Small Chlorine Furnace | Dry Removal of Metal Impurities from Ceramic Powder

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last updated：Jun 05, 2026

サーモニックENG

Selective removal of metal impurities from SiO2・Al2O3・Si3N4 powder while leaving the base material intact.

In the high purification of ceramic powders, metal impurities such as Fe, Ni, Cr, and Na can affect product characteristics, sinterability, insulation properties, and yield. Our small chlorine furnace can explore conditions for the dry removal of metal impurities mixed in ceramic powders like SiO2, Al2O3, and Si3N4 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 processing moisture-sensitive powders and high-purity materials that want to avoid recontamination. By comparing temperature, gas type, gas concentration, and treatment time with small samples, it can be utilized for the prototyping and condition exploration of high-purity ceramic powders. 【Features】 ■ Supports selective chlorination using Cl2/HCl ■ Allows for the dry removal of metal impurities such as Fe, Ni, Cr, and Na ■ Applicable to ceramic powders like SiO2, Al2O3, and Si3N4 ■ Reduces waste liquid and drying processes associated with wet processing ■ Enables comparison of temperature, gas concentration, and treatment time with small samples *For more details, please download the materials or contact us.

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basic information

**Concept of Dry Chlorination** ■ Conversion of Metal Impurities to Chlorides - Conversion of Fe, Ni, Cr, Na, etc. to chlorides using Cl2 and HCl - Utilization of the volatility of the produced chlorides for separation from the base material ■ Selective Treatment Leaving the Base Material - Utilization of the reactivity differences with the base material such as SiO2, Al2O3, Si3N4 - Adjustment of treatment temperature, gas concentration, and treatment time to suppress the influence on the base material ■ Differences from Wet Treatment - Reduction of washing water, wastewater treatment, and drying processes - Potential application for powders that dislike moisture or materials that need to avoid recontamination ■ Condition Exploration in a Small Furnace - Comparison of conditions with small sample sizes is possible - Based on test results, consideration for expansion to mass production furnaces or dedicated furnace specifications is possible *Specifications will be proposed according to the material, target impurities, treatment temperature, gas type, and removal conditions.*

Price information

*Please feel free to contact us for more details, as prices vary depending on the device specifications.

Delivery Time

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※*Due to variations in equipment specifications, delivery times may differ. Please feel free to contact us for more details.*

Applications/Examples of results

【Applications】 ■ Reduction of metal impurities in high-purity silica fillers ■ Investigation of removal of Fe/Ni/Cr in alumina abrasives and Al2O3 powder ■ Purification of ceramic powders such as Si3N4, SiC, and AlN ■ Dry purification of ceramic materials for electronic components ■ Investigation of removal of surface-adhered metals from powders and molded bodies ■ Evaluation of replacement from wet purification to dry purification ■ Small-scale chlorination tests in the research and development stage 【For such challenges】 ■ Waste liquid, drying, and recontamination are issues in wet processing ■ Desire to purify ceramic powders that are sensitive to moisture ■ Aim to reduce metal impurities such as Fe, Ni, Cr, and Na ■ Want to maintain the particle size, shape, and surface condition of the base material as much as possible ■ Wish to confirm chlorination conditions with small sample sizes ■ After confirming conditions in a test furnace, consider expansion to a 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.