METHOD FOR PROCESSING OF VANADIUM-CONTAINING SLAGS Russian patent published in 2005 - IPC

FIELD: hydrometallurgy, in particular, reprocessing of vanadium-containing slag, may be used for extraction of vanadium and manganese from other vanadium-containing materials.

SUBSTANCE: method involves providing oxidizing roasting without adding of reaction admixtures; leaching calcine with the use of aqueous soda solution for producing of solid residue and solution; processing solution with monobasic alcohol used in an amount of 25-30% by volume and settling with following obtaining of two phases: lower phase exposed to separation, washing and drying processes for obtaining of ready product in the form of sodium vanadates, and upper phase in the form of aqueous alcoholic-soda solution, which is subjected to alcohol distillation process and, thereafter, corrected and returned to calcine leaching stage, while alcohol is returned to the stage of extracting vanadium from soda solution; leaching residual substance remained after soda leaching and containing manganese and residual vanadium by means of aqueous solution of sulfuric acid with pH value of solution being not in the excess of 1.95; subjecting resultant manganese-containing solution to two-staged purifying process for removal of contaminants by settling procedure provided with the use of lime mortar, first stage being provided at pH value of 1.90-1.95 with resulting formation of CaSO₄ (gypsum) and second stage being provided at pH value of 7.0 with resulting formation of sediment, which is directed to soda leaching stage for additional extraction of vanadium; directing manganese-containing solution for processing with the use of known processes for producing of commercial manganese dioxide.

EFFECT: increased extent of extracting vanadium and manganese, provision for obtaining of high-quality additional commercial product, and practically totally closed slag processing cycle.

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