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

Method for extracting niobium from pyrochlore

A pyrochlore and stone grinding technology, applied in the field of niobium extraction, can solve the problems of ecological environment pollution, volatile hydrofluoric acid, harsh working environment, etc., and achieve the effect of reducing environmental pollution

Inactive Publication Date: 2017-08-29
JIANGXI UNIV OF SCI & TECH
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In summary, the problems in the prior art are: the existing hydrofluoric acid process uses 60-70% hydrofluoric acid as the decomposition medium, the decomposition temperature is as high as 80-90°C, and the hydrofluoric acid is volatile, which not only causes The working environment is harsh, and it leads to serious pollution of the entire ecological environment, which has seriously restricted the sustainable development of my country's tantalum and niobium metallurgical industry

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for extracting niobium from pyrochlore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Grind 20g of a certain pyrochlore to -0.074mm, and then add it into a mixed solvent of hydrochloric acid and ammonium fluoride, wherein the concentration of hydrochloric acid is 10mol / L, the ammonium fluoride is 30g, and the liquid-solid ratio is 6:1; the ingredients are transferred to The leaching reaction was carried out in an autoclave with a pressure of 1.5 MPa, a temperature of 180° C., and a reaction time of 2 h. The leached pulp is filtered to obtain a niobium-containing solution. After analysis, the leaching rate of niobium reached 96.89%.

Embodiment 2

[0026] Grind 20g of a certain pyrochlore to -0.074mm, and then add it into a mixed solvent of hydrochloric acid and ammonium fluoride, wherein the concentration of hydrochloric acid is 8.5mol / L, the ammonium fluoride is 40g, and the liquid-solid ratio is 5:1; transfer the ingredients Carry out the leaching reaction in an autoclave with a pressure of 2.0 MPa, a temperature of 200° C., and a reaction time of 2.5 hours. The leached pulp is filtered to obtain a niobium-containing solution. After analysis, the leaching rate of niobium reached 95.66%.

Embodiment 3

[0028] Grind 20g of a certain pyrochlore to -0.074mm, then add it into a mixed solvent of hydrochloric acid and potassium fluoride, wherein the concentration of hydrochloric acid is 12.5mol / L, ammonium fluoride is 36g, and the liquid-solid ratio is 7:1; transfer the ingredients Carry out leaching reaction in an autoclave, the pressure is 2MPa, the temperature is 180°C, and the reaction time is 2.5h. The leached pulp is filtered to obtain a niobium-containing solution. After analysis, the leaching rate of niobium reached 95.62%.

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 belongs to the technical field of tantalum and niobium mineral substances, and discloses a method for extracting niobium from pyrochlore. The method for extracting niobium from pyrochlore comprises the following steps: the pyrochlore is smashed, and is added in mixed solvent of hydrochloric acid and villiaumite; the mixture is pressed to leach by 1.5-3 h; and the leached pulp is filtered to obtain filtrate containing tantalum and niobium. The method solves the problem of serious restriction of sustainable development of the national tantalum and niobium metallurgical industry due to bad environmental pollution in a traditional hydrofluoric acid process; the invention provides a new green metallurgical technology for sustainable development of developed tantalum and niobium resources to relieve environmental pollution; and the leaching rate of niobium reaches above 95%.

Description

technical field [0001] The invention belongs to the technical field of tantalum-niobium minerals, in particular to a method for extracting niobium from pyrochlore. Background technique [0002] Tantalum and niobium are rare and precious metals. Tantalum has excellent characteristics such as high hardness, high dielectric constant, high resistivity, and corrosion resistance. It is mainly used in the production of capacitors (accounting for more than 60% of the total consumption of tantalum). Niobium is the most excellent steel microalloying element, and niobium used as a steel alloy additive accounts for more than 90% of the total consumption of niobium. In recent years, with the rapid development of the electronic information industry and the continuous growth of demand for high value-added steel products, the rapid development of my country's tantalum and niobium industry has created a good opportunity for the development of tantalum and niobium hydrometallurgy. At presen...

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): C22B3/10C22B34/24
CPCC22B3/10C22B34/24Y02P10/20
Inventor 杨秀丽张军伟方清
Owner JIANGXI UNIV OF SCI & TECH