The present disclosure relates to a method for lithium recovery by extraction-stripping separation and purification, including: (1) performing an extraction on a lithium-containing solution using an extraction system including a composite extractant at a pH in a range of 10-13 and separating to obtain a lithium-loaded organic phase; (2) subjecting the lithium-loaded organic phase obtained in step (1) to a gas-liquid-liquid three-phase stripping to obtain a lithium-loaded stripping solution; and (3) subjecting the stripping solution obtained in step (2) to a thermal treatment and separating to obtain a lithium product and a separated mother liquor.

A process and an installation wherein a ternary system including an aqueous acidic solution, an organic solvent not miscible with water and a thermosensitive hydrotropic agent is used to selectively extract tantalum and optionally niobium by cycling extraction between low-temperature single-phase and high temperature two phase regions in the ternary phase prism far from the critical point.

A process and an installation wherein a ternary system including an aqueous acidic solution, an organic solvent not miscible with water and a thermosensitive hydrotropic agent is used to selectively extract tantalum and optionally niobium by cycling extraction between low-temperature single-phase and high temperature two phase regions in the ternary phase prism far from the critical point.

Methods for extracting a target metal from a mixed metal input are described. The method includes milling the mixed metal input with ammonium bicarbonate to form a milled solid product, aging the milled solid product, and leaching the target metal from the aged solid product.

Methods for extracting a target metal from a mixed metal input are described. The method includes milling the mixed metal input with ammonium bicarbonate to form a milled solid product, aging the milled solid product, and leaching the target metal from the aged solid product.

A method for recovering metals from a metal-containing solution containing nickel ions, lithium ions, and anions of an inorganic acid, the method including: a nickel extraction step including extraction that mixes the metal-containing solution with a solvent while adjusting an equilibrium pH using a pH adjusting agent containing lithium ions, transfers the nickel ions in the metal-containing solution to the solvent, and separates the solvent containing the nickel ions from an extracted solution, wherein in the nickel extraction step, the extraction is carried out under conditions where the total of a lithium ion concentration of the metal-containing solution and a lithium ion concentration of the pH adjusting agent is less than or equal to a lithium ion concentration of a saturated solution of a lithium salt made of the anions of the inorganic acid and the lithium ions contained in the metal-containing solution.

The present application discloses a gold recovery system and recovery method thereof from a gold separation solution, where the recovery system includes an gold selective extraction system, a reduction system, a washing system, and an evaporation system; and the recovery method specifically includes the following steps: (1) primary extraction; (2) secondary extraction; (3) gold precipitation by reduction; (4) washing of gold powder; and (5) evaporation of waste solution. In the present application, by using chloride ions to recognize AuCl.sub.4.sup., the gold-rich solution is directly reduced to produce qualified gold powder product (99.995%); the gold-barren solution and the post-reduction solution are evaporated and concentrated, with the condensate reused to realize the recovery and regeneration of chloride ions, the recycling of the extractant and no generation of waste solution or waste gas in the production process.

What is provided is a method for separating cobalt and nickel including: a crushing and sorting step of crushing and classifying the lithium ion secondary battery to obtain an electrode material containing at least cobalt, nickel, copper, and lithium; a leaching step of immersing the electrode material in a processing liquid containing sulfuric acid and hydrogen peroxide to obtain a leachate; a copper separation step of adding a hydrogen sulfide compound to the leachate with stirring and subsequently carrying out solid-liquid separation to obtain an eluate containing cobalt and nickel and a residue containing copper sulfide; and a cobalt/nickel separation step of adding an alkali metal hydroxide to the eluate to adjust a pH and subsequently, adding a hydrogen sulfide compound with stirring and carrying out solid-liquid separation to obtain a precipitate containing cobalt sulfide and nickel sulfide and a residual liquid containing lithium.