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镧和钇是最强的脱氧、脱硫剂,并能形成稳定的氮化物。所有的稀土金属在铸铁中都是石墨球化剂,其中铈、钇和钕效果最好。因此,今后要求对稀土分量镧、铈、钇的分析是摆在分析工作者面前的一项重要工作。稀土硅铁镁合金中,稀土总量的分析,目前多采用氟化容量法,铜试剂分离EDTA络合滴定法、氟电极法、比色法、草酸盐重量法。如果不要求测定分量,上述方法均可采用。由于要求测定稀土分量,我们采用草酸盐重量
Lanthanum and yttrium are the strongest deoxygenation, desulfurization agents, and form stable nitrides. All rare earth metals are graphite nodularizers in cast iron, with cerium, yttrium and neodymium the best. Therefore, the future requirements of the analysis of rare earth elements lanthanum, cerium, yttrium is placed in front of analysts an important task. Rare earth ferrosilicon magnesium alloy, the total amount of rare earth analysis, the current use of fluoride capacity method, the copper reagent separation EDTA complexometric titration, fluoride electrode, colorimetric, oxalate gravimetric method. If you do not require measurement of components, the above methods can be used. Due to the requirement for the determination of rare earth components, we use oxalate weight