Preparation method of super activated carbon and method for recycling waste liquid and producing carbonate by-product

Abstract

The invention relates to the fields of biological material processing, energy materials and environmental protection, and discloses a preparation method for super activated carbon and a method for recycling a produced waste liquid and by-producing a carbonate. The preparation method for the super activated carbon comprises the following steps: contacting a carbonaceous material with an oxidizing agent and a hydrated alkaline activator under vacuum conditions, and immersing the oxidizing agent and the hydrated alkaline activator into the carbonaceous material; performing first heat treatment onthe carbonaceous material in which the oxidizing agent and the hydrated alkaline activator are immersed to activate the carbonaceous material and obtain a carbon dioxide gas; and performing cooling on the obtained activated carbonaceous material, performing washing, and performing drying to obtain the super activated carbon and the carbon dioxide gas. The invention also discloses that the waste liquid produced by the above process is treated at different pH values to realize recovery of by-products and recycling of the waste liquid. According to the method provided by the invention, through the above method, the product yield can be effectively improved, the waste liquid can be recycled and the by-products can be recycled; and the method saves energy, protects the environment, and has significant social, environmental and economic benefits.

Description

technical field [0001] The invention relates to the fields of biological material processing, energy materials and environmental protection, in particular to a method for preparing super activated carbon and a method for recycling waste liquid produced in the preparation process of super activated carbon and producing carbonate by-products. Background technique [0002] Activated carbon with high specific surface is obtained by high-temperature carbonization of natural plant materials, such as straw, wood and other biological materials, which are widely used in traditional fields such as food, chemical industry, water and air purification. In recent years, it has been found that coconut shells, peach shells, and apricot shells can obtain activated carbon with a higher specific surface area after carbonization and activation processing. This activated carbon is generally called high-grade activated carbon. Generally, the specific surface of the existing shell carbon activated...

AI Technical Summary

Problems solved by technology

[0007] (1) Due to the strong corrosiveness of KOH, the alkali vapor, alkali mist and alkali droplets produced in the high-temperature production process also have a strong corrosive effect on the respiratory tract and equipment of employees, directly affecting the health of employees

[0008] (2) After the activation is completed, a large amount of alkali metal carbonate and residual KOH alkaline waste liquid will be produced during the washing of activated carbon. The concentration is high and the alkali is strong, and direct discharge will also seriously pollute the environment.

If the method of acid neutralization is used (new carbon material, Vol.14, No.2, 1999.6), the acid consumption is large, the cost is high, and it will cause material waste, which is not suitable for large-scale production

[0009] (3) Due to the high specific surface area of ​​super activated carbon, it has a strong adsorption capacity for ions, so the metal ion impurities adsorbed in the micropores of super activated carbon are difficult to be taken out by pure water. Usually, its washing process not only consumes a large amount of pure water and requires up to a week of cleaning time, resulting in high post-processing and labor costs

Unfortunately, this invention does not consider the recovery of the main by-product potassium carbonate in the activation waste liquid

Images