Improved P-RC APMP (preconditioning-refining chemical alkaline peroxide mechanical pulp) new flow path

A process and wood chip technology, applied in the field of improved P-RC APMP pulping new process, can solve the problems of heavy washing load, anion waste retention, unstable operation of wet end, etc., to reduce washing load, reduce steam consumption, The effect of high solid content of waste liquid

Inactive Publication Date: 2012-07-11
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the bleaching waste liquid produced in the reaction chamber after the first stage of immersion and the bleaching tower for the second immersion enters the 3-6% low-concentration submergence tank, the concentration is diluted, resulting in an overload of the washing load of the multi-disc pulp washer, which is harmful to the environment. The washing of the slurry is not thorough, and a large amount of anionic garbage remains in

Method used

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  • Improved P-RC APMP (preconditioning-refining chemical alkaline peroxide mechanical pulp) new flow path
  • Improved P-RC APMP (preconditioning-refining chemical alkaline peroxide mechanical pulp) new flow path

Examples

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Embodiment 1

[0017] Embodiment one: the new flow process of the improved P-RC APMP process of the present invention is combined figure 1 described as follows:

[0018] 1. Washing of wood chips: Wash wood chips with a length of 15-20mm, a thickness of 3-5mm, and a width of less than 10mm to remove sediment;

[0019] 2. Dehydration, extrusion and tearing of wood chips: Use an oblique spiral dehydrator to make the dryness of wood chips reach 35-40%; use an extrusion tearing machine with a compression ratio of 1:4.0 to extrude the wood chips into wood filaments;

[0020] 3. One-stage impregnation: impregnate the extruded wood chips in an alkaline hydrogen peroxide solution containing 20-40% of the total amount of chelating agent (DTPA), magnesium sulfate, and sodium silicate, and enter the reaction chamber to react for 30-60 minutes;

[0021] 4. One-stage high-consistency refining: After the reaction chamber, the slurry is subjected to a high-consistency refining at a concentration of 35-40%...

Embodiment 2

[0028] Embodiment two: the new flow process of the improved P-RC APMP technique of the present invention is combined figure 2 described as follows:

[0029] 1. Washing of wood chips: Wash wood chips with a length of 15-20mm, a thickness of 3-5mm, and a width of less than 10mm to remove sediment;

[0030] 2. Dehydration, extrusion and tearing of wood chips: Use an oblique spiral dehydrator to make the dryness of wood chips reach 35-40%; use an extrusion tearing machine with a compression ratio of 1:4.0 to extrude the wood chips into wood filaments;

[0031] 3. One-stage impregnation: impregnate the extruded wood chips in an alkaline hydrogen peroxide solution containing 20-40% of the total amount of chelating agent (DTPA), magnesium sulfate, and sodium silicate, and enter the reaction chamber to react for 30-60 minutes;

[0032] 4. One-stage high-consistency refining: After the reaction chamber, the slurry is subjected to a high-consistency refining at a concentration of 35-...

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Abstract

The invention provides an improved P-RC APMP (preconditioning-refining chemical alkaline peroxide mechanical pulp) pulping new flow path, which is characterized in that three or four in-series double helix press masters are added behind a conventional P-RC APMP flow path bleaching tower to extract a bleaching waste liquid, the gross extraction efficiency of the waste liquid is 80-95%, the improved P-RC APMP pulping new flow path is small in water consumption when the waste liquid is extracted, the extracted waste liquid is high in solid content, within the range of 4.0-8.0%, and the extracted waste liquid is processed by means of alkali recovery, so that the steam use level when the waste liquid is concentrated by means of alkali recovery can be reduced, the washing load of the pulp at a follow-up washing workshop section can be reduced, and the negative influence of anionic trash in the pulp to a wet part of a paper section paper machine can be further reduced simultaneously.

Description

1. Technical field: [0001] The invention relates to a new improved P-RC APMP pulping process. 2. Background technology: [0002] P-RC APMP is a classic pulping process in chemical mechanical pulp. The P-RC APMP pulping process is as follows: wood chips with a length of 15-20 mm, a thickness of 3-5 mm, and a width of less than 10 mm are washed with water to remove sediment; The screw dehydrator makes the dryness of the wood chips reach 30-40%; the wood chips are extruded into wood filaments by an extrusion tearing machine with a compression ratio of 1:4.0; the extruded wood chips are impregnated with chelating agent (DTPA), sulfuric acid Magnesium, sodium silicate, and alkaline hydrogen peroxide solution accounting for 20-40% of the total consumption, enter the reaction chamber for 30-60 minutes of reaction; after the reaction, the slurry is subjected to a high-concentration refining at a concentration of 35-40%; Then enter the high-concentration mixer and mix with alkaline ...

Claims

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Application Information

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IPC IPC(8): D21B1/02D21B1/34D21C3/02D21D1/20D21C9/16D21C9/18D21D5/02D21C9/02
Inventor 周小凡徐家祥马金霞
Owner NANJING FORESTRY UNIV
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