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Pretreatment method and extraction method of di(2-ethylhexyl) phosphate extraction agent

An ethylhexyl, pretreatment technology, applied in the field of extraction agent, acid extraction agent diphosphate, can solve the problems of increasing acid consumption, high-salt wastewater and the like

Active Publication Date: 2021-09-07
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above-mentioned method of processing an acidic extractant by strong alkali saponification has the following disadvantages: (1) every time the saponification of the extractant is carried out, it is required to prepare a strong alkali solution again; (2) when the saponification rate of the extractant is relatively high, the extraction In the process, it is necessary to use acid to control the pH value of the feed liquid, which will increase the consumption of acid and produce high-salt wastewater

Method used

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  • Pretreatment method and extraction method of di(2-ethylhexyl) phosphate extraction agent
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  • Pretreatment method and extraction method of di(2-ethylhexyl) phosphate extraction agent

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Pretreatment of extractant P204 by acetic acid buffer solution:

[0036] Using sulfonated kerosene as a diluent, the extractant P204 is prepared into an organic phase with a concentration of 0.25mol / L;

[0037] The HAc-NaAc aqueous solution with a total concentration of 3mol / L and a pH of 4.27 was mixed with the above-mentioned extractant in an organic equal volume ratio for 15 minutes, then left to separate phases, and the resulting organic phase was taken as the pretreated extractant, and the remaining aqueous phase was Circulation is used for the pretreatment of P204, and the water phase that obtains after multiple circulation pretreatment, i.e. the pH value of pretreatment liquid is tested, and its result is as shown in table 1:

[0038] Table 1 The impact of the cycle times on the pH value of the pretreatment solution

[0039]

[0040] It can be seen that the pretreatment solution has a higher buffer capacity, and the H released by P204 + Has a good cushioning...

Embodiment 2

[0042] The extractant after the pretreatment obtained in Example 1 extracts and separates cobalt and manganese mixed feed liquid, wherein the feed liquid contains 2g / L Co 2+ and 2g / L Mn 2+ The dilute sulfuric acid aqueous solution, the extraction conditions are: temperature 25 ℃, ratio O / A is 1: 1, extraction equilibrium time is 15min, manganese, cobalt extraction and separation results are shown in Table 2:

[0043] Table 2 Manganese, cobalt extraction and separation results

[0044]

[0045] It can be seen that the pH value of the raffinate obtained from the feed liquid with an initial pH value in the range of 3.60-4.60 is similar, and the extraction effect is equivalent. Therefore, there is no need to strictly control the acidity of the feed liquid before extraction, and it is not necessary to add any acid or alkali to adjust the acidity during the extraction process. The primary extraction rate of the separated manganese is more than 90%, and the extraction efficiency...

Embodiment 3

[0047] The P204 of 0.25mol / L was processed by the same pretreatment method as in Example 1, and only the pH value of the pretreatment solution was changed to 3.64. The pretreated extractant extracts and separates the above-mentioned cobalt and manganese mixed feed liquid, the pH of the feed liquid=4.00, Co 2+ and Mn 2+ The concentration of all is 2g / L, and extraction condition is identical with embodiment 2. After extraction, the pH value of the raffinate was 3.16, the extraction rates of manganese and cobalt were 89.5% and 13.3% respectively, and the separation factor was 55.5.

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Abstract

The invention discloses a pretreatment method and an extraction method of a di(2-ethylhexyl) phosphate extraction agent. The pretreatment method comprises the steps that the di(2-ethylhexyl) phosphate is pretreated by a buffer solution serving as a pretreatment agent, the concentration of the buffer solution is 1-5 mol / L, and the pH value is 3.6-5.0. The saponification process of the extraction agent can be effectively simplified, consumption of acid and alkali in the extraction process and emission of secondary pollutants such as salt and organic matter are reduced, and the pretreatment method has a high metal ion extraction and separation effect.

Description

technical field [0001] The present invention relates to the technical field of extractant, more specifically, relate to the technical field of acidic extractant di(2-ethylhexyl) phosphate. Background technique [0002] Two (2-ethylhexyl) phosphate (P204) is an acidic extractant, the pK in 75% ethanol aqueous solution a The value is 3.42, which can be combined with various metal ions, and is widely used in the extraction and separation of metals. The extraction rate of different metal ions by P204 is related to the acidity of the feed solution. The order of extracting common metal ions is as shown in the attached manual figure 1 shown. Therefore, under the condition of controlling the acidity of the feed solution, the extractant P204 can extract and separate different metal ions. For example, the extractant P204 can extract zinc from the zinc-containing feed liquid to realize separation from copper and manganese, and extract copper and manganese from the cobalt-containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B15/00C22B19/20C22B47/00
CPCC22B47/00C22B15/0086C22B19/20Y02P10/20
Inventor 赵云斌王梦婷
Owner HUAZHONG UNIV OF SCI & TECH
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