Unlock instant, AI-driven research and patent intelligence for your innovation.

Low-nitrogen niobium hydroxide preparation method

A niobium hydroxide and solution technology, applied in chemical instruments and methods, inorganic chemistry, niobium compounds, etc., can solve the problems of increasing molecular adsorption force, increasing the density of niobium hydroxide, and high chloride ion content, achieving easy promotion, The effect of easy process and low concentration of hydrochloric acid

Inactive Publication Date: 2020-01-17
CONGHUA TANTALUM & NIOBIUM SMELTERY
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN102465204A provides a method for preparing niobium pentoxide with high bulk density by soaking niobium hydroxide in concentrated hydrochloric acid. At high temperature, it is easier to condense niobium hydroxide molecules into clusters and increase the density of niobium hydroxide per unit volume. However, concentrated hydrochloric acid is not effective in reducing the nitrogen content, and it will also lead to high concentrations in the product. High residual chloride ion content

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of low nitrogen niobium hydroxide comprises the following steps:

[0023] (1) Neutralize the niobium solution with a volume ratio of 1:0.8 and the ammonia water with a concentration of 13.8mol / L to obtain a niobium hydroxide solution, pump it into a filter press for solid-liquid separation to obtain a niobium hydroxide precipitate, and niobium hydroxide The precipitate is washed sequentially with dilute ammonia water and pure water with a concentration of 3mol / L to obtain niobium hydroxide with an F content≦5000ppm, wherein the niobium solution includes the following components: Nb 2 o 5 111.36g / L, Ta 2 o 5 0.01g / L, W 0.005g / L, Si 0.006g / L, Fe 0.0015g / L, H + 5.34mol / L, the concentration of dilute ammonia water is 3mol / L, the ratio of niobium hydroxide precipitation (converted into niobium pentoxide), dilute ammonia water and pure water is 1kg:70L:10L;

[0024] (2) The niobium hydroxide obtained in step (1) is blown dry with air with a pressu...

Embodiment 2

[0027] The preparation method of low nitrogen niobium hydroxide comprises the following steps:

[0028] (1) Neutralize the niobium solution with a volume ratio of 1:0.8 and the ammonia water with a concentration of 13.8mol / L to obtain a niobium hydroxide solution, pump it into a filter press for solid-liquid separation to obtain a niobium hydroxide precipitate, and niobium hydroxide The precipitate is washed sequentially with dilute ammonia water and pure water with a concentration of 3mol / L to obtain niobium hydroxide with an F content≦5000ppm, wherein the niobium solution includes the following components: Nb 2 o 5 111.36g / L, Ta 2 o 5 0.01g / L, W 0.005g / L, Si 0.006g / L, Fe 0.0015g / L, H + 5.34mol / L, the concentration of dilute ammonia water is 3mol / L, the ratio of niobium hydroxide precipitation (converted into niobium pentoxide), dilute ammonia water and pure water is 1kg:70L:10L;

[0029] (2) The niobium hydroxide obtained in step (1) is blown dry with air with a pressu...

Embodiment 3

[0032] The preparation method of low nitrogen niobium hydroxide comprises the following steps:

[0033] (1) Neutralize the niobium solution with a volume ratio of 1:0.7 and the ammonia water with a concentration of 13.8mol / L to obtain a niobium hydroxide solution, pump it into a filter press for solid-liquid separation to obtain a niobium hydroxide precipitate, and niobium hydroxide The precipitate is washed sequentially with dilute ammonia water and pure water with a concentration of 3mol / L to obtain niobium hydroxide with an F content≦5000ppm, wherein the niobium solution includes the following components: Nb 2 o 5 111.36g / L, Ta 2 o 5 0.01g / L, W 0.005g / L, Si 0.006g / L, Fe 0.0015g / L, H + 5.34mol / L, the concentration of dilute ammonia water is 3mol / L, the ratio of niobium hydroxide precipitation (converted into niobium pentoxide), dilute ammonia water and pure water is 1kg:65L:8L;

[0034] (2) The niobium hydroxide obtained in step (1) is blown dry with air with a pressur...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a low-nitrogen niobium hydroxide preparation method, which comprises: (1) neutralizing a niobium solution and ammonia water to obtain a niobium hydroxide solution, pumping the niobium hydroxide solution into a filter press, carrying out solid-liquid separation to obtain niobium hydroxide precipitate, and sequentially washing the niobium hydroxide precipitate with dilute ammonia water and pure water to obtain niobium hydroxide with a F content of less than or equal to 5000 ppm; (2) carrying out blow drying on the niobium hydroxide obtained in the step (1) with air to obtain a niobium hydroxide filter cake with a niobium pentoxide content of 45-55%, and diluting concentrated hydrochloric acid into a diluted hydrochloric acid solution; and (3) adding the niobium hydroxide filter cake into a diluted hydrochloric acid solution, stirring for 20-40 min to obtain a mixed solution, putting the mixed solution into a suction filtration tank, carrying out suction filtration,adding pure water into the suction filtration tank, carrying out stirring washing, carrying out suction drying, repeatedly carrying out stirring washing and suction drying three times to obtain a precipitate, and drying the precipitate in a drying box for 10-12 h to obtain the low-nitrogen niobium hydroxide. According to the method of the invention, the nitrogen content in the niobium hydroxide product can reach less than 0.2%.

Description

technical field [0001] The invention relates to a preparation method of low-nitrogen niobium hydroxide. Background technique [0002] The preparation method of niobium hydroxide is generally to use niobium liquid to neutralize with ammonia water in the precipitation tank to obtain Nb(OH) 5 Precipitate, then pumped into a filter press for solid-liquid separation, washed with dilute ammonia water, filtered to remove Nb(OH) 5 Fluoride ions in the solution, then washed with pure water, and dried with air at 0.6~0.7Mpa to get wet Nb(OH) 5 , put it into a hot air circulation drying box and dry to obtain niobium hydroxide. Niobium hydroxide that has not been treated with hydrochloric acid is dried into niobium hydroxide to convert Nb 2 o 5 When the content is 72~78%, the nitrogen content is ≧3.5%, which cannot meet the low nitrogen requirement. [0003] Chinese patent CN102465204A provides a method for preparing niobium pentoxide with high bulk density by soaking niobium hydro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00
CPCC01G33/00
Inventor 刘自喜周丽江腾荣
Owner CONGHUA TANTALUM & NIOBIUM SMELTERY