关键词: 氰化氢, 废气, 脱除技术

Abstract: Hydrogen cyanide (HCN) is an acutely poisonous pollutant，which might damage human health and atmospheric environment. The HCN-containing exhaust gases are commonly released to the air from nitrogen-containing fuel combustion，chemical processing，metallurgy，and vehicle exhaust emissions. This paper reviewed the recent progress of HCN removal technologies，including absorption，adsorption，combustion，catalytic oxidation and catalytic hydrolysis. The principle，applications，advantages and disadvantages of HCN removal were also analyzed. For high concentration HCN-containing exhaust gases，absorption and combustion have the advantages of high removal efficiency and simple purification processes. The decyanation agents of other processes are normally active at high temperatures，and the regeneration is relatively complicated. However，the secondary pollution is low compared to adsorption and combustion processes; therefore，it could have advantages in precise decyanation. The combined application of various removal technologies in the future can not only remove HCN effectively，but also recover and utilize high concentration CO which can be used as a raw material gas in chemical industry. Even though the combined applications may still have some obstacle，such as relatively high cost and difficulties in control technology，it is still a new development trend with bright prospects for HCN removal.

Key words: hydrogen cyanide, exhaust gas, removal technologies