Method for preparing high-purity vanadium pentoxide from vanadium-chromium solution without ammonium
A technology for vanadium pentoxide and vanadium oxide is applied in the field of preparing high-purity vanadium pentoxide without ammonium from a vanadium-chromium solution, and can solve the problems of intractability, inapplicability, complicated process and the like of a production system
Pending Publication Date: 2022-05-27
四川省绵阳市华意达化工有限公司 +1
2 Cites 0 Cited by
AI-Extracted Technical Summary
Problems solved by technology
View more
Method used
View more
Abstract
The invention discloses an ammonium-free method for preparing high-purity vanadium pentoxide from a vanadium-chromium solution, which comprises the following steps: adding calcium sulfate into the vanadium-chromium solution, adjusting the pH value, heating and stirring to obtain calcium vanadate precipitate and vanadium-free chromium-containing filtrate; washing the calcium vanadate precipitate, and mixing the washed calcium vanadate precipitate with water and a sulfuric acid solution to obtain vanadium-containing leachate and calcium sulfate precipitate; adding a sulfuric acid solution into the vanadium-containing leachate, heating and stirring to obtain hydrated vanadium oxide; mixing the hydrated vanadium oxide with water and an oxalic acid solution, heating and stirring to obtain a vanadyl oxalate solution and a calcium oxalate precipitate; adding an oxalic acid solution into the vanadyl oxalate solution to adjust the pH value, heating and stirring to obtain vanadium dioxide; calcining the vanadium dioxide to obtain vanadium pentoxide; stirring the calcium oxalate precipitate with water and a sulfuric acid solution to obtain an oxalic acid solution and a calcium sulfate precipitate; according to the method, ammonium salt is not used, ammonium-containing wastewater is not generated, waste residues are not discharged, and the purity of the prepared vanadium pentoxide is more than 99.5%; the calcium sulfate precipitate generated in the preparation process can be recycled.
Application Domain
Vanadium oxidesProcess efficiency improvement
Technology Topic
OXALIC ACID DIHYDRATEVanadium dioxide +9
Examples
- Experimental program(7)
Example Embodiment
Example Embodiment
Example Embodiment
PUM


Description & Claims & Application Information
We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.