Quality control and testing methods in the production process of activated carbon

The production process of activated carbon involves multiple steps, from raw material selection and processing to final activation, screening, and packaging. Quality control is the key to ensuring that the performance of activated carbon meets application requirements throughout the entire production process. The following are quality control and testing methods in the production process of activated carbon:

Quality control measures:

Raw material control:

Choose suitable raw materials such as wood, bamboo, fruit shells, coal, etc.

Ensure the purity and quality of raw materials, and remove impurities.

Production process control:

Control the carbonization temperature, time, and atmosphere to ensure the uniformity of the carbonization process.

During the activation process, control the type, concentration, temperature, and time of the activator.

Monitor the operational status of production equipment to ensure stable process parameters.

Environmental Control:

Keep the production environment clean and prevent cross contamination.

Control the discharge of exhaust gas and wastewater to comply with environmental standards.

Staff Training：

Provide professional training to operators to ensure they understand the production process and quality requirements.

Test Method ：

Physical property detection:

Specific surface area: Use gas adsorption method (such as BET method) to determine the specific surface area of activated carbon.

Porosity: Analyze the pore size and distribution of activated carbon using mercury intrusion porosimetry or gas adsorption methods.

Particle size distribution: Use sieving method or laser particle size analyzer to detect the particle size of activated carbon.

Density: Determine the bulk density and true density of activated carbon.

Chemical property testing:

Ash content: The inorganic content in activated carbon is determined by weighing after high-temperature calcination.

Moisture: Use oven drying method to determine the moisture content of activated carbon.

PH value: The acidity or alkalinity of activated carbon is usually determined by the aqueous solution method.

Impurity content: Use chemical analysis methods to detect metal ions and other impurities in activated carbon.

Adsorption performance testing:

Iodine adsorption value: It measures the adsorption capacity of activated carbon for iodine and is commonly used as an indicator to evaluate the adsorption performance of activated carbon.

Methylene Blue Adsorption Value: Evaluating the Adsorption Capacity of Activated Carbon for Dyes.

Phenol adsorption value: detects the adsorption capacity of activated carbon for phenol.

Mechanical performance testing:

Strength: Determine the mechanical strength of activated carbon through compression testing.

Wear rate: Evaluate the wear of activated carbon during transportation and use.

Microbial testing:

For activated carbon used in the food and pharmaceutical industries, it is necessary to test the microbial content to ensure product sterility.

Through the above quality control measures and testing methods, the stability of the quality of activated carbon products can be ensured, meeting the needs of different application fields. Activated carbon manufacturers usually need to establish strict quality management systems based on national or industry standards, and further verify the quality of their products through third-party certification.