The Complete Guide to Activated Carbon: Types, Applications & Selection
Activated carbon is one of the most versatile filtration media in the world. From purifying drinking water and gold recovery to air purification and food decolorization, activated carbon plays a critical role across industries. This guide covers everything you need to know.
What Is Activated Carbon?
Activated carbon is a form of carbon processed to have small, low-volume pores that increase the surface area available for adsorption or chemical reactions. It is produced from carbon-rich materials such as coconut shells, coal, wood, and petroleum pitch.
Raw Materials: Which One to Choose?
The raw material determines the key characteristics of the final product:
- Coconut Shell: High hardness, high iodine value (800-1200 mg/g). Best for gold recovery, premium water treatment, and gas phase adsorption.
- Coal Based: Available in bituminous and anthracite coal. Versatile and cost-effective for both liquid and gas phase applications.
- Wood Based: Phosphoric acid process produces high-purity powder carbon, ideal for decolorization in food, beverage, and pharmaceutical industries.
Physical Forms
| Form | Mesh / Diameter | Best For |
|---|---|---|
| Granular (GAC) | 4x10 to 30x60 mesh | Water treatment, gold recovery |
| Pellet (EAC) | 0.9mm - 8mm diameter | VOCs removal, H2S, air purification |
| Powdered (PAC) | 100 - 325 mesh | Decolorization, food & beverage |
| Honeycomb | Custom block sizes | VOC purification systems |
Key Technical Parameters
When selecting activated carbon, pay attention to these parameters:
- Iodine Value (mg/g): Measures microporosity. Higher = more adsorption capacity. Typical range: 600-1200.
- CTC Value (%): Chlorotoluene adsorption. Important for gas phase applications. Typical: 20-80%.
- Hardness (%): Resistance to attrition. Critical for gold recovery (CIP/CIL). Coconut shell > 97%.
- Ash Content (%): Lower is better for food/pharma applications. Typically 2-8%.
- Moisture Content (%): Typically < 5% for dry products.
How to Choose the Right Activated Carbon
Follow these steps to select the best carbon for your project:
- Identify your application: Water treatment, air purification, gold recovery, food decolorization, etc.
- Choose raw material: Coconut shell for premium/durable use; coal for cost-effective bulk; wood for powder decolorization.
- Select physical form: Granular for columns; pellet for gas phase; powder for batch processes.
- Confirm specifications: Iodine value, mesh size, hardness, CTC — match to your application requirements.
- Request samples: Test before bulk ordering. Huamei provides free samples for evaluation.
Need Help Selecting the Right Carbon?
Our technical team has 5+ years of experience in the activated carbon industry. Contact us for free consultation and samples.
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