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Synergistic extraction agent and method for separating zirconium from hafnium

An extraction agent, the technology of zirconium and hafnium, applied in the field of chemical substances, can solve the problems of large dosage, high cost, and difficult control of the operation process, and achieve the effect of high hafnium extraction rate

Active Publication Date: 2021-04-02
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at present, the above-mentioned extractants are used in a large amount in the separation process of zirconium and hafnium, and the cost is high, and the operation process is not easy to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] This embodiment provides a synergistic extractant for preferentially extracting hafnium and an extraction and separation method for zirconium and hafnium.

[0132] The co-extractant is composed of 12vol% secondary carboamine N1923, 12vol% tributyl phosphate and 76vol% n-hexane diluent.

[0133] Zirconium hafnium extraction separation method, the specific steps are as follows:

[0134] (1) The above-mentioned extractant was mixed with an equal volume of a presaturated solution containing 2.5 mol / L ammonium thiocyanate and 3.0 mol / L hydrochloric acid and stirred for 15 minutes, and the presaturated extractant was obtained after phase separation.

[0135] (2) preparation zirconium ion concentration is 1.2mol / L, hafnium ion concentration is the zirconium hafnium aqueous phase material liquid of 0.020mol / L, and the ammonium thiocyanate concentration is 3.0mol / L in the zirconium hafnium aqueous phase material liquid, and hydrochloric acid concentration is 3.0mol / L, ammonium ...

Embodiment 2

[0140] A method similar to that of Example 1 was used to prepare the extractant and the zirconium and hafnium aqueous phase feed solution.

[0141] Containing 15vol% 1,8-octanediamine, 15vol% dimethylheptyl methylphosphonate and 70vol% diisobutyl ketone diluent in the extractant, the presaturated solution contains 2.5mol / L sodium thiocyanate and 3.0 mol / L hydrochloric acid, the zirconium and hafnium aqueous phase feed solution contains 1.1mol / L zirconium ions, 0.014mol / L hafnium ions, 2.8mol / L sodium thiocyanate, 1.4mol / L sulfuric acid, and 0.8mol / L ammonium chloride.

[0142] The specific operation method is the same as that of Example 1, and the extraction rate of hafnium and zirconium by the extractant is calculated to be 77.9%, and the extraction rate of zirconium is 19.0%, and the separation coefficient of hafnium and zirconium is 15.1.

Embodiment 3

[0144] A method similar to that of Example 1 was used to prepare the extractant and the zirconium and hafnium aqueous phase feed solution.

[0145] The extractant contains 15vol% diisooctylamine, 15vol% trioctylphosphine oxide and 70vol% sulfonated kerosene diluent, the presaturated solution contains 2.5mol / L ammonium thiocyanate and 4.0mol / L hydrochloric acid, zirconium hafnium The aqueous phase feed solution contains 1.0mol / L zirconium ion, 0.018mol / L hafnium ion, 3.0mol / L ammonium thiocyanate, 3.0mol / L hydrochloric acid, 0.4mol / L sulfuric acid, and 0.8mol / L ammonium chloride.

[0146] The specific operation method is the same as that in Example 1, and the extraction rate of hafnium and zirconium by the extractant is calculated to be 88.4%, and the extraction rate of zirconium is 41.1%, and the separation coefficient of hafnium and zirconium is 10.9.

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PUM

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Abstract

The invention discloses a synergistic extraction agent and method for separating zirconium from hafnium, and belongs to the technical field of chemical substance separation. The synergistic extractionagent comprises an alkaline amine extraction agent, a neutral phosphorus-containing extraction agent and a diluent, and can effectively separate zirconium from hafnium under the condition that the use amount of the alkaline amine extraction agent and the use amount of the neutral phosphorus-containing extraction agent are small. A separation reagent comprising the synergistic extraction agent isused for separating a zirconium and hafnium mixture to be separated, a high hafnium extraction rate and a high hafnium and zirconium separation coefficient can be obtained, and the separation efficiency is high.

Description

technical field [0001] The invention relates to the technical field of chemical substances, in particular to a synergistic extraction agent and method for separating zirconium and hafnium. Background technique [0002] Zirconium and hafnium coexist in nature. In the industrial raw materials containing zirconium and hafnium, the mass ratio of zirconium / hafnium is about 100 / 3, that is, more zirconium and less hafnium. At present, the extraction and separation system of zirconium and hafnium includes TBP-HNO 3 system, P204, P507, Cyanex272, Cyanex572 and other organic phosphonic acid extractants, Cyanex301 or Cyanex302 and other thiophosphoric acid extractants, etc. [0003] However, at present, the above-mentioned extractants are used in a large amount in the separation process of zirconium and hafnium, and the cost is high, and the operation process is not easy to control. [0004] In view of this, the present invention is proposed. Contents of the invention [0005] On...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B34/14
CPCC22B34/14Y02P10/20
Inventor 吴明徐志高徐斐董攀飞何正艳瞿军李巧蕾
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES