Abstract:The effects of addition of rotary kiln slag of zinc smelting used for cement concrete gelled material on compressive strength of concrete and leaching of heavy metal ions were investigated. The results show that concrete strength first raises then drops with increasing amount of rotary kiln slag. Compressive strength of 28 days of concrete curing block reaches 36.5 MPa at maximum upon mix proportion of rotary kiln slag and gelled material of 11%. Compressive strength drops rapidly after mix proportion is 13% above. Cement concrete has a strong curing ability for cadmium, lead and other heavy metal ions of rotary kiln slag, and particularly has stronger effect on cadmium than on lead. Under test conditions, toxic leaching concentration of cadmium and lead is 0.258~0.276 μg/mL and 1.541~1.835 μg/mL respectively, far below the national standard limit of concentration of hazardous waste leaching toxicity identification.