Process for producing vanadium pentoxide from vanadiferous coal stone

Abstract

This invention relates to a new method for producing V2O5 with coal containing V stones aiming at providing a kind of coal with V stones to be Na-free spacing baked, pre-oxidized to be picked-up by diluted H2SO4 directly to get a V salt solution then to be extracted by TOA organic solvent to increase yield of V products and reduce cost of H2SO4 characterizing in crushing coal with V stones to spheres to be processed by Na-free spacing baking to get rid of carbon and crushed and added with oxidation agent for pre-oxidation process, adding diluted H2SO4 for leaching and filtering it, which is extracted to get V with water organic phase to be counter-extracted, heated, deposited and filtered to get rough products with V, and the final product V2O5 with the content of 99% is got after oxidizing and baking poly-V ammonium or ammonium metavanadate after being purified, and the rest solution after extraction is added with limewater and filtered to be recovered for leaching.

Description

technical field [0001] The invention belongs to a new process for producing vanadium pentoxide from vanadium-containing stone coal. Background technique [0002] At present, vanadium pentoxide is mostly produced from vanadium-containing stone coal by roasting with sodium chloride, directly dissolving with water, precipitating ammonium metavanadate with ammonium salt, and then oxidizing it into vanadium pentoxide at high temperature. The low yield of this process is only about 45%, and in the process of sodium roasting, about 25 tons of sodium chloride need to be added for roasting per ton of product, thus producing a large amount of chlorine and hydrogen chloride gas, discharging a large amount of waste water, and causing serious pollution The surrounding environment destroys the ecological balance. Therefore, in order to protect the environment, many places have shut down the production plants using this type of technology. For this reason, many scientific research instit...

AI Technical Summary

Problems solved by technology

Although the Jiangxi Provincial Coal Industry Science Research Institute has adopted the process of producing vanadium pentoxide from the vanadium-containing slag roasted in a fluidized bed furnace without sodium, it needs to consume a large amount of acid in the production process, and the consumption is 45% of that of stone coal slag. About 50 liters of concentrated sulfuric acid is needed, and a large amount of waste water is generated

Hunan Provincial Coal Research Institute once used sodium-free blank roasting, N 263 New processes such as solvent extraction, but due to factors such as immature process conditions and low product yields, industrial production has not been realized

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