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Preparation method of special activated-carbon electrode block for capacitive deionizing equipment

A technology of capacitive deionization and activated carbon, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of poor electrode material strength and high cost of activated carbon fibers, and achieve low preparation costs, conductivity and specificity. Capacitive performance is excellent, and the effect of graphitization is realized

Active Publication Date: 2017-02-15
ZHEJIANG DOWAY ADVANCED TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the cost of activated carbon fiber is too high, and the strength of the electrode material is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Take 600g of coconut shell activated carbon, 200g of medium-temperature coal tar pitch, 20g of carbon fiber, 50g of expanded graphite powder, and 50g of conductive carbon black. The particle size of activated carbon is 6μm, and the specific surface area is 1550m 2 / g. The softening temperature of medium-temperature coal tar pitch is 80-86°C. The carbon fiber has a diameter of 5 μm and a length of 1.5 cm. The expanded graphite powder is 50 mesh, with a carbon content of 93%. The resistivity of the conductive carbon black was 1.2 Ω·m.

[0049] First add dry material granules other than coal tar pitch into the kneader for dry mixing at room temperature for 20 minutes, then add coal tar pitch to the kneader for wet mixing for 40 minutes at a temperature of 145°C;

[0050] The kneaded paste is subjected to the next molding process, and the molding process adopts the isostatic pressing process: the kneaded paste is cooled to 90°C, filled into a rubber mold, and the presse...

Embodiment 2

[0058] Get coconut shell activated carbon 600g, phenolic resin 150g, urotropine 12g, carbon fiber 20g, conductive carbon black 40g, expanded graphite 10g. The particle size of activated carbon is 5.4μm, and the specific surface area is 1840m 2 / g. The phenolic resin model is 2123. The carbon fibers have a diameter of 5 μm and a length of 1 cm. The expanded graphite powder is 50 mesh, with a carbon content of 93%. The resistivity of the conductive carbon black was 1.2 Ω·m.

[0059] Dissolve the phenolic resin with 10 times the mass of ethanol, and then mix it with the dry particles except the binder with an electric mixer for 1 hour, then add urotropine, and continue mixing for 30 minutes to obtain a slurry.

[0060] The slurry is subjected to the next molding process, and the molding process adopts the isostatic pressing process: fill the mixed slurry into the rubber mold, vacuumize after sealing, and discharge the air in the gap, and then put the rubber mold into water or...

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Abstract

The invention provides a preparation method of a special activated-carbon electrode block for capacitive deionizing equipment. Activated carbon powder, a binding agent, a carbon fiber, expanded graphite powder and conducting carbon black are loaded in a material box to be mixed; an obtained first mixture is agitated and mixed uniformly; the agitated and mixed first mixture is kneaded to be paste with plasticity; the well mixed paste is molded into a green compact in a fixed shape in molding equipment. The green compact is loaded in a heating furnace to be subjected to high-temperature calcination under the protection of a filling material; a primary product of the electric block is obtained. The primary product is made into an electrode according to the size, the shape and the precision needed by the electrode by adopting cutting machining. Finally, the activation treatment is carried out on the electrode; the electrode is made into a final product of the electrode. The method is low in preparation cost, and is easy for large-scale production. No binding agent resides in the electrode; the conductivity is good; the electrode is good in integrality and high in mechanical strength; the electrode can be cut to be in various needed shapes. The electrode can be used for preparing a capacitive deionizing device, and is used for the desalting treatment of water or the removal of harmful ions such as heavy metal ions, hardness, fluorine ions and the like in the water.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for preparing an activated carbon electrode block special for capacitive deionization equipment. [0002] Background technique: [0003] Capacitive deionization (CDI), also known as electrosorption technology (EST), its basic principle is based on the electric double layer theory in electrochemistry, and uses the electrochemical characteristics of the surface of the charged electrode to realize the adsorption and removal of charged particles in water and the removal of organic matter. for decomposition purposes. CDI has the advantages of low operating cost, no need to add chemicals, no secondary pollution, low requirements on influent water quality, simple operation and maintenance, adjustable desalination rate, high water recovery rate and long equipment life. [0004] Activated carbon (AC) has a large specific surface area and very good chemical stability, and is cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/312C02F1/469
CPCC02F1/469C02F1/4691
Inventor 施小东刘泽宇施秦峰郑立成
Owner ZHEJIANG DOWAY ADVANCED TECH CO LTD
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