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在灰铸铁中加入少量合金A或B，同时改善石墨形状及大小可大大提高铸铁蒸发锅在复分解法制取硝盐和氧化铁的工艺过程中的耐蚀性．为这种工艺流程提供了新的铸铁材质的途径．
Adding a small amount of alloy A or B to the gray iron and improving the shape and size of the graphite can greatly improve the corrosion resistance of the cast iron evaporation pot in the process of producing the nitric salt and the iron oxide by the double decomposition method. A new way to cast iron for this process.