wood dissolving pulp. The process comprises a rough screening process A and a fine screening process B, wherein the rough screening process A is characterized by adopting a one-section desander, a one-section knotter and a one-section knot washer; the fine screening process B is characterized by adopting a three-section pressurized screen, a two-section desander and a one-section vibrating screen. In the process, the pulp entering density of a rough screening section is high, screening capability is improved, the one-section desander is added so as to reduce abrasion on the knotter by heavy impurities, such as sand grains, metal particles and the like, thereby prolonging the service life of the knotter; in the fine screening section, the three-section pressurized screen and the two-section desander are combined to screen in a sealing mode so as to furthest remove impurities, such as fiber bundles, sand and the like in the pulp, thereby improving screening efficiency, and meanwhile, prolonging the service life of the pressurized screen; and screening is operated under the condition of high density, the water consumption and the fiber loss of a system are lowered, and black liquor entering the step of boiling has high density, which is favourable for improving the recovery rate of black liquor.

Description

technical field [0001] The invention belongs to the technical field of preparation of dissolving pulp, in particular to a screening process for dissolving bamboo pulp. Background technique [0002] Dissolving pulp is widely used in textile viscose fiber, nitrocellulose, cellulose acetate and other cellulose derivative industries, and the market demand is gradually expanding. At present, the newly developed bamboo dissolving pulp has a broad market prospect and can fill the gap of dissolving pulp in my country. [0003] However, the existing bamboo dissolving pulp production equipment and technology are relatively backward, mainly using equipment such as jumping screen, CX screen, multi-stage conical desander, etc., with low screening efficiency, large water consumption, large fiber loss, and harsh working environment. Although the improved pressure screen is a closed screening equipment, the screening efficiency is not high, and the sand removal effect is not enough, result...

Claims

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Application Information

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IPC IPC(8): D21D5/00D21D5/02
Inventor 李文俊
Owner CHONGQING LEE & MAN PAPER MFG