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This study investigates the effects of rotational speed (0–10 rpm) and temperatureTemperature (550–650 °C) on the oxidation roasting of molybdenite (MoS2) concentrateMolybdenite concentrate in a rotary kilnRotary kiln operation. Computational predictions indicated that MoO2 production is more favorable than MoO3 up to a certain stage, after which MoO3 forms by consuming MoO2. A drum rotational speed above 5 rpm significantly increased the sulfur reduction rate, reducing sulfur content to below 5% at 60 min. Lowering the temperatureTemperature from 650 to 550 °C also decreased sulfur content. The conversion rateConversion rate of MoS2 to MoxOy (MoO2 + MoO3) generally increased with drum rotational speed and reaction time. Optimal conditions (5–10 rpm and 550–600 °C) achieved a high conversion rateConversion rate (97–98%). Consequently, appropriate drum rotational speed and low temperatureTemperature are crucial for efficient MoO3 production.

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Optimization of Rotary Kiln in Molybdenite Concentrate Oxidation for Molybdic Trioxide Production

  • 会议论文

  • 发表日期：

    2025年

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  • Jungho Heo,
  • Seongsoo Han,
  • Hyunsik Park,
  • Joobeom Seo

摘要

This study investigates the effects of rotational speed (0–10 rpm) and temperatureTemperature (550–650 °C) on the oxidation roasting of molybdenite (MoS2) concentrateMolybdenite concentrate in a rotary kilnRotary kiln operation. Computational predictions indicated that MoO2 production is more favorable than MoO3 up to a certain stage, after which MoO3 forms by consuming MoO2. A drum rotational speed above 5 rpm significantly increased the sulfur reduction rate, reducing sulfur content to below 5% at 60 min. Lowering the temperatureTemperature from 650 to 550 °C also decreased sulfur content. The conversion rateConversion rate of MoS2 to MoxOy (MoO2 + MoO3) generally increased with drum rotational speed and reaction time. Optimal conditions (5–10 rpm and 550–600 °C) achieved a high conversion rateConversion rate (97–98%). Consequently, appropriate drum rotational speed and low temperatureTemperature are crucial for efficient MoO3 production.