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Acid separated filtrate treating method for paper-making black liquor

A treatment method and technology for papermaking black liquor, applied in papermaking, textiles and papermaking, fiber raw material treatment, etc., can solve problems such as pollution, large amount of waste water, and reduced use efficiency, and achieve obvious economic benefits, prolong service life, and shorten the working cycle prolonged effect

Inactive Publication Date: 2005-03-02
SHANDONG TRALIN PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the large amount of wastewater produced by papermaking and pulping, the pollution is serious. After treatment, there are still many impurities. Although it can meet the environmental protection standards and be discharged into nature, there are still various pollutions. Even if it is reused, there are still many restrictions.
Using RO membrane treatment, the purification effect is ideal, but the use efficiency of RO membrane itself is reduced due to the accumulation of dirt on the surface of the membrane, and it needs to be continuously regenerated before it can continue to be used.

Method used

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  • Acid separated filtrate treating method for paper-making black liquor

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] Add Saccharomyces cerevisiae AS 2.23 to the filtrate obtained from the black liquor of straw pulp papermaking through acid analysis, keep it at 33°C for 10 days, and use RO membrane elements (FR11-8040, Huitong Yuanquan Company) to remove 65% of the filtrate. Moisture, NaOH is added in the concentrated solution obtained, and the pH value is adjusted to 6.5, and then it is dried in a pressure-type spray dryer. The moisture content of the dried product is 8.5%, and quartz sand is added according to 10% of the weight of the dried product. The modulus of the mixture is controlled at 2.5, and after being mixed evenly, it is calcined in a calciner to obtain a solid water glass product, which is colorless transparent glass particles.

Embodiment 2

[0024] Add Saccharomyces cerevisiae AS 2.23 to the filtrate obtained by acid analysis of the black liquor of straw pulp papermaking, and keep it at 38°C for 3 days, and use RO membrane element (FR21, Huitong Yuanquan Company) to remove 70% of the water in the filtrate. Add lime to the obtained concentrated solution to adjust the pH value to 7.0, then heat and dry it, the moisture content of the obtained dried product is 10%, add quartz sand according to 60% of the weight of the dried product, and control the modulus of the mixture at 3.4 , after mixing evenly, enter the calciner for calcination to obtain a solid water glass product, the water glass is light-colored transparent vitreous particles.

Embodiment 3

[0026] Add Saccharomyces cerevisiae AS 2.23 to the filtrate obtained by acid analysis of the black liquor of straw pulp papermaking, keep it at 35°C for 7 days, and use RO membrane element (FR21, Huitong Yuanquan Company) to remove 60% of the water in the filtrate. Add NaOH to the obtained concentrated solution to adjust the pH value to 7.0, then heat and dry it, and when the moisture content of the obtained dry product is 10%, add quartz sand according to 40% of the weight of the dry product to control the modulus of the mixture At 3.0, after mixing evenly, enter the calciner for calcination to obtain a solid water glass product, which is a colorless transparent vitreous particle.

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Abstract

The present invention disclose treating process of acid separated filtrate from papermaking black liquor, and belongs to the field of water treatment. The treating process of the present invention includes microbial treatment of the filtrate, treating with R0 film to eliminate 60-70 % of the water and to obtain concentrated liquid, adding alkali to regulate pH to 6.5-7.0, drying to water content of 8-10 %, adding quartzite with the weight ratio between dried material and quartzite being 0.1-1 and the mixture modulus being controlled in 2.5-3.4, and calcining the mixture in calcining furnace to prepare water glass. The present invention produces water glass while treating acid separated filtrate.

Description

Technical field: [0001] The invention relates to a treatment method for acid precipitation filtrate of papermaking black liquor, belonging to the field of water treatment. Background technique: [0002] Acid analysis filtrate is the product of pulping black liquor treated by acid analysis lignin process. Although 80%-90% of organic pollution load has been removed, the filtrate still has a certain pollution load and cannot be discharged directly. Some people have conducted research on biochemical treatment of it, but due to the high operating cost and complicated treatment process, it cannot be put into production operation, and a large amount of inorganic chemical raw materials are lost with water, which is not only a waste, but also a pollution. [0003] Acid analysis filtrate belongs to high organic concentration, high salinity acid wastewater, its solid content is 8-10%, direct drying, the cost is too high, if the water in the filtrate is removed before further treatment,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/00
Inventor 李洪法曹光春杨吉慧贾明昊孙冰娜
Owner SHANDONG TRALIN PAPER
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