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Flocculation treatment method for waste liquid of gravure wiping plate of centrifuge

A waste liquid treatment and waste liquid technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of complex synthesis process of cationic organic flocculants, insufficient active functional groups, small molecular weight of polycondensate, etc. Fast speed and the effect of reducing moisture content

Active Publication Date: 2014-04-02
NANCHANG BANKNOTE PRINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Generally, the synthesis process of cationic organic flocculants is complicated and the product price is high
A large number of documents (such as Liu Zhiling's "Development of High Efficiency Flocculant and Application in Wastewater Treatment" in 2000, Xu Qingyan's "Application of Dicyandiamide-Formaldehyde Decolorizer in Fuel Wastewater" in 2008, Qian Ling's "Modified Dicyandiamide-Formaldehyde Synthesis and application of flocculants" 2008) reported that the initial condensation of dicyandiamide and formaldehyde has a certain decolorization and flocculation effect on colored waste liquid, but the flocs formed are small and difficult to clarify, which is due to the small molecular weight of the polycondensate and the reason for the lack of active functional groups

Method used

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  • Flocculation treatment method for waste liquid of gravure wiping plate of centrifuge
  • Flocculation treatment method for waste liquid of gravure wiping plate of centrifuge
  • Flocculation treatment method for waste liquid of gravure wiping plate of centrifuge

Examples

Experimental program
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Effect test

Embodiment 1

[0020] 1. Synthesis of cationic organic flocculants

[0021] 1) Synthesis of 1# flocculant—add 10 g of dicyandiamide, 5 g of aluminum chloride, 5 g of carbonamide, and ethylenediaminetetraacetic acid (EDTA) to 20 ml of formaldehyde solution with a mass fraction of 36%. ) 2g, stir evenly, then slowly add 20 ml of concentrated sulfuric acid while stirring, stir the reactant evenly and place it on an electromagnetic stirrer with heating function to heat to 60-70°C, stir at constant temperature for 2 hours, then cool to room temperature .

[0022] 2. Use of flocculant

[0023] 1) Pretreatment of plate wiping waste liquid

[0024] Heat the plate wiping waste liquid to 35-45°C, stir well, add sulfuric acid or other acids, adjust the pH of the plate wiping waste liquid to 7.5-9.5; add anhydrous calcium chloride after stirring evenly, the amount of anhydrous calcium chloride It is 0.1-0.5% (mass ratio) of the plate wiping waste liquid; the waste liquid is stirred at a constant spee...

Embodiment 2

[0028] 1. Synthesis of cationic organic flocculants

[0029] 1) Synthesis of 2# flocculant—add 10 g of dicyandiamide, 5 g of aluminum chloride, 5 g of carbonamide, and ethylenediaminetetraacetic acid (EDTA) to 55 ml of formaldehyde solution with a mass fraction of 36%. ) 2g, stir evenly, then slowly add 50 ml of hydrochloric acid with a mass fraction of 36% while stirring, stir the reactant evenly, heat to 60-70°C on an electromagnetic stirrer with heating function, and stir at constant temperature for 2 hours, Allow to cool to room temperature.

[0030] 2. Use of flocculant

[0031] The amount of 2# flocculant added is 0.15-0.5% (mass ratio) of the plate wiping waste liquid, which is diluted 10 times with tap water before use. When the flocculant is evenly added to the waste liquid, stirring should be continued, so that the flocculant can be mixed quickly and fully, and the flocculation reaction can be completed after stirring evenly.

[0032] The pretreatment of plate wip...

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Abstract

The invention provides a flocculating agent for treating waste liquid of a gravure wiping plate and an application method of the flocculating agent. By mainly utilizing a positive ion organic flocculating agent as a main additive and anhydrous calcium chloride as an auxiliary additive, the flocculating agent is added into the waste liquid of a gravure wiping plate at a specific condition for coagulation. The method can realize quick coagulation and sedimentation of components such as a surface active agent, mineral oil, fillers, a connecting material, dye, wax, a drying agent and the like in the waste liquid of a banknote printing gravure wiping plate, can increase the separation factors of the gravure waste liquid during treatment of the centrifuge, effectively reduces moisture content of a solid substance, increases the quality of the drained water, reduces the treatment volume of solid wastes and reduces the consumption of the flocculating agent, thereby fulfilling the aims of increasing the treatment efficiency of the waste liquid of the gravure wiping plate and reducing environmental pollution.

Description

technical field [0001] The invention relates to a flocculation treatment method for plate wiping waste liquid, in particular to a flocculation treatment method for centrifuge gravure printing waste liquid. Background technique [0002] After each inking of the gravure plate used in the banknote printing process, the excess ink on the non-graphic part of the printing plate needs to be thoroughly cleaned to ensure the quality of banknote printing. The cleaning solution for cleaning the engraved gravure is called plate wiping solution, which is mainly composed of sodium hydroxide, water, and ancient oil in a certain proportion. The ink used in the banknote printing process is mainly composed of complex components such as surfactants, fillers, binders, pigments, paraffin, desiccant, etc. After the engraved gravure is cleaned after ink, the mineral oil and ink are emulsified in the wiping solution , mixed into a suspension with complex components, forming gravure wiping plate wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/56C08G12/16
Inventor 陈雄伟曹建华刘刚崽王海江万吉平陈卉斌陈婕甘岚
Owner NANCHANG BANKNOTE PRINTING
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