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《Environmental Science & Technology》 2013-S1
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Short-term Leaching Characteristics of Chromium in the AOD Slag

ZHENG Na,LI Jun-guo,WANG Ya-jun(School of Metallurgy and Energy,Hebei United University,Tangshan 063009,China)  
Based on solid waste leaching toxicity testing standards,using static test method to research the influence of leaching time,solid-liquid ratio,dissolved oxygen and initial pH value of solution on the short-term Cr leaching in AOD slag.The results indicated that the pH value of the leaching solution is rapidly increased,but E and DO are rapidly decreased by AOD slag;there are two phases of the leaching of Cr,namely fast leaching and slow leaching,the leaching of Cr reaches basic equilibrium within 24 h.Although the effect of solid-liquid ratio on the Cr3+ concentration in AOD slag leaching solution was less,solid waste leaching toxicity testing standards will underestimate the amount of leaching of Cr and its toxic due to the balance between the Cr3+ and OH-reaction;the influence of dissolved oxygen on the leaching Cr is relatively small in short-term leaching process;compared with neutral leaching solution,alkaline leaching solution has less effect on the leaching of Cr in AOD slag;under acid conditions,extending leaching time and reducing the initial pH value of the solution will significantly increase the concentration of the leaching solution of Cr3+.Therefore,the evaluation of neutral leaching solution for toxicity of Cr leaching in AOD slag will remarkably underestimate Cr leaching toxicity.
【Fund】: 国家自然科学基金项目(2008CB617602)
【CateGory Index】: X53
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