Abstract: Fugitive emission during residual anode cooling is the main way for aluminum electrolytic HF entering the atmosphere. In response to this problem， a residual gas collection system was developed. Besides， the residual temperature， HF emission and the fugitive emission reduction effect of the system were studied under different gas flow rates. The results show that the residual gas collection system can reduce HF fugitive emission effectively. The initial temperature of the residual anode is 920℃. The temperature drops quickly and then slowly. The HF concentration increases with the increase of the flue gas flow， and decreases with the decrease of the flue gas temperature. Correlation analysis is carried out through the fitting function. After 4h， the cumulative HF emission reaches more than 95% of the total emission. HF fugitive emission is reduced by 0.201kg/t at the optimal gas flow rate(4000m³/h)， compared with no HF emission reduction measures.

Key words: residual anode cooling; fugitive emission; HF; residual gas collection system; aluminum electrolysis