Millions of tons of dust produced in the process of gas cleaning are accumulated in dumps located near metallurgical plants. Such dust contains harmful impurities (Zn, As, Pb, and P), thus its recycling by the agglomeration method can lead to either environmental contamination or furnace damage. Hence, prior separation of iron from the impurities is required to improve the efficiency of the recycling process. Here we propose a new hydrometallurgical scheme for extracting iron in the form Na₃FeF₆ from the liquid phase produced as the result of dust acidic leaching. The ability of Na₃FeF₆ to interact with NaOH (KOH) with the formation of Fe(OH)₃ has been utilized for separating Fe³⁺ ions from F^–. The proposed scheme is relatively simple, quick, and inexpensive, thus allowing its use at metallurgical plants to separate Fe from Zn, As, Pb, and P.

气体净化过程中产生的数百万吨粉尘堆积在冶金厂附近的垃圾场中。此类粉尘含有有害杂质（Zn、As、Pb 和 P），因此通过附聚方法对其进行回收会导致环境污染或熔炉损坏。因此，需要预先将铁与杂质分离以提高回收过程的效率。在这里，我们提出了一种新的湿法冶金方案，用于从粉尘酸性浸出产生的液相中提取 Na ₃ FeF ₆形式的铁。Na ₃ FeF ₆与 NaOH (KOH) 相互作用形成 Fe(OH) _{3 的能力}已被用于分离 Fe ³⁺来自 F ^{- 的}离子。所提出的方案相对简单、快速且价格低廉，因此允许在冶金厂使用它从 Zn、As、Pb 和 P 中分离铁。