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Method of mechanical pulp making by using cotton pole

A technology of mechanical pulping and cotton stalks, applied in the field of paper pulping, can solve the problems of low utilization rate of cotton stalks, high chemical composition of waste liquid, low pulping rate of cotton stalks, etc., and achieve easy sewage treatment, waste liquid chemical The effect of low composition and process optimization

Inactive Publication Date: 2008-02-06
安明军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for mechanical pulping using cotton stalks, which solves the problems of low utilization rate of all cotton stalks, complicated process, low cotton stalk pulping rate and high chemical composition of waste liquid in the prior art. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The method of this embodiment is implemented according to the aforementioned steps, and the relevant parameters are controlled according to the following values:

[0052] Step A is material preparation, that is, the cotton stalks are chopped into 2cm segments by a mechanical device.

[0053] Step B is dedusting and splitting, which specifically includes

[0054] B1, a section of dust removal and filament separation,

[0055] B2, second-stage dust removal and filament separation.

[0056] Step C is cooking, and the vermicelli-shaped fiber slurry made in step B2 is dropped into a steaming ball, and the vermicelli-shaped fiber slurry is mixed with NaOH accounting for 1.5% of the total mass of the slurry, and the pressure is evenly increased and the temperature is raised. When the pressure reaches 0.7 MPa±0.01MPa, when the temperature reaches 165°C±2°C, the time to keep the pressure and temperature stable is 120 minutes, and it takes 7 hours for the whole process from seali...

Embodiment 2

[0064] The method of this embodiment is implemented according to the aforementioned steps, and relevant parameters are controlled according to the following values:

[0065] Step A is material preparation, that is, the cotton stalks are chopped into small sections of 3 cm by a mechanical device.

[0066] Step B is dedusting and splitting, which specifically includes

[0067] B1, a section of dust removal and filament separation,

[0068] B2, second-stage dust removal and filament separation.

[0069] Step C is cooking, put the slurry made in step B2 into the steaming ball, add 2.0% NaOH accounting for the total mass of the slurry in the slurry, uniformly increase the pressure and temperature, when the pressure reaches 0.8MPa ± 0.01MPa, the temperature reaches At 170°C±2°C, the time to keep the pressure and temperature stable is 90 minutes, and it takes 6 hours for the whole process from sealing the steaming ball to heating and pressurizing to completing the cooking.

[0070...

Embodiment 3

[0077] The method of this embodiment is implemented according to the aforementioned steps, and relevant parameters are controlled according to the following values:

[0078] Step A is material preparation, that is, the cotton stalks are chopped into 4cm segments by a mechanical device.

[0079] Step B is dedusting and splitting, which specifically includes

[0080] B1, a section of dust removal and filament separation,

[0081] B2, second-stage dust removal and filament separation.

[0082] Step C is cooking, put the slurry made in step B2 into a steaming ball, add 1.7% NaOH accounting for the total mass of the slurry in the slurry, and evenly increase the pressure and temperature. When the pressure reaches 0.75MPa ± 0.01MPa, the temperature When it reaches 168°C±2°C, the time to keep the pressure and temperature stable is 100 minutes, and it takes 6.5 hours for the entire process from the sealing of the steaming ball to the completion of heating and pressure.

[0083] Step...

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Abstract

The present invention discloses a method for mechanical pulping with a cotton stalk, and the method is realized by the following steps that the method includes material preparation, dust removal and wire division, cooking, spraying, high concentration grinding, cleaning, black liquid removal, intermediate concentration grinding, screening and condensation, wherein, the dust removal and the wire division also include a first dust removal and wire division and a second dust removal and wire division, which are used to remove sand dust, impurity and core in the stalk completely. In the steps of material preparation, dust removal and wire division of the present invention, sufficient pretreatment is done for the cotton stalk to make fiber of the cotton stalk is fully grinded and refined. In the cooking, less chemical agent is added, which facilitates sewage treatment. The method in the present invention is more applicable for pulping of the cotton stalk, which realizes material preparation of the total cotton stalk, high pulping rate of the cotton stalk, the paper quality is improved and chemical composition in the waste liquid is low which is easy for treatment. The technology is optimized, and the power consumption and the production cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of papermaking and pulping, and relates to a method for mechanically pulping by using cotton stalks. Background technique [0002] The demand for raw materials in the current papermaking industry is expanding day by day, many papermaking raw materials are in short supply, and the cost of raw materials has increased significantly. Cotton stalks have been paid more and more attention as a cheap new papermaking raw material. [0003] A Chinese patent application for a method for preparing finished paper from cotton stalk chemical pulp (patent application number 200510085007.9, application date 2006.01.11, publication number CN1718916) involves a method for making pulp using cotton stalks. Material preparation treatment, impregnation treatment, first-time cooking or second-time cooking, to obtain coarse pulp, washing pulp, and then bleaching to obtain cotton stalk chemical pulp, thus breaking the traditional pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/02D21B1/06D21C3/02D21C7/00D21C7/08D21D1/20D21C9/02D21D5/02D21C9/18
Inventor 安明军
Owner 安明军
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