Method for 14-kind rare earth element simultaneous enrichment in rare earth sulfuric acid calcined ore

The invention provides a method for 14-kind rare earth element simultaneous enrichment in a rare earth sulfuric acid calcined ore and belongs to the field of rare earth enrichment. According to the method, N,N,N',N'-four octyl-3-oxygen glutaramide with the abbreviation being TODGA serves as an extraction agent, coal oil serves as a thinner, through solubility characteristics of rare earth elements under different extraction acidities, extraction agent concentrations, extraction volume ratios and extraction times, in a liquid-liquid extraction mode, 14-kind rare earth ion simultaneous enrichment in the rare earth sulfuric acid calcined ore is achieved. According to the method provided by the invention, simultaneous enrichment of 14-kind rare earth elements, including lanthanum, cerium, praseodymium, neodymium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutecium and yttrium, in the rare earth sulfuric acid calcined ore can be achieved, operation is easy and practical, the number of needed separated equipment is small, and the equipment is not prone to being corroded, the method is suitable for sulfuric acid environments needed by industrial production, the medicine using quantity and needed energy consumption are greatly reduced, the TODGA can be recycled, liquid waste is free from pollution, emission is reduced, and the method meets environmentally-friendly requirements.