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High-low pressure combined method for extracting black liquor

A combined extraction, high and low pressure technology, applied in the regeneration of pulping liquid, textile and papermaking, fiber raw material treatment, etc., to achieve the effect of overcoming silicon interference

Inactive Publication Date: 2006-03-29
冯长祯 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high-pressure extraction is difficult to extract the black liquor in the fiber cell lumen and intercellular space smoothly

Method used

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  • High-low pressure combined method for extracting black liquor

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Embodiment Construction

[0009] As shown in the figure, the hot water spraying on the horizontal vacuum pulp washer of the present invention is divided into six sections, and the black liquor produced by one section of hot water spray washing pulp enters the alkali distribution tank through the pipeline and mixes with the alkali liquor for cooking and alkali distribution , the mixed lye is mixed with wheat straw and pre-soaked, and then sent to the steaming ball and steamed together to form black pulp. The excess black liquor from alkali blending in the first stage can also be merged into the second stage for countercurrent washing, diffusion and thickening.

[0010] The second-stage black liquor produced by the second-stage hot water spray washing pulp enters the three-stage, four-stage, and five-stage hot water spray process through the pipeline and the nozzle in series, and is used for countercurrent washing, diffusion replacement, and step-by-step thickening of the entire stage. Generate five segm...

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Abstract

The method for extracting black liquor includes the following steps: after the black pulp is produced by digestion, making the black pulp be passed through blow tank, series-connecting two pulp-pressing machines, utilizing high-pressure to extract black liquor, making outlet pulp of pulp-pressing machine be passed through series-connected pulp chest, then series-connecting horzontal ban-type vacuum pulp-washing machine, using hot water to wash pulp, and utilizing low-pressure to extract black liquor.

Description

technical field [0001] The invention belongs to the technical field of papermaking black liquor treatment, and in particular relates to a method for extracting black liquor by combining high and low pressures in the process of extracting black liquor. Background technique [0002] my country lacks timber resources, and many paper mills use wheat straw as raw material to make pulp and paper. Compared with wood, wheat straw has the characteristics of fine fiber, low lignin content, low cellulose, and large ash content. Especially the high content of silicon dioxide causes the black liquor produced after cooking to have a high viscosity and is difficult to extract. Alkaline pulping will inevitably have a large amount of chemicals remaining in the cooking waste liquor after reacting with fiber raw materials, and this cooking waste liquor is black liquor. Black liquor extraction is the key to control the pollution of wheat straw pulp black liquor, and it is also an important li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/00
Inventor 冯长祯王性仁
Owner 冯长祯
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