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Method for separating scandium from thorium in organic phase by means of back extraction

An organic phase and extraction technology, applied in the direction of improving process efficiency, can solve the problems of high separation cost, complex process, inconvenient process connection, etc., and achieve the effect of short process flow, low separation cost and good separation effect

Inactive Publication Date: 2013-09-18
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this process method is that the process is complicated, and nitric acid must be used to transform hydrochloric acid and sulfuric acid medium into nitric acid medium, which brings inconvenience in process connection; using nitric acid as the extraction medium, the consumption of nitric acid is large, and the generation of nitrate waste liquid is harmful to the environment. The pollution of the extraction agent P350 is not conducive to environmental protection; the extraction capacity of the extraction agent P350 is small, the phase separation time is long, and the efficiency of the separation process is low; the extraction agent P350 is easy to emulsify, and the stability of the separation process is poor; the traditional P350 extraction and separation process of scandium and thorium The separation cost of the method is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Back extraction of thorium

[0018] Take 100 L of 1.0 M P204 organic phase loaded with 0.225 g / L scandium and 0.580 g / L thorium, 50 L of 5 g / L sodium bifluoride aqueous solution, and the volume ratio of stripping agent to organic phase is 1:2, at 25 °C Mixing under the hood, after fully stirring and mixing for 6 minutes, stand still for 10 minutes, and separate the organic phase and the aqueous phase after phase separation. After stripping and phase separation, the organic phase that has been stripped of thorium is used to recover scandium; the aqueous phase obtained by stripping thorium is used to recover thorium.

[0019] (2) filter

[0020] The aqueous phase containing thorium fluoride precipitate is filtered, and the precipitate is washed to obtain thorium fluoride; the filtrate can be recycled as a stripping agent.

[0021] (3) Recycling of stripping agent

[0022] Add sodium bifluoride to the filtrate at a rate of 0.620 g / L, stir until the sodium bifluoride...

Embodiment 2

[0024] (1) Back extraction of thorium

[0025] Take 100 L of 0.2 M P204 organic phase loaded with 0.150 g / L scandium and 0.174 g / L thorium, 100 L of 1 g / L sodium bifluoride aqueous solution, and the volume ratio of stripping agent to organic phase is 1:1, at 35 °C Mixing under the hood, after fully stirring and mixing for 3 minutes, stand still for 10 minutes, and separate the organic phase and the aqueous phase after phase separation. After stripping and phase separation, the organic phase that has been stripped of thorium is used to recover scandium; the aqueous phase obtained by stripping thorium is used to recover thorium.

[0026] (2) filter

[0027] The aqueous phase containing thorium fluoride precipitate is filtered, and the precipitate is washed to obtain thorium fluoride; the filtrate can be recycled as a stripping agent.

[0028] (3) Recycling of stripping agent

[0029] In the filtrate, add sodium hydrogen fluoride at a rate of 0.123 g / L, stir until the sodium h...

Embodiment 3

[0031] (1) Back extraction of thorium

[0032] Take 100 L of 1.5 M P204 organic phase loaded with 0.450 g / L scandium and 0.986 g / L thorium, 10 L of 20 g / L ammonium bifluoride aqueous solution, and the volume ratio of stripping agent to organic phase is 1:10, at 25 °C Mix at lower speed, fully stir and mix for 20 minutes, stand still for 20 minutes, and separate the organic phase and the water phase after phase separation. After stripping and phase separation, the organic phase that has been stripped of thorium is used to recover scandium; the aqueous phase obtained by stripping thorium is used to recover thorium.

[0033] (2) filter

[0034] The aqueous phase containing thorium fluoride precipitate is filtered, and the precipitate is washed to obtain thorium fluoride; the filtrate can be recycled as a stripping agent.

[0035] (3) Recycling of stripping agent

[0036] In the filtrate, add ammonium bifluoride at a rate of 4.85 g / L, stir until the ammonium bifluoride is compl...

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PUM

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Abstract

The invention discloses a method for separating scandium from thorium in an organic phase by means of back extraction. The acid phosphor extraction agent organic phase loaded with the scandium and the thorium, is back-extracted by using a fluorinion containing aqueous solution as a back-extraction agent. The method comprises the following steps of: back-extracting the thorium: adding the water-soluble fluoride containing back-extraction agent into an extraction apparatus filled with the scandium and thorium loaded organic phase, wherein the water phase obtained from the back extraction of the thorium is applied to recycling the thorium; (2) filtering: filtering the water phase containing thorium fluoride sediment, wherein the sediment is the thorium fluoride; (3) recycling the back-extraction agent: supplementing proper water-soluble fluoride into a filtrating solution, and applying the resulting filtrating solution to the back extraction of the thorium to achieve the recycling of the back-extraction agent. The method disclosed by the invention has the following advantages: the separation of the scandium from the thorium is achieved by selective back extraction of the thorium directly from the acid phosphor extraction organic phase loaded with the scandium and the thorium; the method is short in process flow, and good in separation effect; the back extraction agent can be recycled, causes no pollution, and is low in separation cost.

Description

technical field [0001] The invention relates to a method for separating scandium and thorium, in particular to a method for stripping and separating scandium and thorium in an organic phase. Background technique [0002] Scandium and thorium are extremely important strategic materials. Scandium and thorium are usually associated together and are one of the most difficult element pairs to separate. To prepare pure scandium, the separation of scandium and thorium must be solved. The existing common method for separating scandium and thorium is the extraction and separation method of dimethyl heptyl methyl phosphate (trade name P350). [0003] Extracting scandium from various raw materials, acidic phosphorus extractant is a commonly used type of extractant. In the traditional process for extracting scandium, acidic phosphorus-based extractants are used to extract scandium and thorium into the organic phase, separating them from many other metal ions. However, sodium hydroxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B60/02C22B3/40
CPCY02P10/20
Inventor 钟学明秦元成周丹
Owner NANCHANG HANGKONG UNIVERSITY
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