Lijiu Cheng et al reported extracting scandium from the rare earth ores, to NaCl or NH 4 Cl scandium leaching from the mother liquor, pH 3 to 4, and extracted naphthenate, rare earth ions extracted into the organic phase, while leaving the scandium raffinate. However, Zhang Yi studied in detail the extraction of various rare earth elements by naphthenic acid, which indicated that the extraction started at pH 2.20, and the extraction was completed at pH 3.3. The pH 1/2 was only 2.84, which was smaller than other rare earth elements. The extraction order of various rare earth ions is Sc>Eu>Gd>Yb>Nd>Y>La, which is different from the extraction sequence given by Li Jiucheng ΣCe>ΣY>Sc. Yan Chunhua the like to HA-ROH- coal oil system, with a three-step cross-flow extraction obtained from only 0.04% of scandium-containing material of a rare earth-rich liquid by fractional scandium (containing about 15 ~ 30% Sc), crude scandium (Sc³99%) And high purity cerium oxide (Sc 2 O 3 /REO 399.999%), the total extraction yield is greater than 90%.
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