Small Chlorine Furnace | Supports High Purification of CNT, Graphite, and Carbon Black

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last updated：Jun 05, 2026

サーモニックENG

Dry removal of metal impurities in CNT, graphite, and carbon black using Cl2/HCl.

In the high purification of carbon powder, metal impurities such as Fe, Ni, Al, and Cu can affect conductivity, battery characteristics, catalytic activity, and the quality after graphitization treatment. Our small chlorine furnace can explore conditions for the dry removal of metal impurities remaining in CNTs, carbon black, synthetic graphite, conductive additives, etc., as volatile chlorides through selective chlorination using Cl2/HCl. Unlike wet processing, it reduces the need for washing water, waste liquid treatment, and drying processes, making it suitable for carbon materials that dislike moisture and for powder processing where re-agglomeration and re-contamination after drying should be avoided. Additionally, by considering negative pressure operation and oxygen partial pressure in the furnace configuration, it is possible to explore impurity removal conditions while suppressing the oxidation and wear of the carbon substrate. 【Features】 ■ Compatible with selective chlorination using Cl2/HCl ■ Capable of examining the removal of Fe/Ni/Al in CNTs, graphite, and carbon black ■ Reduces waste liquid and drying processes associated with wet processing ■ Suppresses the impact on the carbon substrate through negative pressure operation and oxygen partial pressure management ■ Allows comparison of temperature, gas concentration, and processing time with small sample sizes *For more details, please download the materials or contact us.

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basic information

■ Conversion of metal impurities to chlorides - Chlorides of Fe, Ni, Al, Cu, etc. are produced using Cl2 and HCl - Utilize the volatility of the generated chlorides to separate them from the carbon substrate ■ Suppression of impact on the carbon substrate - Manage negative pressure operation, oxygen partial pressure, and treatment temperature - Consider conditions that suppress oxidation, wear, and surface degradation of carbon ■ Differences from wet treatment - Reduce washing water, waste liquid treatment, and drying processes - Contribute to reducing the risk of re-agglomeration and re-contamination during drying - Applicable to carbon materials that are sensitive to moisture ■ Condition exploration in a small furnace - Compare temperature, gas types, concentration, and time with small sample sizes - Based on test results, consider expansion to mass production furnaces and dedicated furnace specifications *Specifications will be proposed according to materials, target impurities, treatment temperature, gas types, and removal conditions.*

Price information

*The price may vary depending on the specifications of the equipment, so please feel free to contact us for more details.

Delivery Time

Please contact us for details

※*The delivery date may vary depending on the equipment specifications, so please feel free to contact us for more details.

Applications/Examples of results

【Applications】 ■ Reduction of Fe/Ni/Co catalyst residues in CNT and CNF ■ Removal of metal impurities in carbon black and conductive additives ■ Purification of synthetic graphite, natural graphite, and graphite powder ■ Pretreatment of carbon powder for LIB anode materials, conductive materials, and battery materials ■ Impurity cleaning before high-temperature graphitization ■ Dry purification of high-purity carbon materials and carbon materials for semiconductors ■ Evaluation of replacement from wet purification to dry purification 【For such challenges】 ■ Waste liquid, drying, and re-agglomeration are issues in wet processing ■ Desire to reduce catalyst metals remaining in CNT and carbon black ■ Want to remove metal impurities such as Fe, Ni, Al, and Cu ■ Aim to process while suppressing oxidation and consumption of carbon base materials ■ Want to confirm chlorination conditions with small sample sizes ■ After confirming conditions in a test furnace, consider expansion to a mass production furnace Even at a stage where materials, target impurities, processing temperatures, gas concentrations, and removal conditions are not yet determined, you can consult us according to your application.