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Zero residual base normal-pressure or low-pressure boiling high-concentration pulp preparing method by using base process

A low-pressure cooking and high-consistency technology, which is applied in the field of papermaking and pulping, can solve the problems of huge investment and high operating costs in alkali recovery technology, and achieve high washing and bleaching efficiency, reduce investment costs, and reduce the amount of black liquor and sewage. Effect

Inactive Publication Date: 2008-07-09
晏永祥
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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 solve the problems of huge investment and high operating costs in the existing alkali recovery technology, and to provide a new technology for pulping by alkaline cooking, which can make pulp with a higher concentration under normal or low pressure conditions, so that the pulping black liquor There is no residual alkali, which is convenient for black liquor treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In 2000kg of crushed and dedusted reeds, add 700L of alkali solution with a temperature of 80°C and a concentration of 5%, add the catalyst under stirring, and add it to the cooking pot for cooking after stirring evenly. The cooking pressure is 0.0-0.3Mpa, the cooking time is 6 hours, the slurry concentration is controlled at 20-45%, the pH value of the slurry is 6.5-7.5, the pH value of the black liquor is 6.5-7.5, and the mass dosage of the catalyst is 3%, wherein: Sodium sulfite 2.6%, magnesium hydroxide and sodium silicate 0.2% each. After cooking, the raw material is washed and pulped with a twin-screw kneading extrusion pulping machine (purchased by Hebei Tianzheng Twin-screw Pulping Equipment Co., Ltd.), and then finely ground with a double-disc refiner at a pulp concentration of 6%. , the beating degree of pulping is 38 degrees, and the high-strength corrugating base paper is blended with domestic waste paper pulp, and the proportion of reed pulp is 20% (mass ra...

Embodiment 2

[0033] In 2000kg of broken and dedusted cotton stalks, add 700L of alkali solution with a temperature of 70°C and a concentration of 4%, add the catalyst under stirring, and add it to the cooking pot for cooking after stirring evenly. The cooking pressure is 0.0-0.2Mpa, the cooking time is 10 hours, the slurry concentration is controlled at 20-45%, the pH value of the slurry is 6.5-7.5, the pH value of the black liquor is 6.5-7.5, and the mass dosage of the catalyst is 4%, of which anthracene Quinone 0.1%, sodium sulfite 3.5%, potassium hydroxide 0.3% and urea 0.1%. After cooking, the raw materials are washed and pulped with a twin-screw extrusion pulper, and then refined with a double-disk refiner at a pulp concentration of 6%. The pulping degree is 35 degrees, and it is blended with domestic waste paper pulp High-strength corrugated base paper, the proportion of cotton stalk pulp added is 30%, and the quality indicators of the finished paper all meet the standards of GB13023...

Embodiment 3

[0035] In 2000kg of broken and dedusted bamboo chips, adding temperature is 80 DEG C, concentration is 700L of alkali solution of 6%, add catalyst under stirring, add in cooking pot after stirring evenly and cook. The cooking pressure is 0.0-0.2Mpa, the cooking time is 15 hours, the slurry concentration is 20-45%, the pH value of the slurry is 6.5-7.5, the pH value of the black liquor is 6.5-7.5, and the mass dosage of the catalyst is 3%, of which: anthracene Quinone 0.15%, Sodium Sulfite 2.7% and Magnesium Hydroxide 0.15%. After cooking, the raw materials are washed and pulped with a twin-screw kneading extrusion pulper, and then finely ground with a double-disc refiner under the condition of a pulp concentration of 6%. The beating degree of pulping is 42 degrees. All the quality indicators of the finished paper meet the requirements of QB / T3516-1999 standard A-grade paper.

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Abstract

The invention relates to a method for boiling high concentration pulping in normal pressure or low pressure by an alkaline method with zero residual alkaline, and the method comprises adding accelerating agent in the boiling process and utilizing a double screw to rub and squeeze a pulper, leading pulp making and boiling process with an alkaline method to go on in normal pressure or low pressure, and leaving no residual alkaline in black liquor, leading pulp to always keep a higher density in the pulping process of boiling, washing and bleaching, and the pulp which is prepared can meets the requirement of paper making. Accelerating agent chooses one or a plurality of magnesium hydrate, potassium hydrate, sodium metasilicate, sodium sulfide, sodium sulfite, ammonium sulfite and carbamide. Special-purpose pulping boiling equipment and high-pressure boilers are not needed by pulping paper mills through utilizing the invention, in the process of pulping, pulp always keeps higher density, and black liquid has high density, little numbers and low energy consumption, alkaline recovery project with great investment is not needed to be built, and the invention enables black liquid to prepare fertilizer or other chemical products with high quality, and the invention is suitable for popularizing and applying.

Description

technical field [0001] The invention belongs to the technical field of papermaking and pulping, and in particular relates to a new technology for pulping black liquor with high concentration under normal pressure or low pressure without residual alkali. Background technique [0002] After alkaline pulping, a large amount of fiber and non-fiber raw materials and most of the alkaline substances are dissolved in the cooking liquid to become black liquor, which is the largest pollution source in the paper industry, and the pollution load can reach 90% of the total pollution load. At present, large-scale papermaking enterprises at home and abroad mostly use traditional alkali recovery technology to treat black liquor. This technology is more effective in reducing environmental pollution caused by the paper industry. However, the one-time investment of traditional alkali recovery technology is huge, and it generally takes The investment is tens of millions of yuan, and the daily op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C7/00D21H11/12D21H17/64D21H17/66D21H17/07D21H17/05
CPCY02P70/10
Inventor 晏永祥
Owner 晏永祥
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