Activated carbon is an adsorbent material widely used in industry and daily life to remove pollutants, odors and other harmful substances. However, it usually requires pickling during the activated carbon manufacturing process to ensure its adsorption performance and service life.
Why pickling? Pickled coconut shell activated charcoal is widely used in water treatment. Generally speaking, granular activated carbon and powdered activated carbon are mostly used for pickling. Pillar activated carbon is rarely used for pickling. Of course, it is also inseparable from the use of columnar activated carbon. Because columnar activated carbon is mainly used to adsorb industrial waste gas, but in general. General industrial waste gases are acidic, so if the columnar activated carbon is also acidic, basically industrial acidic gases cannot achieve good adsorption and purification.
Benefits of pickling activated carbon
- Reduce heavy metal content
- Remove soluble inorganic salt ash and degrade TDS concentration
- Adjust pH and improve the taste of water
- Reduce dust on the surface and pores of activated carbon and reduce the amount of black water produced
The pickling step of activated carbon usually includes the following key steps. Put the activated carbon into a large pickling tank. A specialized pickling agent, usually a mixture of hydrochloric acid and hydrofluoric acid, is then added to the pickling tank. The composition and proportion of the pickling agent can be adjusted according to the type of activated carbon and the desired cleaning effect.
The activated carbon is soaked in the pickling tank for a period of time, usually a few hours or even a full day. This allows the pickling agent to penetrate into the activated carbon and dissolve and remove some harmful substances and impurities. In addition, during the process of soaking the activated carbon, the activated carbon should be stirred regularly to ensure that the pickling agent is evenly distributed to each particle and to improve the cleaning effect.
The activated carbon needs to be rinsed thoroughly with water to remove all pickling agents. This usually requires multiple rinses until the water runs clear. After completing the pickling treatment, the activated carbon can be dried and activated again to restore its adsorption properties.
When carrying out pickling treatment of activated carbon, you need to pay attention to the following points. The appropriate pickling agent and proportion should be selected according to the required cleaning effect and type of activated carbon. Attention should be paid to the time and intensity of stirring and rinsing to ensure that the pickling agent is evenly distributed into each particle and all residual material is removed. To ensure personnel safety, personal protective equipment such as chemical protective gloves and respirators should be worn to avoid exposure to harmful chemicals and gases.
The activated carbon pickling process is a new cleaning process that is widely used in semiconductors, displays, optical devices and other fields. This process uses high-speed eddy current technology and ultrasonic cleaning technology to remove surface contaminants while avoiding damage and particle contamination caused by traditional cleaning methods.
The production process of acid pickling:
- Pretreatment: Put the items to be cleaned into a special pretreatment tank and rinse them with deionized water to remove dust and oil on the surface.
- Activated carbon acid cleaning: The activated carbon acid solution in the cleaning tank is heated to a suitable temperature, and then the objects to be cleaned are cleaned in the cleaning tank through high-speed eddy current technology and ultrasonic cleaning technology. This cleaning method efficiently removes contaminants without causing mechanical scratches or particle contamination.
- Rinsing: After cleaning, put the items to be cleaned into the rinsing tank and rinse with deionized water to remove residual activated carbon acid cleaning agent and contaminants.
- Drying: After rinsing, put the items to be cleaned into the drying tank and dry them by heating and ventilation.
The surface of the items cleaned through the activated carbon pickling process is smooth and non-damaging, which conforms to the tenets of environmental protection, high efficiency and energy saving, and is widely used in the field of high-end electronic device cleaning.
The difference between activated carbon pickling and water washing
Activated carbon pickling and water washing are two different cleaning methods. Activated carbon pickling uses activated carbon acid solution for cleaning, while water washing uses water as the main cleaning medium.
The advantage of activated carbon pickling is that it can deeply clean the pores and gaps on the surface of items, and it also has a good effect on removing bacteria, dust and odors. The size of activated carbon acid molecules is just right enough to penetrate into pores to achieve a deep cleansing effect. In addition, activated carbon pickling can also take into account the advantages of protecting the color of items and not damaging the texture of items.
However, the disadvantage of activated carbon pickling is that its cleaning efficiency is not high enough and requires multiple cleanings to achieve good results. At the same time, the cost of using activated carbon pickling is relatively high.
In contrast, although water washing has a relatively high cleaning efficiency, it cannot deal with deep-seated problems on the surface of items, and it is not as effective as activated carbon pickling in removing odors and bacteria.
In summary, activated carbon pickling and water washing each have their own advantages and disadvantages. It is very important to choose the appropriate cleaning method for different cleaning needs.