Spent pot-lining (SPL) and red mud (RM) are the two major solid wastes of the aluminum industry. In this study, an innovative method has been proposed for co-treatment of SPL and RM to reuse carbon and recover metal (iron, aluminum and sodium) by a reductive roasting-leaching-magnetic separation process (RRLMS process). Moreover, the transformation behaviors of fluoride, cyanide and sulfur present in these residues were studied. The effects of parameters such as temperature, CaO/SiO2 molar ratio, addition amount of SPL, Na2O/Al2O3 molar ratio and roasting time on the result of the process were investigated. Under optimum conditions, the recovery extents of Al2O3 and Na2O were 83.12 and 91.80 pct, respectively. The corresponding leaching extent and loss of F upon roasting process were 16.03 and 35.27 pct, respectively, and only 29.02 pct of ST in the roasted product was leached. Furthermore, reduction extent of 78.65 pct and a metallization extent of 62.83 pct for iron minerals were achieved. The SPL-RM mixture after treatment was rendered non-hazardous. Finally, wet magnetic separation at 1.2 A current (magnetic field strength of approximately 130 mT) provided 30.83 wt pct concentrate yield with 59.09 wt pct total iron concentration and iron recovery extent of 65.25 pct from the leached residue.

中文翻译：

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废锅衬与赤泥协同处理还原焙烧法回收铁、铝、钠的碳再利用

废罐衬 (SPL) 和赤泥 (RM) 是铝工业的两大固体废物。在这项研究中，提出了一种创新方法，用于通过还原焙烧-浸出-磁分离工艺（RRLMS 工艺）共处理 SPL 和 RM，以重新利用碳并回收金属（铁、铝和钠）。此外，研究了这些残留物中存在的氟化物、氰化物和硫的转化行为。考察了温度、CaO/SiO2摩尔比、SPL添加量、Na2O/Al2O3摩尔比和焙烧时间等参数对工艺结果的影响。在最佳条件下，Al2O3和Na2O的回收率分别为83.12%和91.80%。焙烧过程中相应的浸出程度和 F 损失分别为 16.03 和 35.27 pct，仅为 29。浸出焙烧产品中的 02% ST。此外，铁矿物的还原程度达到 78.65%，金属化程度达到 62.83%。处理后的 SPL-RM 混合物变得无害。最后，在 1.2 A 电流（大约 130 mT 的磁场强度）下湿式磁选提供了 30.83 wt pct 的精矿产量，59.09 wt pct 的总铁浓度和 65.25 pct 从浸出残留物中的铁回收率。