Method and device for efficiently absorbing and reducing selenium by sulfurization roasting of copper anode slime

The invention relates to the technical field of non-ferrous metal metallurgy, and discloses a method and a device for efficiently absorbing and reducing selenium by sulfurization roasting of copper anode slime. Copper anode slime and concentrated sulfuric acid are pulped, then introduced into a rotary kiln, and roasted; and selenium is efficiently absorbed and reduced from selenium-containing roasting flue gas by controlling the negative pressure of the rotary kiln and the temperature of stepped four-section roasting and controlling the temperature, acidity, reduction potential and the like ofabsorption liquid. The method has the advantages of simple operation, high production controllability, and effective control of the production process conditions. The temperature and the acidity of the absorption liquid are optimal all the time, the direct recovery rate of selenium reaches 99.8% or above, the utilization rate of SO2 in the roasting flue gas is improved, the content of SO2 in tailgas is greatly reduced, t