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

An extractant and a technology for saponifying extractant, which is applied in the field of online saponification and Ca2+ removal of extractant for rare earth separation, and achieves the effect of simple and continuous saponification process, saving turnover and reducing saponification cost.

Active Publication Date: 2012-11-21
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Method for online saponification and Ca&lt;2+&gt; removal of extracting agent used for rare earth separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to calcium oxide 292 g / min, water 5 liters / min, 1.5mol / L P 507 The feed rate of 20 liters / min of extractant is continuously and evenly fed into the saponification tank, fully stirred for 45 minutes, the saponification temperature is 15° C., and the phase separation in the saponification process is in good condition. clarified good P 507 Extractant, saponification value 0.51mol / L. The saponification extractant directly enters the Ca removal 2+ In the tank, after the exchange reaction with the rare earth material liquid, it contains Ca 2+ The rare earth residual liquid is returned to the saponification tank, and the loaded extractant enters the rare earth separation process. The extractant regenerated by stripping is returned to the saponification tank for saponification.

Embodiment 2

[0030] According to calcium hydroxide 410g / min, 1.5mol / L P 507 Extractant (extractant regenerated through stripping) 20 liters / min, water 3 liters / min feeding rate are given continuously and evenly in the saponification tank, meanwhile, will remove Ca 2+ Ca in the groove 2+ The rare earth residual liquid was led to the saponification tank, fully stirred for 55 minutes, the saponification temperature was 20°C, the phase separation was in good condition during the saponification process, and the saponification value of the extractant was 0.54mol / L. The saponification extractant directly enters the Ca removal 2+ In the tank, after the exchange reaction with the rare earth material liquid, it contains Ca 2+ The rare earth residual liquid is returned to the saponification tank, Ca 2+ Without entering the rare earth product, the loaded extractant enters the rare earth separation process. Return to the saponification tank for saponification after stripping and regeneration.

Embodiment 3

[0032] Feed continuously and evenly into the saponification tank by calcium carbonate 570 g / min, 0.6mol / L naphthenic acid extractant (extractant regenerated through stripping) 20 liters / min, water 4 liters / min, and simultaneously , will remove Ca 2+ Ca in the groove 2+ The rare earth residual liquid was introduced into the saponification tank, fully stirred for 65 minutes, the saponification temperature was 25°C, the phase separation was in good condition during the saponification process, and the saponification value of the extractant was 0.56mol / L. The saponification extractant directly enters the Ca removal 2+ In the tank, after the exchange reaction with the rare earth material liquid, it contains Ca 2+ The rare earth residual liquid is returned to the saponification tank, Ca 2+ Without entering the rare earth product, the loaded extractant enters the rare earth separation process. Return to the saponification tank for saponification after stripping and regeneration. ...

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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+> inthe 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, thusthe 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B59/00
CPCY02P10/20
Inventor 杨新华陈冬英刘柏禄卢能迪欧阳红周洁英彭少华赖兰萍
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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