Abstract:From perspective of leaching mechanism and migration diffusion, acid generation potential, extraction toxicity of ferro-nickel slag and extraction toxicity(ET) of concrete products were studied. The results show that acid generation potential of ferro-nickel slag is non acid, which is not an acid emission source. Corrosion and ET are less than the limited value of national standard. In acid and alkaline environment, arsenic is leached from ferro-nickel slag concrete products, amount of which is less than standard for groundwater quality. The environmental risk of ferro-nickel slag is small, which can be directly used as one admixtures in concrete.