废旧阴极-赤泥协同处理烧结熟料的溶出性能

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.

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

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.