A new process for preparing rare earth ore from rare earth ore, comprising concentrated sulfuric acid roasting, hot water leaching, iron removal and neutralization acid, and one-step extraction with HDEHP, and stepwise stripping with HCl, characterized by The iron removal and neutralization acid are the stepwise operation of neutralizing the acid after the iron removal, and the iron removal and neutralization acid are passed.
(1) In the first 40 or 70% (weight percent) bis (2-ethylhexyl) phosphoric acid with HDEHP (remainder sulfonated coal oil) = 2 in the phase comparison compared i.e. organic water, or 1: 1 The extraction order is 3 or 10 conditions respectively (note: the high HDEHP concentration corresponds to the low number, the low concentration corresponds to the high number), and the extract is subjected to extraction and iron removal, followed by 4 mol/L HCl in the organic phase compared to the water phase = 1: 2. The stripping of Fe and HDEHP extracts is carried out under the condition of 7 or 10 stripping stages to recover HDEHP for recycling;
(2) further containing 70% (by weight) tributyl phosphate TBP (the rest is liquid paraffin and sulfonated kerosene) in the organic phase compared to the aqueous phase = 1:1, the extraction series is 3, the content of Fe 4 mol/L HCl stripping solution was subjected to extraction and iron removal and 4 mol/L HCl was recovered for reuse, and then subjected to homogeneous membrane diffusion method from the residual solution containing 1 to 1.5 mol/L of H↓[2]SO↓[4] rare earth. The obtained H ↓ [2] SO ↓ [4] is formulated into 0.1 mol / L H ↓ [2] SO ↓ [4] as a stripping agent, in the organic phase compared to the water phase = 1: 1, the number of stripping stages is 3 Under the conditions of the conditions, the extract containing Fe and TBP is stripped, and the TBP is prepared for recycling, and the Fe ↓ [2] (SO↓[4]) ↓ [3] for preparing ultrafine iron powder is obtained. ;
(3) Finally, the rare earth liquid containing 0.3-0.5 mol/L H↓[2]SO↓[4] is neutralized with MgO to a pH of 3 to 4; the one-step extraction with HDEHP and the reverse reaction with HCl The extraction process conditions are: when the feed liquid contains RE ↓ [2] (SO ↓ [4]) ↓ [3] is 20 ~ 26g / L, 70% HDEHP (the rest is sulfonated kerosene) in organic compared to water Phase = 3:1, extraction was carried out under the conditions of 8 grades, and then stripped with 0.8 mol/L HCl in the organic phase compared to the aqueous phase = 1:1, and the stripping grade was 20, and La, Mixed rare earth chlorides such as Cl and Nd are back-extracted with 4 or 6 mol/L HCl in the organic phase compared with the aqueous phase = 1:1, and the stripping grade is 10 or 3, and the mixed rare earth chlorines such as Sm, Eu and Gd are obtained. Compound.
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