Method for selectively separating tantalum and niobium step by step based on floating extraction

A selective, tantalum-niobium technology, applied in the field of selective fractional separation of tantalum and niobium based on flotation extraction, can solve problems such as selective deep separation of difficult tantalum and niobium, and achieve selective fractional separation of tantalum and niobium, high-efficiency separation, high-efficiency enriched effect

Active Publication Date: 2020-06-16
ZHENGZHOU UNIV
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Problems solved by technology

[0007] Aiming at the problems that the existing tantalum and niobium separation technology is difficult to realize the selective deep separation of tantalum and niobium, the purpose of the present invention is to provide a method for selectively separating tantalum and niobium based on floating extraction. The tantalum / niobate is deeply enriched, and for the tantalum and niobium components with a high enrichment ratio, the pH of the solution is adjusted and the niobium stripping agent and tantalum stripping agent are added respectively to obtain tantalum liquid and niobium liquid

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  • Method for selectively separating tantalum and niobium step by step based on floating extraction

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Embodiment 1

[0024] A method for the selective step-by-step separation of tantalum and niobium based on planktonic extraction, such as figure 1 As shown, the process is as follows:

[0025] (1) Add hydrofluoric acid with a concentration of 35wt% ~ 40wt% to 1 L solution with a concentration of tantalate radicals of 5 g / L and a concentration of niobate radicals of 5 g / L, so that the tantalum and niobium in the solution are converted into tantalum fluoride and fluorine Niobate, control the free hydrofluoric acid in the solution to 1 wt% ~ 2wt%. Add a floating extraction agent to the above solution, and its composition is: 50 parts by mass of dodecylamine, 30 parts by mass of methyl isobutyl ketone, 20 parts by mass of humic acid, the concentration is 10 g / L, and then add sodium hexametaphosphate to disperse The concentration is 200 mg / L, air is passed into the solution to form microbubbles with a diameter of 100 nm~10 μm, and the hydrophobic mineralized bubbles-fluorine tantalum / niobate-flot...

Embodiment 2

[0031] A method for the selective step-by-step separation of tantalum and niobium based on planktonic extraction, such as figure 1 As shown, the process is as follows:

[0032] (1) Add hydrofluoric acid with a concentration of 20wt% to 30wt% to 1L solution with a concentration of tantalate radicals of 2 g / L and a concentration of niobate radicals of 200 mg / L, so that the tantalum and niobium in the solution are converted into fluorotantalate and fluoroniobium Acid radicals, control the free hydrofluoric acid in the solution to 1 wt% ~ 2 wt%. Add a floating extraction agent to the above solution, which is composed of: 50 parts by mass of dodecylamine, 30 parts by mass of methyl isobutyl ketone, 20 parts by mass of humic acid with a concentration of 5 g / L, and then add sodium hexametaphosphate to disperse The concentration is 100 mg / L, the solution is filled with air to form microbubbles with a diameter of 100 nm~10 μm, and the hydrophobic mineralized bubbles-fluorine tantalum / ...

Embodiment 3

[0038] A method for the selective step-by-step separation of tantalum and niobium based on planktonic extraction, such as figure 1 As shown, the process is as follows:

[0039] (1) Add hydrofluoric acid with a concentration of 10wt% ~ 20wt% to 1 L solution with a concentration of tantalate radicals of 100 mg / L and a concentration of niobate radicals of 100 mg / L, so that the tantalum and niobium in the solution are converted into fluorotantalate radicals, fluorine Niobate, control the free hydrofluoric acid in the solution to 1 wt% ~ 2 wt%. Add a floating extraction agent to the above solution, and its composition is: 50 parts by mass of dodecylamine, 30 parts by mass of methyl isobutyl ketone, 20 parts by mass of humic acid, the concentration is 200 mg / L, and then add sodium hexametaphosphate to disperse The concentration is 50 mg / L, the solution is filled with air to form microbubbles with a diameter of 100 nm~10 μm, and the hydrophobic mineralized bubbles-fluorine tantalum / ...

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Abstract

The invention discloses a method for selectively separating tantalum and niobium step by step based on floating extraction. The method comprises the following steps of adding hydrofluoric acid to a solution containing tantalum and niobium to convert tantalum and niobium in the solution into fluorotantalate and fluoroniobate; adding a floating extraction agent and a bubble dispersant to the solution and introducing air to form microbubbles, promoting the hydrophobic mineralization of bubbles to form fluorine tantalum/niobate-floating extraction agent-bubble microdroplets, and finally enrichingtantalum and niobium components by floating extraction; adding a pH adjuster and a niobium stripping agent to the tantalum-niobium-enriched component to obtain niobium liquid after stripping; and thenadding a pH adjuster and a tantalum stripping agent to a stripping raffinate and stripping to obtain a tantalum solution. The method has good selective separation effect on tantalum and niobium, simple process flow and low operation cost, effectively overcomes the shortcomings of multi-stage solvent extraction and stripping, and is particularly suitable for deep separation of tantalum and niobium.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for selectively separating tantalum and niobium in steps based on floating extraction. Background technique [0002] Tantalum and niobium are rarely distributed in the earth's crust. As important rare and precious metals, they have the characteristics of high melting point, good plasticity, and stable chemical properties. They are widely used in electronics, atomic energy, aerospace, medicine, steel, and hard alloys. Tantalum and niobium are located in the 5th and 6th periods of group VB of the periodic table, and are typical similar elements. They often coexist in niobite, pyrochlore and other minerals in nature. Due to the similar chemical properties of tantalum and niobium, the atomic radius is almost the same, so it is very difficult to separate tantalum and niobium. At present, the commonly used methods for the separation of dissolved tantalum a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26C22B34/24B03D1/002B03D101/00B03D103/02
CPCC22B34/24B03D1/002B03D2201/005B03D2201/007B03D2203/02C22B3/402Y02P10/20
Inventor 韩桂洪刘兵兵黄艳芳苏盛鹏薛毓斌王益壮
Owner ZHENGZHOU UNIV
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