Digestion performance of roasted sample produced by co-treatment of spent pot-lining and red mud
LU Fang-hai1, ZHENG Kai1,2, SU Xiang-dong1,2, CHEN Xiao-hu1, HUANG Fang1, WANG Zhi-cheng1, GU Xiao-fei1, YAN Qing-song3
1. School of Materials Science and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang 550003, China; 2. Key Laboratory of Light Metal Materials Processing of Guizhou Province, Guizhou Institute of Technology, Guiyang 550003, China; 3. Guizhou Yi Wei De Environmental Protection Technology Development Co., Ltd, Qingzhen 551400, China
Abstract：The digestion performance of roasted sample produced by co-treatment of spent pot-lining and red mud at high temperature were studied using XRF, ICP-MS, XRD and SEM-EDS. The experimental results showed that the influences of alkali concentration (Na2CO3), temperature, digestion duration and liquid-solid ratio on the digestion rates of Al2O3 and Na2O and the enrichment of TFe2O3 were consistent. The optimal digestion conditions were below:Na2CO3 30g/L, temperature 50℃, time 30min, liquid-solid ratio 8. Under these conditions, the digestion rates of Al2O3 and Na2O in the roasted sample were 87.41% and 92.51% respectively; while only 3.02% of SiO2 and 0.36% of CaO were digested, and iron minerals were almost indissoluble in alkaline solution. The content of TFe2O3 increased to 39.89% in the digested residue from 23.64% in the roasted sample. The results showed that the efficiently recovery of aluminum, sodium and the enrichment of iron from the roasted sample were achieved simultaneously by the digestion process. Moreover, compared with the roasted sample, the amount of digested residue was reduced by nearly 16% (evaluated based on the digestion rates of Al2O3 and Na2O), and it was non-hazardous.
路坊海, 郑凯, 苏向东, 陈肖虎, 黄芳, 王芝成, 谷晓菲, 鄢青松. 废旧阴极-赤泥协同处理烧结熟料的溶出性能[J]. 中国环境科学, 2020, 40(7): 3037-3043.
LU Fang-hai, ZHENG Kai, SU Xiang-dong, CHEN Xiao-hu, HUANG Fang, WANG Zhi-cheng, GU Xiao-fei, YAN Qing-song. Digestion performance of roasted sample produced by co-treatment of spent pot-lining and red mud. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 3037-3043.
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