Research on Separation and Extraction of Valuable Metals from Complex Non-ferrous Metals Resources by High Pressure Oxygen Leaching Methodology: A Review

Colloid-chemical properties of surfactant–nitric acid–water systems

“…At the initial stage of this study, preliminary testing of a number of surfactants from the class of dispersants, stabilizers, and foaming agents (at least 10) was carried out for their compatibility with nitric acid. To do this, a drop of concentrated nitric acid was applied onto a glass substrate, and a drop of an aqueous surfactant solution with a surfactant concentration of 1.28 g/dm 3 was placed on its surface.…”

“…The ready solution was filtered on a Millipore filter with pore diameters of ≤0.45 µm. From the resulting solution, a series of solutions with Csurf 0.002-1.280 g/dm 3 were prepared by dilution. Solutions with a HNO3 concentration of 0.1-10 g/dm 3 were prepared by introducing a calculated amount of concentrated acid, taking into account the total volume of the solution.…”

“…However, to date, rich and easy-to-dress deposits of nonferrous metal ores have been almost exhausted. The processing now involves difficult-to-dress ores, and finely dispersed, technogenic raw materials with a low content of valuable components [3]. Double and triple hard-to-process ores are especially important.…”

Built-in anionic equilibrium for atom-economic recycling of spent lithium-ion batteries

“…The industrial-scale application of the proposed recycling technology for sLFP could be foreseeable, considering that the pressure leaching has been widely used in the hydrometallurgy processes of non-ferrous metals resources. 54,55 Therefore, the scaled-up autoclave can be directly applied for recycling sLFP, especially under the condition of low acid concentration. The universality of the proposed built-in anionic equilibrium recycling strategy toward spent LiCoO 2 and LiNi x Co y Mn z O 2 (x + y + z = 1) was also explored preliminarily.…”

Synthesis and Phase Behavior of a Platform of CO2-Soluble Functional Gradient Copolymers Bearing Metal-Complexing Units

“…These approaches are highly energy-demanding, expensive, chemically dangerous, and environmentally unfavorable. As a consequence, novel methods to remove metals from industrial and urban wastes are desirable [18][19][20][21][22][23][24][25][26][27]. So far, different methods have shown interesting results: processing of metals using ionic liquids [28][29][30][31], removal of metals using polyphosphonates [32], metal recovery with ion exchange resins [33][34][35][36][37] or solvent extraction [38][39][40][41][42][43] already exhibited good extraction abilities, but in most cases, acidic aqueous solutions or waste pretreatments are necessary to reach the goal.…”