The invention belongs to the technical field of
mineral processing and particularly relates to a method for recovering
vanadium by virtue of magnesiation and
roasting of stone
coal. The technical scheme is as follows: decarburizing stone
coal ores, then adding MgSO4, performing fine
grinding until the
granularity is not greater than 100 meshes, performing fluosolid
roasting, and performing water leaching on the roasted sample at a certain temperature, thereby obtaining
vanadium-containing
leachate; leaching the water leaching dregs with sulphuric acid, washing the leaching dregs with water, mixing acid leaching liquor with a washing solution so as to obtain a mixture used for leaching
roasting dregs during water leaching,
drying washed residues, mixing the dried washed residues with the decarburized stone
coal ore, and performing ore
grinding; and performing extraction and
impurity removal on the obtained
vanadium-containing
leachate, then adding an NH4Cl solution for
molybdenum precipitation, and incinerating the precipitate to obtain V2O5. The method is used for
processing stone coal vanadium ore with vanadium content of no less than 0.80%; the
recovery rate of vanadium in the obtained
leachate is no less than 75%. According to the method, less harmful gases are discharged in a roasting process, the
water consumption and the acid consumption are less, the production cost is low, solids and liquids can be recycled, and the application potential is great, so that the method is an economical and effective vanadium
recovery method.