The present study aimed to investigate reduction behavior of Bi₂O₃ in the gaseous atmosphere generated by the pyrolysis of waste tires. Thermodynamic analysis carried out in the Bi-O-C-H-S-Ar system predicted that Bi₂O₃ could be reduced to Bi in the temperature range 700–900 K. Bi₂O₃ reduction experiments were carried out as a function of reactant mass ratio (\( m_{\text{tire}} /m_{{{\text{Bi}}_{ 2} {\text{O}}_{ 3} }} \) = 0–10) and temperature (600–900 K). The extent of tire pyrolysis increased as the temperature was raised to 900 K. The degree of Bi₂O₃ reduction increased with increasing tire pyrolysis, while the waste pyrolysis process controlled Bi₂O₃ reduction. The oxide reduction was incomplete, when only waste tires were used. Adding a minor amount of waste high-density polyethylene to the tires sufficed for full Bi₂O₃ reduction at 900 K. The reduction reactions and a model for the morphological evolution are presented. Large Bi shots formed owing to the coalescence of the liquid Bi droplets at the reduction temperature.

本研究旨在研究废轮胎热解产生的气态气氛中Bi ₂ O _3的还原行为。热力学分析中预测，碧碧OCHS-AR系统进行₂ ö ₃可在温度范围700-900 K.毕减少到的Bi ₂ ö ₃还原进行实验作为反应物的质量比的函数（\ （m _ {\ text {tire}} / m _ {{{\ text {Bi}} _ {2} {\ text {O}} _ {3}}} \）  = 0–10）和温度（600–900 K）。轮胎热解程度随温度升高至900 K而增加。Bi ₂ O ₃的程度随着轮胎热解的增加，还原率增加，而废物热解过程控制Bi ₂ O ₃还原。当仅使用废轮胎时，氧化物还原不完全。向足以在900 K下完全还原Bi ₂ O ₃的轮胎中添加少量的废旧高密度聚乙烯。提出了还原反应和形态演变模型。由于在还原温度下液态Bi液滴的聚结，形成了较大的Bi喷丸。