Recovery of Lithium (Li) Salts from Industrial Effluent of Recycling Plant

Abstract

To cope up with the supply–demand gap of lithium (Li) an essential energy element, the recycling of waste industrial effluent (generated after cobalt recycling from waste Li-ion batteries) is targeted. In industry, after the recovery of Co, Cu, Ni, and graphite from one ton of black cathodic material of Li-ion batteries about 8 m3 of waste effluent containing 5–10 g/L Mn and 1–3 g/L Li is generated. Systematic precipitation studies were carried out using saturated alkaline solution varying Eh/ pH of the effluent. Settling time 30 min and pH ~12 were found to be optimum conditions for maximum precipitation of Li (~90%) as salt. Precipitation studies for Mn/ Li with scientific validation were also carried out and discussed. The process developed has tremendous potential to be commercialized in industry after scale-up studies.