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Rare earth saponification method of acidic complex extraction organic phase

An organic phase and extraction technology, applied in the direction of improving process efficiency, can solve problems such as poor progress and continued reaction obstacles, and achieve the effects of reduced wastewater discharge and significant environmental and economic benefits

Inactive Publication Date: 2014-08-06
NANCHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the acidic extractants are weak acids or medium-strength acids, which can neutralize the alkaline rare earth compounds, but the direct reaction is not progressing smoothly due to the influence of kinetic factors, and some rare earth extraction complexes will cover the surface of rare earth carbonate hinder the continued response

Method used

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  • Rare earth saponification method of acidic complex extraction organic phase
  • Rare earth saponification method of acidic complex extraction organic phase
  • Rare earth saponification method of acidic complex extraction organic phase

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Experimental program
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Effect test

Embodiment 1

[0026] The 2-ethylhexylphosphonic acid-2-ethylhexyl ester (P507) and sulfonated kerosene used are industrial-grade raw materials, the organic phase and the aqueous phase are prepared according to the set composition, and the set amount of northern rare earth carbonate powder is added and Mix evenly in a 125ml separatory funnel according to the set ratio, and place it in a HY24 speed-regulating multi-purpose oscillator (horizontal oscillation, amplitude: 30mm, vibration frequency: 60-250 times min - 1 ), the extraction time was 4min. Stand still and separate the phases, and use EDTA titration to measure the rare earth concentration in the water phase before and after the water phase extraction C ReO , and calculate the concentration of rare earth extracted in the organic phase and its extraction rate according to the change of rare earth concentration before and after extraction and the volume ratio of the two phases.

[0027] According to the above method, first determine the...

Embodiment 2

[0029] Determination of the amount of solid rare earth carbonate powder added. According to the above results, use 25ml of water phase, the concentration of rare earth is 2.5mmol / l, and the ratio is 1:1. Change the amount of rare earth carbonate powder added, and observe whether the extraction is emulsified and the speed of layering, so as to determine the optimal amount of rare earth added . The result is as Figure 5 , it can be seen from the figure that with the increase of the amount of rare earth carbonate, the extraction rate is higher, and the overall trend is to increase, but when the amount is greater than 1.5g, the extraction rate will decrease, and the phase separation performance will be serious due to the emulsification phenomenon And become worse, because the extraction ability of P507 basically reaches saturation, after continuing to increase the amount of rare earth carbonate, the dissolution of rare earth carbonate is not complete, the existence of solids wil...

Embodiment 3

[0031] Rare earth carbonate raw materials purchased contain a certain concentration of sulfate radicals. Most of the sulfate radicals can be washed away by washing with water. Image 6is the sulfate radical content of the rare earth carbonate obtained after washing with deionized water for different times. These rare earth carbonates were used and a certain amount of sulfate was added to carry out extraction and saponification experiments to evaluate the effect of sulfate content in rare earth carbonates on the extraction and stripping effects. The extraction experiment was as described above. After adding the above-mentioned rare earth carbonate containing different amounts of sulfate radicals and additional sulfate radicals to 25ml of rare earth bottom solution and 25ml of P507-kerosene organic phase system, the data of rare earth extraction effect are as follows: Figure 7 shown. It shows that when the rare earth carbonate or the aqueous phase contains sulfate, it is not ...

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Abstract

The invention relates to a rare earth saponification method for acidic complex extraction of organic phase, which can replace ammonia soap and sodium soap for the extraction and separation of rare earth elements and save alkali consumption. In the present invention, the acidic complex extraction organic phase represented by P507-kerosene organic phase and the solid rare earth basic compound are synchronously added to the aqueous solution containing free rare earth ions to carry out the organic phase-water phase-solid phase multiphase reaction, wherein the acidic extraction The agent first extracts the free rare earth ions in the water phase and releases hydrogen ions, and the added solid alkaline rare earth compound reacts with these hydrogen ions to dissolve and release rare earth ions to supplement the rare earth ions consumed by the previous extraction. The net effect is alkaline The rare earth compound is dissolved, and the saponification of the rare earth is realized in the organic phase. The concentration of rare earth ions and hydrogen ions in the solution and the concentration of rare earths in the saponified organic phase can be kept at a stable level, and the qualified organic phase can be obtained continuously and stably, so that the discharge of waste water is greatly reduced.

Description

Technical field [0001] The present invention involves the method of extracting organic phase in the process of rare earth extraction separation, which belongs to the field of rare earth and wet metallurgy. technical background [0002] The separation of rare earth extraction is the main method of producing high -purity rare earth compounds and metals. It has been widely used in industry. Moreover, my country's rare earth separation industrialization level is internationally leading.The acidic complexation system is the most widely used extraction system in the separation of rare earth. Because the acid extracting agent will release the hydrogen ions at the same time when extracting rare earth ions, further extraction is suppressed.Therefore, the use of these extractants to extract separation of rare earths must be performed first. Under alkaline conditions, hydrogen ions are exchanged with other cations, so that it does not generate hydrogen ions during the subsequent extraction ...

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 李永绣宋丽莎刘艳珠周雪珍符裕顾建忠陈传旺蔡立林鲍永平徐欣邬元旭
Owner NANCHANG UNIV