FE-CR REDOX FLOW BATTERY SYSTEMS AND METHODS FOR PREPARATION OF CHROMIUM-CONTAINING ELECTROLYTE THEREFOR

A method for preparation of electrolyte for a redox flow battery includes reducing chromium ore using a carbon source to convert the chromium ore to an iron/chromium alloy with carbon particles; dissolving the iron/chromium alloy with carbon particles in sulfuric acid to form a first solution; adding calcium chloride or barium chloride to the first solution to produce a second solution including FeCland CrCl; and adding an acid to the second solution to form the electrolyte. Other methods can be used for preparing an electrolyte from chromium waste material.