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Method for separating tantalum and niobium

A technology of ammonium niobium oxalate and solution, which is applied in chemical instruments and methods, niobium compounds, tantalum compounds, etc., and can solve problems such as high cost

Inactive Publication Date: 2011-01-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are still terminal treatment on the whole, and the cost is relatively high

Method used

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  • Method for separating tantalum and niobium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The raw materials containing tantalum and niobium are added into the hydrofluoric acid solution for dissolution to obtain a solution containing tantalum and niobium-fluorine complexes, and the concentration of hydrofluoric acid in the solution is controlled to be 4mol / L. The tantalum in the obtained solution containing tantalum and niobium-fluorine complex is extracted with methyl isobutyl ketone to obtain an organic phase containing tantalum and an aqueous phase containing niobium. The volume ratio of methyl isobutyl ketone used in the extraction process to the solution containing tantalum and niobium-fluorine complexes is 10:1, and the extraction temperature is 20°C. Wash the obtained tantalum-containing organic phase with 1 mol / L dilute sulfuric acid, and control the volume ratio of the dilute sulfuric acid to the tantalum-containing organic phase to be 1:1 during the washing process. The wash solution is returned to the extraction step. The washed tantalum-containi...

Embodiment 2

[0017] The raw materials containing tantalum and niobium are added into the hydrofluoric acid / sulfuric acid mixed solution to dissolve to obtain a solution containing tantalum and niobium-fluorine complex, and the concentration of hydrofluoric acid in the solution is controlled to be 0mol / L. The tantalum in the obtained solution containing tantalum and niobium-fluorine complex is extracted with methyl isobutyl ketone to obtain an organic phase containing tantalum and an aqueous phase containing niobium. The volume ratio of methyl isobutyl ketone used in the extraction process to the solution containing tantalum and niobium-fluorine complexes is 1:1, and the extraction temperature is 90°C. Wash the obtained tantalum-containing organic phase with 5 mol / L dilute sulfuric acid, and control the volume ratio of the dilute sulfuric acid to the tantalum-containing organic phase to be 5:1 during the washing process. The wash solution is returned to the extraction step. The washed tant...

Embodiment 3

[0021] The raw materials containing tantalum and niobium are added into the hydrofluoric acid / sulfuric acid mixed solution to dissolve to obtain a solution containing tantalum and niobium-fluorine complex, and the concentration of hydrofluoric acid in the solution is controlled to be 2mol / L. The tantalum in the obtained solution containing tantalum and niobium-fluorine complex is extracted with methyl isobutyl ketone to obtain an organic phase containing tantalum and an aqueous phase containing niobium. The volume ratio of methyl isobutyl ketone used in the extraction process to the solution containing tantalum and niobium-fluorine complexes is 3:1, and the extraction temperature is 60°C. The obtained tantalum-containing organic phase was washed with 3 mol / L dilute sulfuric acid, and the volume ratio of the dilute sulfuric acid to the tantalum-containing organic phase was controlled to be 3:1 during the washing process. The wash solution is returned to the extraction step. Th...

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Abstract

The invention relates to a method for separating tantalum and niobium from a raw material containing the tantalum and the niobium, comprising the following steps: dissolving the raw material containing the tantalum and the niobium by utilizing hydrofluoric acid or the mixing solution of the hydrofluoric acid and sulfuric acid to obtain the solution containing tantalum and niobium fluorine coordination compounds; extracting the tantalum by utilizing methyl isobutyl ketone to obtain a tantalum-containing organic phase and a niobium-containing aqueous phase; washing the tantalum-containing organic phase by dilute sulphuric acid, and performing back-extracting by pure water to obtain the pure tantalum liquid; precipitating the niobium-containing aqueous phase to obtain the Nb (OH)5 precipitation; dissolving the obtained Nb (OH)5 precipitation by utilizing an oxalic acid and ammonium oxalate mixing solution to obtain an oxalic acid niobium ammonium solution; carrying out hot filtering, crystallizing, and recrystallizing process to obtain the oxalic acid niobium ammonium crystal; and calcining the crystal to obtain the pure niobium pentaoxide. The method can realize extraction and separation of the tantalum and the niobium at low hydrofluoric acid concentration, and solves the problems that a large amount of fluorine-containing waste liquid and waste residue are generated in the extracting and separating process at the high hydrofluoric acid concentration, and F content in the final product is higher.

Description

field of invention [0001] The invention relates to a hydrometallurgical method for separating tantalum and niobium from raw materials containing tantalum and niobium. Background technique [0002] Tantalum and niobium are rare and precious metals that have been widely used in industry. Because the physical and chemical properties and atomic radius of tantalum and niobium are very similar, in nature, the two usually coexist in the form of isomorphism. To realize the utilization of tantalum and niobium, the separation of the two must be realized first. So far, the separation methods of tantalum and niobium mainly include fluoride salt crystallization separation, chloride distillation separation, solvent extraction separation and ion exchange separation. At present, the separation method of tantalum and niobium widely used in industry is solvent extraction separation method. This method is described in detail in US Patent 3,117,833. The method first treats the raw material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G35/00C01G33/00
Inventor 郑诗礼徐娟王晓辉郭奋张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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