Abstract: Sintering head ash of iron and steel enterprises is bulk industry solid pollutant. Although the sinter head ash is not listed in the National Hazardous Waste List (2021 edition)，in order to strengthen the management of the sinter head ash of iron and steel smelting enterprises in Hunan Province，the hazardous characteristics of the head ash from three typical iron and steel smelting enterprises in Hunan Province，Loudi，Xiangtan and Hengyang were selected for research. The results showed that the sintering machine head ash of the three iron and steel enterprises are all hazardous wastes. The head ash of iron and steel enterprises in Loudi and Xiangtan have the hazardous characteristics of lead leaching toxicity. The head ash of Iron and Steel Enterprise in Hengyang has the hazard characteristics of cadmium leaching toxicity and lead tetroxide toxicity. There are significant differences in the lead leaching concentration and toxic substance content of the machine head ash of the three enterprises，and the lead leaching toxic concentration is significantly related to the pH value of the machine head ash.

Key words: iron and steel enterprise, sintering machine head ash, hazard characteristics