OOIR: Observatory of International Research

Papers

(The H4-Index of Hydrometallurgy is 31. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2022-06-01 to 2026-06-01.)

Article	Citations
Cesium ion sorption on hybrid pectin-Prussian blue beads: Batch and column studies to remove radioactive cesium from contaminated wastewater	167
Waste reduction and high value utilization of jarosite-alunite residue (JAR) produced from the recovery of spent lithium-ion battery	106
Lipophilic EDTA-based ligands in different diluents for the extraction of rare earths: Preliminary results with Nd(III), Dy(III) and Pr(III) in chloride and nitrate media	105
Impurity incorporation and selective removal in NiSO₄•6H₂O crystals: Mechanistic insights for battery-grade purification	79
A leaching, solvent extraction, stripping, precipitation and calcination process for the recovery of MoO3 and NiO from spent hydrofining catalysts	63
A comparison of batch and semi-batch reactors for leaching battery cathodes (LiCoO2) under controlled addition of HCl and H2O2	62
Utilization of CO2 as a precipitant to prepare aluminum hydroxide from NaAl(OH)4 solutions: Study on reaction kinetics and mechanism	59
Editorial Board	59
Phase evolution and elemental distribution of zinc and germanium during the sulfide roasting, zinc fuming and leaching processes: Benefit of pretreating zinc oxide dust	59
Research on the migration of rubidium and mineral phase changes during sulfuric acid leaching of biotite	57
Ternary extractant system consisting of PC-88A, TOPO, and Versatic 10 for recovery of scandium(III) from nickel laterite processing liquors	51
A preliminary study of a sequential leaching process to recover Ag, Au, Cu, and Sn from E-waste	50
Green and low-carbon preparation of ammonium paratungstate by adding ammonia to ammonium metatungstate solution	49
Recovery of rare earths, lithium and fluorine from rare earth molten salt electrolytic slag by selective acid leaching‑sodium aluminate roasting conversion	46
Rare earth elements in the Ganges-Brahmaputra-Meghna Delta in Bangladesh: A review of their distribution, extraction and pathways for green processing	46
Recovery process of rare earths, Al, U, and Th from ionic rare earth purification residue using sequential alkaline leaching, acid leaching solvent extraction and stripping	45
Continuous recovery of lithium and boron from Jezechake Salt Lake brine using fixed-bed adsorbers	40
Kinetics of ultrasound-assisted solvent extraction of vanadium with methyltrioctylammonium chloride (MAC)	39
Stepwise recovery of gallium (Ga), lithium (Li), and rare earth elements (REEs) from roasted coal gangue based on leaching kinetics differentiation	38
Scaling analysis of electrodeposited copper and the influence of a modified polysaccharide on surface roughness	38
Study on pre-oxidation of silver concentrate and leaching behaviour of Zn, Cu and In during oxygen-pressure leaching	37
Reducing silica in zirconium leachate from washed and dried frit powder: Role of cold and concentrated nitric acid and avoidance of crud formation	36
On the mechanism of the dissolution of gypsum (calcium sulfate dihydrate)	35
Cobalt and nickel separation in aqueous two-phase systems with polyethylene glycol 20,000 and sodium electrolytes	35
Editorial Board	34

Thorium speciation in synthetic anhydrite: Implications for remediation and recovery of thorium from rare-earth mine tailings	33
Determination of the kinetic parameters of leaching from experimental data using the non-porous shrinking particle model: Effect of error propagation	33
Moisture absorption rates via capillary suction within packed beds – The effect of material and fluid properties with implications for heap leaching operations	33
Recovery of vanadium from direct acid leaching solutions of weathered crust vanadium‐titanium magnetite via solvent extraction with N235	32
Atmospheric acid leaching of powdery Ni-Co-Fe alloy derived from reductive roasting of limonitic laterite ore and recovery of battery grade iron phosphate	32
A magnetic adsorbent with metal-organic framework based on ammonium phosphomolybdenum heteropoly tungstate (AWP): Selective adsorption of Rb+ and Cs+ from aqueous resources and stripping with ammonium	31
Thermodynamic analysis and application for preparing FePO4 from nitric acid pressure leach laterite residue by selective leaching in phosphoric acid and induced precipitation	31
Extraction of chloride from slag flush wastewater using solvent N235	31