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Method for preparing coke-powder-based carbon adsorbing material by using waste coke powder

A carbon adsorption, coke powder technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of low specific surface area, equipment corrosion, large amount of potassium hydroxide activation, etc., to achieve the effect of good adsorption and low cost

Inactive Publication Date: 2010-09-01
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of potassium hydroxide is used for activation, and the activation process is difficult to control and may cause excessive activation. The activated pore structure is mainly medium and large pores; the specific surface area is low and the equipment is severely corroded.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Waste coke powder (2.26% moisture, 13.5% ash, 4.55% volatile matter, 0.8% sulfur content, 78.89% fixed carbon) was crushed, sieved to 160-180 mesh, and the raw material was pre-oxidized with an equal amount of nitric acid. Take pretreated coke powder: ZnCl 2 = 1:5 mixed with an appropriate amount of water to form a paste, put it into a muffle furnace, the heating rate was 5°C / min, and when the temperature was raised to 350°C, the temperature was kept constant for 1 hour. Under nitrogen protection (nitrogen flow rate 160cm 3 / min) continue to heat up to 850°C, activate for 120 minutes and cool to room temperature to obtain crude carbon adsorption material. Washing with hot deionized water and drying to obtain refined coke powder-based carbon adsorption material. The yield was 40.8%, and the methylene adsorption amount was 50.7 mg / g.

Embodiment 2

[0019] Waste coke powder (2.26% moisture, 13.5% ash, 4.55% volatile matter, 0.8% sulfur content, 78.89% fixed carbon) was crushed, sieved to 200 mesh, and the raw material was pre-oxidized with an equal amount of nitric acid. Take pretreated coke powder: ZnCl 2 = 1:5 mixed with an appropriate amount of water to form a paste, put it into a muffle furnace, the heating rate is 8°C / min, and when the temperature rises to 350°C, keep the temperature for 1 hour. Under nitrogen protection (nitrogen flow rate 160cm 3 / min) continue to heat up to 850°C, activate for 120 minutes and cool to room temperature to obtain crude carbon adsorption material. Washing with hot deionized water and drying to obtain refined coke powder-based carbon adsorption material. The yield was 39.1%, and the methylene adsorption amount was 44.5 mg / g.

Embodiment 3

[0021] Waste coke powder (2.26% moisture, 13.5% ash, 4.55% volatile matter, 0.8% sulfur content, 78.89% fixed carbon) was crushed, sieved to 140-160 mesh, and the raw material was pre-oxidized with an equal amount of nitric acid. Take pretreated coke powder: ZnCl 2 = 1:5 mixed with an appropriate amount of water to form a paste, put it into a muffle furnace, the heating rate is 6°C / min, and when the temperature is raised to 350°C, keep the temperature for 1 hour. Under nitrogen protection (nitrogen flow rate 160cm 3 / min) continue to heat up to 850°C, activate for 120 minutes and cool to room temperature to obtain crude carbon adsorption material. Washing with hot deionized water and drying to obtain refined coke powder-based carbon adsorption material. The yield was 42.8%, and the methylene adsorption amount was 34.1 mg / g.

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Abstract

The invention discloses a method for preparing a coke-powder-based carbon adsorbing material by using waste coke powder. The method comprises the following steps of: (1) crashing a waste coke powder raw material and screening the crashed waste coke powder raw material by using a screen of 100 meshes; mixing the coke powder and concentrated nitric acid in a mass ratio of 1:1; stirring the mixture uniformly; and standing for 12 hours in an airtight way to obtain a preoxidation product; (2) mixing the preoxidation product and an active agent of ZnCl2 in a mass ratio of 1 / 2-1 / 6; stirring the mixture with an appropriate amount of water uniformly; moving the mixture into a muffle furnace, heating to the temperature of about 350 DEG C at a heating speed of 2 to 10 DEG C per minute; keeping a constant temperature for 1 hour; continuing heating to the temperature of between 650 and 900 DEG C under the protection of nitrogen; activating for 1 to 3 hours; and cooling to the room temperature to obtain a rough coke-powder-based carbon adsorbing material; and (3) washing the coke-powder-based carbon adsorbing material with hot deionized water and drying to obtain a refined coke-powder-based carbon adsorbing material.

Description

technical field [0001] The invention belongs to a method for preparing a carbon adsorption material. Waste coke powder is used as a raw material for preparing the carbon adsorption material, and a zinc chloride chemical activation method is used. Background technique [0002] Coke powder recycling technology research is a research project of energy saving, consumption reduction and environmental protection. In recent years, many scientific and technological workers at home and abroad have reported a lot on the preparation of high-performance activated carbon with petroleum coke, but there are few reports on the preparation of carbon adsorption materials by activation of waste coke powder. Cui Yongjun et al. studied the feasibility of preparing coke powder-based carbon adsorption materials from waste coke powder using waste coke powder in the particle size range of 1-3mm as raw materials. The obtained product has the characteristics of developed non-micropores (medium and ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30
Inventor 雒和明冯辉霞俞树荣张建强张得懿赵霞王毅苟国俊周应萍张婷
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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