Method and device for pre-enriching vanadium in downstream stone coal

The invention belongs to the technical field of stone coal preenrichment and relates to a method and device for pre-enriching vanadium in downstream stone coal. The method comprises the following steps: crushing and roughly grinding stone coal material and adding to a stone coal roasting device so as to remove carbon substances, As and S at a fluidized state; under the driving of gas flow, discharging coarse particles from different spigots of a cyclone separator and returning to a fluidized bed for circular roasting; under the action of gas flow, bringing fine particles with carbon substances, As and S completely removed into a bag type collector for collection, thus reaching the purpose of vanadium preenrichment. According to the method, roasted stone coal is separated in a downstream gas flow mode in a transportation process; since the particles are circularly roasted, the carbon substances, As, S and other elements in the particles can be removed completely; flue gas is recycled and treated by a flue gas treatment device; vanadium in stone coal is enriched. The process flow is simple in structure and high in adaptability, and is capable of thoroughly removing carbon substances, As and S out of stone coal; due to arrangement of downstream gas flow, the energy consumption is low, dust is hardly generated, and the preenrichment effect for vanadium is good; and therefore a convenient condition is provided for extraction of vanadium from stone coal ores in the subsequent flow.