Method utilizing melt salt activation to prepare active carbon

Abstract

The invention discloses a method utilizing melt salt activation to prepare active carbon. The method comprises the following steps: grinding and drying raw materials, placing the grinded and dried raw materials in a heating furnace, carrying out constant temperature pyrolysis under a certain temperature condition, adding the coke generated during the pyrolysis process into melt salts to carry out constant temperature reactions for a while, heating the coke in an inert gas atmosphere to a certain temperature, carrying out constant temperature activation at the temperature for a while, cooling the coke to the room temperature, soaking the coke in a hydrochloric acid solution with a certain concentration, washing the coke with water until the coke becomes neutral, and finally drying so as to obtain the active carbon. The preparation method can obtain high quality active carbon, utilizes the good permeability of melt salts at a high temperature to reduce the salt waste and volatilization in the preparation process and the pyrolysis process, shortens the preparation time, greatly reduces the production cost of active carbon, and promotes the technology innovation of active carbon production.

Description

technical field [0001] The invention belongs to the field of active carbon preparation, and relates to a method for preparing active carbon by activating molten salt. Background of the invention [0002] Activated carbon is a carbonaceous material with a large specific surface area and well-developed pores, and has excellent adsorption capacity. Adsorption, separation, purification and energy storage of phase and gas phase substances. [0003] There are many ways to prepare activated carbon, which are mainly divided into physical activation method, chemical activation method and physical chemical activation method according to the nature of the activator. The advantage of the physical activation method is that the process is simple, the preparation cost is low, the pollution to the environment is small, and no washing is required in the later stage. The disadvantage is that the activation temperature is high, the quality of the activated carbon is relatively low, and the ec...

AI Technical Summary

Problems solved by technology

In order to improve the quality of activated carbon, it is common to increase the amount of chemical reagents in the process of preparing activated carbon. The above methods will inevitably lead to increased costs and aggravated pollution.

In the actual preparation process of activated carbon, a large part of the chemical reagents is wasted due to high-temperature volatilization, and cannot actually participate in the activation process, resulting in low utilization of the activation reagents; another core problem: after the chemical reagents are mixed with raw materials and coke, it takes a certain amount of time. The time for the chemical reagents to fully immerse in the raw materials and coke, this process will lead to the extension of the cycle of activated carbon preparation, and increase the cost and efficiency of the preparation in a disguised form

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