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This study employed microwaveMicrowave calcination technology to produce antimony trioxideAntimony trioxide (Sb2O3) from low-grade antimony-sulfide-oxygen mixed ore. Through dielectric and thermodynamic analysis of the ore's oxidationOxidation volatilization, the reaction trends and heating characteristics of microwaveMicrowave oxidationOxidation volatilization were revealed. The effects of calcination temperatureTemperature, soaking time, and air flow rate on oxidationOxidation calcination efficiency were investigated. Experimental results indicate that at 750 °C calcination temperatureTemperature, 15 min soaking time, and 0.8 m3/h air flow rate, the product volatilization rate reached 34.99% with S impurity content as low as 0.45%. Kinetics analysis indicates that the oxidationOxidation reaction of antimony-sulfide mixed ore under microwave irradiationMicrowave irradiation can be divided into three stages: chemically controlled (25–200 °C), diffusion-controlled (200–600 °C), and chemically controlled (600–800 °C). Compared with traditional processes, microwaveMicrowave oxidationOxidation volatilization features rapid heating and high reaction efficiency while reducing SO₂ emissions and energy consumption.

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Process and Kinetics of Preparing Antimony Trioxide by Microwave Oxidation of Volatile Antimony-Sulfur-Oxygen Mixed Ore

  • 会议论文

  • 发表日期：

    2026年

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  • Luo Zhengju,
  • Liu Chenhui,
  • Wang Yongli,
  • Zhou Pan,
  • Li Yalun

摘要

This study employed microwaveMicrowave calcination technology to produce antimony trioxideAntimony trioxide (Sb2O3) from low-grade antimony-sulfide-oxygen mixed ore. Through dielectric and thermodynamic analysis of the ore's oxidationOxidation volatilization, the reaction trends and heating characteristics of microwaveMicrowave oxidationOxidation volatilization were revealed. The effects of calcination temperatureTemperature, soaking time, and air flow rate on oxidationOxidation calcination efficiency were investigated. Experimental results indicate that at 750 °C calcination temperatureTemperature, 15 min soaking time, and 0.8 m3/h air flow rate, the product volatilization rate reached 34.99% with S impurity content as low as 0.45%. Kinetics analysis indicates that the oxidationOxidation reaction of antimony-sulfide mixed ore under microwave irradiationMicrowave irradiation can be divided into three stages: chemically controlled (25–200 °C), diffusion-controlled (200–600 °C), and chemically controlled (600–800 °C). Compared with traditional processes, microwaveMicrowave oxidationOxidation volatilization features rapid heating and high reaction efficiency while reducing SO₂ emissions and energy consumption.