Abstract: The ultralow emission of industrial flue gas has brought about a sharp increase in the types and quantities of byproducts of gas cleaning system.However,it brings about difficults of recover and utility the byproducts effectively.Based on the component analysis of the haydite,precipitator dust,used as the pottery component,and expired activated coke,used as the gas component,were mixed with clay for a suitable ratio of raw materials.The L9（33）orthogonal experiment model was selected in the firing process of ceramsite.The results showed that the optimum proportion was 41.7%～45.5% of clay,4.5%～8.3% of expired activated coke and 50.0% of precipitator dust in quality,and the optimum roasting system was drying at 100 ℃ for 30 minutes,preheating at 400 ℃ for 15 minutes,roasting at 1 150 ℃ for 15 minutes,and natural cooling.The bulk density,cylindrical compress strength,water absorption in 1h and leaching concentration of heavy metal of the fired ceramsite all met the national standards.

Key words: gas cleaning, ceramsite, precipitator dust, activated coke, orthogonal experiment