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A method for extracting high-concentration black printing waste liquid pollutants and preparing a decolorizing agent

A high-concentration, decolorizing agent technology, used in the printing and dyeing industry, can solve the problems of secondary pollution, difficult dehydration treatment, and inability to realize resource utilization, and achieve the effect of reducing infrastructure investment, eliminating secondary pollution, and realizing resource utilization.

Active Publication Date: 2020-01-17
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high concentration of pollutants in the waste liquid, the solid content of the formed sludge is as high as 5-10%, and the sludge is highly hydrophilic and difficult to dewater, and the moisture content of the mud cake is still as high as 80%.
The mud cake formed by mechanical pressure filtration or centrifugal dehydration is usually landfilled as solid waste, which is likely to cause secondary pollution and cannot be used as a resource

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 92% sulfuric acid to the high-concentration black water-based ink printing waste liquid, stir for 15 minutes to make the pollutants condense; add 6.1g / L calcium mineral powder and 18.3g / L pumice to the sludge according to the solid content of the sludge After stirring evenly, heat the sludge to 75°C for dehydration while stirring to make the sludge form lumps; hot press the lumpy sludge until the moisture content is lower than 50% and then dry it naturally; heat the sludge to 550°C without air 1h; cool the sludge below 50°C and break it into granules, evenly spray a wetting agent solution with a mass concentration of 0.1% and mix evenly to prepare a cationic dye wastewater decolorizer; add the sludge granules at 5g / L wastewater Continuously added to the red cationic dye dyeing wastewater, stirred for 60 minutes to decolorize the wastewater, filtered to remove sludge particles, and the wastewater was discharged. The decolorization rate of red cationic dye dyed wastewa...

Embodiment 2

[0017] Add 92% sulfuric acid to the high-concentration black water-based ink printing waste liquid, stir for 10 minutes to make the pollutants condense; add 9g / L calcium mineral powder and 27g / L pumice to the sludge according to the solid content of the sludge, and stir After uniformity, heat the sludge to 80°C for dehydration while stirring to make the sludge form lumps; hot press the lumpy sludge until the moisture content is lower than 50% and then dry it naturally; heat the sludge to 500°C for 2 hours without air; Cool the sludge below 50°C and break it into granules, evenly spray a wetting agent solution with a mass concentration of 0.1% and mix evenly to prepare a cationic dye wastewater decolorizer; the sludge granules are continuously added at a dosage of 5g / L wastewater Add it to the wastewater dyed with mixed cationic dyes, stir for 60 minutes to decolorize the wastewater, filter to remove the sludge particles, and discharge the wastewater. The decolorization rate of ...

Embodiment 3

[0021] Add 40% hydrochloric acid to the high-concentration black water-based ink printing waste liquid, stir for 15 minutes to make the pollutants condense; add 6.5g / L calcium mineral powder and 20g / L pumice to the sludge according to the solid content of the sludge, After mixing evenly, heat the sludge to 75°C for dehydration while stirring to make the sludge form lumps; hot press the lumpy sludge until the water content is lower than 50% and then dry it naturally; heat the sludge to 550°C and keep it warm for 1.5 h; cool down the sludge below 50°C and break it into granules, evenly spray a wetting agent solution with a mass concentration of 0.1% and mix evenly to prepare a cationic dye wastewater decolorizer; add the sludge granules at 6g / L wastewater Continuously added to yellow cationic dyed wastewater, stirred for 60 minutes to decolorize wastewater, filtered to remove sludge particles, discharged wastewater, and the decolorization rate of red cationic dyed wastewater was ...

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Abstract

The invention discloses a method for extracting pollutants in high-concentration black printing waste liquid and preparing a decolorizing agent. The method comprises the following steps: adding acid into the high-concentration black water-based ink printing waste liquid, and stirring to form pasty sludge; adding calcium mineral powder and pumice stone particles into the sludge, adjusting the specific weight of the sludge, uniformly stirring, heating the sludge to 50-90 DEG C, and dewatering the sludge to form blocky sludge; carrying out heat squeezing on the blocky sludge and drying the blocky sludge; isolating the sludge from air, heating the sludge to 350-700 DEG C, and carrying out heat preservation for 1-4 hours; cooling the sludge, breaking the sludge into particles, spraying a wetting agent solution, and then uniformly mixing to prepare a suspension type cationic dye wastewater decolorizing agent; adding the sludge particles into cationic dye dyeing wastewater, aerating, stirring, carrying out air floatation or filtration to remove sludge particles, recycling the sludge particles, and discharging the wastewater; and recycling the recycled sludge particles after thermal regeneration of the recycled sludge particles. The method has the beneficial effects that the extraction and the resource utilization of pollutants in the high-concentration black water-based ink printing waste liquid are realized; and the color removal rate of the cationic dye dyeing wastewater reaches above 99.5%.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing industry, in particular to a method for extracting high-concentration black water-based ink printing waste liquid pollutants and preparing a cationic dye decolorizer. Background technique [0002] Ink is composed of pigments, binders, fillers, additives, etc., and can be divided into oil-based inks and water-based inks. Oil-based ink contains a large amount of organic solvents, which is seriously polluted and gradually eliminated. Water-based ink is mainly composed of water-soluble resin, pigment, alcohol, amine or ammonia and other additives and water, referred to as ink for short. Water-based ink is widely used in various fields because of its health, environmental protection and safety characteristics. At present, a large number of plastic packaging materials are increasingly using water-based inks in printing and printing. When changing colors, printing equipment and water-based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00C02F11/13C02F11/122
CPCC02F1/00C02F11/12C02F2101/308
Inventor 柳荣展张宾邹译慧石宝龙于梦楠
Owner QINGDAO UNIV