Method for purifying and regenerating P204 and P507 extraction agents

An extraction agent and extraction technology, applied in the direction of improving process efficiency, etc., can solve problems affecting ecology, hazardous waste treatment and pollution of the environment, and achieve the effects of saving production costs, simple treatment process, and low regeneration cost

Inactive Publication Date: 2020-12-11
ZHEJIANG TIANNENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an effective and systematic method for purifying and regenerating P204 and P507 extractants to solve the problem that aging P204 and P507 extractants cannot be used and treated as hazardous waste to pollute the environment and affect ecology

Method used

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  • Method for purifying and regenerating P204 and P507 extraction agents

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Experimental program
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Effect test

Embodiment 1

[0029] On-site confirmation that the extraction line to be processed has been stopped, and all feed valves have been closed; the stirring of the production line is normally turned on, the inlet of the clarification section on the extraction tank on the extraction section and the water seal of the mixing chamber are opened, and the inlet of the pneumatic diaphragm pump is inserted into the organic phase; the diaphragm pump The outlet is placed in the first two stages of the washing section; the washing acid pump is turned on, and the flow rate is appropriately increased to ensure that the metals in the organic phase are completely stripped; the stripped organic phase is driven into the organic solvent storage tank; the stripped acid is new Prepared 6.0mol / L hydrochloric acid.

[0030] After extracting the extractant in the extraction section and the washing section in sequence, the washing acid pump is turned off; the organic phase to be treated on the production line has all go...

Embodiment 2

[0034] On-site confirmation that the extraction line to be processed has been shut down, and all feed valves have been closed.

[0035] The production line is stirred and opened normally, and the inlet of the clarification section on the extraction tank on the extraction section and the water seal of the mixing chamber are opened, and the inlet of the pneumatic diaphragm pump is inserted into the organic phase; the outlet of the diaphragm pump is placed in the first two stages of the washing section; Increase the flow rate to ensure that the metals in the organic phase are completely stripped; back-extraction acid, the normal flow of washing water is turned on; the organic phase of the extraction section is driven to the organic solvent storage tank step by step; the stripping acid is newly prepared 8.0mol / L of hydrochloric acid.

[0036] After the extractants in the extraction section and the washing section are exhausted in sequence, the washing acid pump is turned off. The...

Embodiment 3

[0041] On-site confirmation that the extraction line to be processed has been shut down, and all feed valves have been closed.

[0042] The production line is stirred and opened normally, and the inlet of the clarification section on the extraction tank on the extraction section and the water seal of the mixing chamber are opened, and the inlet of the pneumatic diaphragm pump is inserted into the organic phase; the outlet of the diaphragm pump is placed in the first two stages of the washing section; Increase the flow rate to ensure that the metals in the organic phase are completely stripped; back-extraction acid, the normal flow of washing water is turned on; the organic phase of the extraction section is driven to the organic solvent storage tank step by step; the stripping acid is newly prepared 7.0mol / L of hydrochloric acid.

[0043] After extracting the extractant in the extraction section and the washing section in sequence, the washing acid pump is turned off; and then...

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Abstract

The invention relates to a method for purifying and regenerating P204 and P507 extraction agents. The method comprises the following steps: collecting the P204 and P507 extraction agents on a production line to an anti-ferro section, performing reverse extraction by using 6.0-8 mol / L hydrochloric acid, and enabling the treated P204 and P507 extraction agents to flow into a storage tank; pumping apretreated organic solution into a reaction tank, adding a 10% oxalic acid solution, carrying out stirring at room temperature for 30 minutes, stopping stirring, leaving the solution standstill for layering, and then discharging a water phase, wherein the volume ratio of the oxalic acid solution to the pretreated organic solution is 10: 1; after the treated extraction agent is clarified and does not contain the water phase, pumping the treated extraction agent into a stirring reaction storage tank, and adding activated clay of which the weight volume ratio is 1%; carrying out stirring at roomtemperature for 10 minutes, and immediately pumping the stirred material into a filter press for filter pressing operation; and returning the filtered and clarified organic solution to the reverse extraction section on the extraction line for production and use. According to the purification and regeneration method disclosed by the invention, the extraction agents can be continuously treated on line, so that the extraction agents always keep excellent extraction and reverse extraction performance and phase splitting performance, and the circumstance that the performance is reduced and production is influenced due to long-time use of the extraction agents is avoided.

Description

technical field [0001] The technical field of the invention is solvent extraction, and specifically relates to a method for purifying and regenerating P204 and P507 extractants by adding hydrochloric acid back-extraction, oxalic acid back-extraction and active clay adsorption filtration. Background technique [0002] P204 and P507 are common organic phosphoric acid extractants used in the metallurgical industry. P204 is commonly called di(2-ethylhexyl)phosphonic acid in the field of extraction. It was used for uranium extraction in the early days, and later it has many applications in rare earth and non-ferrous metallurgy. It is generally called P204 in China, and D2EHPA or DEHPA in foreign countries. P507 is called 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester, which is mainly used in rare earth, cobalt and nickel industries. These two extractants are usually added with sulfonated kerosene as a diluent during actual use. It is used repeatedly between extraction and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38
CPCC22B3/3844C22B3/3846Y02P10/20
Inventor 邱璨许博聪李斌詹稳甄爱钢钱舜尧李叶朱美玲张文涛
Owner ZHEJIANG TIANNENG NEW MATERIAL CO LTD
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