A roasting-leaching process has been developed for concentrating platinum group metals (PGM) from a PGM-containing ferroalloy. The optimized roasting conditions used a NaOH-to-ferroalloy mass ratio of 1.2 at 600 °C for 2 h. The roasted product mainly comprised Na₄SiO₄, NaFeO₂ and Fe₂O₃. The iron oxide and sodium silicate associated with the roasted product were leached in water and dilute sulfuric acid solution, while the PGM was concentrated in the acid-leached residue. A PGM concentration of 23.4% was obtained with assaying, and the concentration factor of PGM from the ferroalloy to PGM concentration was greater than 9.

中文翻译：

---

通过焙烧浸出工艺从含 PGM 的铁合金中浓缩 PGM

已经开发出一种用于从含铂族金属的铁合金中浓缩铂族金属 (PGM) 的焙烧-浸出工艺。优化的焙烧条件使用 NaOH 与铁合金的质量比为 1.2，在 600 °C 下焙烧 2 小时。焙烧产物主要为Na ₄ SiO ₄、NaFeO ₂和Fe ₂ O ₃。与焙烧产品相关的氧化铁和硅酸钠在水和稀硫酸溶液中浸出，而铂族金属则在酸浸出的残渣中浓缩。测定得到PGM浓度为23.4%，PGM从铁合金到PGM浓度的浓度系数大于9。