This work deals with the recovered carbon black derived from the industrial-scale pyrolysis of end-of-life tires, targeting at increasing the technical knowledge to be considered as alternative to the virgin carbon black. Accordingly, a demineralization process using HCl, HNO₃ and NaOH to improve the properties of the recovered carbon black is investigated. A fractional factorial design 2^k-2 showed that the acid concentration has the highest statistical influence on the ash reduction. At 5 M, the ash content was 6.12 wt% and 5.21 wt% for HCl and HNO₃, respectively. The demineralized recovered carbon black obtained from both acids together with a reference carbon black (N550) were characterized by elemental and proximate analyses, surface area, ash composition by XRF, and morphology by SEM and TEM. A comprehensive surface chemistry analysis by FTIR and TPD-NH₃ was also conducted. In addition to decreasing the ash content and to increasing the surface area, the recovered carbon black treated with HNO₃ led to the highest presence of acidic functional groups. In this regard, this upgraded recovered carbon black is expected to offer both better filler/polymer interaction and in-rubber performance, as compared to the non-treated recovered carbon black. The experience gained from this work provides important impetus to deem the recovered carbon black as alternative to virgin carbon black, and paves the way to close the end-of-life tire-recycling loop by both pyrolysis and chemical upgrading strategies.

这项工作涉及从报废轮胎的工业规模热解获得的回收炭黑，其目标是增加被认为可以替代原始炭黑的技术知识。因此，研究了使用HCl，HNO ₃和NaOH的脱盐方法，以改善回收的炭黑的性能。分数阶乘设计2 ^k-2表明酸浓度对减少灰分具有最高的统计影响。在5 M时，灰分含量为6.12 wt％，而HCl和HNO ₃为5.21 wt％， 分别。由两种酸与参比炭黑（N550）一起获得的脱盐回收炭黑的特征在于元素分析和近似分析，表面积，XRF灰分组成以及SEM和TEM形貌。还通过FTIR和TPD-NH ₃进行了全面的表面化学分析。除了减少灰分和增加表面积外，用HNO ₃处理的回收炭黑导致酸性官能团的含量最高。在这方面，与未处理的回收炭黑相比，这种升级的回收炭黑有望提供更好的填料/聚合物相互作用和橡胶内性能。从这项工作中获得的经验为将回收的炭黑视为原始炭黑的替代方法提供了重要的动力，并通过热解和化学升级策略为封闭报废轮胎循环回路铺平了道路。