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Pan grinder bleaching process of italian poplar APMP pulp

A pulping and process technology, applied in chemical/chemomechanical pulping and other directions, can solve the problems of insufficient understanding of characteristics, failure of production, quality and consumption to meet process requirements, restricting the use of chemical and mechanical pulping, etc., to achieve good whiteness, reduce Pulp pollution load, good economic benefits

Inactive Publication Date: 2004-04-28
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this production line is the first Italian poplar APMP pulping production line in China, there is no experience to learn from, and the characteristics of Italian poplar raw materials abundant in Dongting Lake area are not well understood. Seriously restrict the use of chemical mechanical pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: 1000kg of absolutely dry wood chips that meet the quality requirements are washed in hot water by a wood chip washing machine to remove silt, iron and some wood chips, and then enter the pre-steaming bin and add low-pressure steam for pre-steaming, so that the temperature of the wood chips in the bin reaches 90-100°C, the pre-steamed wood chips are extruded in a wood chip extruder with a compression ratio of 4:1. The extruded wood chips enter the prepreg, where the mixed chemical solution and H are added 2 o 2 . Mixed liquid: NaOH50kg, NaOH 2 SiO 3 30kg, MgSO 4 ·7H 2 O4kg, H 2 o 2 30kg. The wood chips absorb the liquid in the prepreg and enter the reaction chamber. The wood chips out of the reaction chamber pass through the plug screw to extrude part of the residual liquid and then enter the steaming tube. The wood chips in the steaming tube pass through the single screw discharger to the pressure conveying screw. The bleaching agent is added at the ...

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PUM

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Abstract

The present invention discloses an optimized disc-grinding and bleaching process of Italian poplar pulp, and is mainly characterized by that in first stage of disc grinding adding bleaching agent to make disc grinding and bleaching to make pulp, and optimizing the processes of wood chips washing, presteaming, extruding, soaking, second-stage grinding, screening and bleaching so as to reduce the consumption of chemicals for making Italia poplar APMP pulp and raise its quality. Said invention uses 20-50% matched quantity of APMP pulp, and can make high-grade colored printing news-paper, offset printing book-magazine paper, double gummed paper and LWC (light weight coating) paper, etc.

Description

1. Technical field: [0001] The invention relates to an APMP pulping process of Italian poplar containing cellulose raw material, in particular to the bleaching of APMP pulp. 2. Background technology: [0002] Chemimechanical pulping is a very flexible pulping process, especially in that it can use different chemical pretreatment processes. At present, cold caustic presoaking process (CCS), alkaline sulfite pretreatment process (CTMP) and alkaline peroxide pretreatment process (APMP) are generally used. The APMP process is developed on the basis of the CTMP process. Its pulping feature is that pulping and bleaching are combined into one, and the bleaching process is completed while pulping; because no sulfite is used in the pulping process, the wastewater does not contain Sulfur compounds are relatively easy for environmental protection; the number of impregnation stages, NaOH, H 2 o 2 Dosage: The raw material has wide adaptability, and it is a fast-growing and promising c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/02
Inventor 张栋基刘正宏郭勇为谈忠李卫平文华平李望南陈金山刘丽图张勇
Owner YUEYANG FOREST & PAPER CO LTD
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