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Method of purifying niobium compound and/or tantalum compound

A technology of tantalum compounds and niobium compounds, which is applied in the fields of niobium compounds, tantalum compounds, chemical instruments and methods, etc., and can solve problems such as difficulty in obtaining absorbents, dissolution of organic solvents into water, etc.

Inactive Publication Date: 2005-07-13
STELLA CHEMIFA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to obtain an absorbent cross-linked with an organic solvent, and when the organic solvent is impregnated into a porous carrier, there is a problem that the organic solvent dissolves into the water phase.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] After adding 500g of 75%-HF or 495g of 75%-HF and 5g of 98% sulfuric acid into a transparent PFA container with a capacity of 1L with a stirrer, add the metal impurities shown in Table 1 within about 3 hours while stirring. After adding 150 g of ferroniobium alloy, it was stirred at room temperature. Thereafter, a niobium hydrofluoric acid solution of approximately 300 g / L in terms of niobium element was prepared by removing insoluble matter by filtration.

[0023] Thereafter, while stirring the above-mentioned niobium hydrofluoric acid solution, carry out crystallization at -20°C for 2 hours, then take out the crystallization through filtration, add 28% ammonia water 65g to this niobium crystal solution, and make niobium After precipitation as niobium hydroxide, ammonium fluoride and the like were removed by filtration to obtain niobium hydroxide.

[0024] The obtained niobium hydroxide was fired in an electric furnace at 1000° C. to obtain niobium oxide. The obtaine...

Embodiment 2

[0026] Put 500g of 100%-HF (anhydrous hydrofluoric acid), 75%-HF, 50%-HF or 30%-HF into a transparent PFA container with a capacity of 1L with a stirrer, and keep it at -20°C or room temperature While stirring, 150 g of niobium oxide containing metal impurities shown in Table 2 was added over about 3 hours, followed by stirring. Furthermore, the 50%-HF and 30%-HF solutions were stirred under reflux at 70°C. Thereafter, a niobium hydrofluoric acid solution of approximately 300 g / L in terms of niobium element was prepared by removing a small amount of insoluble matter by filtration. Similarly, niobium oxide was dissolved after adding 495 g of 50%-HF and 5 g of 98% sulfuric acid or 69% nitric acid to a transparent PFA container having a stirrer and a capacity of 1 L.

[0027] The niobium oxide used above is a 98% niobium oxide industrial product after pretreatment to reduce the concentration of impurities.

[0028] Here, the above-mentioned prepared solutions were analyzed with...

Embodiment 3

[0032] Add 50%-HF 500g to a transparent PFA container with a capacity of 1L equipped with a stirrer, and add 130g of tantalum oxide containing metal impurities shown in Table 3 while stirring at room temperature, and then add at 70°C. Stir at warm reflux for about 5 hours.

[0033] Thereafter, it is prepared as a tantalum hydrofluoric acid solution in which a small amount of insoluble matter is removed by filtration, and converted to about 300 g / L of tantalum element. Similarly, tantalum oxide was dissolved after adding 495 g of 50%-HF and 5 g of 98% sulfuric acid or 69% nitric acid to a transparent PFA container having a stirrer and a capacity of 1 L. Furthermore, the tantalum oxide used this time is a 98% tantalum oxide industrial product that has been pre-treated to reduce the concentration of impurities.

[0034] Thereafter, while stirring the above-mentioned tantalum hydrofluoric acid solution or tantalum mixed acid solution, carry out crystallization at -20°C for 2 hour...

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PUM

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Abstract

The invention provides a more convenient and low-cost method for refining niobium compounds and / or tantalum compounds. The method for purifying such a niobium compound and / or tantalum compound is characterized in that it purifies from a solution of the niobium compound and / or tantalum compound by crystallization.

Description

technical field [0001] The present invention belongs to a method for increasing the purity of niobium compounds and / or tantalum compounds. Background technique [0002] Since niobium has the effect of stabilizing carbon in steel and preventing intergranular corrosion, it is used as an additive to steel. In addition, niobium alloys have been put into practical use as conductive tubes attached to lamp light emitting parts of high-pressure sodium lamps, and are further utilized as superconducting materials and additive elements of superalloys. Furthermore, niobium oxide has been in great demand in recent years, and it is widely used in the fields of electronics and optics. Especially in these fields, high-purity niobium has gradually become necessary and indispensable. As a method of refining niobium compounds, various refining methods are adopted depending on the raw material, but taking niobium oxide, one of them, as an example, methods such as separate crystallization, solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00C01G35/00C01G35/02C22B3/44C22B34/20C22B34/24
CPCC01G33/00C01G35/00C01G35/02C01P2006/80C22B3/10C22B3/44C22B34/20C22B34/24Y02P10/20
Inventor 菊山裕久胁雅秀泉浩人矢崎洋史青木谦治桥口慎二川胁理谒村上祐子
Owner STELLA CHEMIFA CORP
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