The invention provides a method for gas-phase
vanadium extraction by utilizing
combustion of stone coals in
cyclone furnace. After stone coals are crushed, fuels are added, and ground to
powder, and the additive fuels weigh 5%-15% of the stone
coal raw material. The
powder and air with an
oxygen content of 21%-30% are sent to a
cyclone furnace, gas-state
vanadium pentoxide is generated and discharged along with furnace gas, formed ash
slag adheres to a cylinder wall and forms liquid-state ash membranes, which are discharged through a kettle opening. Furnace gas is mixed with cool air, cooled, dedusted by cyclones and enriched in an electrostatic fabric filter. The enrichment objects are soaked by an alkali solution to obtain a
vanadium-containing soaking solution. The dust in the furnace gas is sent to a secondary
spray tower, and the gas-state vanadium
pentoxide is dissolved in a vanadium-containing spray solution.
Sulfuric acid or
hydrochloric acid are added to the two vanadium-containing solutions, and vanadium
pentoxide crude products are precipitated through acid
neutralization. The temperature in the furnace is high, and low-valence-state vanadium can be oxidized and gasified fully. The
cyclone furnace has high
slag-capturing rate, and the burden of dedusting devices is light. The
powder in the furnace is thrown onto
slag membranes, the resistance time is long, and the continuity and sufficiency of
combustion can be maintained.