Abstract: Aiming to control the O₂ content in exhaust gas during magnetization roasting of 100 m³ An⁃ shan-type shaft furnace，the influence of air-coal ratio, air volume of smoker and seal of shaft furnace on O₂ content in exhaust gas during magnetization roasting was investigated by single factor test. The experimental results showed that in the process of magnetization roasting, only when the combustion chamber tempera⁃ ture reaches a certain temperature (about 700 ℃) can the combustion-supporting air be increased to make the gas fully burn, otherwise, only increasing the amount of combustion-supporting air can only reduce the CO in the exhaust gas, but it can not make it fully burn. On the contrary, it will lead to an increase in O2 content in exhaust gas by increasing combustion-supporting air. In addition, the results of single factor test also showed that the air volume of smoker and the sealing performance of shaft furnace are also the key fac⁃ tors affecting the O₂ content in exhaust gas.

Key words: Anshan-type shaft furnace, magnetized roasting, content of O₂ in exhaust gas, dust concen? tration