Process for extracting vanadium by acid leaching of stone coal
A stone coal acid and leaching technology, which is applied in the direction of improving process efficiency, can solve the problems of affecting vanadium recovery rate, high production cost, and large reagent consumption, so as to achieve low vanadium loss, good product quality, and low reagent consumption. little effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0022] Example 1
[0023] Vanadium (V 2 O 5 1.06%) of stone coal was added with 6% of CaO to be broken, and then calcined at 800 °C for 2 hours. The calcine was added to sulfuric acid solution at a solid-to-liquid ratio of 1:1.2 g / ml, leached at room temperature for 6 hours and filtered to obtain vanadium (V 2 O 5 6.42g / L) of the leaching solution was added with ammonia water to adjust the pH value to 0.5, and the ammonium aluminum sulfate NH was crystallized out. 4 Al(SO 4 ) 2 ·12H 2 O crystal, add NaHCO to the liquid after crystallization 3 Adjust the pH value to 2.0 to remove iron, to contain 0.21% V 2 O 5 The iron removal slag is then oxidized to 2.0 times of the chemical reaction stoichiometric number of V(V) in the liquid after iron removal, add hydrogen peroxide to oxidize at room temperature for 2h, use strong alkali resin 201×7 to absorb vanadium, contact time 40min, negative vanadium resin 4.0mol / L NH 3 The ammonia water was absorbed, the contact time was 6...
Example Embodiment
[0024] Example 2
[0025] Vanadium (V 2 O 5 1.17%) of the stone coal was crushed and then added concentrated sulfuric acid and mixed well, and then calcined at 250 ° C for 2 hours, and the calcined sand was added at a solid-to-liquid ratio of 1: 1.2 g / ml to the ion-exchange solution obtained in Example 1, leached at 85 ° C for 1.0 hours, and filtered to obtain Vanadium (V 2 O 5 7.23g / L) of the leaching solution, the leaching solution is NH 4 Al(SO 4 ) 2 ·12H 2 O crystals are precipitated by adding 2.0 times the stoichiometric number of the chemical reaction (NH 4 )SO 4 In addition to aluminum, add CaCO to the liquid after aluminum removal 3 Adjust the pH value to 1.9, according to Fe in the solution 2+ oxidized to Fe 3+ Add V(V) 1.0 times the number of chemical reactions, remove iron at 40°C for 1.5h and filter, the filter residue contains 0.05% V 2 O 5 , the filtrate is oxidized to 1.2 times the number of chemical reactions of V(V) according to the low-valent van...
Example Embodiment
[0026] Example 3
[0027] Vanadium (V 2 O 5 0.83%) of the stone coal is crushed and then added to the exchanged liquid obtained in Example 2 at a solid-to-liquid ratio of 1: 1.2 g / ml, and then added concentrated sulfuric acid and oxygen pressure leaching and filtration to obtain vanadium-containing (V 2 O 5 6.62g / L) of the leaching solution, the leaching solution is NH 4 Al(SO 4 ) 2 ·12H 2 1.5 times of the stoichiometric number of O crystals were added to the ammonium-containing transformation solution obtained in Example 2, and N was added. 4 HCO 3 Adjust pH to 2.5 to crystallize out NH 4 Al(SO 4 ) 2 ·12H 2 O crystal, according to Fe in the liquid after crystallization 2+ oxidized to Fe 3+ Add hydrogen peroxide to 1.1 times the number of chemical reactions, stir at room temperature for 1.0h to remove iron, and obtain a solution containing 0.13% V 2 O 5 After iron removal, the liquid is oxidized to ammonium persulfate 1.5 times the number of V(V) chemical reacti...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2023 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap