method for recovery of germanium and other metals from flugaschen of a power plant with integrated coal gasification and the type of combined cycle (igcc)

摘要

The fly ash is leached with water or an aqueous acid or base, and germanium is recovered from the separated liquid phase. A method for recovering germanium from fly ash generated by integrated gasification combined cycle-type (IGCC) furnaces involves: (a) leaching the fly ash with an extraction agent chosen from water, an aqueous acid solution or an aqueous base solution, to dissolve some or all of the germanium present; (b) separating the solution or suspension from step (a) into a solid phase and a germanium-containing liquid phase; and (c) recovering germanium from the liquid phase. Independent claims are also included for; (1) A method for recovering gallium and/or vanadium from the solid phase from step (b) of the above process, by leaching the solid phase with an aqueous base solution, separating the resulting suspension into a solid phase and a gallium and/or vanadium-containing liquid phase, and recovering the gallium and/or vanadium from the liquid phase, and (2) A method for recovering nickel from the solid phase from step (b) of the above process, by leaching the solid phase with an aqueous acid solution, separating the resulting suspension into a solid phase and a nickel-containing liquid phase, and recovering the nickel from the liquid phase.