Recovery of lithium from low content extracted tail water and recycling method of extracted tail water

摘要

The present invention relates to a method for recovering lithium in low content extracted tail water, and in particular, adding calcium to extracted tail water containing lithium and removing fluorine therefrom, forming crystals by evaporation, removing impurities, and , Recovering the condensed water, precipitating the lithium salt, and recycling the mother liquor. In addition, sodium hydroxide was added to the extraction residue after extraction of cobalt, nickel and manganese, and the pH value was adjusted to 8-13, and a material containing calcium was added to bring the F/Ca ion molar concentration to 1/1-5. To reach, reacted for 0.5-4 hours, filtered, washed, and the filtrate was evaporated; Concentrating the stock solution to 1/4-16 by means of evaporation and concentration to form crystals, so that the content of sodium sulfate in the stock solution and lithium in the concentrate reach 5-30 g/L while recovering the condensed water; A saturated sodium carbonate solution was added to the concentrated solution to precipitate lithium ions as lithium carbonate for recovery.