Method for reducing generation of AOX in bleaching process of bagasse pulp with chlorine dioxide by optimizing alkali extraction section

A technology of chlorine dioxide and bagasse pulp, applied in the direction of pulp bleaching, etc., can solve the problems of increasing environmental threats and large discharge of pulp and paper wastewater, and achieve the effect of reducing AOX content

Inactive Publication Date: 2015-06-03
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although ECF bleaching can significantly reduce the content of adsorbable organochlorine halogens (AOX) in wastewater, due to the large amount of pulping and p...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for optimizing the alkali extraction section to reduce the generation of AOX in the chlorine dioxide bleaching process of bagasse pulp, the operation steps are as follows:

[0018] 1. Chlorine dioxide bleaching:

[0019] Take 20g of absolutely dry bagasse pulp, prepare a bleaching environment where the mass concentration of bagasse pulp is 10%, chlorine dioxide D 0 E. p D. 1 The technological conditions of the three-stage bleaching are as follows: D 0 The amount of chlorine dioxide in the first stage is 1.6% of the quality of the absolute dry bagasse pulp, the bleaching temperature is 60°C, and the bleaching reaction time is 60min; D 0 No pulp washing at the end of the section, directly enter E p part. E. p The amount of sodium sulfide added in the stage is 0.25% of the mass of the absolute dry bagasse pulp, the amount of sodium hydroxide is 2.5% of the mass of the absolute dry bagasse pulp, the amount of hydrogen peroxide is 1% of the mass of the absolut...

Embodiment 2

[0025] A method for optimizing the alkali extraction section to reduce the generation of AOX in the chlorine dioxide bleaching process of bagasse pulp, the operation steps are as follows:

[0026] 1. Chlorine dioxide bleaching:

[0027] Take 20g of absolutely dry bagasse pulp, prepare a bleaching environment where the mass concentration of bagasse pulp is 10%, chlorine dioxide D 0 E. p D. 1 The technological conditions of the three-stage bleaching are as follows: D 0 The amount of chlorine dioxide in the first stage is 1.6% of the quality of the absolute dry bagasse pulp, the bleaching temperature is 60°C, and the bleaching reaction time is 60min; D 0 No pulp washing at the end of the section, directly enter E p part. E. p The amount of sodium sulfide added in the stage is 0.50% of the mass of the absolute dry bagasse pulp, the amount of sodium hydroxide is 2.5% of the mass of the absolute dry bagasse pulp, the amount of hydrogen peroxide is 1% of the mass of the absolut...

Embodiment 3

[0032] A method for optimizing the alkali extraction section to reduce the generation of AOX in the chlorine dioxide bleaching process of bagasse pulp, the operation steps are as follows:

[0033] 1. Chlorine dioxide bleaching:

[0034] Take 20g of absolutely dry bagasse pulp, prepare a bleaching environment where the mass concentration of bagasse pulp is 10%, chlorine dioxide D 0 E. p D. 1 The technological conditions of the three-stage bleaching are as follows: D 0 The amount of chlorine dioxide in the first stage is 1.6% of the quality of the absolute dry bagasse pulp, the bleaching temperature is 60°C, and the bleaching reaction time is 60min; D 0 No pulp washing at the end of the section, directly enter E p part. E. p The amount of sodium sulfide added in the stage is 1.00% of the mass of the absolute dry bagasse pulp, the amount of sodium hydroxide is 2.5% of the mass of the absolute dry bagasse pulp, the amount of hydrogen peroxide is 1% of the mass of the absolute ...

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Abstract

The invention discloses a method for reducing generation of AOX in a bleaching process of bagasse pulp with chlorine dioxide by optimizing an alkali extraction section. According to the method, the bagasse pulp is taken as a raw material, elemental chlorine-free bleaching is adopted, chlorine dioxide is taken as a main bleaching agent, a D0EpD1 three-section bleaching process is used, an assistant, namely sodium sulfide, is added in the Ep section, the using amount of sodium sulfide is 0.25-1.00% of the mass of absolutely dry bagasse pulp, and the ISO whiteness of the pulp after bleaching and the content of AOX in bleaching wastewater are detected. Compared with the prior art, the ISO whiteness of the pulp after bleaching is slightly reduced, and meanwhile, the content of AOX in the bleaching wastewater is greatly reduced.

Description

technical field [0001] The invention relates to the field of clean pulping and papermaking, in particular to a method for optimizing the alkali extraction section to reduce the generation of AOX in the chlorine dioxide bleaching process of bagasse pulp. Background technique [0002] The organic pollutants in the pulping and papermaking process mainly come from the bleaching of the pulping system. In the traditional chlorination-alkali treatment-hypochlorite bleaching (CEH) process, a large number of harmful substances are produced by hypochlorite bleaching and chlorination reactions, resulting in serious wastewater pollution. The best way to solve this problem is to use low-polluting high-efficiency bleaching, namely elemental chlorine-free (ECF) bleaching or total chlorine-free (TCF) bleaching. Practice has proved that pulp and paper enterprises can achieve the unity of environmental, economic and social benefits by using chlorine dioxide-based ECF bleaching technology to ...

Claims

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Application Information

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IPC IPC(8): D21C9/14
CPCD21C9/144D21C9/1026D21C9/163
Inventor 姚双全覃程荣聂双喜詹磊宋雪萍
Owner GUANGXI UNIV
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