New Insights into the Recovery of Strategic and Critical Metals by Solvent Extraction

Abstract

1. INTRODUCTION 2. EXTRACTANT DESIGN 2.1. THE ROLE OF COORDINATION CHEMISTRY AND SUPRAMOLECULAR CHEMISTRY ON THE DESIGN OF NEW EXTRACTANTS 2.1.1. COMPLEX FORMATION 2.1.2. ION PAIRS AND METALATES 2.1.3. REVERSE MICELLES 2.1.4. CONCLUSION 2.2. THE ROLE OF PHYSICOCHEMISTRY FOR A RATIONAL DESIGN OF NEW EXTRACTANTS 2.3. CASE STUDIES 2.3.1. DESIGN OF NEW EXTRACTANTS FOR URANIUM RECOVERY FROM WET PHOSPHORIC ACID 2.3.2. CHEMICAL DESIGN IN GOLD RECOVERY BY URBAN MINING 3. FLOWSHEET OPTIMIZATION 3.1. EFFECT OF FLOWRATES ON FLOWSHEET PERFORMANCES 3.2. INFLUENCE OF DEGRADATION ON FLOWSHEET PERFORMANCE 3.3. COMBINING CHEMISTRY AND ENGINEERING FOR FLOWHEET OPTIMIZATION 3.4. PERSPECTIVE IN THE DEVELOPMENT OF TOOLS FOR FLOWSHEET OPTIMIZATION 4. CONCLUSION 5. REFERENCES

Challenges and opportunities in the recovery of gold from electronic waste

“…In conventional mining, hydrometallurgy is more suited to recovering metals from lower grade, mixed-metal ores than can traditionally be handled by pyrometallurgical routes. 48,49 However, challenges arise from the complexity of the feed stream, the need for strong acids in leaching processes, and the need to minimise the losses of the organic solvents and chemical reagents during the separation processes.…”

Simple Amides and Amines for the Synergistic Recovery of Rhodium from Hydrochloric Acid by Solvent Extraction

“…Given that the organic phase solubility of amine L A is significantly enhanced in the presence of rhodium, a reversemicelle mechanism for rhodium extraction was initially considered. [16] The water content in the synergistic organic phases after contact with aqueous acid or an acidic rhodium solution was determined by Karl-Fischer titrations, and shows that in the absence of rhodium more water is transported into the organic phase (Figure S5). This is also the case when the concentration of one extractant is held constant and the concentration of the other extractant is increased (Figures S6 and S7), with a steeper increase in the water content in the absence of rhodium.…”

Tantalum Recycling by Solvent Extraction: Chloride Is Better than Fluoride

“…As such, it is evident that there is a need to develop more sustainable processes which can not only efficiently recycle tantalum from secondary sources but do so using milder reagents [12][13][14][15].…”

“…[8][9][10][11]. As such, it is evident that there is a need to develop more sustainable processes which can not only efficiently recycle tantalum from secondary sources but do so using milder reagents [12][13][14][15]. Recent efforts towards fluoride-free tantalum recovery processes have focused on alkaline matrices to generate polyoxotantalates that are recovered at elevated temperatures by solvent extraction [16][17][18].…”