Method for intensifying vanadium extraction through roasting and acid leaching of vanadium shale

Through the acid leaching method of baking powder in batches, combined with circulating leaching agent and pH adjustment, the problems of large acid consumption, large auxiliary agent consumption and low vanadium leaching rate in vanadium shale extraction were solved, and efficient vanadium extraction and impurity separation were achieved.

CN119663019AActive Publication Date: 2025-03-21WUHAN UNIV OF SCI & TECH
7 Cites 0 Cited by

Patent Information

Application Number
CN202510115183.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-24
Publication Date
2025-03-21
Estimated Expiration
2045-01-24

AI Technical Summary

Technical Problem

During the extraction process of existing vanadium shale, there are problems such as large acid consumption, large impregnation agent consumption, low vanadium leaching rate and poor separation effect of vanadium and impurities.

Method used

The broken vanadium shale is calcined into a baking powder and leaching in batches, and the vanadium leaching is acid-leached with concentrated sulfuric acid and a supplementary agent (a mixture of sodium nitrate or sodium nitrite and fluoride). Recycled leaching agent is used to reduce the acid dosage and the auxiliary agent consumption, and selective separation of vanadium and impurities is achieved through steps such as pH adjustment and solvent extraction.

Benefits of technology

The effect of small acid consumption, low impregnation agent consumption, high vanadium leaching rate and good separation effect of vanadium and impurities during the leaching process is achieved.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to a method for intensifying vanadium extraction through roasting and acid leaching of vanadium shale. According to the scheme, the method comprises the following steps: crushing, roasting and grinding vanadium shale, and equally dividing to obtain n batches of roasted powder; adding water and concentrated sulfuric acid into the first batch of roasting powder, and then adding a first batch of leaching aid; and leaching, and carrying out solid-liquid separation to obtain a second batch of circulating leaching agent and a first batch of leaching liquid. A second batch of circulating leaching agent, concentrated sulfuric acid and water are added into the second batch of roasting powder to be mixed, and then a second batch of leaching assistant agent is added; and leaching, and carrying out solid-liquid separation to obtain a third batch of circulating leaching agent and a second batch of leaching liquid. ,...; the nth batch of circulating leaching agent and the (n-1) th batch of leaching agent are obtained, and n is a natural number ranging from 3 to 10. Mixing the n batches of lixiviates, adjusting the pH value, and adding sodium sulfite to obtain an extraction stock solution; and carrying out counter-current extraction and vanadium precipitation on the extraction stock solution to prepare vanadium pentoxide. The method is low in acid consumption, low in leaching aid consumption, high in vanadium leaching rate and good in vanadium and impurity separation effect.
Need to check novelty before this filing date? Find Prior Art