Frequently Asked Questions

We offer a comprehensive range of activated carbon products to meet diverse industrial needs:

By Raw Material:

• Coconut Shell Activated Carbon — High hardness, excellent micropore structure, ideal for water purification and gold recovery
• Coal-Based Activated Carbon — Balanced pore distribution, cost-effective for water treatment and gas purification
• Wood-Based Activated Carbon — Superior decolorization performance for food, sugar, and pharmaceutical applications

By Physical Form:

• Powdered Activated Carbon (PAC) — Fine particles for rapid adsorption in batch processes
• Granular Activated Carbon (GAC) — Various mesh sizes for fixed-bed systems
• Pellet/Extruded Activated Carbon — Uniform cylindrical shape for gas-phase applications

Each type is available in multiple grades and specifications. Contact our team for personalized recommendations.

Selecting the optimal activated carbon depends on several key factors:

Application Considerations:

• Target contaminants — What substances need to be removed?
• Phase — Liquid (water, solvents) or gas (air, emissions)?
• Flow rate & contact time — Determines required bed depth and particle size
• Operating conditions — Temperature, pH, and pressure

Product Recommendations by Application:

Application	Recommended Type
Drinking water purification	Coconut shell GAC
Gold recovery	Coconut shell, high iodine number
Industrial wastewater	Coal-based GAC
Air/gas purification	Pellet or coal-based carbon
Food/beverage decolorization	Wood-based PAC
Solvent recovery	Pellet activated carbon

Our technical team can provide personalized recommendations based on your specific requirements. Contact us with your application details for expert guidance.

Our minimum order quantities are designed to accommodate both trial orders and bulk purchases:

Standard Orders:

• Minimum order: 1 metric ton for most activated carbon products
• Available in 25kg bags, 500kg jumbo bags, or custom packaging

Trial Orders:

• Smaller quantities available for testing and evaluation purposes
• Ideal for new customers to verify product suitability

Bulk Orders:

• Competitive volume pricing for orders of 10+ tons
• Flexible scheduling for regular supply contracts

Please contact our sales team for specific MOQ and pricing details based on your requirements.

We ship worldwide with flexible delivery options to meet your timeline and budget.

Shipping Methods:

Method	Transit Time	Best For
Sea Freight (FCL)	15–30 days	Large volume orders
Sea Freight (LCL)	20–35 days	Smaller orders
Air Freight	5–7 days	Urgent orders
Express Courier	3–5 days	Samples, small packages

Packaging Options:

• 25kg PP woven bags on pallets
• 500kg jumbo bags (FIBC)
• 1000kg jumbo bags
• Custom packaging available

Trade Terms: We accommodate various Incoterms including:

• FOB (Free on Board)
• CIF (Cost, Insurance, and Freight)
• EXW (Ex Works)
• DDP (Delivered Duty Paid) for select destinations

We handle all export documentation, customs clearance support, and provide tracking information for every shipment.

Yes, we provide free product samples for qualified buyers to evaluate our quality before placing orders.

Sample Details:

• Sample quantity: 1–5 kg depending on product type
• No charge for the sample itself
• Available for all product categories

Shipping Arrangements:

• Express courier delivery (DHL, FedEx, UPS)
• Shipping costs covered for serious inquiries
• Typical delivery: 3–7 business days worldwide

How to Request:

1. Contact our sales team via email or website form
2. Provide your application details and requirements
3. Specify the product type(s) you wish to evaluate
4. We will prepare and ship appropriate samples

Our technical team can also provide guidance on testing methods and expected performance for your specific application.

The iodine number is a key indicator of activated carbon’s adsorption performance.

Definition: The iodine number measures the mass of iodine (in mg) adsorbed per gram of carbon (mg/g). It primarily indicates the carbon’s micropore content — pores smaller than 2 nanometers.

Why It Matters:

• Higher iodine numbers indicate greater surface area and microporosity
• Micropores are essential for adsorbing small organic molecules
• It helps predict performance in water treatment and purification applications

Typical Values:

Product Type	Iodine Number Range
Coconut shell carbon	900–1200 mg/g
Coal-based carbon	800–1100 mg/g
Wood-based carbon	700–1000 mg/g

Application Guidelines:

• For drinking water treatment: 900+ mg/g recommended
• For gold recovery: 1000+ mg/g preferred
• For general wastewater: 800+ mg/g acceptable

Our team can help you select the right specification for your needs.

Yes, spent activated carbon can often be thermally regenerated and reused, offering both economic and environmental benefits.

Regeneration Process: Thermal reactivation involves heating spent carbon to high temperatures (800–900°C) in a controlled atmosphere. This process:

• Removes adsorbed organic contaminants
• Restores the carbon’s pore structure
• Recovers 80–95% of original adsorption capacity

Mass Loss Considerations:

• Typically 5–10% of carbon mass is lost per regeneration cycle
• After multiple cycles, fresh carbon must be added to maintain volume

When Regeneration Makes Sense:

• Large volume applications (10+ tons per cycle)
• Consistent contaminant types
• Locations near reactivation facilities
• Environmental sustainability goals

Our Services: We offer reactivation services and can advise on:

• Whether regeneration is cost-effective for your application
• Optimal regeneration schedules
• Transportation and logistics arrangements

Contact our technical team for a feasibility assessment.

Tanjin Carbon maintains rigorous quality standards with internationally recognized certifications.

Management System Certifications:

• ISO 9001:2015 — Quality Management System
• ISO 14001:2015 — Environmental Management System

Product Certifications:

• NSF/ANSI 61 — Drinking water system components
• AWWA B604 — Activated carbon standards for water treatment
• Food-grade certifications — For food and beverage processing applications

Quality Assurance:

• Every shipment includes a Certificate of Analysis (COA)
• In-house laboratory testing for all production batches
• Third-party testing available upon request
• Full traceability from raw material to finished product

Testing Capabilities: Our quality control laboratory performs comprehensive testing including iodine number, CTC value, ash content, moisture, particle size distribution, and hardness testing.