Method for online saponification and Ca<2+> removal of extracting agent used for rare earth separation

Abstract

The invention relates to a method for online saponification and Ca<2+> removal of an extracting agent used for rare earth separation. The method comprises the following steps: firstly, adding an extracting agent and a solid saponifier and supplementing water in a saponification reaction tank, and carrying out an online downstream saponification reaction to saponify the extracting agent; and secondly, directly adding the saponified extracting agent into a tank for Ca<2+> removal, and carrying out a reverse flow exchange reaction with a continuously fed rare earth liquid to remove the Ca<2+> in the saponified extracting agent, wherein the remaining rare earth liquid containing Ca<2+> is returned to the saponification tank, and is not fed into the rare earth extraction process; and the loading extracting agent is fed into an extraction separation system and then is returned to the saponification tank for saponification after re-extraction and regeneration, and the extracting agent is subject to self-circulation in a closed loop in the extraction system. In the method, calcium oxide, calvital and calcium carbonate which are low in cost are used as raw materials, not only can the production cost be reduced, but also the pollution of ammonia-nitrogen waste water to the environment isavoided; and an online saponification method of directly adding the solid saponifier is adopted, thus the saponification process can be simple and continuous, and the cycle of the extracting agent and equipment and factories matched with saponification can be saved.

Description

technical field [0001] The invention relates to the on-line saponification and Ca removal of an extractant for rare earth separation 2+ The method, especially relate to a kind of method that carries out on-line saponification by continuously feeding extraction agent, solid saponification agent etc. in saponification tank, and remove Ca 2+ The rare earth material liquid is continuously fed into the tank to remove Ca 2+ Methods. It belongs to the field of hydrometallurgy. Background technique [0002] Usually, acidic extractant is used for the extraction and separation of rare earth, and the extraction process is carried out under low acidity conditions. Generally, to extract a rare earth ion, three H + into the aqueous phase. As the extraction process continues, the aqueous phase H + As the concentration continues to increase, the ability of the extractant to extract rare earths continues to decline, making the extraction process unstable. Therefore, before the extract...

AI Technical Summary

Problems solved by technology

The saponification process is easy to produce a large amount of three-phase, and there are more running, popping, dripping, leaking, and safety hazards

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