Pulp preparing method for increasing bagasse oxygen-alkali cooking effect

A bagasse and pulp technology, applied in pulp bleaching, textile and papermaking, raw material pretreatment, etc., can solve the problems of increasing the washing water of bagasse, and achieve the effect of improving the penetration capacity, improving the properties and improving the effect.

Inactive Publication Date: 2012-07-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can save water for stockpiling and spraying, the water for subsequent bagasse washing will increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 : the paper pulp preparation method that this improves oxygen-alkali cooking effect, its concrete operation is as follows:

[0026] (1) Collect the Eop section and P section bleaching and washing waste liquid produced in the traditional pulping process (mixed at a ratio of 2:1), filter with a 60-mesh filter, settle in the transition tank, and use the mixed waste liquid to treat the bagasse raw material pile. Spray treatment, spraying every 4 hours for 5 minutes, the amount of each spraying is based on the amount of leachate flowing out from the bottom of the bagasse heap; stop spraying when the leachate flows out from the bottom of the bagasse pile; discharge the bagasse after spraying and stockpiling for 8 days, mix it evenly, and transfer the bagasse to the washing machine for further processing 3 stages of countercurrent washing, the last stage uses clean water, the liquid after washing and dehydration is sent to the previous washing stage, and the bagasse ...

Embodiment 2

[0034] Example 2 : the paper pulp preparation method that this improves oxygen-alkali cooking effect, its concrete operation is as follows:

[0035] (1) Collect the Eop section bleaching and washing waste liquid produced in the traditional pulping process, filter it with an 80-mesh filter screen, settle in the transition tank, and spray the bagasse raw material pile with the Eop section clarified waste liquid, spraying every 24 hours After 10 minutes, stop spraying when leachate flows out from the bottom of the bagasse heap; discharge the bagasse after spraying and stockpiling for 12 days, mix evenly, squeeze and dehydrate the bagasse, and then send it to the cooking equipment.

[0036] Stockpiling results: the actual sewage discharge of percolation water after processing bagasse is reduced by 23%, and the amount of clean water used per ton of pulp can be reduced by 7 m 3 .

[0037] (2) After dehydration, the bagasse is cooked with cooking liquid, and the cooking liquid is ...

Embodiment 3

[0043] Embodiment 3: The paper pulp preparation method that this improves oxygen-alkali cooking effect, its concrete operation is as follows:

[0044] (1) Collect the P-stage bleaching and washing waste liquid produced in the traditional pulping process, filter it with a 70-mesh filter, settle in the transition tank, and spray the bagasse raw material pile with the P-stage clarified waste liquid, spraying every 48 hours After 20 minutes, stop spraying when leachate flows out from the bottom of the bagasse heap; after 25 days of spraying, the bagasse stored in the pile is discharged, mixed evenly, and the bagasse is sent to the washing machine for 2 stages of countercurrent washing. It is sent to the previous washing section, and the bagasse after washing and dehydration is sent to the cooking equipment;

[0045] Stockpiling results: the actual sewage discharge of percolation water after processing bagasse is reduced by 38%, and the amount of clean water used per ton of pulp ...

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Abstract

The invention discloses a pulp preparing method for increasing bagasse oxygen-alkali cooking effect, comprising the steps of replacing clear water with bleaching effluents of Eop section and P section of bagasse oxygen-alkali pulp, reusing in wet stockpiling process of bagasse, carrying out oxygen-alkali cooking on the bagasse, washing, selecting, screening and bleaching to finally obtain the pulp. Compared with the yield of pulp obtained through the oxygen-alkali cooking of the bagasse subjected to wet stockpiling and sprayed by using the clear water and the yield of pulp obtained through oxygen-alkali cooking of the bagasse not subjected to wet stockpiling, the pulp obtained by utilizing the method has the advantages that the yield is respectively increased by 1-3 percentage points and 2-6 percentage points and the whiteness of unbleached pulp is increased by 1-3% ISO and the viscosity is increased by 40-110mL/g under the circumstance that pulp kappa numbers are close; the pollution load of middle-stage effluents can be decreased by 20-40%; and the water consumption per ton of pulp is decreased by 5-18m<3>.

Description

technical field [0001] The invention relates to a paper pulp preparation method for improving the oxygen-alkali cooking effect of bagasse, which is a paper pulp preparation method which utilizes Eop section and P-stage bleaching waste liquid to spray wet-process stacked bagasse to improve the effect of bagasse oxygen-alkali cooking. Background technique [0002] The pulp and paper industry is facing problems such as resource shortage, high energy consumption, and serious environmental pollution. Although some measures are being taken in terms of energy conservation and emission reduction to improve this situation, the results are minimal, especially in terms of raw materials, which are increasingly dependent on for import. Therefore, rationally developing new raw materials or increasing the pulping yield under the existing technological conditions has become an urgent problem to be solved in the paper industry. Bagasse is a by-product of sugarcane sugar factories, but it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/02D21C5/00D21C9/16
Inventor 孙兵刘玉新陈克利
Owner KUNMING UNIV OF SCI & TECH
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