Abstract：The chromium in AOD stainless steel slag mainly exists in the trivalent state,but it will be oxidized and released into the environment in the hexavalent state under certain conditions,causing ecological damage. The AOD slag was the research object,and the long-term dynamic leaching experiment method was used to study the influence of leaching atmosphere on the dynamic leaching characteristics of Cr in AOD slag. The results showed that the leaching atmosphere had a significant effect on the redox potential (Eh) of the leachate,and the Eh value under the air atmosphere was significantly higher than the nitrogen atmosphere after 20 d of leaching; the leaching atmosphere had a certain influence on the leachability of Cr. The dissolved oxygen in the initial leaching solution in the air atmosphere could promote the leaching of chromium. In the early stage of leaching,the chromium in the leachate was mainly Cr3+,and in the late stage,the oxidation function of dissolved oxygen from the air atmosphere started to work, and more Cr6+appeared in the leachate. The air atmosphere promoted the dissolution of Cr at a faster rate than the nitrogen atmosphere. When the leaching progressed to the 44.6 d,the cumulative dissolution ratio of Cr3+ reached 5.71%,Cr6+ reached 3.70%,and the total Cr reached 9.41%. The chromium in the AOD slag had a continuous leaching ability,so its leaching toxicity cannot be ignored.
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