Technique for producing vanadium pentoxide

Abstract

This invention discloses a process for producing V2O5 from vanadium-containing stone coal or vanadium slag. The process comprises: adding M-1 type additive to vanadium-containing stone coal or vanadium slag, torrefying, leaching with diluted H2SO4 to obtain vanadium salt solution, extracting vanadium aggregate from the vanadium salt solution by using N-1 type aggregation agent, removing impurities, adding P-1 type separation agent for separation, precipitating vanadium, oxidizing to obtain V2O5, recovering Al and Fe from the system, and producing Al2 (SO4)3 and iron red. The process has such advantages as no Cl2 or HCl generation, high torrefaction yield (70-90%), no wastewater, little environmental pollution, high product yield, low production cost, high recovery rate of Al and Fe, high product purity (higher than 99%), simple process and stable oepration.

Description

technical field [0001] The invention belongs to a new process for producing vanadium pentoxide from vanadium-containing stone coal and vanadium slag. Background technique [0002] At present, the production of vanadium pentoxide by using vanadium-containing stone coal, vanadium slag and other raw materials in our country mostly adopts the process of 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 40-45%, and in the process of sodium roasting, 20-25 tons of sodium chloride needs to be added for roasting per ton of product, thus producing a large amount of chlorine and hydrogen chloride gas and discharging a large amount of salt Wastewater seriously pollutes the surrounding environment and destroys the ecological balance. Therefore, in order to protect the environment, many places have shut down the pro...

AI Technical Summary

Problems solved by technology

Although the Jiangxi Coal Industry Science Research Institute used the vanadium-containing slag roasted in a fluidized bed furnace without sodium to conduct a pilot test for the production of vanadium pentoxide, but according to relevant data, a large amount of sulfuric acid was consumed in the production process. 45% of coal produces a lot of waste water

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

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