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A mixed amine extractant for the separation of molybdenum and vanadium and a method for separating and recovering molybdenum and vanadium from spent catalysts

A waste catalyst, separation and recovery technology, applied in the direction of improving process efficiency, etc., can solve the problems that the separation of vanadium and molybdenum cannot be realized, and the separation coefficient is not much different.

Active Publication Date: 2020-07-07
肇庆市珈旺环境技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are a large number of related reports on the use of amine extractants for the extraction and separation of anions such as tungsten, molybdenum, and vanadium. High, short phase separation time, excellent extraction and stripping performance, etc., but imidazoline extractants have similar extraction capabilities to vanadium and molybdenum, and the separation coefficient is not much different. They are mainly used to extract vanadium and molybdenum, but cannot achieve vanadium molybdenum. separate

Method used

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  • A mixed amine extractant for the separation of molybdenum and vanadium and a method for separating and recovering molybdenum and vanadium from spent catalysts
  • A mixed amine extractant for the separation of molybdenum and vanadium and a method for separating and recovering molybdenum and vanadium from spent catalysts
  • A mixed amine extractant for the separation of molybdenum and vanadium and a method for separating and recovering molybdenum and vanadium from spent catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Accurately measure the mixed amine extractant with a volume fraction of 16% (the volume ratio of formula 1 and formula 2 is 1:1) + 14% isooctyl alcohol + sulfonated kerosene, mix well, and dilute hydrochloric acid and sodium chloride After pretreatment of the mixed solution, for Mo101.00g / L, V 2 o 5 9.87g / L of vanadium and molybdenum leachate was extracted, compared with O / A=1:2, the oscillation frequency was 190r / min, oscillated for 10min at room temperature, and solid sodium hydroxide was added to change the pH of the leachate, the extraction rate and separation of molybdenum and vanadium The coefficients are shown in Table 1:

[0050] Table 1 Effect of equilibrium pH on extraction and separation of molybdenum and vanadium in leach solution

[0051] balance pH 7.52 8.73 9.63 10.51 11.72 13.01 Vanadium extraction rate / % 55.72 52.38 20.64 1.31 0.72 0.18 Molybdenum extraction rate / % 0.71 0.21 0.34 0.56 0.24 0.12 Separation coe...

Embodiment 2

[0054] Accurately measure a mixed amine extractant with a volume fraction of 15% (the volume ratio of formula 1 and formula 2 is 2:1) + 15% isooctyl alcohol + sulfonated kerosene, mix well, and mix with dilute hydrochloric acid and sodium chloride After solution pretreatment, for Mo 101.00g / L, V 2 o 5 9.87g / L of vanadium and molybdenum leachate was extracted, compared with O / A=1:2, the oscillation frequency was 190r / min, oscillated for 10min at room temperature, and solid sodium hydroxide was added to change the pH of the leachate, the extraction rate and separation of molybdenum and vanadium The coefficients are shown in Table 2:

[0055] Table 2 Effect of equilibrium pH on extraction and separation of molybdenum and vanadium in leach solution

[0056] balance pH 7.02 8.13 9.11 10.08 11.22 12.01 Vanadium extraction rate / % 58.36 56.31 23.46 4.13 2.27 1.08 Molybdenum extraction rate / % 6.17 4.13 2.54 1.76 0.89 0.42 Separation coeffici...

Embodiment 3

[0064] The composition of the organic phase is: 15% mixed extractant (the volume ratio of formula 1 and formula 2 is 2:1) + 12% isooctyl alcohol + 73% sulfonated kerosene, for Mo 101.00g / L, V 2 o 5 9.87g / L of vanadium-molybdenum leach solution was used for phase-distorted extraction, the oscillation frequency was 190r / min, and the oscillation frequency was 10min at room temperature. The pH of the feed solution was 9.12. The extraction isotherms of molybdenum and vanadium were as follows: figure 1 Shown:

[0065] From figure 1 It can be seen that as the ratio O / A decreases, the content of vanadium in the organic phase increases rapidly at first, and then tends to remain unchanged. At this time, the content of vanadium in the organic phase reaches saturation. It can be known that, when the extractant content is 15%, the saturation capacity of vanadium in the organic phase is 20.87g / L. In addition, according to the isotherm curve of Mo, it can be seen that the organic phase c...

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Abstract

The invention relates to a mixed amine extractant for the separation of molybdenum and vanadium and a method for separating and recovering molybdenum and vanadium from waste catalysts. The mixed amine extractant includes imidazole compounds and quaternary ammonium salt compounds, which are separated from waste catalysts. The method for recovering molybdenum and vanadium is as follows: the waste catalyst containing molybdenum and vanadium is leached with alkali to obtain a leach solution containing molybdenum and vanadium, and the leach solution containing molybdenum and vanadium is extracted and separated by an organic phase containing a mixed amine extractant, and the raffinate The solution is a molybdenum-containing solution, and the loaded organic phase is washed and stripped to obtain a vanadium-containing solution; the mixed amine extractant has the characteristics of large saturation capacity, short phase separation time, excellent extraction and stripping performance, and high separation coefficient of molybdenum and vanadium. The method can realize high-efficiency separation of vanadium and molybdenum in the alkaline solution system, and has good industrial application prospects.

Description

technical field [0001] The present invention relates to a combined extractant, and also relates to a method for separating and recovering molybdenum and vanadium from waste catalyst leaching liquid by using the combined extractant, so as to realize resource utilization of hazardous solid waste containing molybdenum and vanadium spent catalyst, which belongs to the resource recovery and utilization of solid waste field of hydrometallurgy. Background technique [0002] Due to the over-exploitation of molybdenum-vanadium mineral resources and the rapid development of science and technology, the application range of molybdenum, vanadium and their compounds is continuously expanding, and the consumption is increasing day by day. The limited resources are decreasing day by day, and the grade of ore is gradually decreasing. Therefore, how to effectively enrich valuable metals such as molybdenum and vanadium and separate them from other high-content impurities is a test for domesti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/40C22B34/22C22B34/34
CPCC22B7/006C22B7/009C22B34/225C22B34/345C22B3/402Y02P10/20
Inventor 侯浩波梁安娜雷杰妮罗腾何雯婧李政家
Owner 肇庆市珈旺环境技术研究院
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