Small Chlorine Furnace | Impurity Separation by Selective Volatilization of Metal Chlorides

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last updated：Jun 05, 2026

サーモニックENG

Chloride metal impurities with Cl2 and HCl, leaving the base material for selective separation.

The "small-scale chlorine furnace" is a test furnace designed for a dry process that uses halogen gases such as Cl2 and HCl to convert and separate metal impurities into volatile chlorides. Impurities in materials such as Fe, Ni, Cu, Al, Na, Cr, and P may become chlorides with different vapor pressures and boiling points than the base material through chlorination. By utilizing this property, conditions can be examined to selectively volatilize and separate only the impurities while leaving the base material intact by adjusting temperature, gas type, and treatment time. It is suitable for cases where one wants to minimize waste liquid treatment and drying processes like those in wet processing, as well as for reducing impurities in powders, ceramics, and high-purity materials that are sensitive to moisture. 【Features】 ■ Compatible with selective chlorination using Cl2 and HCl ■ Examination of separation of metal impurities as volatile chlorides ■ Dry purification utilizing vapor pressure differences and reaction temperature differences ■ Applicability to high-purity powders, ceramics, SiC, Si3N4, Al2O3, etc. ■ Comparison of temperature, gas concentration, and treatment time with small sample sizes *For more details, please download the materials or contact us.

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basic information

【Concept of Selective Chlorination】 ■ Conversion of Metal Impurities to Chlorides - Use of Cl2, HCl, etc., to chlorinate Fe, Ni, Cu, Al, Na, etc. - Consideration of separation conditions utilizing the reactivity difference between the base material and impurities. ■ Utilization of Volatility and Vapor Pressure Differences - Use of boiling points and vapor pressure differences of the generated metal chlorides. - Gradual setting of temperature conditions to target the volatilization of only the desired components. ■ Differences from Wet Processing - A dry process that minimizes wastewater treatment, cleaning, and drying steps. - Applicable to water-sensitive materials and powder materials that dislike moisture. - Contributes to reducing the risk of recontamination after treatment. ■ Condition Exploration in a Small Furnace - Comparison of temperature, gas types, concentrations, and time using small sample sizes. - Feasibility of scale-up specifications based on test results. *Specifications will be proposed according to materials, target impurities, treatment temperatures, gas types, and removal conditions.

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Applications/Examples of results

【Applications】 ■ Dry separation of Fe, Ni, Al, Na, etc. in high-purity Si, SiC, Si3N4, Al2O3 ■ Reduction of impurities in ceramics, oxides, nitrides, and carbide powders ■ Investigation of removal of Cr, Ni, P, etc. in alloys, cast iron, and metal powders ■ Reduction of impurities such as Cu, Fe, Cl, etc. in catalyst powders and functional powders ■ Consideration of replacing wet purification with dry purification ■ Selective separation and recovery of rare metals and metal components ■ Small-scale chlorination tests in the research and development stage 【For such challenges】 ■ Waste liquid, drying, and re-contamination are issues in wet processing ■ Want to remove only specific metal impurities without dissolving the base material ■ Aim to reduce metal impurities to ppm to ppb levels ■ Want to process moisture-sensitive materials and powders that dislike water ■ Want to confirm separation conditions utilizing the volatility differences of metal chlorides ■ After confirming conditions in a test furnace, consider expansion to mass production furnaces 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.