Recovering antimony trioxide from the flue gas of antimony rotary furnaces relies on the synergy between precise temperature control and efficient dust removal.

High-temperature flue gas (approximately 1200°C) generated during rotary furnace smelting first enters an annular flue for preliminary cooling. Since antimony trioxide exists in vapor form at high temperatures, temperature control is critical: dropping below 500°C causes premature condensation and pipe blockages, whereas the 550–600°C range is ideal—preventing low-temperature adhesion while allowing the majority of coarse dust to settle naturally due to the sudden drop in gas velocity. This stage serves the dual purpose of pre-dedusting and stabilizing operating conditions.

The cooled flue gas then enters a baghouse dust collector for final recovery. Filter bags typically utilize high-temperature, hydrolysis-resistant, and corrosion-resistant PPS or PTFE-membrane-coated media; the PTFE membrane enables surface filtration, achieving a capture efficiency of over 99.9% for fine Sb₂O₃ particles. The collected powder is high-purity antimony trioxide, ready for direct sale without further processing.

The primary challenge of the recovery process lies in the precise control of the temperature window: excessively high temperatures allow antimony trioxide to escape through the filter bags, while excessively low temperatures lead to condensation and "blinding" (clogging) of the bags—both scenarios causing a sharp decline in dust collection efficiency. Consequently, matching the cooling rate in the annular flue with the operating conditions of the dust collector directly determines the economic value of the recovery process.