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精炼高碳锰铁时产生的炉渣一般含有20—30％的锰。过去,为了回收这部分锰曾试验了儿种方法。但是,这些方法存在许多问题:即熔渣中的热能得不到利用,锰的固收率低等。日本电工公司开发的气体和粉剂喷吹工艺解决了这些问题。该工艺将硅铁或金属硅添加到包里的熔渣中,通过浸埋在渣中的喷枪高流量地吹入高纯氮气或某种其他惰性气体进行搅拌,通立热反应生产硅锰。日本电工公司德岛厂利用这种工艺由熔融锰渣直接生产低磷和低碳的硅锰合金。
The slag produced when refining high-carbon ferromanganese generally contains 20-30% manganese. In the past, a variety of methods have been tested for the recovery of this portion of manganese. However, there are many problems with these methods: the thermal energy in the slag is not utilized and the manganese has a low solid content. Gas and powder injection processes developed by NEC solve these problems. The process adds ferrosilicon or silicon metal into the slag in the bag, and blows high-purity nitrogen gas or some other inert gas into the slag through a high-pressure spray gun immersed in the slag to generate thermal reaction to produce silicomanganese. Tokushima plant of Japan’s electrician company using this technology from the direct production of molten manganese slag low phosphorus and low carbon silicon manganese alloy.