Novel process for preparing vanadic anhydride from firing residue of vanadium-containing stone coal

Abstract

The invention relates to a novel technology for preparing vanadium pentoxide by using stone coal ignited residue containing scherbinaite, which comprises the following steps: the stone coal ignited residue containing scherbinaite is directly filled in a cement leaching tank without being smashed or ball-milled, and then leached by a dilute sodium carbonate solution at normal temperature or by heating at the temperature of 60 DEG C to 100 DEG C; the obtained leach solution is adsorbed by resin and desorbed by saturated sodium chloride; the desorbed solution is dephosphorized and then added with ammonium chloride to precipitate vanadium, so as to obtain ammonium metavanadate, and the ammonium metavanadate is pyrolyzed to obtain the vanadium pentoxide. The invention has the advantages that (1) the nubbly stone coal ignited residue containing the scherbinaite is directly filled in the cement leaching tank for leaching so that the investment of fixed assets is saved and the problem of dust pollution in workshop is solved; (2) energy is saved by utilizing the waste heat of a roasting furnace for heating the leach solution, the leaching speed is quickened, the recovery rate is improved and the grade of vanadium contained in the leach solution is enriched; (3) by adopting the dilute sodium carbonate solution to substitute sulphuric acid for warming leaching, per ton of fine vanadium consumes approximately 2 tons of sodium carbonate only, therefore, production cost is saved compared with leaching per ton by sulphuric acid; (4) the water used for working can be recycled, thus realizing zero release; the leach residue is slightly alkaline and meets the national placement standards of general wastes.

Description

technical field [0001] The invention relates to the rare non-ferrous metal hydrometallurgy industry, in particular to a new process for preparing vanadium pentoxide by leaching vanadium-containing stone coal slag with dilute soda ash solution. Background technique [0002] For the extraction of vanadium pentoxide from the slag of vanadium-containing stone coal calcification roasting or blank oxidation roasting, the existing processes are generally dilute sulfuric acid normal temperature heap leaching or tank leaching and stirring leaching recovery process at normal temperature. These processes use dilute sulfuric acid leaching , poor selectivity, large consumption of sulfuric acid, high impurity content in the leaching solution, need to adjust alkali, resin ion exchange or solvent extraction PH value needs to be adjusted to 2-2.5, high production cost; leaching solution and tail water are acidic and contain A large number of heavy metal ions have certain environmental hazard...

AI Technical Summary

Problems solved by technology

[0002] For the extraction of vanadium pentoxide from the slag of vanadium-containing stone coal calcification roasting or blank oxidation roasting, the existing processes are generally dilute sulfuric acid normal temperature heap leaching or tank leaching and stirring leaching recovery process at normal temperature. These processes use dilute sulfuric acid leaching , poor selectivity, large consumption of sulfuric acid, high impurity content in the leaching solution, need to adjust alkali, resin ion exchange or solvent extraction PH value needs to be adjusted to 2-2.5, high production cost; leaching solution and tail water are acidic and contain A large number of heavy metal ions have certain environmental hazards