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Aluminum electrolysis waste carbon-based porous carbon preparation method

A technology of aluminum electrolysis and porous carbon, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of waste carbon materials affecting the environment, etc., and achieve the effect of enhancing etching and promoting extension.

Pending Publication Date: 2019-09-17
绿业中试低碳科技(镇江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem in the prior art that waste carbon materials affect the environment in the process of aluminum electrolysis, the present invention provides a method for preparing porous carbon based on waste carbon for aluminum electrolysis, so as to solve the problem that the waste carbon materials in the process of aluminum electrolysis have no use value In order to expand the high value-added utilization field of aluminum electrolysis solid waste, a technical route of "treating waste with waste, turning waste into treasure, and turning solid waste into products"

Method used

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Effect test

Embodiment approach 1

[0019] The preparation method of aluminum electrolysis waste carbon-based porous carbon is as follows: 10 g of aluminum electrolysis anode carbon powder (carbon content ≥ 90% and particle size ≤ 0.15 mm) is used as raw material, and 30 g of potassium hydroxide and 3 g of calcium chloride are added. , mixed evenly, in a nitrogen atmosphere with a flow rate of 500 mL / min, the temperature was raised to 850 °C at a rate of 5 °C / min, kept for 1 h, and naturally cooled to room temperature, and then soaked in 1 mol / L hydrochloric acid for 0.5 h, Wash with distilled water until the pH is 7, put it in an oven at 105 °C for 24 h, and obtain a specific surface area of ​​1350 m 2 / g, the average pore diameter is 2.5 nm, and the bulk density is 0.65 g / m 2 porous carbon materials.

Embodiment approach 2

[0021] The preparation method of aluminum electrolysis waste carbon-based porous carbon is as follows: 10 g aluminum electrolysis anode carbon residue carbon powder (carbon content ≥ 99% and particle size ≤ 0.45 mm) is used as raw material, 10 g potassium carbonate is added, mixed evenly, and the flow rate is Under an argon atmosphere of 50 mL / min, raise the temperature to 700 °C at a rate of 10 °C / min, keep it warm for 5 h, then cool down to room temperature naturally, then wash it with distilled water until the pH is 7.8, and put it in an oven at 80 °C for 24 h , to obtain a specific surface area of ​​350 m 2 / g, the average pore diameter is 1.7 nm, and the bulk density is 0.45 g / m 2 porous carbon materials.

Embodiment approach 3

[0023] The preparation method of aluminum electrolysis waste carbon-based porous carbon is as follows: 10 g aluminum electrolysis anode carbon powder (carbon content ≥ 95% and particle size ≤ 0.075 mm) is used as raw material, and the flow rate is 500 mL / min nitrogen and 200 ml / min. In a carbon dioxide atmosphere for 1 min, the temperature was raised to 800 °C at a rate of 20 °C / min, kept for 10 h, and then cooled to room temperature naturally, then washed with deionized water until the pH was 7, and placed in an oven at 80 °C for 12 h to obtain The specific surface area is 450 m 2 / g, the average pore diameter is 3.6 nm, and the bulk density is 0.70 g / m 2 porous carbon materials.

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Abstract

The invention relates to the field of new materials, and discloses an aluminum electrolysis waste carbon-based porous carbon preparation method, which comprises: uniformly mixing an aluminum electrolysis waste carbon material and an activating component according to a mass ratio of 10:(0-100), carrying out a high-temperature reaction under a specific atmosphere condition, cooling to a room temperature, and washing to achieve the pH value of 5-9 so as to obtain the structure-controllable porous carbon material, wherein a mass ratio of the main component to the auxiliary component in the activating component is (10-0):(50-0). According to the present invention, the porous carbon material with the controlled pore parameters is obtained by using the solid waste carbon produced in the aluminum electrolysis process as the raw material through the high temperature activation treatment, such that the high value resource of the aluminum electrolysis waste carbon material is achieved; and by adjusting the type and the consumption of the activating agent and the process conditions, the structure parameters of the porous carbon can be precisely controlled, such that the method is the simple porous carbon preparation method capable of achieving scalability and high value utilization of waste.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a method for preparing aluminum electrolysis waste carbon-based porous carbon. Background technique [0002] Porous carbon materials have the characteristics of rich specific surface area, adjustable pore size, and controllable interface properties, etc., and are widely used in energy storage, drug carrier, matrix reinforcement, wave absorption, water purification and other fields. In theory, carbon-containing substances can be used as carbon sources for activated carbon, such as leaves, sludge, organic polymers, coal, petroleum coke, etc. The preparation process can be divided into physical activation method, chemical activation method, template method, self-assembly, etc. . To a certain extent, precise control of porous carbon can be achieved. [0003] During the electrolytic aluminum production, casting process and electrolytic cell overhaul process, a large amount of carbon haz...

Claims

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Application Information

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IPC IPC(8): C01B32/324C01B32/348
CPCC01B32/324C01B32/348
Inventor 张志华杨建红
Owner 绿业中试低碳科技(镇江)有限公司
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