Abstract: Solidificationstabilization technology is the most important method to deal with heavy metals at present.Solidified materials is the key of this technology.In order to overcome the properties and costs defects of traditional solidified materials,arge quality of industry slag are used as main raw materials to prepare slag based cementitious materials,to solidify heavy metals in leadzinc tailings,and the strength of the solidified body and the effect of leadzinc ion solidification stabilization are investigated.The results show that the strength of slag based cemented leadzinc tailings at 28 d and 60 d reaches 6.40 MPa and 6.44 MPa,which meets the strength requirements of mine filling and mining.The leaching concentration of heavy metal lead is 0.012 mg/L(28 d) and 0.010 mg/L(60 d),which meets the limit value of heavy metal standard in class IV water in environmental quality standard for surface water (GB 3838—2002).The slag based cementitious material solidifies and stabilizes the heavy metal tailings,realizes the "waste treatment",and has a broad application prospect.

Key words: Solidification stabilization, Cementitious materials, Heavy metals, Tailings