Patent ID: 6503473
Filing Date: 2003-01-07
Classification: C01B

Abstract:
A process comprising(1) bubbling gaseous hydrogen sulfide through an aprotic solvent containing solid lithium hydroxide and a solid compound other than lithium hydroxide (hereinafter â€œnon-lithium hydroxide solid compoundâ€ ) to convert substantially all lithium hydroxide into a lithium hydrosulfide soluble in the aprotic solvent at a pressure of 0.1 MPa to 0.2 MPa, (2) separating the non-lithium hydroxide solid compound by solid-liquid separation in the form of a crystal cake at a temperature from 70Â° to 100Â° C., and (3) washing the crystal cake with the aprotic solvent to recover lithium hydrosulfide contained in the crystal cake at a temperature from 50Â° to 120Â° C., wherein lithium is recovered at a lithium-recovering rate of over 85%.