Rotary furnace pyrometallurgy (volatilization roasting method) is one of the mainstream mature processes for producing antimony trioxide, and has significant advantages over other pyrometallurgical processes:

1. Strong adaptability to raw materials: It can efficiently process low-grade antimony ores, including difficult-to-select and complex ores, and can also process ores with antimony content below 20%. It can also handle powder ores, lump ores and a variety of antimony-containing materials, and has loose requirements on raw material particle size.

2. High volatilization and recovery rate: The structure and rotation of the rotary furnace allow the material to fully contact the hot air flow, and the temperature and air in the furnace are precisely controlled, which is conducive to the volatilization of antimony oxides. The volatilization rate usually exceeds 95%, and the highest is 98%, and the total metal recovery rate is high.

3. Strong continuous production: The process can be highly continuous and automated, with continuous feeding and slag discharge, stable furnace temperature, large processing capacity, and suitable for large-scale production.

4. Excellent product quality: The volatilized Sb2O₃ vapor is cooled and condensed by the dust collection system to form high-purity (over 99.5%) high-quality smoke, good physical form, and low impurity content.

5. Good energy consumption and environmental protection: high thermal efficiency, latent heat of volatile steam can be recycled, and unit product energy consumption is low; antimony loss is small, centralized flue gas treatment is easy to meet the standard, and the slag has a stable low antimony content and can be used as general solid waste treatment.

6. Mature process and significant scale benefits: mature and reliable process, perfect operating parameters and control system; large rotary furnace has large processing capacity, low unit investment and operating costs, and significant scale economy benefits.

The core advantages of rotary furnace pyrometallurgy for smelting antimony trioxide are its strong raw material adaptability, extremely high antimony volatilization recovery rate, excellent continuous large-scale production capacity, high-purity product quality and relatively good environmental controllability (within the scope of pyrometallurgy). These advantages make it the most important and economical method for processing complex low-grade antimony ores, achieving efficient recovery of antimony resources and high-quality antimony trioxide production.