Sodium silicate low-temperature reaction pulping technology

A low-temperature reaction, sodium silicate technology, applied in the direction of pulping with acid salt/acid anhydride, textile and papermaking, raw material pretreatment, etc., can solve the problems of difficult recycling of waste liquid, environmental pollution, etc. The effect of good water filtration and high whiteness

Inactive Publication Date: 2017-05-31
刘长如
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The traditional wheat straw soda chemical pulping process includes high temperature and high pressure caustic soda cooking, black liquor extraction, washing, sieving, bleaching and other steps. This process requires a large amount of water and is not easy to recycle waste liquid, resulting in serious environmental pollution problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Take the pulping process as raw material with rice straw as an example:

[0031] (1) Grass cutting and dust removal: cut the straw into 2-5 cm long, and remove the impurities and soil of the straw;

[0032] (2) Disintegration: Use a pulverizer or crushing equipment to pulverize the dedusted straw twice to form a powder;

[0033] (3) Screening: Screen twice with a 60-mesh net to separate non-fibrous substances and obtain soft and smooth fiber bundle raw materials;

[0034] (4) Add water and sodium silicate as mixing material: transfer the fiber bundle raw material to the mixing screw, add sodium silicate and water, heat to 50°C, mix the material evenly for 30 minutes, the weight of the fiber bundle raw material, sodium silicate and water The ratio is 100:5:150;

[0035] (5) Squeezing and washing: Squeeze and wash the mixed raw materials, squeeze out the water inside the raw materials, add clean water to dissolve non-fibrous substances and pigments, and re...

Embodiment 2

[0038] Embodiment 2: take the pulping process of wheat straw as raw material as example:

[0039] (1) Grass cutting and dust removal: cut the wheat grass into 2-3 cm long, and remove the impurities and soil of the wheat grass;

[0040] (2) Disintegration: Use a pulverizer or crushing equipment to pulverize the dedusted straw 3 times and grind it into powder;

[0041] (3) Screening: Screen 3 times with a 60-mesh net to separate non-fibrous substances and obtain soft and smooth fiber bundle raw materials;

[0042] (4) Add water and sodium silicate as mixing material: transfer the fiber bundle raw material to the mixing screw, add sodium silicate and water, heat to 75°C, mix evenly for 50 minutes, the weight of the fiber bundle raw material, sodium silicate and water The ratio is 100:2:100;

[0043] (5) Squeezing and washing: Squeeze and wash the mixed raw materials, squeeze out the water inside the raw materials, add clean water to dissolve non-fibrous substances and pigments,...

Embodiment 3

[0046] Embodiment 3: Take the pulping process as raw material with cotton stalks as an example:

[0047] (1) Cut grass and remove dust: cut off the cotton stalks, and remove impurities and soil from the cotton stalks;

[0048] (2) Disintegration: Use a pulverizer or crushing equipment to pulverize the dust-removed cotton stalks 3 times and make them into powder;

[0049] (3) Screening: Screening with 80-mesh net for 3 times to separate non-fibrous substances and obtain soft and smooth fiber bundle raw materials;

[0050] (4) Add water and sodium silicate as mixing material: transfer the fiber bundle raw material to the mixing screw, add sodium silicate and water, heat to 90°C, mix the material evenly for 80 minutes, the weight of the fiber bundle raw material, sodium silicate and water The ratio is 100:10:200;

[0051] (5) Squeezing and washing: Squeeze and wash the mixed raw materials, squeeze out the water inside the raw materials, add clean water to dissolve non-fibrous s...

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PUM

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Abstract

The invention relates to a pulping technology and particularly relates to a sodium silicate low-temperature reaction pulping technology. The pulping technology mainly comprises the following steps: (1) cutting and dedusting the pulping raw material; (2) breaking; (3) screening; (4) adding water and sodium silicate and mixing; (5) squeezing water and washing; (6) pulp grinding; and (7) bleaching. In the technology provided by the invention, the pulping cost is low, and the equipment investment is small; on the premise of no pollution, fiber in the pulping raw material is separated out at low cost; the added sodium silicate replaces sodium hydroxide in traditional technology, the preparation technology is simpler, the pulping water is not discharged, the white pulp yield exceeds 60%, the pulp whiteness is high, the drainability is good, and the tensile strength is high.

Description

[0001] (1) Technical field [0002] The invention relates to a pulping process, in particular to a sodium silicate low-temperature reaction pulping process. [0003] (2) Background technology [0004] The shortage of fiber raw materials, high energy consumption and serious environmental pollution are the three major problems faced by my country's paper industry, and will restrict the benign and healthy development of the paper industry to a certain extent in a long period of time in the future. With the rapid development of my country's society and national economy, the demand for paper will continue to grow rapidly, and there is still huge room for development in my country's paper industry. [0005] The fibers used by large domestic paper-making enterprises mainly come from foreign wood pulp and waste paper, while the waste paper purchased in China is basically divided by some small and medium-sized paper-making enterprises. Our country has a large population and a vast terr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C3/04D21B1/06D21B1/02
CPCD21C5/00D21B1/02D21B1/06D21C3/04
Inventor 刘长如
Owner 刘长如
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