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

Method for separating vanadium pentoxide by two-stage melt crystallization

A technology of vanadium pentoxide and melting crystallization, which is applied in the direction of vanadium oxide, etc., can solve the problems of high cost, lengthy and complicated process, and achieve the effects of reducing production cost, shortening process and reducing losses

Active Publication Date: 2022-03-18
UNIV OF SCI & TECH BEIJING +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for separating vanadium pentoxide by two-stage melting and crystallization to solve the problems of lengthy, complicated and costly separation of metallurgical grade vanadium pentoxide in the prior art. Vanadium is heated and melted, and then high-purity vanadium pentoxide is obtained through two crystallization separations, and metallurgical grade vanadium pentoxide by-products containing impurities with different melting points are obtained at the same time

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 separating vanadium pentoxide by two-stage melt crystallization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] combine figure 1 As shown, a method for separating vanadium pentoxide by two-stage melting and crystallization in this embodiment comprises the following steps: heating metallurgical-grade vanadium pentoxide to a molten state under a high pressure environment, and carrying out one step respectively under a high pressure environment. The first-level crystallization and the first-level filtration obtain the first-level crystallization product and the first-level filtrate, then carry out the second-level crystallization and the second-level filtration of the above-mentioned first-level filtrate to obtain the second-level crystallization product and the second-level filtrate, and finally the above-mentioned second-level filtrate After cooling, vanadium pentoxide with low melting point is obtained. The specific steps are:

[0035] Step 1: Melting

[0036] In this embodiment, the primary crystallizer is pressurized first, and the pressurization method is to inject oxygen in...

Embodiment 2

[0048] This embodiment is basically the same as Embodiment 1, the difference is that high-pressure operation is adopted in the primary crystallizer, and the difference is that argon gas is injected into the primary crystallizer so that the internal pressure of the primary crystallizer reaches 5 atmospheres. The finally extracted secondary crystallization product, that is, the high-purity vanadium pentoxide has a purity of 99.999%, and the yield of the high-purity vanadium pentoxide is 90.6%.

[0049] Embodiment 1, comparative example 1 and embodiment 2 are comparatively analyzed:

[0050] Comparing Example 1 with Comparative Example 1, it is found that, compared with no high-pressure operation, the high-purity vanadium pentoxide extracted by high-pressure operation is not only higher in purity but also higher in yield. This is mainly because the high-pressure operation not only suppresses the volatilization of vanadium pentoxide, but also inhibits its decomposition. In additio...

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 discloses a method for separating vanadium pentoxide by two-stage melting and crystallization, which belongs to the technical fields of chemical industry and materials. In the present invention, metallurgical-grade vanadium pentoxide is first heated to a molten state in a high-pressure environment, and the primary crystallization and primary filtration are respectively performed under a high-pressure environment to obtain a primary crystallization product and a primary filtrate, and then the above-mentioned primary filtration The liquid is subjected to secondary crystallization and secondary filtration to obtain secondary crystallization products and secondary filtrate, and finally the above secondary filtrate is cooled to obtain low melting point vanadium pentoxide; use metallurgical grade vanadium pentoxide as raw material for two-stage melting Crystallization and refining, no other fluxes are used in the whole process, avoiding secondary pollution caused by other fluxes; high-melting point and low-melting point impurities in vanadium pentoxide are removed in stages, achieving the purpose of high-efficiency, clean, energy-saving purification; under high pressure environment Perform primary crystallization and primary filtration to increase the purity and yield of vanadium pentoxide.

Description

technical field [0001] The invention relates to the technical fields of chemical industry and materials, and more specifically, relates to a method for separating vanadium pentoxide by two-stage melt crystallization. Background technique [0002] Vanadium pentoxide (V 2 o 5 ) is an important industrial vanadium product, and is the main raw material for producing vanadium products such as ferrovanadium, vanadium nitride and vanadium carbide, and is widely used in metallurgy, chemical industry, aerospace, aviation, new energy and other fields. In recent years, with the rapid development and progress of new energy technologies, battery industries such as all-vanadium redox flow batteries and vanadate-based lithium-ion batteries for electric vehicles are demanding high-purity V 2 o 5 The demand for it is increasing year by year, and the requirements for its purity are also becoming stricter. However, at present, the quality of domestic vanadium pentoxide is generally metallu...

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 Patents(China)
IPC IPC(8): C01G31/02
CPCC01G31/02C01P2006/80
Inventor 李亚琼张立峰
Owner UNIV OF SCI & TECH BEIJING