氯化稀土是大宗产品。每年投入世界市场的数量以万吨计。国内一般采用减压浓缩的方式生产,即将其溶液在一定的真空度下蒸浓,再冷凝成产品。产品分为REO≥45%和≥48%两级,按Eu_2O_3/REO值论价。为了合理地控制工艺过程和产品品位,测 Rare earth chloride is a bulk product. The annual volume put into the world market is 10,000 tons. China generally use vacuum concentration of the way to produce, about its solution in a certain degree of vacuum evaporation, and then condensed into products. Products are divided into REO ≥ 45% and ≥ 48% two levels, according to Eu_2O_3 / REO value argument. In order to reasonably control the process and product quality, measurement