Extraction and purification of gold from raw acidic electronic leachate using an aqueous biphasic system

Alternative Extraction Systems for Precious Metals Recovery: Aqueous Biphasic Systems, Ionic Liquids, Deep Eutectic Solvents

“…A method of gold extraction from scrap central processing units with an ABS based on L64 triblock copolymer, lithium sulfate, and matrix ions of the leachate solutions has been proposed [27]. Gold is quantitatively extracted in the macromolecular-rich top phase without the use of any auxiliary extractants; copper is extracted as a by-product.…”

Simple Gold Recovery from E-Waste Leachate by Selective Precipitation Using a Quaternary Ammonium Salt

“…Two successive leaching steps were performed to selectively strip metals from the waste PCB following a previously described protocol. [27] First the shredded waste was leached using 5.0 mol/L nitric acid with a solid to liquid ratio (S/L) of 1:20, at 70 • C for 2 h. Then the residue was dried for 4 h at 100 • C before the second leaching step, using concentrated aqua regia in a 1.5:20 S/L ratio, first at 60 • C for 30 min, then 70 • C for another 30 min and finally 80 • C for the remaining 60 min of leaching.…”

“…To this end, two successive leaching stages were performed to selectively strip metals from waste CPU (Mobile AMD® Sempron™ 3000 + series) following a previously described protocol. [27] The process is summarised in Fig. 4A and the composition of the first and second leachate using 5.0 mol L -1 HNO 3 and concentrated aqua regia respectively is given in Fig.…”

Extraction of some essential amino acids using aqueous two-phase systems made by sugar-based deep eutectic solvents

“…These systems have been used for many years in biotechnological applications such as the separation of amino acids, enzymes, proteins, etc. 2–4…”

“…These systems have been used for many years in biotechnological applications such as the separation of amino acids, enzymes, proteins, etc. [2][3][4] Recently, ATPSs based on deep eutectic solvents (DESs) [5][6][7][8] have been created to extraction of biomolecules. This innovation brings forth several distinctive features that enhance the partitioning process of amino acids.…”