掺杂异物铁精粉的鉴别

烧结球团矿作为炼铁生产过程中的主要原料广泛使用经磁选的铁精粉,由于资源、价格、成本等原因,原料市场出现了掺入铁屑、磨床屑、氧化铁皮等异物提高铁精粉中全铁含量的假铁精粉,烧结过程中一旦使用这些假铁精粉,严重影响生产。针对外购进厂铁精粉是否为掺杂异物的铁精粉,通过检查外观特征是否有白色石灰颗粒,通过检查气味是否有臭皮蛋、氨气味道,再通过测定水化后pH值是否呈碱性以及检测铁精粉中的磁性铁和金属铁含量,可以快速简单鉴定该铁精粉是否由铁屑、硫酸渣、氧化铁皮等外来含铁物质配矿而成。

Identification of fine iron powder doped with foreign matter

The sinter pellets are main raw materials in iron making process and they mainly adopt fine iron powder after magnetic separation. Due to the reasons including resource, price and cost, the false fine iron powders appear in the market. Some fine iron powders such as iron chips, grinding machine chips and oxide scale are doped into fine iron powder to increase the total ion content. Once these false fine iron powders are used in sintering process, the production will be seriously affected. The purchased fine iron powder was identified according to the following items: the appearance features were examined to check whether there were white lime particles; whether there was the odor of smelly preserved egg and ammonia was checked; whether the material was alkaline or not was examined by pH after hydration; the content of magnetic iron and metal iron in fine iron powder was determined. The proposed method could be used to rapidly and simply indentify whether the fine iron powder sample was composed of iron-containing foreign matters such as iron scraps, sulfuric acid residue and oxide scale.