OOIR: Observatory of International Research

Papers

(The H4-Index of Hydrometallurgy is 32. 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 2021-11-01 to 2025-11-01.)

Article	Citations
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	129
Utilization of CO2 as a precipitant to prepare aluminum hydroxide from NaAl(OH)4 solutions: Study on reaction kinetics and mechanism	102
A comparison of batch and semi-batch reactors for leaching battery cathodes (LiCoO2) under controlled addition of HCl and H2O2	83
Green and low-carbon preparation of ammonium paratungstate by adding ammonia to ammonium metatungstate solution	80
Ammonium fluoride roasting and water leaching of leucoxene concentrates to produce a high grade titanium dioxide resource (of the Yaregskoye deposit, Timan, Russia)	78
Ternary extractant system consisting of PC-88A, TOPO, and Versatic 10 for recovery of scandium(III) from nickel laterite processing liquors	67
Research on the migration of rubidium and mineral phase changes during sulfuric acid leaching of biotite	64
Waste reduction and high value utilization of jarosite-alunite residue (JAR) produced from the recovery of spent lithium-ion battery	63
Stepwise recovery of gallium (Ga), lithium (Li), and rare earth elements (REEs) from roasted coal gangue based on leaching kinetics differentiation	60
Kinetics of ultrasound-assisted solvent extraction of vanadium with methyltrioctylammonium chloride (MAC)	59
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	57
A novel method for the separation of niobium and titanium from sulfuric acid-oxalate solutions using N235 and MIBK	51
Continuous recovery of lithium and boron from Jezechake Salt Lake brine using fixed-bed adsorbers	50
A preliminary study of a sequential leaching process to recover Ag, Au, Cu, and Sn from E-waste	47
A leaching, solvent extraction, stripping, precipitation and calcination process for the recovery of MoO3 and NiO from spent hydrofining catalysts	46
Phase evolution and elemental distribution of zinc and germanium during the sulfide roasting, zinc fuming and leaching processes: Benefit of pretreating zinc oxide dust	46
Cesium ion sorption on hybrid pectin-Prussian blue beads: Batch and column studies to remove radioactive cesium from contaminated wastewater	45
Scaling analysis of electrodeposited copper and the influence of a modified polysaccharide on surface roughness	45
Reducing silica in zirconium leachate from washed and dried frit powder: Role of cold and concentrated nitric acid and avoidance of crud formation	43
Cobalt and nickel separation in aqueous two-phase systems with polyethylene glycol 20,000 and sodium electrolytes	42
Recovery of vanadium from direct acid leaching solutions of weathered crust vanadium‐titanium magnetite via solvent extraction with N235	41
Atmospheric acid leaching of powdery Ni-Co-Fe alloy derived from reductive roasting of limonitic laterite ore and recovery of battery grade iron phosphate	40
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	40
Thorium speciation in synthetic anhydrite: Implications for remediation and recovery of thorium from rare-earth mine tailings	39
Moisture absorption rates via capillary suction within packed beds – The effect of material and fluid properties with implications for heap leaching operations	37

Editorial Board	36
Determination of the kinetic parameters of leaching from experimental data using the non-porous shrinking particle model: Effect of error propagation	36
Extraction of chloride from slag flush wastewater using solvent N235	35
Editorial Board	35
Extraction of gold from a gold concentrate using a lixiviant synthesized by a roasting process	34
Study on pre-oxidation of silver concentrate and leaching behaviour of Zn, Cu and In during oxygen-pressure leaching	33
Thermodynamic analysis and application for preparing FePO4 from nitric acid pressure leach laterite residue by selective leaching in phosphoric acid and induced precipitation	32
On the mechanism of the dissolution of gypsum (calcium sulfate dihydrate)	32
Identification of processes in Cu-ore heap leaching using Cu isotopes and leachate chemistry at Tschudi mine, northern Namibia	32