废旧阴极-赤泥协同处理烧结熟料的溶出性能

路坊海; 郑凯; 苏向东; 陈肖虎; 黄芳; 王芝成; 谷晓菲; 鄢青松

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中国环境科学 ›› 2020, Vol. 40 ›› Issue (7) : 3037-3043.

固体废物

废旧阴极-赤泥协同处理烧结熟料的溶出性能

路坊海¹, 郑凯^1,2, 苏向东^1,2, 陈肖虎¹, 黄芳¹, 王芝成¹, 谷晓菲¹, 鄢青松³

作者信息 +

Digestion performance of roasted sample produced by co-treatment of spent pot-lining and red mud

LU Fang-hai¹, ZHENG Kai^1,2, SU Xiang-dong^1,2, CHEN Xiao-hu¹, HUANG Fang¹, WANG Zhi-cheng¹, GU Xiao-fei¹, YAN Qing-song³

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文章历史 +

摘要

采用XRF，ICP-MS，XRD及SEM-EDS检测手段，研究了废旧阴极-赤泥高温协同处理所得熟料的溶出性能.结果表明，Na₂CO₃浓度，温度，时间及液固比因素对Al₂O₃，Na₂O溶出率TFe₂O₃的富集效果的影响趋势一致.最适宜溶出条件为：Na₂CO₃ 30g/L，温度50℃，时间30min，液固比8.该条件下，熟料中Al₂O₃和Na₂O溶出率分别高达为87.41%和92.51%；相应的SiO₂和CaO溶出率仅为3.02%和0.36%，铁矿物几乎不溶.溶出渣中的TFe₂O₃含量从熟料中23.64%提高到39.89%，研究表明溶出工艺同步实现了熟料中铝、钠的回收和铁的富集.再者，处理后溶出渣较熟料减量近16%（以铝和钠溶出率测算），且属于非危险性废物.

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.

导出引用

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[J]. China Environmental Science. 2020, 40(7): 3037-3043

中图分类号： X705

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基金

国家自然科学基金资助项目（51664010，51664008）；贵州省高层次创新型人才培养项目（GZSQCC2018002）；贵阳市科技计划项目（筑科合同[2019]10-3号）；贵州省流程性工业新过程工程研究中心（黔教合KY[2017]021号）；贵州理工学院高层次人才科研启动经费项目（XJGC20181010）