Process of materials recovery from energy storage devices, wherein the process comprises cleaning, washing, deep discharging and then crushing the devices to recover floating non-magnetic materials and magnetic materials. Further the black mass is treated with baking process, water soaking process, gravity filtration process, leaching process, Cobalt salt recovery process, Manganese salt recovery process, Nickel salt recovery process, Sodium salt recovery process, Lithium salt recovery process and then selective absorption of respective ions using Ion-exchange resin and liquid-liquid extraction using organic solvent for beneficiation to recover pure Cobalt ions, Manganese ions, Nickel ions and Lithium ions. Further the process of the present invention facilitates in recovering all possible battery grade materials from used energy storage devices. The process of the present invention uses less water, energy, economical, safe, environment friendly without generating any hazardous gases while the process has very low carbon foot prints.

A method of collecting anhydrous sodium sulfate from fly ash includes heating a purified sodium sulfate solution to 60 C. to 80 C., and adding a precipitation promoter to the purified sodium sulfate solution to precipitate anhydrous sodium sulfate crystal. The method further includes cooling the purified sodium sulfate solution and the anhydrous sodium sulfate crystal to 35 C. to 55 C. for precipitating more anhydrous sodium sulfate crystal, and collecting and drying the anhydrous sodium sulfate crystal.

A method of collecting anhydrous sodium sulfate from fly ash includes heating a purified sodium sulfate solution to 60 C. to 80 C., and adding a precipitation promoter to the purified sodium sulfate solution to precipitate anhydrous sodium sulfate crystal. The method further includes cooling the purified sodium sulfate solution and the anhydrous sodium sulfate crystal to 35 C. to 55 C. for precipitating more anhydrous sodium sulfate crystal, and collecting and drying the anhydrous sodium sulfate crystal.