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| Beneficial Reuse of EAF Slag and Its Leaching Behavior of Cr |
| WEI Dai-xiu1,XU An-jun1,HE Dong-feng1,TIAN Nai-yuan1,YANG Quan2 |
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
2. Shandong Metallurgical Science Research Institute, Ji’nan 250014, Shandong, China |
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Abstract The structure and properties of EAF slag and it’s leaching behavior of Cr were studied. The results indicate that the main minerals in the EAF slag are Ca2SiO4, Ca3Mg(SiO4)2 and MgCr2O4. The content of Cr2O3 in EAF slag is 2.92%.The slag are suitable for beneficial reuse, but metals in EAF slag are distributed evenly among every particle size. The leaching tests of Cr in slag show that the ratio of Cr leaching rate from slag in deionized water was inversely-proportional to particle size, and directly proportional to leaching time and liquid to solid ratio. Electromagnetic stirring improve the kinetic condition and improve Cr leaching rate. In deionized water, the percentage of Cr(Ⅵ) is higher than 50% in all the Cr leached from EAF slag. In acid solution, the volume of Cr leaching from slag increases but all the Cr are in the form of Cr（Ⅲ）.
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Received: 13 December 2011
Published: 30 October 2012
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2012, Vol. 47 
