AbstractThe sintering behaviors among SiO2, FeS and Fe3O4 were detected to reveal the formation mechanism of Fe2SiO4. The results indicated that the formation mechanism is divided into five steps: (1) migration of O2− induced by S2− under a reducing atmosphere; (2) formation of Fe3O4−β; (3) migration of Fe(II) into a ferrite cluster structure to gain oxygen and form Fe3−xO4; (4) Fe(II) invaded the silicon atomic position and released Si(IV); and (5) formation of the stable structure of Fe2SiO4 through chemical diffusion between cations of Fe(II) and Si(IV). These findings can provide theoretical support for controlling the process of the recovery of valuable metals in copper slag through the combined roasting modification–magnetic separation process.

中文翻译：

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烧结过程固相反应生成铁橄榄石(Fe2SiO4)的机理研究

摘要 通过检测SiO2、FeS和Fe3O4之间的烧结行为，揭示了Fe2SiO4的形成机理。结果表明，形成机制分为五个步骤：（1）还原气氛下S2-诱导O2-迁移；(2) Fe3O4-β的形成；(3) Fe(II)迁移到铁氧体团簇结构中获得氧并形成Fe3-xO4；(4) Fe(II)侵入硅原子位置并释放Si(IV)；(5) 通过 Fe(II) 和 Si(IV) 阳离子之间的化学扩散形成稳定的 Fe2SiO4 结构。这些发现可为控制焙烧改性-磁选联合工艺回收铜渣中的有价金属的过程提供理论支持。