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.

An integrated pressure leaching, heap leaching process for recovering copper from sulphidic feed containing iron, arsenic, and copper. Aqueous feed slurry of the sulphidic feed is pressure oxidized to form a liquid phase containing free sulphuric acid and aqueous copper sulphate, and to precipitate arsenic as solid iron arsenic compounds. Treated slurry is withdrawn from the pressure vessel and the liquid phase is separated from the solids. Copper is recovered from the separated liquid phase and generates a solution enriched in acid and depleted in copper. At least a portion of this solution is neutralized in a copper heap leach to produce a PLS containing copper and reduced in acid. At least a portion of the heap leach PLS is neutralized to produce a solution further reduced in acid, and solids containing copper precipitates, followed by a liquid solid separation. The solution further reduced in acid is recycled as process solution for the pressure leach, while the solids containing copper precipitates are recycled to combine with either the treated slurry from the pressure leach, or the liquid phase from liquid solid separation, to re-dissolve copper and other metal values. The solids from the latter step are separated and the liquid phase is fed to copper recovery.

Methods and systems for the extraction of metals from an aqueous feed solution containing the metal ions. The aqueous feed solution is contacted with one side of a hydrophilic membrane support while an organic liquid is contacted with an opposite side of the hydrophilic membrane support. Metal ions migrate from the aqueous feed solution through the membrane support and into the organic liquid. The metal ions may be re-extracted from the organic liquid using a strip solution. The steps of extraction and reextraction may be carried out in a system including two hollow fiber membrane modules that each include a plurality of hydrophilic polymer hollow fibers.

Systems and methods for removing lithium and/or magnesium from an aqueous solution are disclosed. The aqueous solution is extracted using an organic phase composition that comprises a hydroxamic acid, desirably an N-alkyl alkanohydroxamic acid having at least 9 carbon atoms. The extraction is performed at least twice, each time at a different pH. The first extraction is performed at an acidic pH and removes metal ions that otherwise interfere with lithium extraction. The second extraction is performed at a higher pH than the first extraction, and results in captured lithium and/or magnesium, and an aqueous salt solution.

Systems and methods for removing lithium and/or magnesium from an aqueous solution are disclosed. The aqueous solution is extracted using an organic phase composition that comprises a hydroxamic acid, desirably an N-alkyl alkanohydroxamic acid having at least 9 carbon atoms. The extraction is performed at least twice, each time at a different pH. The first extraction is performed at an acidic pH and removes metal ions that otherwise interfere with lithium extraction. The second extraction is performed at a higher pH than the first extraction, and results in captured lithium and/or magnesium, and an aqueous salt solution.

Provided is a method for inhibiting extractant degradation in the DSX process through the metal extraction control, the method comprising steps of: (a) adding limestone to a copper solvent extraction-raffinate to precipitate iron (Fe) and aluminum (Al) as a slurry, recovering a clarifying liquid; and (b) adding sulfuric acid to the recovered clarifying liquid to adjust the pH thereof.

A method for processing positive electrode active material waste of lithium ion secondary batteries, the waste containing cobalt, nickel, manganese and lithium, the method including: a carbon mixing step of mixing the positive electrode active material waste in the form of powder with carbon to obtain a mixture having a ratio of a mass of carbon to a total mass of the positive electrode active material waste and the carbon of from 10% to 30%; a roasting step of roasting the mixture at a temperature of from 600° C. to 800° C. to obtain roasted powder; a dissolution step including a first dissolution process of dissolving lithium in the roasted powder in water or a lithium-containing solution, and a second dissolution process of dissolving the lithium in a residue obtained in the first dissolution process in water; and an acid leaching step of leaching a residue obtained in the lithium dissolution step with an acid.

A method of pretreatment and bromine recovery of PCB Incineration ash is disclosed that relates to the field of comprehensive recovery of valuable metals by full wet method, especially relates to a method of valuable metals and bromine recovery, precious metals enrichment in pretreatment process of PCB Incineration ash. The major steps includes alkali leaching, Cu extraction back-extraction, neutralization-precipitation to separate, Bromine evaporative crystallization, regeneration, acid pickling, Zn evaporative crystallization, removal of Zn and Cu. Compared with the traditional comprehensive recovery process of ash, the invention can separate bromine from ash and recover valuable metals such as copper, zinc and lead with the maximum extent, at the same time, the enrichment of silver and other precious metals is beneficial to the subsequent recovery of precious metals. It has high added recovery value and no tailless discharge.

Disclosed are reagent compositions for metal solvent extraction and methods of preparation and use thereof. In certain embodiments, the disclosure relates to recovering metal values from an aqueous process stream using solvent extraction and employing a mixture of oxime reagents that synergistically improves metal recovery, rate of degradation and/or metal selectivity.

Disclosed are reagent compositions for metal solvent extraction and methods of preparation and use thereof. In certain embodiments, the disclosure relates to recovering metal values from an aqueous process stream using solvent extraction and employing a mixture of oxime reagents that synergistically improves metal recovery, rate of degradation and/or metal selectivity.