一、序言过去,我厂生产球墨铸铁制品时,采用的是开放式无压力加镁处理球铁的工艺方法。该法不仅使镁的损失率高达85%以上,而且产生大量硫化镁(MgS)烟尘,严重污染环境,危害人们的身体健康。尤其是采用这样处理的球铁内部,容易产生“黑斑”,导致产品质量下降。例如,我厂生产的球铁轧辊,由于存在这种“黑 First, the preamble In the past, I plant the production of ductile iron products, using an open pressure-free magnesium processing ductile iron process. The method not only makes the loss rate of magnesium up to 85%, but also produces a large amount of magnesium sulphate (MgS) dust, seriously pollutes the environment and endangers people’s health. In particular, the ductile iron used in this way is prone to “dark spots”, resulting in a decrease in product quality. For example, I produced ductile iron roll, because of the existence of such "black